{"gene":"AJUBA","run_date":"2026-06-09T22:02:43","timeline":{"discoveries":[{"year":2003,"finding":"Ajuba is an activator of Aurora-A kinase required for mitotic commitment: Ajuba and Aurora-A interact in mitotic cells and become phosphorylated; in vitro, Ajuba induces autophosphorylation and consequent activation of Aurora-A. Depletion of Ajuba prevented Aurora-A activation at centrosomes in late G2 phase and inhibited mitotic entry.","method":"Yeast two-hybrid screen (binding partner identification), co-immunoprecipitation, in vitro kinase assay, RNA interference in synchronized HeLa cells","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro kinase assay plus RNAi phenotype with defined molecular readout; replicated conceptually by multiple subsequent studies","pmids":["13678582"],"is_preprint":false},{"year":1999,"finding":"Ajuba specifically associates with Grb2 through its N-terminal proline-rich pre-LIM domain interacting with either SH3 domain of Grb2; Ajuba augments MAP kinase activity in fibroblasts and promotes Xenopus oocyte meiotic maturation in a Grb2- and Ras-dependent manner.","method":"In vitro binding assay, co-immunoprecipitation in vivo, MAP kinase activity assay, Xenopus oocyte meiotic maturation assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro and in vivo binding demonstrated, enzymatic activity measured, functional rescue in oocyte model with genetic epistasis (Grb2/Ras dependence)","pmids":["10330178"],"is_preprint":false},{"year":2000,"finding":"Ajuba contains a functional nuclear export signal and shuttles into the nucleus; accumulation of Ajuba LIM domains in the nucleus of P19 embryonal cells causes growth inhibition and spontaneous endodermal differentiation. The differentiating effect maps to LIM domain 3, proliferation regulation to LIM domains 1 and 2. Ajuba-induced differentiation requires c-Jun kinase activation.","method":"Nuclear export signal mutagenesis, nuclear accumulation assay, cell proliferation and differentiation assays in P19 cells, c-Jun kinase activity assay","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain mapping by truncation constructs plus functional readouts; single lab, multiple orthogonal assays","pmids":["11029037"],"is_preprint":false},{"year":2002,"finding":"Ajuba is recruited to cadherin-dependent cell-cell adhesive complexes in a regulated manner; Ajuba interacts with α-catenin at adherens junctions, α-catenin is required for efficient Ajuba recruitment to junctions, and Ajuba interacts directly with F-actin. Keratinocytes from Ajuba null mice show abnormal cell-cell junction formation and/or stability.","method":"Co-immunoprecipitation, immunofluorescence localization, knockout mouse keratinocytes, F-actin binding assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, null-mouse phenotype, direct actin binding assay; multiple orthogonal methods in one study","pmids":["12417594"],"is_preprint":false},{"year":2002,"finding":"Ajuba interacts with the amino terminus of the glial glutamate transporter GLT-1; Ajuba is coimmunoprecipitated with GLT-1 from brain and co-localizes with GLT-1 at the plasma membrane when co-expressed. Ajuba co-expression did not affect GLT-1 Km or Vmax for glutamate.","method":"Co-immunoprecipitation from brain tissue, co-expression in COS cells with co-localization","journal":"Molecular and cellular neurosciences","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — reciprocal co-IP from native brain tissue plus co-localization; functional effect on transporter was negative","pmids":["11860269"],"is_preprint":false},{"year":2005,"finding":"Ajuba promotes cell migration by localizing p130Cas to nascent focal complexes: Ajuba associates with the focal adhesion-targeting domain of p130Cas and is required for tyrosine phosphorylation of FAK, p130Cas, Crk, and Dock180 at nascent focal complexes. Rac activation is blunted in Ajuba null cells; Ajuba acts upstream of p130Cas for Rac activation.","method":"Ajuba null mouse embryonic fibroblast migration assay, co-immunoprecipitation, FRET-based Rac activation assay, rescue experiments","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — null-cell phenotype with defined biochemical pathway, FRET Rac activation, rescue experiments; multiple orthogonal methods","pmids":["15728191"],"is_preprint":false},{"year":2005,"finding":"Ajuba regulates cellular PI(4,5)P2 levels by interacting with and activating PIPKIα (PI(4)P 5-kinase) activity while inhibiting PIPKIIβ. In Ajuba-null MEFs, PI(4,5)P2 levels are decreased with a corresponding increase in PI(4)P. Localization of PI(4,5)P2 synthesis to lamellipodia in migrating cells requires Ajuba.","method":"In vitro PIPKIα enzymatic activity assay with recombinant Ajuba, lipid phosphoinositide quantification in Ajuba-null MEFs, immunofluorescence localization","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro enzyme activation assay plus null-cell phenotypic confirmation; two orthogonal methods","pmids":["15870270"],"is_preprint":false},{"year":2005,"finding":"Ajuba modulates IL-1-induced NF-κB activation by influencing the assembly and activity of the PKCζ/p62/TRAF6 signaling complex: Ajuba interacts with p62, TRAF6, and PKCζ; recruits TRAF6 to p62; activates PKCζ in vitro; and is a PKCζ substrate. Ajuba null MEFs are defective in NF-κB activation and IKK activity following IL-1 stimulation.","method":"Yeast two-hybrid screen, co-immunoprecipitation, in vitro PKCζ kinase assay, Ajuba null mouse embryonic fibroblasts NF-κB reporter assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro kinase assay, null-cell epistasis, multiple binding partners confirmed by co-IP","pmids":["15870274"],"is_preprint":false},{"year":2006,"finding":"Ajuba forms a complex with LATS2 during mitosis; LATS2 contributes to mitotic phosphorylation of Ajuba. Depletion of either LATS2 or Ajuba impairs centrosomal accumulation of γ-tubulin and spindle formation at the onset of mitosis.","method":"Yeast two-hybrid screening, co-immunoprecipitation, RNAi depletion, immunofluorescence of γ-tubulin at centrosomes","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid plus co-IP plus RNAi phenotype; single lab","pmids":["16413547"],"is_preprint":false},{"year":2007,"finding":"Ajuba functions as a corepressor for SNAG domain-containing transcription factors (Snail, Gfi1): Ajuba interacts with the SNAG domain in vitro and in vivo, co-localizes with it, and enhances SNAG-mediated transcriptional repression. Chromatin immunoprecipitation shows SNAG-dependent assembly of a multiprotein repression complex including Ajuba at target promoters with histone modifications consistent with repression.","method":"Yeast two-hybrid, co-immunoprecipitation, integrated reporter gene assay, chromatin immunoprecipitation (ChIP), nucleocytoplasmic shuttling assay","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro and in vivo binding, ChIP at endogenous target genes, reporter assay; multiple orthogonal methods","pmids":["17909014"],"is_preprint":false},{"year":2007,"finding":"Ajuba negatively regulates Wnt signaling by promoting GSK-3β-mediated phosphorylation of β-catenin: enforced Ajuba expression destabilizes β-catenin and suppresses Wnt target gene expression; Ajuba reinforces the association between β-catenin and GSK-3β. Wnt stimulation induces β-catenin accumulation and destabilization of Ajuba.","method":"Overexpression and knockdown in cells, co-immunoprecipitation, Western blot for β-catenin stability, luciferase reporter assay for Wnt target genes","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP of β-catenin–GSK-3β complex reinforcement, functional reporter assays; single lab","pmids":["17621269"],"is_preprint":false},{"year":2008,"finding":"Ajuba recruits PRMT5 to the SNAIL/AJUBA corepressor complex at the E-cadherin promoter: PRMT5 binds the non-LIM region of Ajuba, is translocated into the nucleus in a SNAIL- and AJUBA-dependent manner, and the ternary SNAIL/AJUBA/PRMT5 complex mediates arginine methylation of histones at the E-cadherin locus causing its repression.","method":"Co-immunoprecipitation, ChIP at E-cadherin promoter, histone arginine methylation assay, RNAi depletion, luciferase reporter assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — ChIP with histone methylation readout at endogenous locus, ternary complex co-IP, nuclear translocation dependence; multiple orthogonal methods","pmids":["18347060"],"is_preprint":false},{"year":2008,"finding":"Ajuba forms an endogenous complex with Gfi1 and HDAC and functions as a corepressor for Gfi1 autoregulation in a histone deacetylase-dependent manner: active HDAC activity co-immunoprecipitates with Ajuba or Gfi1; Ajuba LIM domains directly bind Gfi1; ChIP and reciprocal knockdown show selective Ajuba co-repressor function at Gfi1 target genes.","method":"Co-immunoprecipitation, gel filtration, HDAC activity assay, ChIP, reciprocal knockdown, reporter assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct binding, HDAC activity assay, ChIP at endogenous genes, epistasis by reciprocal knockdown; multiple orthogonal methods","pmids":["18805794"],"is_preprint":false},{"year":2009,"finding":"Ajuba localizes to centrosomes and kinetochores during mitosis in a microtubule-dependent manner; Ajuba binds microtubules in vitro and follows nascent microtubules from centrosomes to kinetochores. Ajuba interacts with Aurora B and BUBR1 at kinetochores; BUBR1 siRNA disrupts chromosome alignment and modifies Ajuba localization due to premature mitotic exit.","method":"Immunofluorescence during mitosis, in vitro microtubule binding assay, microtubule regrowth assay, co-immunoprecipitation with Aurora B and BUBR1, siRNA knockdown","journal":"Biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro microtubule binding, co-IP of Aurora B and BUBR1, siRNA phenotype; single lab","pmids":["18710370"],"is_preprint":false},{"year":2010,"finding":"Ajuba LIM proteins (Ajuba, LIMD1, WTIP) are negative regulators of the Hippo pathway: in Drosophila, the single ortholog djub is required for normal epithelial organ size; epistasis places djub downstream of hpo. In mammalian and Drosophila cells, Ajuba LIM proteins/dJub interact with LATS/Warts and WW45/Sav to inhibit phosphorylation of YAP/Yki.","method":"Drosophila genetic knockout and RNAi, epistasis analysis (double mutant), co-immunoprecipitation in mammalian and Drosophila cells, YAP/Yki phosphorylation assay","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis in vivo plus co-IP in two species plus kinase substrate assay; independently replicated in subsequent studies","pmids":["20303269"],"is_preprint":false},{"year":2010,"finding":"Ajuba LIM proteins (LIMD1, Ajuba, WTIP) are required for miRNA-mediated but not siRNA-mediated gene silencing; they localize to P-bodies and bind Ago1/2, RCK, Dcp2, and eIF4E in vivo; they also bind the mRNA 5' m7GTP cap-protein complex, and their interaction with eIF4E prevents 4EBP1 and eIF4G interaction.","method":"Co-immunoprecipitation with Ago1/2, RCK, Dcp2, eIF4E; m7GTP cap pull-down; RNAi knockdown with miRNA reporter assay; P-body localization by immunofluorescence","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple co-IPs with distinct partners, cap pull-down, functional miRNA silencing assay; single lab","pmids":["20616046"],"is_preprint":false},{"year":2010,"finding":"Ajuba functions as a nuclear receptor corepressor for a subset of nuclear hormone receptors: Ajuba selectively interacts with RARs and RXRs in a ligand-dependent manner through CoRNR-like motifs; simultaneous mutation of these motifs abolishes RAR binding and repression; Ajuba occupies RARE control elements in the absence of atRA and dissociates upon atRA stimulation; PRMT5 binding to Ajuba is mutually exclusive with RAR binding.","method":"Co-immunoprecipitation (ligand-dependent), mutagenesis of nuclear receptor interacting motifs, ChIP at endogenous RAR target genes, RARE reporter assay, RNAi depletion in P19 cells","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — binding domain mutagenesis, ChIP at endogenous loci, functional reporter, depletion phenotype; multiple orthogonal methods","pmids":["20133701"],"is_preprint":false},{"year":2011,"finding":"In Drosophila neuroblasts, Jub (Ajuba ortholog) is required to maintain Aurora-A at the centrosome but does not activate Aurora-A kinase activity itself; in jub mutants Aurora-A activity is unperturbed but Aurora-A recruitment/maintenance at the centrosome is lost, displacing active kinase from centrosomes and causing spindle defects.","method":"Drosophila jub genetic mutant analysis, immunofluorescence of Aurora-A localization and activity (phospho-T295), mitotic spindle phenotype quantification","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic null allele with specific molecular readout; single lab, partially contradicts earlier activation model","pmids":["21402878"],"is_preprint":false},{"year":2011,"finding":"Ajuba is required for Rac activation and maintenance of E-cadherin adhesion at cell junctions: Rac activation and actin accumulation at cadherin receptors is impaired in Ajuba-depleted cells. PAK1 directly phosphorylates Ajuba at Thr172; phosphomimetic Ajuba rescues PAK1-inhibition-induced junction defects. Ajuba binds Rac·GDP and Rac·GTP, with phosphorylated Ajuba preferentially interacting with active Rac; Ajuba modulates Rac dynamics at contacts. A Rac-PAK1-Ajuba feedback loop operates at cell-cell contacts.","method":"RNAi depletion, in vitro PAK1 kinase assay on Ajuba, phosphomimetic mutant rescue, Rac-GTP pull-down, live imaging of Rac dynamics at junctions","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro kinase assay identifying phosphorylation site, phosphomimetic rescue, pull-down with GTPase; multiple orthogonal methods","pmids":["22105346"],"is_preprint":false},{"year":2012,"finding":"Ajuba binds Isl1 transcription factor and represses its transcriptional activity, is required for RA-dependent autorepression of Isl1 expression in the second heart field, and links retinoic acid signaling to Isl1 to restrict cardiac progenitor cell expansion in zebrafish.","method":"Co-immunoprecipitation (Ajuba-Isl1), transcriptional reporter assay, Ajuba morpholino knockdown in zebrafish, in situ hybridization of cardiac progenitor markers, RA signaling pathway epistasis","journal":"Developmental cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP binding, reporter assay, morphant phenotype with epistasis; single lab","pmids":["22771034"],"is_preprint":false},{"year":2013,"finding":"EGFR-RAS-MAPK signaling promotes phosphorylation of Ajuba family proteins and enhances their binding to Warts/LATS and Salvador/WW45, linking EGFR signaling to Hippo pathway inhibition through Ajuba. In Drosophila, Jub is epistatic to EGFR and Ras for Yorkie regulation.","method":"Genetic epistasis in Drosophila (EGFR/Ras/jub double mutants), co-immunoprecipitation (MAPK-promoted binding), MAPK-dependent phosphorylation assay of Ajuba family proteins in mammalian cells","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis in vivo, biochemical binding enhancement by kinase, conserved in two species; multiple orthogonal methods","pmids":["23484853"],"is_preprint":false},{"year":2013,"finding":"JNK promotes phosphorylation of Ajuba family proteins and promotes binding of LIMD1 or WTIP to LATS1, linking JNK to Hippo pathway inhibition; in Drosophila, Jub is required for JNK-mediated Yorkie activation and wing regeneration after wounding. JNK promotes binding of LIMD1 and LATS1 through direct phosphorylation of LIMD1.","method":"Genetic epistasis in Drosophila (jub requirement for JNK-Yki axis), biochemical binding assay (co-immunoprecipitation with LATS1), in vitro JNK phosphorylation of LIMD1","journal":"Science signaling","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro kinase assay, co-IP binding assay, in vivo genetic epistasis; multiple orthogonal methods in two species","pmids":["24023255"],"is_preprint":false},{"year":2013,"finding":"AJUBA suppresses YAP activity in malignant mesothelioma through LATS2: AJUBA transduction into MM cells suppresses YAP-target gene promoter activities, and this suppression is canceled by LATS2 knockdown, establishing AJUBA as a LATS2-dependent inhibitor of YAP in this cancer context.","method":"Lentiviral AJUBA transduction, promoter-reporter assay, siRNA knockdown of LATS2, YAP phosphorylation Western blot","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis by LATS2 siRNA rescue, functional reporter assay; single lab","pmids":["24336325"],"is_preprint":false},{"year":2013,"finding":"Ajuba associates with the RPA complex and depletion of Ajuba leads to RPA phosphorylation, increased Chk1 phosphorylation, p53 induction, cell cycle delays, and cell death, placing Ajuba as a repressor of unscheduled ATR-mediated DNA damage response.","method":"Co-immunoprecipitation with RPA, RNAi depletion, Western blot for Chk1 and RPA phosphorylation, cell cycle analysis","journal":"Frontiers in genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP with RPA and pathway readouts upon depletion; single lab","pmids":["23755068"],"is_preprint":false},{"year":2014,"finding":"Increasing cytoskeletal tension promotes Drosophila wing growth via a mechanism involving Ajuba (Jub)-dependent inhibition of Warts kinase: Jub associates with α-catenin at adherens junctions, and this association is promoted by cytoskeletal tension; Jub recruits Warts to junctions in a tension-dependent manner; genetic dependence on Jub links myosin activity to Yorkie regulation.","method":"Genetic epistasis (myosin/Jub/Warts double mutants in Drosophila), co-immunoprecipitation of Jub with α-catenin, in vivo imaging of Jub and Warts localization to junctions under tension, wing growth quantification","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic epistasis, co-IP, tension-dependent localization imaging; multiple orthogonal methods, high-impact validation","pmids":["24995985"],"is_preprint":false},{"year":2014,"finding":"Ajuba activates Aurora-A through two distinct mechanisms: (1) the pre-LIM domain of Ajuba induces autophosphorylation of Aurora-A C-terminal kinase domain and is itself phosphorylated by it; (2) the LIM domain of Ajuba competitively binds to the N-terminal regulatory domain of Aurora-A, disrupting the inhibitory N-terminal/C-terminal intramolecular interaction.","method":"In vitro kinase assay with Ajuba domain truncations, co-immunoprecipitation of Ajuba LIM domain with Aurora-A N-terminal domain, competition binding assay","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay with domain mapping; single lab","pmids":["24680704"],"is_preprint":false},{"year":2015,"finding":"Ajuba promotes adipogenesis by functioning as an obligate co-activator of PPARγ: Ajuba binds the DNA-binding domain of PPARγ via its preLIM region in a ligand-independent manner, recruits p300/CBP via its LIM domain, and facilitates p300/CBP binding to PPARγ. The Ajuba/PPARγ/p300/CBP complex occupies PPARγ target promoters with increased histone acetylation.","method":"Co-immunoprecipitation (Ajuba-PPARγ, Ajuba-p300/CBP), domain mapping by truncation, ChIP at PPARγ target promoters, histone acetylation assay, 3T3-L1 adipogenesis assay with Ajuba KD/OE","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — domain-mapped co-IP, ChIP with histone acetylation readout, functional adipogenesis assay; multiple orthogonal methods","pmids":["26113042"],"is_preprint":false},{"year":2016,"finding":"AJUBA promotes colorectal cancer cell survival by binding the FERM domain of JAK1 to dissociate JAK1 from the IFNγ receptor, inhibiting STAT1 phosphorylation and nuclear translocation, thereby repressing the IFIT2 apoptosis inducer.","method":"Co-immunoprecipitation (AJUBA-JAK1 via FERM domain), Western blot for STAT1 phosphorylation, nuclear fractionation, IFIT2 reporter assay, RNAi knockdown","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain-specific co-IP and downstream pathway readouts; single lab","pmids":["27893714"],"is_preprint":false},{"year":2016,"finding":"CDK1 phosphorylates Ajuba at Ser119 and Ser175 during G2/M phase of the cell cycle; mitotic phosphorylation of Ajuba promotes cell proliferation and anchorage-independent growth in vitro and tumorigenesis in vivo but does not affect Hippo signaling activity.","method":"In vitro CDK1 kinase assay with Ajuba, site-directed mutagenesis (S119A/S175A), cell cycle synchronization, in vivo xenograft tumorigenesis assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay with mutagenesis validation, in vivo tumor growth with phosphomimetic/phospho-null constructs","pmids":["27226586"],"is_preprint":false},{"year":2016,"finding":"AJUBA LIM proteins limit Hippo pathway activity in proliferating mammalian epithelial cells by sequestering a cytosolic Hippo kinase complex in which LATS kinase is inhibited; at the plasma membranes of growth-arrested cells, AJUBA LIM proteins do not associate with or inhibit the Hippo kinase complex. AJUBA LIM proteins did not influence YAP activity in response to mechanical signals.","method":"Co-immunoprecipitation of AJUBA with LATS in cytosolic fraction, subcellular fractionation, YAP phosphorylation/localization assay in proliferating vs. arrested cells, Drosophila wing growth epistasis","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — fractionation-based co-IP, YAP pathway readout, Drosophila epistasis; single lab","pmids":["27457617"],"is_preprint":false},{"year":2018,"finding":"The force-sensitive localization of Ajuba to adherens junctions during epithelial morphogenesis requires its N-terminal domain and two of three LIM domains; Ajuba localizes to sites of myosin accumulation within seconds; Ajuba stabilizes adherens junctions in regions of high tension and is required to maintain cell adhesion during cell rearrangement.","method":"Live imaging of GFP-Ajuba in Drosophila embryos during axis elongation, domain truncation/mutation analysis of localization, tension perturbation (myosin inhibition/activation), cell-cell adhesion assay","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live imaging with defined domain requirements and functional adhesion readout; single lab","pmids":["30006462"],"is_preprint":false},{"year":2018,"finding":"Ajuba stability in HCC cells is regulated by the E3 ligase Hakai: Hakai interacts with Ajuba via its HYB domain and induces Ajuba neddylation (not ubiquitin-proteasome degradation); neddylation inhibitor MLN4924 but not proteasome inhibitor MG132 antagonizes Hakai-induced Ajuba modification.","method":"Co-immunoprecipitation (Hakai-Ajuba via HYB domain), neddylation assay, pharmacological inhibitors (MLN4924, MG132), lentiviral KD/OE","journal":"Journal of experimental & clinical cancer research : CR","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain-specific co-IP, neddylation assay with inhibitor controls; single lab","pmids":["30041665"],"is_preprint":false},{"year":2018,"finding":"Ajuba directly interacts with RPA70 subunit of the RPA complex in a cell cycle-regulated manner; the Ajuba-RPA70 interaction is reduced upon DNA replication stress; Ajuba negatively regulates ATR pathway by directly interacting with RPA70 to prevent inappropriate ATR activation.","method":"Co-immunoprecipitation, direct protein binding assay (Ajuba-RPA70), cell cycle synchronization, DNA damage stress assay","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding confirmation, cell-cycle regulation of interaction; single lab","pmids":["29934626"],"is_preprint":false},{"year":2019,"finding":"Ajuba binds the C-terminus of SP1 transcription factor and functions as a co-activator to enhance SP1 target gene expression; Ajuba is itself a target gene of SP1, forming a feed-forward loop. Ajuba and SP1 co-occupy SP1-responsive promoters as demonstrated by ChIP.","method":"Co-immunoprecipitation, GST pull-down, ChIP at SP1 target promoters, luciferase reporter assay","journal":"Journal of experimental & clinical cancer research : CR","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — GST pull-down plus co-IP plus ChIP; single lab","pmids":["31101117"],"is_preprint":false},{"year":2019,"finding":"α-Catenin is the mechanotransducer responsible for tension-dependent recruitment of Jub (Drosophila Ajuba) to adherens junctions: a specific region of α-catenin associates with Jub, and deletion of a region of α-catenin allows constitutive tension-independent Jub recruitment; increased Jub recruitment to α-catenin increases Yorkie activity and wing growth independently of increased cytoskeletal tension.","method":"Co-immunoprecipitation (α-catenin-Jub), domain deletion mutants of α-catenin, in vivo Drosophila wing growth assay, Yorkie reporter assay","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain-mapped co-IP and functional in vivo readout; single lab","pmids":["30659113"],"is_preprint":false},{"year":2021,"finding":"Ajuba is required for PINK1-dependent mitophagy signaling: ZIKV NS5 antagonizes mitophagy by binding Ajuba and preventing its translocation to depolarized mitochondria where it is required for PINK1 activation; mitophagy suppression by NS5-Ajuba binding amplifies pro-inflammatory chemokine production through PKR sensing of mitochondrial RNA. Ajuba-/- mice show enhanced ZIKV dissemination to tissues.","method":"Co-immunoprecipitation (ZIKV NS5-Ajuba), live-cell imaging of Ajuba translocation to mitochondria, mitophagy assay, Ajuba knockout mouse ZIKV infection model, PKR signaling assay","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — co-IP, live imaging of localization, knockout mouse in vivo model, signaling pathway dissection; multiple orthogonal methods","pmids":["34706234"],"is_preprint":false},{"year":2021,"finding":"SQSTM1/p62 inhibits Ajuba-induced NF-κB activation in a UBA domain-dependent manner; p62 co-expression reduces nuclear Ajuba localization in unstressed cells; Ajuba is degraded by autophagy but co-expression with p62 (wild type or UBA-deficient) protects Ajuba levels.","method":"Co-expression reporter assay for NF-κB, subcellular fractionation, autophagy inhibitor assays, Western blot for Ajuba degradation","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional NF-κB assay, nuclear/cytoplasmic fractionation, degradation pathway determination; single lab","pmids":["34735553"],"is_preprint":false},{"year":2021,"finding":"Ajuba functions as a co-activator of C/EBPβ during adipogenesis: Ajuba interacts with C/EBPβ and recruits CBP to facilitate C/EBPβ binding to promoters of PPARγ and C/EBPα, increasing H3 histone acetylation and target gene expression.","method":"Co-immunoprecipitation (Ajuba-C/EBPβ-CBP), ChIP at PPARγ/C/EBPα promoters, histone acetylation assay, 3T3-L1 differentiation assay with Ajuba KD/OE","journal":"Molecular and cellular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP of ternary complex, ChIP with histone acetylation; single lab","pmids":["34619292"],"is_preprint":false},{"year":2022,"finding":"Distinct LIM domains of Drosophila Jub mediate binding to different partners: LIM2 is specifically required for binding to Warts in co-immunoprecipitation and for wing growth/Yorkie regulation in vivo (along with LIM1); LIM2 and LIM3 are required for regulation of cell shape and Steppke binding; multiple regions of Jub contribute to α-catenin binding and junctional localization.","method":"LIM domain deletion constructs in Drosophila, co-immunoprecipitation of Jub variants with Warts and Steppke in cultured cells, in vivo wing growth assay, Yorkie activity reporter, cell shape quantification","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic LIM domain deletion with co-IP and in vivo functional readouts; single lab","pmids":["35969522"],"is_preprint":false},{"year":2023,"finding":"Ajuba is required for slit diaphragm formation and function in nephrocytes: Djub (Drosophila Ajuba homolog) recruits Warts (LATS2 homolog) to the slit diaphragm; Djub knockdown activates the Hippo pathway; Hippo activation reciprocally reduces Djub levels, suggesting a self-amplifying feedback loop. Loss of Djub or Hippo activation causes actin cytoskeleton rearrangement and increased SD permeability.","method":"Drosophila nephrocyte genetics, RNAi knockdown, co-immunoprecipitation/localization of Djub and Warts at slit diaphragm, functional permeability assay, in vivo epistasis (Warts KD/Yki overexpression rescue)","journal":"Journal of the American Society of Nephrology : JASN","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis, functional permeability assay, localization studies; single lab","pmids":["36930055"],"is_preprint":false},{"year":2023,"finding":"Ajuba is part of a complex with PRMT5 and Aurora-A that shapes the crescent-like Golgi ribbon via modification of HURP: mutual activation of PRMT5 and Aurora-A within the Ajuba/PRMT5/Aurora-A complex leads to arginine methylation then phosphorylation of HURP at p725, which organizes Golgi assembly factors to shape the crescent Golgi ribbon.","method":"Co-immunoprecipitation of Ajuba-PRMT5-Aurora-A complex, in vitro kinase/methyltransferase assays, site-directed mutagenesis of HURP phosphorylation site (725A), knockdown-rescue experiment, immunofluorescence of Golgi morphology","journal":"Cell communication and signaling : CCS","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — in vitro enzymatic assays, mutagenesis rescue, complex co-IP; single lab","pmids":["37370099"],"is_preprint":false},{"year":2023,"finding":"Ajuba forms a complex with p53 and MDM2 to promote proteasomal degradation of p53; AJUBA overexpression decreases p53 levels without affecting p53 transcription; AJUBA expression is induced by chemotherapeutic drugs in a p53-dependent manner, creating a negative feedback loop.","method":"Co-immunoprecipitation (Ajuba-p53-MDM2 complex), Western blot for p53 protein and mRNA (RT-PCR), pharmacological rescue, RNAi knockdown of AJUBA","journal":"Molecular oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP of ternary complex, combined protein/mRNA analysis to separate transcriptional from post-translational effects; single lab","pmids":["36931700"],"is_preprint":false},{"year":2024,"finding":"USP7 deubiquitinase interacts with Ajuba and stabilizes it; USP7 knockdown or treatment with USP7 inhibitor FT671 substantially reduces Ajuba protein levels. Both USP7 and Ajuba knockdown reduce cell-cell adhesion in colorectal cancer cells.","method":"Co-immunoprecipitation (USP7-Ajuba), quantitative proteomics after inducible USP7 knockdown (LC-MS/MS), pharmacological inhibitor (FT671), cell-cell adhesion assay","journal":"Molecular & cellular proteomics : MCP","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus quantitative proteomics plus inhibitor confirmation; single lab","pmids":["39522755"],"is_preprint":false},{"year":2025,"finding":"GSK3β phosphorylates Ajuba at serine 163 within a conserved degron motif (TS163GIS), which mediates interaction with the WD40 domain of β-TrCP E3 ubiquitin ligase (SCFβ-TrCP), leading to ubiquitination and proteasomal degradation of Ajuba. The S163A mutant significantly attenuates Ajuba ubiquitination.","method":"In vitro GSK3β kinase assay on Ajuba, co-immunoprecipitation (Ajuba-β-TrCP via WD40 domain), site-directed mutagenesis (S163A), ubiquitination assay","journal":"Neoplasia (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — in vitro kinase assay, mutagenesis, co-IP domain mapping, ubiquitination assay; single lab","pmids":["40367710"],"is_preprint":false},{"year":2025,"finding":"Jub (Drosophila Ajuba) promotes phosphorylation of the N-terminal intrinsically disordered region of Warts/LATS, and these N-terminal phosphorylation sites influence Wts recruitment into biomolecular condensates and Wts activity. Jub itself forms condensates that recruit Wts. Minibrain and Homeodomain-interacting protein kinase are identified as kinases promoting Wts N-terminal phosphorylation and modulating condensate recruitment.","method":"Condensate formation assay (live imaging of Jub and Wts condensates), phosphorylation assay of Wts N-terminal IDR, mutagenesis of N-terminal phosphorylation sites, genetic epistasis in Drosophila, kinase identification by genetics","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — condensate imaging, phosphorylation site mutagenesis, in vivo genetics; single lab","pmids":["41351836"],"is_preprint":false},{"year":2017,"finding":"Ajuba interacts with Twist transcription factor via its LIM domain (Twist box is required); Ajuba functions as an obligate co-activator of Twist to enhance N-cadherin transcription; Ajuba recruits CBP and Twist to form a ternary complex at the N-cadherin promoter E-box with concomitant histone acetylation.","method":"Co-immunoprecipitation (Ajuba-Twist), domain mutagenesis, luciferase reporter assay, ChIP at N-cadherin promoter, histone acetylation assay","journal":"Journal of cellular and molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain-mapped co-IP, ChIP, reporter assay; single lab (published 2021, year assigned from abstract context)","pmids":["34173718"],"is_preprint":false},{"year":2025,"finding":"APC loss stabilizes Ajuba protein through GSK-3 dysregulation (independent of β-catenin); stabilized Ajuba acts as a positive regulator of YAP, driving a fetal intestinal transcriptional program that is mutually exclusive with β-catenin-driven transcription, contributing to bistable tumor-initiating states.","method":"APC knockout intestinal organoids vs. β-CATENIN activation mutants, Ajuba protein stability assay under GSK-3 inhibition, YAP transcriptional reporter, epistasis (APC-Ajuba-YAP pathway), single-cell transcriptomics","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 2 / Weak — preprint, single lab, mechanism partially inferred from transcriptomic data; GSK-3/Ajuba stabilization needs in vitro kinase confirmation","pmids":["bio_10.1101_2025.03.06.641686"],"is_preprint":true},{"year":2010,"finding":"In medaka, Ajuba localizes to basal bodies of cilia in growth-arrested cells and is essential for ciliogenesis in Kupffer's vesicle cells; Ajuba knockdown results in randomized left-right organ asymmetry and altered expression of left-right body axis determination genes, establishing a role in vertebrate ciliogenesis.","method":"Medaka Ajuba knockdown (morpholino), immunofluorescence of Ajuba at basal bodies, ciliogenesis assay in Kupffer's vesicle cells, in situ hybridization of laterality markers","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — morphant knockdown with specific ciliogenesis and laterality readout, localization imaging; single lab","pmids":["20457130"],"is_preprint":false},{"year":2017,"finding":"Ajuba suppresses CdGAP (a Rac1/Cdc42 GAP) activity at epithelial cell-cell contacts: Ajuba interacts with CdGAP via distinct domains from those used for Rac1 binding; Ajuba binding inhibits CdGAP GAP activity; CdGAP recruitment to junctions does not require Ajuba, but Ajuba controls CdGAP residence at contacts.","method":"Co-immunoprecipitation (Ajuba-CdGAP), in vitro GAP activity assay, immunofluorescence of CdGAP/Ajuba localization, domain mapping","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — in vitro GAP activity assay plus co-IP plus localization; single lab","pmids":["28835688"],"is_preprint":false},{"year":2022,"finding":"Over-expression of AJUBA or WTIP in MCF10A cells displaces LIMD1 from adherens junctions (competitive binding) and reduces LATS1 junctional localization, associated with increased YAP1 phosphorylation and decreased nuclear YAP1, suggesting AJUBA and WTIP have activities distinct from LIMD1 in Hippo regulation at junctions.","method":"Overexpression of AJUBA/WTIP, immunofluorescence of LIMD1 and LATS1 junctional localization, YAP1 phosphorylation and nuclear localization Western blot/imaging","journal":"microPublication biology","confidence":"Low","confidence_rationale":"Tier 3 / Moderate — localization imaging and phosphorylation readout; short report format, single lab","pmids":["36439396"],"is_preprint":false}],"current_model":"AJUBA is a multifunctional scaffold/adaptor LIM-domain protein that shuttles between the cytoplasm and nucleus, operating at the intersection of multiple signaling pathways: it activates Aurora-A kinase at centrosomes to commit cells to mitosis; it negatively regulates the Hippo pathway by sequestering LATS1/2 kinases and inhibiting YAP/TAZ phosphorylation in a tension-sensitive, α-catenin-dependent manner at adherens junctions; it promotes EGFR-RAS-MAPK and JNK-mediated pathway crosstalk with Hippo through phosphorylation-enhanced LATS binding; it acts as a transcriptional co-repressor for SNAG-domain factors (Snail, Gfi1) by recruiting PRMT5 and HDACs, and as a co-activator for PPARγ, C/EBPβ, SP1, and Twist by recruiting CBP/p300; it modulates cell migration by activating PIPKIα to regulate PI(4,5)P2 levels and by localizing p130Cas to promote Rac activation; it negatively regulates Wnt/β-catenin by reinforcing GSK-3β-mediated β-catenin phosphorylation, and its own stability is regulated by GSK-3β-primed SCFβ-TrCP ubiquitination and by Hakai-dependent neddylation."},"narrative":{"mechanistic_narrative":"AJUBA is a cytoplasm-to-nucleus shuttling LIM-domain scaffold that integrates mechanical and growth-factor signals at adherens junctions, the mitotic apparatus, and the nucleus to control cell proliferation, adhesion, and gene expression [PMID:12417594, PMID:20303269]. At cell-cell contacts, AJUBA is recruited to cadherin complexes through α-catenin and binds F-actin, stabilizing junctions under tension [PMID:12417594, PMID:30006462]; this α-catenin association is itself tension-dependent and constitutes the mechanotransduction step that controls junctional AJUBA loading [PMID:24995985, PMID:30659113]. Junctional AJUBA negatively regulates the Hippo pathway: it binds and sequesters the LATS/Warts–WW45/Sav kinase module to inhibit phosphorylation of YAP/Yorkie, an activity conserved from Drosophila to mammals and tuned by cytoskeletal tension [PMID:20303269, PMID:24995985, PMID:27457617]. EGFR-RAS-MAPK and JNK signaling phosphorylate AJUBA-family proteins to enhance their LATS binding, integrating receptor and stress inputs into Hippo output [PMID:23484853, PMID:24023255]. At the centrosome and kinetochore, AJUBA activates Aurora-A by relieving its autoinhibitory N/C-terminal interaction and driving autophosphorylation, committing cells to mitosis [PMID:13678582, PMID:24680704]. In the nucleus, AJUBA acts as a transcriptional corepressor for SNAG-domain factors Snail and Gfi1 by recruiting PRMT5 and HDAC activity to repress targets including E-cadherin [PMID:17909014, PMID:18347060, PMID:18805794], and as a ligand-dependent corepressor for retinoic acid receptors [PMID:20133701], while serving as an obligate p300/CBP-recruiting coactivator for PPARγ, C/EBPβ, SP1, and Twist to drive adipogenic and pro-migratory programs [PMID:26113042, PMID:34619292, PMID:31101117, PMID:34173718]. AJUBA also drives cell migration by activating PIPKIα to position PI(4,5)P2 synthesis at lamellipodia and by localizing p130Cas to nascent focal complexes to promote Rac activation [PMID:15728191, PMID:15870270, PMID:22105346]. AJUBA stability is set by competing modifications: GSK-3β-primed phosphorylation of a degron recruits SCFβ-TrCP for ubiquitination [PMID:40367710], Hakai induces its neddylation [PMID:30041665], and USP7 deubiquitination stabilizes it [PMID:39522755].","teleology":[{"year":1999,"claim":"Established AJUBA as a positive regulator of MAP kinase signaling, linking it to Grb2/Ras and proliferative control before any structural role was known.","evidence":"In vitro and in vivo Grb2 binding, MAPK activity assay, and Xenopus oocyte maturation with Grb2/Ras epistasis","pmids":["10330178"],"confidence":"High","gaps":["Direct mechanism by which Grb2 binding amplifies MAPK output not defined","No structural basis for the proline-rich/SH3 interaction"]},{"year":2000,"claim":"Showed AJUBA shuttles between cytoplasm and nucleus via an NES and that its LIM domains exert distinct effects on proliferation versus differentiation, framing it as a context-switching factor.","evidence":"NES mutagenesis, nuclear accumulation, and proliferation/differentiation assays in P19 cells with JNK readout","pmids":["11029037"],"confidence":"Medium","gaps":["Nuclear targets driving differentiation not identified","Mechanism of JNK requirement unresolved"]},{"year":2002,"claim":"Defined AJUBA as a junctional adaptor bound to α-catenin and F-actin, providing the structural basis for its later mechanotransduction roles.","evidence":"Reciprocal co-IP, immunofluorescence, F-actin binding, and Ajuba-null mouse keratinocyte junction phenotype","pmids":["12417594"],"confidence":"High","gaps":["Whether junctional AJUBA signals to a specific downstream pathway not addressed at this stage","Direct vs indirect α-catenin contact not mapped"]},{"year":2003,"claim":"Identified AJUBA as an Aurora-A activator required for mitotic commitment, assigning it a direct role in cell-cycle entry.","evidence":"Yeast two-hybrid, co-IP, in vitro kinase activation assay, and RNAi in synchronized HeLa cells","pmids":["13678582"],"confidence":"High","gaps":["How junctional/nuclear pools relate to the centrosomal Aurora-A pool unclear","Whether activation is direct allosteric or substrate-priming not resolved here"]},{"year":2005,"claim":"Connected AJUBA to cell migration machinery through p130Cas/Rac and through PIPKIα-mediated PI(4,5)P2 production, establishing a cytoskeletal/lipid signaling axis.","evidence":"Ajuba-null MEF migration, FRET Rac activation, rescue, and in vitro PIPKIα enzyme assay with lipid quantification","pmids":["15728191","15870270"],"confidence":"High","gaps":["How AJUBA spatially couples p130Cas localization to PI(4,5)P2 synthesis not integrated","Direct vs scaffolded activation of PIPKIα at lamellipodia"]},{"year":2005,"claim":"Placed AJUBA in IL-1/NF-κB signaling as an organizer of the PKCζ/p62/TRAF6 complex, broadening its adaptor role to innate signaling.","evidence":"Yeast two-hybrid, co-IP, in vitro PKCζ kinase assay, and NF-κB reporter in Ajuba-null MEFs","pmids":["15870274"],"confidence":"High","gaps":["In vivo relevance to inflammatory responses not tested","Relationship to later p62-mediated AJUBA degradation not connected"]},{"year":2007,"claim":"Defined AJUBA as a SNAG-domain corepressor and a negative Wnt regulator, establishing its nuclear transcriptional and signaling-suppressor functions.","evidence":"Yeast two-hybrid, ChIP at endogenous promoters, reporter assays for SNAG factors; co-IP and β-catenin stability assays for Wnt","pmids":["17909014","17621269"],"confidence":"High","gaps":["Corepressor enzymatic effectors not yet identified (resolved later)","Mechanism of Wnt-induced AJUBA destabilization undefined at this stage"]},{"year":2008,"claim":"Identified the enzymatic effectors of AJUBA repression—PRMT5 and HDAC—showing it recruits histone-modifying activities to silence targets like E-cadherin.","evidence":"Co-IP, gel filtration, HDAC and histone arginine methylation assays, ChIP at endogenous loci","pmids":["18347060","18805794"],"confidence":"High","gaps":["Selectivity determinants for PRMT5 vs HDAC recruitment not mapped","Whether the same complex operates at all SNAG targets unknown"]},{"year":2009,"claim":"Extended AJUBA's mitotic role beyond Aurora-A activation to microtubule-dependent localization at centrosomes and kinetochores with Aurora B and BUBR1.","evidence":"Mitotic immunofluorescence, in vitro microtubule binding, microtubule regrowth, and co-IP with Aurora B/BUBR1","pmids":["18710370"],"confidence":"Medium","gaps":["Functional consequence of Aurora B/BUBR1 binding not dissected","Single lab"]},{"year":2010,"claim":"Established the conserved AJUBA-family role as negative Hippo regulators that inhibit LATS/Warts to activate YAP/Yorkie, anchoring its growth-control function.","evidence":"Drosophila genetic epistasis, co-IP in two species, YAP/Yki phosphorylation assays","pmids":["20303269"],"confidence":"High","gaps":["Subcellular site of LATS inhibition not yet specified (clarified later)","How mechanical inputs feed in not addressed here"]},{"year":2010,"claim":"Broadened AJUBA's functional repertoire to RNA silencing (P-body/miRNA machinery), nuclear receptor corepression of RAR/RXR, and ciliogenesis/left-right asymmetry.","evidence":"Co-IP with RISC/decapping factors and m7GTP pull-down; ligand-dependent RAR co-IP with ChIP; medaka morpholino ciliogenesis and laterality assays","pmids":["20616046","20133701","20457130"],"confidence":"Medium","gaps":["miRNA-silencing role not integrated with adaptor functions","Ciliogenesis mechanism downstream of basal-body localization unknown"]},{"year":2011,"claim":"Refined the Aurora-A relationship in vivo, showing the Drosophila ortholog maintains centrosomal Aurora-A localization rather than activating kinase activity, and identified a Rac-PAK1-AJUBA junctional feedback loop.","evidence":"Drosophila jub mutant Aurora-A localization/activity readouts; in vitro PAK1 phosphorylation of AJUBA at Thr172, phosphomimetic rescue, and Rac-GTP pull-down","pmids":["21402878","22105346"],"confidence":"High","gaps":["Activation vs maintenance models of Aurora-A regulation not reconciled across systems","How PAK1 phosphorylation alters Rac-binding preference structurally unknown"]},{"year":2013,"claim":"Wired growth-factor and stress kinases into Hippo control by showing EGFR-RAS-MAPK and JNK phosphorylate AJUBA-family proteins to enhance LATS binding.","evidence":"Drosophila epistasis (EGFR/Ras/jub), MAPK- and JNK-promoted co-IP, and in vitro JNK phosphorylation of LIMD1","pmids":["23484853","24023255"],"confidence":"High","gaps":["Specific AJUBA phospho-sites engaged by MAPK not all mapped","Quantitative contribution of each kinase to YAP output unresolved"]},{"year":2013,"claim":"Tied AJUBA's Hippo suppression to a cancer context and to genome-integrity surveillance, expanding its disease relevance.","evidence":"LATS2-dependent YAP suppression in mesothelioma (reporter + siRNA rescue); RPA association with ATR/Chk1 pathway readouts on depletion","pmids":["24336325","23755068"],"confidence":"Medium","gaps":["Direct vs indirect RPA engagement unresolved at this stage (addressed later)","Single-lab observations"]},{"year":2014,"claim":"Established the mechanotransduction logic: cytoskeletal tension promotes AJUBA-α-catenin association and tension-dependent Warts recruitment to junctions, converting mechanical force into growth signals.","evidence":"Drosophila myosin/Jub/Warts epistasis, co-IP, tension-dependent junctional imaging, and wing growth quantification; plus domain-mapped Aurora-A activation by in vitro kinase assay","pmids":["24995985","24680704"],"confidence":"High","gaps":["Molecular sensor within α-catenin not yet localized (resolved 2019)","How tension-released LATS reactivates not detailed"]},{"year":2016,"claim":"Resolved where AJUBA inhibits Hippo (cytosolic sequestration of an inhibited LATS complex) and identified CDK1 phosphorylation as a Hippo-independent driver of proliferation, plus a JAK1/STAT1 survival mechanism.","evidence":"Cytosolic-fraction co-IP and YAP readouts in proliferating vs arrested cells; in vitro CDK1 kinase assay with S119A/S175A mutants and xenografts; AJUBA-JAK1 FERM co-IP with STAT1/IFIT2 readouts","pmids":["27457617","27226586","27893714"],"confidence":"High","gaps":["Reconciliation of cytosolic-only model with junctional mechanotransduction model unresolved","How CDK1 sites alter AJUBA function mechanistically unclear"]},{"year":2018,"claim":"Provided structural and regulatory detail on AJUBA functions: direct RPA70 binding restraining ATR, force-sensitive junctional localization domains, and Hakai-induced neddylation controlling stability.","evidence":"Direct Ajuba-RPA70 binding and cell-cycle regulation; live imaging with domain truncations in Drosophila embryos; Hakai HYB-domain co-IP and neddylation assay with inhibitor controls","pmids":["29934626","30006462","30041665"],"confidence":"Medium","gaps":["Physiological trigger switching AJUBA from junction-stabilizing to mitotic/nuclear pools unclear","Neddylation functional consequence beyond stability undefined"]},{"year":2019,"claim":"Pinpointed α-catenin as the tension mechanotransducer recruiting Jub and added SP1 as a coactivator partner in a feed-forward loop, deepening both mechanical and transcriptional models.","evidence":"Domain-deletion α-catenin co-IP with constitutive Jub recruitment and Yorkie/wing readouts; SP1 GST pull-down, co-IP, and ChIP","pmids":["30659113","31101117"],"confidence":"Medium","gaps":["Structural conformational change in α-catenin transmitting force not defined","Single-lab observations"]},{"year":2015,"claim":"Defined AJUBA as an obligate p300/CBP-recruiting coactivator for adipogenic transcription factors, contrasting with its corepressor roles and establishing context-dependent cofactor switching.","evidence":"Domain-mapped co-IP (PPARγ, p300/CBP), ChIP with histone acetylation, and 3T3-L1 adipogenesis assays (extended to C/EBPβ in 2021 and Twist in 2017)","pmids":["26113042","34619292","34173718"],"confidence":"High","gaps":["What determines corepressor vs coactivator outcome at a given promoter unknown","In vivo adipogenic requirement not established"]},{"year":2021,"claim":"Revealed AJUBA's role in PINK1-dependent mitophagy and antiviral defense, and identified p62/autophagy as a degradative regulator of AJUBA.","evidence":"ZIKV NS5-Ajuba co-IP, live imaging of mitochondrial translocation, Ajuba-knockout mouse infection model; p62 UBA-dependent NF-κB and autophagic degradation assays","pmids":["34706234","34735553"],"confidence":"High","gaps":["How AJUBA activates PINK1 mechanistically not defined","Link between mitophagy and nuclear/junctional pools unexplored"]},{"year":2023,"claim":"Extended AJUBA function to Golgi ribbon shaping via a PRMT5/Aurora-A/HURP module, to p53 turnover via MDM2, and to nephrocyte slit-diaphragm Hippo feedback, illustrating its breadth of scaffolded enzymatic complexes.","evidence":"Ajuba-PRMT5-Aurora-A complex co-IP with HURP modification/rescue; Ajuba-p53-MDM2 co-IP with protein/mRNA dissociation; Drosophila nephrocyte epistasis and permeability assays","pmids":["37370099","36931700","36930055"],"confidence":"Medium","gaps":["Whether the Golgi PRMT5/Aurora-A complex overlaps the nuclear repression complex unknown","Single-lab findings each"]},{"year":2024,"claim":"Established a stability-control network for AJUBA: USP7 deubiquitination stabilizes it and supports cell-cell adhesion, while GSK-3β-primed SCFβ-TrCP ubiquitination degrades it.","evidence":"USP7-Ajuba co-IP with quantitative proteomics and FT671 inhibitor; in vitro GSK3β kinase assay, S163A degron mutagenesis, β-TrCP WD40 co-IP, and ubiquitination assay","pmids":["39522755","40367710"],"confidence":"Medium","gaps":["Signals controlling GSK-3β-mediated degron phosphorylation in different contexts unclear","Interplay between neddylation, ubiquitination, and USP7 deubiquitination not integrated"]},{"year":2025,"claim":"Refined Hippo regulation mechanistically, showing Jub promotes Warts N-terminal phosphorylation and recruits Warts into biomolecular condensates that tune kinase activity.","evidence":"Condensate imaging, Warts N-terminal phospho-site mutagenesis, and Drosophila genetics identifying Minibrain and HIPK as kinases","pmids":["41351836"],"confidence":"Medium","gaps":["Whether mammalian AJUBA/LATS form analogous condensates untested","How condensation switches between LATS inhibition and activation unresolved"]},{"year":null,"claim":"How AJUBA's many activities—junctional mechanotransduction, mitotic Aurora-A regulation, opposing transcriptional cofactor roles, mitophagy, and Hippo/Wnt/YAP control—are partitioned spatially and temporally within a single cell remains the central unresolved question.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model explaining how the same LIM domains select among Aurora-A, LATS, α-catenin, and transcription-factor partners","The signal that switches AJUBA between corepressor and coactivator states is unknown","Reconciliation of tension-dependent junctional vs cytosolic-sequestration models of Hippo inhibition is incomplete"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[3,5,7,14,26]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[9,11,12,16,26,33,37,45]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,25,6,48]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[3,13]},{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[11,12]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[29,7]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[2,9,11,16]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3,18,24,30]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[0,13,47]},{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[13]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[14,20,21,24,29]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[0,25,28]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[9,11,16,26]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[7,35]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[31,42,43,41]}],"complexes":["LATS/Warts-WW45/Sav Hippo kinase complex","SNAIL/AJUBA/PRMT5 corepressor complex","PKCζ/p62/TRAF6 signaling complex","Ajuba/PRMT5/Aurora-A complex"],"partners":["LATS2","AURKA","CTNNA1","PRMT5","YAP1","TRAF6","RPA70","BTRC"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96IF1","full_name":"LIM domain-containing protein ajuba","aliases":[],"length_aa":538,"mass_kda":56.9,"function":"Adapter or scaffold protein which participates in the assembly of numerous protein complexes and is involved in several cellular processes such as cell fate determination, cytoskeletal organization, repression of gene transcription, mitosis, cell-cell adhesion, cell differentiation, proliferation and migration. Contributes to the linking and/or strengthening of epithelia cell-cell junctions in part by linking adhesive receptors to the actin cytoskeleton. May be involved in signal transduction from cell adhesion sites to the nucleus. Plays an important role in regulation of the kinase activity of AURKA for mitotic commitment. Also a component of the IL-1 signaling pathway modulating IL-1-induced NFKB1 activation by influencing the assembly and activity of the PRKCZ-SQSTM1-TRAF6 multiprotein signaling complex. Functions as an HDAC-dependent corepressor for a subset of GFI1 target genes. Acts as a transcriptional corepressor for SNAI1 and SNAI2/SLUG-dependent repression of E-cadherin transcription. Acts as a hypoxic regulator by bridging an association between the prolyl hydroxylases and VHL enabling efficient degradation of HIF1A. Positively regulates microRNA (miRNA)-mediated gene silencing. Negatively regulates the Hippo signaling pathway and antagonizes phosphorylation of YAP1","subcellular_location":"Cytoplasm, cytoskeleton; Cell membrane; Cell junction; Nucleus; Cytoplasm, cytoskeleton, microtubule organizing center, centrosome; Cytoplasm, P-body","url":"https://www.uniprot.org/uniprotkb/Q96IF1/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/AJUBA","classification":"Not Classified","n_dependent_lines":6,"n_total_lines":1208,"dependency_fraction":0.004966887417218543},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/AJUBA","total_profiled":1310},"omim":[{"mim_id":"610105","title":"MICRO RNA 125B2; MIR125B2","url":"https://www.omim.org/entry/610105"},{"mim_id":"609066","title":"AJUBA LIM PROTEIN; AJUBA","url":"https://www.omim.org/entry/609066"},{"mim_id":"604505","title":"THYROID HORMONE RECEPTOR INTERACTOR 11; TRIP11","url":"https://www.omim.org/entry/604505"},{"mim_id":"603072","title":"AURORA KINASE A; AURKA","url":"https://www.omim.org/entry/603072"},{"mim_id":"602192","title":"A DISINTEGRIN AND METALLOPROTEINASE DOMAIN 10; ADAM10","url":"https://www.omim.org/entry/602192"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Golgi apparatus","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"skin 1","ntpm":58.2}],"url":"https://www.proteinatlas.org/search/AJUBA"},"hgnc":{"alias_symbol":["MGC15563"],"prev_symbol":["JUB"]},"alphafold":{"accession":"Q96IF1","domains":[{"cath_id":"-","chopping":"495-533","consensus_level":"medium","plddt":83.6177,"start":495,"end":533}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96IF1","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96IF1-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96IF1-F1-predicted_aligned_error_v6.png","plddt_mean":56.97},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=AJUBA","jax_strain_url":"https://www.jax.org/strain/search?query=AJUBA"},"sequence":{"accession":"Q96IF1","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96IF1.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96IF1/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96IF1"}},"corpus_meta":[{"pmid":"13678582","id":"PMC_13678582","title":"Aurora-A and an interacting activator, the LIM protein Ajuba, are required for mitotic commitment in human cells.","date":"2003","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/13678582","citation_count":545,"is_preprint":false},{"pmid":"24995985","id":"PMC_24995985","title":"Cytoskeletal tension inhibits Hippo signaling through an Ajuba-Warts complex.","date":"2014","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/24995985","citation_count":277,"is_preprint":false},{"pmid":"23484853","id":"PMC_23484853","title":"Regulation of Hippo signaling by EGFR-MAPK signaling through Ajuba family proteins.","date":"2013","source":"Developmental cell","url":"https://pubmed.ncbi.nlm.nih.gov/23484853","citation_count":235,"is_preprint":false},{"pmid":"20303269","id":"PMC_20303269","title":"Ajuba LIM proteins are negative regulators of the Hippo signaling pathway.","date":"2010","source":"Current biology : 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Depletion of Ajuba prevented Aurora-A activation at centrosomes in late G2 phase and inhibited mitotic entry.\",\n      \"method\": \"Yeast two-hybrid screen (binding partner identification), co-immunoprecipitation, in vitro kinase assay, RNA interference in synchronized HeLa cells\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro kinase assay plus RNAi phenotype with defined molecular readout; replicated conceptually by multiple subsequent studies\",\n      \"pmids\": [\"13678582\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Ajuba specifically associates with Grb2 through its N-terminal proline-rich pre-LIM domain interacting with either SH3 domain of Grb2; Ajuba augments MAP kinase activity in fibroblasts and promotes Xenopus oocyte meiotic maturation in a Grb2- and Ras-dependent manner.\",\n      \"method\": \"In vitro binding assay, co-immunoprecipitation in vivo, MAP kinase activity assay, Xenopus oocyte meiotic maturation assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro and in vivo binding demonstrated, enzymatic activity measured, functional rescue in oocyte model with genetic epistasis (Grb2/Ras dependence)\",\n      \"pmids\": [\"10330178\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Ajuba contains a functional nuclear export signal and shuttles into the nucleus; accumulation of Ajuba LIM domains in the nucleus of P19 embryonal cells causes growth inhibition and spontaneous endodermal differentiation. The differentiating effect maps to LIM domain 3, proliferation regulation to LIM domains 1 and 2. Ajuba-induced differentiation requires c-Jun kinase activation.\",\n      \"method\": \"Nuclear export signal mutagenesis, nuclear accumulation assay, cell proliferation and differentiation assays in P19 cells, c-Jun kinase activity assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain mapping by truncation constructs plus functional readouts; single lab, multiple orthogonal assays\",\n      \"pmids\": [\"11029037\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Ajuba is recruited to cadherin-dependent cell-cell adhesive complexes in a regulated manner; Ajuba interacts with α-catenin at adherens junctions, α-catenin is required for efficient Ajuba recruitment to junctions, and Ajuba interacts directly with F-actin. Keratinocytes from Ajuba null mice show abnormal cell-cell junction formation and/or stability.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence localization, knockout mouse keratinocytes, F-actin binding assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, null-mouse phenotype, direct actin binding assay; multiple orthogonal methods in one study\",\n      \"pmids\": [\"12417594\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Ajuba interacts with the amino terminus of the glial glutamate transporter GLT-1; Ajuba is coimmunoprecipitated with GLT-1 from brain and co-localizes with GLT-1 at the plasma membrane when co-expressed. Ajuba co-expression did not affect GLT-1 Km or Vmax for glutamate.\",\n      \"method\": \"Co-immunoprecipitation from brain tissue, co-expression in COS cells with co-localization\",\n      \"journal\": \"Molecular and cellular neurosciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — reciprocal co-IP from native brain tissue plus co-localization; functional effect on transporter was negative\",\n      \"pmids\": [\"11860269\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Ajuba promotes cell migration by localizing p130Cas to nascent focal complexes: Ajuba associates with the focal adhesion-targeting domain of p130Cas and is required for tyrosine phosphorylation of FAK, p130Cas, Crk, and Dock180 at nascent focal complexes. Rac activation is blunted in Ajuba null cells; Ajuba acts upstream of p130Cas for Rac activation.\",\n      \"method\": \"Ajuba null mouse embryonic fibroblast migration assay, co-immunoprecipitation, FRET-based Rac activation assay, rescue experiments\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — null-cell phenotype with defined biochemical pathway, FRET Rac activation, rescue experiments; multiple orthogonal methods\",\n      \"pmids\": [\"15728191\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Ajuba regulates cellular PI(4,5)P2 levels by interacting with and activating PIPKIα (PI(4)P 5-kinase) activity while inhibiting PIPKIIβ. In Ajuba-null MEFs, PI(4,5)P2 levels are decreased with a corresponding increase in PI(4)P. Localization of PI(4,5)P2 synthesis to lamellipodia in migrating cells requires Ajuba.\",\n      \"method\": \"In vitro PIPKIα enzymatic activity assay with recombinant Ajuba, lipid phosphoinositide quantification in Ajuba-null MEFs, immunofluorescence localization\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro enzyme activation assay plus null-cell phenotypic confirmation; two orthogonal methods\",\n      \"pmids\": [\"15870270\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Ajuba modulates IL-1-induced NF-κB activation by influencing the assembly and activity of the PKCζ/p62/TRAF6 signaling complex: Ajuba interacts with p62, TRAF6, and PKCζ; recruits TRAF6 to p62; activates PKCζ in vitro; and is a PKCζ substrate. Ajuba null MEFs are defective in NF-κB activation and IKK activity following IL-1 stimulation.\",\n      \"method\": \"Yeast two-hybrid screen, co-immunoprecipitation, in vitro PKCζ kinase assay, Ajuba null mouse embryonic fibroblasts NF-κB reporter assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro kinase assay, null-cell epistasis, multiple binding partners confirmed by co-IP\",\n      \"pmids\": [\"15870274\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Ajuba forms a complex with LATS2 during mitosis; LATS2 contributes to mitotic phosphorylation of Ajuba. Depletion of either LATS2 or Ajuba impairs centrosomal accumulation of γ-tubulin and spindle formation at the onset of mitosis.\",\n      \"method\": \"Yeast two-hybrid screening, co-immunoprecipitation, RNAi depletion, immunofluorescence of γ-tubulin at centrosomes\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid plus co-IP plus RNAi phenotype; single lab\",\n      \"pmids\": [\"16413547\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Ajuba functions as a corepressor for SNAG domain-containing transcription factors (Snail, Gfi1): Ajuba interacts with the SNAG domain in vitro and in vivo, co-localizes with it, and enhances SNAG-mediated transcriptional repression. Chromatin immunoprecipitation shows SNAG-dependent assembly of a multiprotein repression complex including Ajuba at target promoters with histone modifications consistent with repression.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, integrated reporter gene assay, chromatin immunoprecipitation (ChIP), nucleocytoplasmic shuttling assay\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro and in vivo binding, ChIP at endogenous target genes, reporter assay; multiple orthogonal methods\",\n      \"pmids\": [\"17909014\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Ajuba negatively regulates Wnt signaling by promoting GSK-3β-mediated phosphorylation of β-catenin: enforced Ajuba expression destabilizes β-catenin and suppresses Wnt target gene expression; Ajuba reinforces the association between β-catenin and GSK-3β. Wnt stimulation induces β-catenin accumulation and destabilization of Ajuba.\",\n      \"method\": \"Overexpression and knockdown in cells, co-immunoprecipitation, Western blot for β-catenin stability, luciferase reporter assay for Wnt target genes\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP of β-catenin–GSK-3β complex reinforcement, functional reporter assays; single lab\",\n      \"pmids\": [\"17621269\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Ajuba recruits PRMT5 to the SNAIL/AJUBA corepressor complex at the E-cadherin promoter: PRMT5 binds the non-LIM region of Ajuba, is translocated into the nucleus in a SNAIL- and AJUBA-dependent manner, and the ternary SNAIL/AJUBA/PRMT5 complex mediates arginine methylation of histones at the E-cadherin locus causing its repression.\",\n      \"method\": \"Co-immunoprecipitation, ChIP at E-cadherin promoter, histone arginine methylation assay, RNAi depletion, luciferase reporter assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — ChIP with histone methylation readout at endogenous locus, ternary complex co-IP, nuclear translocation dependence; multiple orthogonal methods\",\n      \"pmids\": [\"18347060\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Ajuba forms an endogenous complex with Gfi1 and HDAC and functions as a corepressor for Gfi1 autoregulation in a histone deacetylase-dependent manner: active HDAC activity co-immunoprecipitates with Ajuba or Gfi1; Ajuba LIM domains directly bind Gfi1; ChIP and reciprocal knockdown show selective Ajuba co-repressor function at Gfi1 target genes.\",\n      \"method\": \"Co-immunoprecipitation, gel filtration, HDAC activity assay, ChIP, reciprocal knockdown, reporter assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct binding, HDAC activity assay, ChIP at endogenous genes, epistasis by reciprocal knockdown; multiple orthogonal methods\",\n      \"pmids\": [\"18805794\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Ajuba localizes to centrosomes and kinetochores during mitosis in a microtubule-dependent manner; Ajuba binds microtubules in vitro and follows nascent microtubules from centrosomes to kinetochores. Ajuba interacts with Aurora B and BUBR1 at kinetochores; BUBR1 siRNA disrupts chromosome alignment and modifies Ajuba localization due to premature mitotic exit.\",\n      \"method\": \"Immunofluorescence during mitosis, in vitro microtubule binding assay, microtubule regrowth assay, co-immunoprecipitation with Aurora B and BUBR1, siRNA knockdown\",\n      \"journal\": \"Biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro microtubule binding, co-IP of Aurora B and BUBR1, siRNA phenotype; single lab\",\n      \"pmids\": [\"18710370\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Ajuba LIM proteins (Ajuba, LIMD1, WTIP) are negative regulators of the Hippo pathway: in Drosophila, the single ortholog djub is required for normal epithelial organ size; epistasis places djub downstream of hpo. In mammalian and Drosophila cells, Ajuba LIM proteins/dJub interact with LATS/Warts and WW45/Sav to inhibit phosphorylation of YAP/Yki.\",\n      \"method\": \"Drosophila genetic knockout and RNAi, epistasis analysis (double mutant), co-immunoprecipitation in mammalian and Drosophila cells, YAP/Yki phosphorylation assay\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis in vivo plus co-IP in two species plus kinase substrate assay; independently replicated in subsequent studies\",\n      \"pmids\": [\"20303269\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Ajuba LIM proteins (LIMD1, Ajuba, WTIP) are required for miRNA-mediated but not siRNA-mediated gene silencing; they localize to P-bodies and bind Ago1/2, RCK, Dcp2, and eIF4E in vivo; they also bind the mRNA 5' m7GTP cap-protein complex, and their interaction with eIF4E prevents 4EBP1 and eIF4G interaction.\",\n      \"method\": \"Co-immunoprecipitation with Ago1/2, RCK, Dcp2, eIF4E; m7GTP cap pull-down; RNAi knockdown with miRNA reporter assay; P-body localization by immunofluorescence\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple co-IPs with distinct partners, cap pull-down, functional miRNA silencing assay; single lab\",\n      \"pmids\": [\"20616046\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Ajuba functions as a nuclear receptor corepressor for a subset of nuclear hormone receptors: Ajuba selectively interacts with RARs and RXRs in a ligand-dependent manner through CoRNR-like motifs; simultaneous mutation of these motifs abolishes RAR binding and repression; Ajuba occupies RARE control elements in the absence of atRA and dissociates upon atRA stimulation; PRMT5 binding to Ajuba is mutually exclusive with RAR binding.\",\n      \"method\": \"Co-immunoprecipitation (ligand-dependent), mutagenesis of nuclear receptor interacting motifs, ChIP at endogenous RAR target genes, RARE reporter assay, RNAi depletion in P19 cells\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — binding domain mutagenesis, ChIP at endogenous loci, functional reporter, depletion phenotype; multiple orthogonal methods\",\n      \"pmids\": [\"20133701\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"In Drosophila neuroblasts, Jub (Ajuba ortholog) is required to maintain Aurora-A at the centrosome but does not activate Aurora-A kinase activity itself; in jub mutants Aurora-A activity is unperturbed but Aurora-A recruitment/maintenance at the centrosome is lost, displacing active kinase from centrosomes and causing spindle defects.\",\n      \"method\": \"Drosophila jub genetic mutant analysis, immunofluorescence of Aurora-A localization and activity (phospho-T295), mitotic spindle phenotype quantification\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic null allele with specific molecular readout; single lab, partially contradicts earlier activation model\",\n      \"pmids\": [\"21402878\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Ajuba is required for Rac activation and maintenance of E-cadherin adhesion at cell junctions: Rac activation and actin accumulation at cadherin receptors is impaired in Ajuba-depleted cells. PAK1 directly phosphorylates Ajuba at Thr172; phosphomimetic Ajuba rescues PAK1-inhibition-induced junction defects. Ajuba binds Rac·GDP and Rac·GTP, with phosphorylated Ajuba preferentially interacting with active Rac; Ajuba modulates Rac dynamics at contacts. A Rac-PAK1-Ajuba feedback loop operates at cell-cell contacts.\",\n      \"method\": \"RNAi depletion, in vitro PAK1 kinase assay on Ajuba, phosphomimetic mutant rescue, Rac-GTP pull-down, live imaging of Rac dynamics at junctions\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro kinase assay identifying phosphorylation site, phosphomimetic rescue, pull-down with GTPase; multiple orthogonal methods\",\n      \"pmids\": [\"22105346\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Ajuba binds Isl1 transcription factor and represses its transcriptional activity, is required for RA-dependent autorepression of Isl1 expression in the second heart field, and links retinoic acid signaling to Isl1 to restrict cardiac progenitor cell expansion in zebrafish.\",\n      \"method\": \"Co-immunoprecipitation (Ajuba-Isl1), transcriptional reporter assay, Ajuba morpholino knockdown in zebrafish, in situ hybridization of cardiac progenitor markers, RA signaling pathway epistasis\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP binding, reporter assay, morphant phenotype with epistasis; single lab\",\n      \"pmids\": [\"22771034\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"EGFR-RAS-MAPK signaling promotes phosphorylation of Ajuba family proteins and enhances their binding to Warts/LATS and Salvador/WW45, linking EGFR signaling to Hippo pathway inhibition through Ajuba. In Drosophila, Jub is epistatic to EGFR and Ras for Yorkie regulation.\",\n      \"method\": \"Genetic epistasis in Drosophila (EGFR/Ras/jub double mutants), co-immunoprecipitation (MAPK-promoted binding), MAPK-dependent phosphorylation assay of Ajuba family proteins in mammalian cells\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis in vivo, biochemical binding enhancement by kinase, conserved in two species; multiple orthogonal methods\",\n      \"pmids\": [\"23484853\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"JNK promotes phosphorylation of Ajuba family proteins and promotes binding of LIMD1 or WTIP to LATS1, linking JNK to Hippo pathway inhibition; in Drosophila, Jub is required for JNK-mediated Yorkie activation and wing regeneration after wounding. JNK promotes binding of LIMD1 and LATS1 through direct phosphorylation of LIMD1.\",\n      \"method\": \"Genetic epistasis in Drosophila (jub requirement for JNK-Yki axis), biochemical binding assay (co-immunoprecipitation with LATS1), in vitro JNK phosphorylation of LIMD1\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro kinase assay, co-IP binding assay, in vivo genetic epistasis; multiple orthogonal methods in two species\",\n      \"pmids\": [\"24023255\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"AJUBA suppresses YAP activity in malignant mesothelioma through LATS2: AJUBA transduction into MM cells suppresses YAP-target gene promoter activities, and this suppression is canceled by LATS2 knockdown, establishing AJUBA as a LATS2-dependent inhibitor of YAP in this cancer context.\",\n      \"method\": \"Lentiviral AJUBA transduction, promoter-reporter assay, siRNA knockdown of LATS2, YAP phosphorylation Western blot\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis by LATS2 siRNA rescue, functional reporter assay; single lab\",\n      \"pmids\": [\"24336325\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Ajuba associates with the RPA complex and depletion of Ajuba leads to RPA phosphorylation, increased Chk1 phosphorylation, p53 induction, cell cycle delays, and cell death, placing Ajuba as a repressor of unscheduled ATR-mediated DNA damage response.\",\n      \"method\": \"Co-immunoprecipitation with RPA, RNAi depletion, Western blot for Chk1 and RPA phosphorylation, cell cycle analysis\",\n      \"journal\": \"Frontiers in genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP with RPA and pathway readouts upon depletion; single lab\",\n      \"pmids\": [\"23755068\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Increasing cytoskeletal tension promotes Drosophila wing growth via a mechanism involving Ajuba (Jub)-dependent inhibition of Warts kinase: Jub associates with α-catenin at adherens junctions, and this association is promoted by cytoskeletal tension; Jub recruits Warts to junctions in a tension-dependent manner; genetic dependence on Jub links myosin activity to Yorkie regulation.\",\n      \"method\": \"Genetic epistasis (myosin/Jub/Warts double mutants in Drosophila), co-immunoprecipitation of Jub with α-catenin, in vivo imaging of Jub and Warts localization to junctions under tension, wing growth quantification\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic epistasis, co-IP, tension-dependent localization imaging; multiple orthogonal methods, high-impact validation\",\n      \"pmids\": [\"24995985\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Ajuba activates Aurora-A through two distinct mechanisms: (1) the pre-LIM domain of Ajuba induces autophosphorylation of Aurora-A C-terminal kinase domain and is itself phosphorylated by it; (2) the LIM domain of Ajuba competitively binds to the N-terminal regulatory domain of Aurora-A, disrupting the inhibitory N-terminal/C-terminal intramolecular interaction.\",\n      \"method\": \"In vitro kinase assay with Ajuba domain truncations, co-immunoprecipitation of Ajuba LIM domain with Aurora-A N-terminal domain, competition binding assay\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay with domain mapping; single lab\",\n      \"pmids\": [\"24680704\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Ajuba promotes adipogenesis by functioning as an obligate co-activator of PPARγ: Ajuba binds the DNA-binding domain of PPARγ via its preLIM region in a ligand-independent manner, recruits p300/CBP via its LIM domain, and facilitates p300/CBP binding to PPARγ. The Ajuba/PPARγ/p300/CBP complex occupies PPARγ target promoters with increased histone acetylation.\",\n      \"method\": \"Co-immunoprecipitation (Ajuba-PPARγ, Ajuba-p300/CBP), domain mapping by truncation, ChIP at PPARγ target promoters, histone acetylation assay, 3T3-L1 adipogenesis assay with Ajuba KD/OE\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — domain-mapped co-IP, ChIP with histone acetylation readout, functional adipogenesis assay; multiple orthogonal methods\",\n      \"pmids\": [\"26113042\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"AJUBA promotes colorectal cancer cell survival by binding the FERM domain of JAK1 to dissociate JAK1 from the IFNγ receptor, inhibiting STAT1 phosphorylation and nuclear translocation, thereby repressing the IFIT2 apoptosis inducer.\",\n      \"method\": \"Co-immunoprecipitation (AJUBA-JAK1 via FERM domain), Western blot for STAT1 phosphorylation, nuclear fractionation, IFIT2 reporter assay, RNAi knockdown\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain-specific co-IP and downstream pathway readouts; single lab\",\n      \"pmids\": [\"27893714\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CDK1 phosphorylates Ajuba at Ser119 and Ser175 during G2/M phase of the cell cycle; mitotic phosphorylation of Ajuba promotes cell proliferation and anchorage-independent growth in vitro and tumorigenesis in vivo but does not affect Hippo signaling activity.\",\n      \"method\": \"In vitro CDK1 kinase assay with Ajuba, site-directed mutagenesis (S119A/S175A), cell cycle synchronization, in vivo xenograft tumorigenesis assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay with mutagenesis validation, in vivo tumor growth with phosphomimetic/phospho-null constructs\",\n      \"pmids\": [\"27226586\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"AJUBA LIM proteins limit Hippo pathway activity in proliferating mammalian epithelial cells by sequestering a cytosolic Hippo kinase complex in which LATS kinase is inhibited; at the plasma membranes of growth-arrested cells, AJUBA LIM proteins do not associate with or inhibit the Hippo kinase complex. AJUBA LIM proteins did not influence YAP activity in response to mechanical signals.\",\n      \"method\": \"Co-immunoprecipitation of AJUBA with LATS in cytosolic fraction, subcellular fractionation, YAP phosphorylation/localization assay in proliferating vs. arrested cells, Drosophila wing growth epistasis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — fractionation-based co-IP, YAP pathway readout, Drosophila epistasis; single lab\",\n      \"pmids\": [\"27457617\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The force-sensitive localization of Ajuba to adherens junctions during epithelial morphogenesis requires its N-terminal domain and two of three LIM domains; Ajuba localizes to sites of myosin accumulation within seconds; Ajuba stabilizes adherens junctions in regions of high tension and is required to maintain cell adhesion during cell rearrangement.\",\n      \"method\": \"Live imaging of GFP-Ajuba in Drosophila embryos during axis elongation, domain truncation/mutation analysis of localization, tension perturbation (myosin inhibition/activation), cell-cell adhesion assay\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live imaging with defined domain requirements and functional adhesion readout; single lab\",\n      \"pmids\": [\"30006462\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Ajuba stability in HCC cells is regulated by the E3 ligase Hakai: Hakai interacts with Ajuba via its HYB domain and induces Ajuba neddylation (not ubiquitin-proteasome degradation); neddylation inhibitor MLN4924 but not proteasome inhibitor MG132 antagonizes Hakai-induced Ajuba modification.\",\n      \"method\": \"Co-immunoprecipitation (Hakai-Ajuba via HYB domain), neddylation assay, pharmacological inhibitors (MLN4924, MG132), lentiviral KD/OE\",\n      \"journal\": \"Journal of experimental & clinical cancer research : CR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain-specific co-IP, neddylation assay with inhibitor controls; single lab\",\n      \"pmids\": [\"30041665\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Ajuba directly interacts with RPA70 subunit of the RPA complex in a cell cycle-regulated manner; the Ajuba-RPA70 interaction is reduced upon DNA replication stress; Ajuba negatively regulates ATR pathway by directly interacting with RPA70 to prevent inappropriate ATR activation.\",\n      \"method\": \"Co-immunoprecipitation, direct protein binding assay (Ajuba-RPA70), cell cycle synchronization, DNA damage stress assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding confirmation, cell-cycle regulation of interaction; single lab\",\n      \"pmids\": [\"29934626\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Ajuba binds the C-terminus of SP1 transcription factor and functions as a co-activator to enhance SP1 target gene expression; Ajuba is itself a target gene of SP1, forming a feed-forward loop. Ajuba and SP1 co-occupy SP1-responsive promoters as demonstrated by ChIP.\",\n      \"method\": \"Co-immunoprecipitation, GST pull-down, ChIP at SP1 target promoters, luciferase reporter assay\",\n      \"journal\": \"Journal of experimental & clinical cancer research : CR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — GST pull-down plus co-IP plus ChIP; single lab\",\n      \"pmids\": [\"31101117\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"α-Catenin is the mechanotransducer responsible for tension-dependent recruitment of Jub (Drosophila Ajuba) to adherens junctions: a specific region of α-catenin associates with Jub, and deletion of a region of α-catenin allows constitutive tension-independent Jub recruitment; increased Jub recruitment to α-catenin increases Yorkie activity and wing growth independently of increased cytoskeletal tension.\",\n      \"method\": \"Co-immunoprecipitation (α-catenin-Jub), domain deletion mutants of α-catenin, in vivo Drosophila wing growth assay, Yorkie reporter assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain-mapped co-IP and functional in vivo readout; single lab\",\n      \"pmids\": [\"30659113\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Ajuba is required for PINK1-dependent mitophagy signaling: ZIKV NS5 antagonizes mitophagy by binding Ajuba and preventing its translocation to depolarized mitochondria where it is required for PINK1 activation; mitophagy suppression by NS5-Ajuba binding amplifies pro-inflammatory chemokine production through PKR sensing of mitochondrial RNA. Ajuba-/- mice show enhanced ZIKV dissemination to tissues.\",\n      \"method\": \"Co-immunoprecipitation (ZIKV NS5-Ajuba), live-cell imaging of Ajuba translocation to mitochondria, mitophagy assay, Ajuba knockout mouse ZIKV infection model, PKR signaling assay\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — co-IP, live imaging of localization, knockout mouse in vivo model, signaling pathway dissection; multiple orthogonal methods\",\n      \"pmids\": [\"34706234\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SQSTM1/p62 inhibits Ajuba-induced NF-κB activation in a UBA domain-dependent manner; p62 co-expression reduces nuclear Ajuba localization in unstressed cells; Ajuba is degraded by autophagy but co-expression with p62 (wild type or UBA-deficient) protects Ajuba levels.\",\n      \"method\": \"Co-expression reporter assay for NF-κB, subcellular fractionation, autophagy inhibitor assays, Western blot for Ajuba degradation\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional NF-κB assay, nuclear/cytoplasmic fractionation, degradation pathway determination; single lab\",\n      \"pmids\": [\"34735553\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Ajuba functions as a co-activator of C/EBPβ during adipogenesis: Ajuba interacts with C/EBPβ and recruits CBP to facilitate C/EBPβ binding to promoters of PPARγ and C/EBPα, increasing H3 histone acetylation and target gene expression.\",\n      \"method\": \"Co-immunoprecipitation (Ajuba-C/EBPβ-CBP), ChIP at PPARγ/C/EBPα promoters, histone acetylation assay, 3T3-L1 differentiation assay with Ajuba KD/OE\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP of ternary complex, ChIP with histone acetylation; single lab\",\n      \"pmids\": [\"34619292\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Distinct LIM domains of Drosophila Jub mediate binding to different partners: LIM2 is specifically required for binding to Warts in co-immunoprecipitation and for wing growth/Yorkie regulation in vivo (along with LIM1); LIM2 and LIM3 are required for regulation of cell shape and Steppke binding; multiple regions of Jub contribute to α-catenin binding and junctional localization.\",\n      \"method\": \"LIM domain deletion constructs in Drosophila, co-immunoprecipitation of Jub variants with Warts and Steppke in cultured cells, in vivo wing growth assay, Yorkie activity reporter, cell shape quantification\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic LIM domain deletion with co-IP and in vivo functional readouts; single lab\",\n      \"pmids\": [\"35969522\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Ajuba is required for slit diaphragm formation and function in nephrocytes: Djub (Drosophila Ajuba homolog) recruits Warts (LATS2 homolog) to the slit diaphragm; Djub knockdown activates the Hippo pathway; Hippo activation reciprocally reduces Djub levels, suggesting a self-amplifying feedback loop. Loss of Djub or Hippo activation causes actin cytoskeleton rearrangement and increased SD permeability.\",\n      \"method\": \"Drosophila nephrocyte genetics, RNAi knockdown, co-immunoprecipitation/localization of Djub and Warts at slit diaphragm, functional permeability assay, in vivo epistasis (Warts KD/Yki overexpression rescue)\",\n      \"journal\": \"Journal of the American Society of Nephrology : JASN\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis, functional permeability assay, localization studies; single lab\",\n      \"pmids\": [\"36930055\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Ajuba is part of a complex with PRMT5 and Aurora-A that shapes the crescent-like Golgi ribbon via modification of HURP: mutual activation of PRMT5 and Aurora-A within the Ajuba/PRMT5/Aurora-A complex leads to arginine methylation then phosphorylation of HURP at p725, which organizes Golgi assembly factors to shape the crescent Golgi ribbon.\",\n      \"method\": \"Co-immunoprecipitation of Ajuba-PRMT5-Aurora-A complex, in vitro kinase/methyltransferase assays, site-directed mutagenesis of HURP phosphorylation site (725A), knockdown-rescue experiment, immunofluorescence of Golgi morphology\",\n      \"journal\": \"Cell communication and signaling : CCS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro enzymatic assays, mutagenesis rescue, complex co-IP; single lab\",\n      \"pmids\": [\"37370099\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Ajuba forms a complex with p53 and MDM2 to promote proteasomal degradation of p53; AJUBA overexpression decreases p53 levels without affecting p53 transcription; AJUBA expression is induced by chemotherapeutic drugs in a p53-dependent manner, creating a negative feedback loop.\",\n      \"method\": \"Co-immunoprecipitation (Ajuba-p53-MDM2 complex), Western blot for p53 protein and mRNA (RT-PCR), pharmacological rescue, RNAi knockdown of AJUBA\",\n      \"journal\": \"Molecular oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP of ternary complex, combined protein/mRNA analysis to separate transcriptional from post-translational effects; single lab\",\n      \"pmids\": [\"36931700\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"USP7 deubiquitinase interacts with Ajuba and stabilizes it; USP7 knockdown or treatment with USP7 inhibitor FT671 substantially reduces Ajuba protein levels. Both USP7 and Ajuba knockdown reduce cell-cell adhesion in colorectal cancer cells.\",\n      \"method\": \"Co-immunoprecipitation (USP7-Ajuba), quantitative proteomics after inducible USP7 knockdown (LC-MS/MS), pharmacological inhibitor (FT671), cell-cell adhesion assay\",\n      \"journal\": \"Molecular & cellular proteomics : MCP\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus quantitative proteomics plus inhibitor confirmation; single lab\",\n      \"pmids\": [\"39522755\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"GSK3β phosphorylates Ajuba at serine 163 within a conserved degron motif (TS163GIS), which mediates interaction with the WD40 domain of β-TrCP E3 ubiquitin ligase (SCFβ-TrCP), leading to ubiquitination and proteasomal degradation of Ajuba. The S163A mutant significantly attenuates Ajuba ubiquitination.\",\n      \"method\": \"In vitro GSK3β kinase assay on Ajuba, co-immunoprecipitation (Ajuba-β-TrCP via WD40 domain), site-directed mutagenesis (S163A), ubiquitination assay\",\n      \"journal\": \"Neoplasia (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro kinase assay, mutagenesis, co-IP domain mapping, ubiquitination assay; single lab\",\n      \"pmids\": [\"40367710\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Jub (Drosophila Ajuba) promotes phosphorylation of the N-terminal intrinsically disordered region of Warts/LATS, and these N-terminal phosphorylation sites influence Wts recruitment into biomolecular condensates and Wts activity. Jub itself forms condensates that recruit Wts. Minibrain and Homeodomain-interacting protein kinase are identified as kinases promoting Wts N-terminal phosphorylation and modulating condensate recruitment.\",\n      \"method\": \"Condensate formation assay (live imaging of Jub and Wts condensates), phosphorylation assay of Wts N-terminal IDR, mutagenesis of N-terminal phosphorylation sites, genetic epistasis in Drosophila, kinase identification by genetics\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — condensate imaging, phosphorylation site mutagenesis, in vivo genetics; single lab\",\n      \"pmids\": [\"41351836\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Ajuba interacts with Twist transcription factor via its LIM domain (Twist box is required); Ajuba functions as an obligate co-activator of Twist to enhance N-cadherin transcription; Ajuba recruits CBP and Twist to form a ternary complex at the N-cadherin promoter E-box with concomitant histone acetylation.\",\n      \"method\": \"Co-immunoprecipitation (Ajuba-Twist), domain mutagenesis, luciferase reporter assay, ChIP at N-cadherin promoter, histone acetylation assay\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain-mapped co-IP, ChIP, reporter assay; single lab (published 2021, year assigned from abstract context)\",\n      \"pmids\": [\"34173718\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"APC loss stabilizes Ajuba protein through GSK-3 dysregulation (independent of β-catenin); stabilized Ajuba acts as a positive regulator of YAP, driving a fetal intestinal transcriptional program that is mutually exclusive with β-catenin-driven transcription, contributing to bistable tumor-initiating states.\",\n      \"method\": \"APC knockout intestinal organoids vs. β-CATENIN activation mutants, Ajuba protein stability assay under GSK-3 inhibition, YAP transcriptional reporter, epistasis (APC-Ajuba-YAP pathway), single-cell transcriptomics\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 2 / Weak — preprint, single lab, mechanism partially inferred from transcriptomic data; GSK-3/Ajuba stabilization needs in vitro kinase confirmation\",\n      \"pmids\": [\"bio_10.1101_2025.03.06.641686\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"In medaka, Ajuba localizes to basal bodies of cilia in growth-arrested cells and is essential for ciliogenesis in Kupffer's vesicle cells; Ajuba knockdown results in randomized left-right organ asymmetry and altered expression of left-right body axis determination genes, establishing a role in vertebrate ciliogenesis.\",\n      \"method\": \"Medaka Ajuba knockdown (morpholino), immunofluorescence of Ajuba at basal bodies, ciliogenesis assay in Kupffer's vesicle cells, in situ hybridization of laterality markers\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — morphant knockdown with specific ciliogenesis and laterality readout, localization imaging; single lab\",\n      \"pmids\": [\"20457130\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Ajuba suppresses CdGAP (a Rac1/Cdc42 GAP) activity at epithelial cell-cell contacts: Ajuba interacts with CdGAP via distinct domains from those used for Rac1 binding; Ajuba binding inhibits CdGAP GAP activity; CdGAP recruitment to junctions does not require Ajuba, but Ajuba controls CdGAP residence at contacts.\",\n      \"method\": \"Co-immunoprecipitation (Ajuba-CdGAP), in vitro GAP activity assay, immunofluorescence of CdGAP/Ajuba localization, domain mapping\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro GAP activity assay plus co-IP plus localization; single lab\",\n      \"pmids\": [\"28835688\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Over-expression of AJUBA or WTIP in MCF10A cells displaces LIMD1 from adherens junctions (competitive binding) and reduces LATS1 junctional localization, associated with increased YAP1 phosphorylation and decreased nuclear YAP1, suggesting AJUBA and WTIP have activities distinct from LIMD1 in Hippo regulation at junctions.\",\n      \"method\": \"Overexpression of AJUBA/WTIP, immunofluorescence of LIMD1 and LATS1 junctional localization, YAP1 phosphorylation and nuclear localization Western blot/imaging\",\n      \"journal\": \"microPublication biology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — localization imaging and phosphorylation readout; short report format, single lab\",\n      \"pmids\": [\"36439396\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"AJUBA is a multifunctional scaffold/adaptor LIM-domain protein that shuttles between the cytoplasm and nucleus, operating at the intersection of multiple signaling pathways: it activates Aurora-A kinase at centrosomes to commit cells to mitosis; it negatively regulates the Hippo pathway by sequestering LATS1/2 kinases and inhibiting YAP/TAZ phosphorylation in a tension-sensitive, α-catenin-dependent manner at adherens junctions; it promotes EGFR-RAS-MAPK and JNK-mediated pathway crosstalk with Hippo through phosphorylation-enhanced LATS binding; it acts as a transcriptional co-repressor for SNAG-domain factors (Snail, Gfi1) by recruiting PRMT5 and HDACs, and as a co-activator for PPARγ, C/EBPβ, SP1, and Twist by recruiting CBP/p300; it modulates cell migration by activating PIPKIα to regulate PI(4,5)P2 levels and by localizing p130Cas to promote Rac activation; it negatively regulates Wnt/β-catenin by reinforcing GSK-3β-mediated β-catenin phosphorylation, and its own stability is regulated by GSK-3β-primed SCFβ-TrCP ubiquitination and by Hakai-dependent neddylation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"AJUBA is a cytoplasm-to-nucleus shuttling LIM-domain scaffold that integrates mechanical and growth-factor signals at adherens junctions, the mitotic apparatus, and the nucleus to control cell proliferation, adhesion, and gene expression [#3, #14]. At cell-cell contacts, AJUBA is recruited to cadherin complexes through α-catenin and binds F-actin, stabilizing junctions under tension [#3, #30]; this α-catenin association is itself tension-dependent and constitutes the mechanotransduction step that controls junctional AJUBA loading [#24, #34]. Junctional AJUBA negatively regulates the Hippo pathway: it binds and sequesters the LATS/Warts–WW45/Sav kinase module to inhibit phosphorylation of YAP/Yorkie, an activity conserved from Drosophila to mammals and tuned by cytoskeletal tension [#14, #24, #29]. EGFR-RAS-MAPK and JNK signaling phosphorylate AJUBA-family proteins to enhance their LATS binding, integrating receptor and stress inputs into Hippo output [#20, #21]. At the centrosome and kinetochore, AJUBA activates Aurora-A by relieving its autoinhibitory N/C-terminal interaction and driving autophosphorylation, committing cells to mitosis [#0, #25]. In the nucleus, AJUBA acts as a transcriptional corepressor for SNAG-domain factors Snail and Gfi1 by recruiting PRMT5 and HDAC activity to repress targets including E-cadherin [#9, #11, #12], and as a ligand-dependent corepressor for retinoic acid receptors [#16], while serving as an obligate p300/CBP-recruiting coactivator for PPARγ, C/EBPβ, SP1, and Twist to drive adipogenic and pro-migratory programs [#26, #37, #33, #45]. AJUBA also drives cell migration by activating PIPKIα to position PI(4,5)P2 synthesis at lamellipodia and by localizing p130Cas to nascent focal complexes to promote Rac activation [#5, #6, #18]. AJUBA stability is set by competing modifications: GSK-3β-primed phosphorylation of a degron recruits SCFβ-TrCP for ubiquitination [#43], Hakai induces its neddylation [#31], and USP7 deubiquitination stabilizes it [#42].\"\n,\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established AJUBA as a positive regulator of MAP kinase signaling, linking it to Grb2/Ras and proliferative control before any structural role was known.\",\n      \"evidence\": \"In vitro and in vivo Grb2 binding, MAPK activity assay, and Xenopus oocyte maturation with Grb2/Ras epistasis\",\n      \"pmids\": [\"10330178\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct mechanism by which Grb2 binding amplifies MAPK output not defined\", \"No structural basis for the proline-rich/SH3 interaction\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Showed AJUBA shuttles between cytoplasm and nucleus via an NES and that its LIM domains exert distinct effects on proliferation versus differentiation, framing it as a context-switching factor.\",\n      \"evidence\": \"NES mutagenesis, nuclear accumulation, and proliferation/differentiation assays in P19 cells with JNK readout\",\n      \"pmids\": [\"11029037\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Nuclear targets driving differentiation not identified\", \"Mechanism of JNK requirement unresolved\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Defined AJUBA as a junctional adaptor bound to α-catenin and F-actin, providing the structural basis for its later mechanotransduction roles.\",\n      \"evidence\": \"Reciprocal co-IP, immunofluorescence, F-actin binding, and Ajuba-null mouse keratinocyte junction phenotype\",\n      \"pmids\": [\"12417594\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether junctional AJUBA signals to a specific downstream pathway not addressed at this stage\", \"Direct vs indirect α-catenin contact not mapped\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Identified AJUBA as an Aurora-A activator required for mitotic commitment, assigning it a direct role in cell-cycle entry.\",\n      \"evidence\": \"Yeast two-hybrid, co-IP, in vitro kinase activation assay, and RNAi in synchronized HeLa cells\",\n      \"pmids\": [\"13678582\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How junctional/nuclear pools relate to the centrosomal Aurora-A pool unclear\", \"Whether activation is direct allosteric or substrate-priming not resolved here\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Connected AJUBA to cell migration machinery through p130Cas/Rac and through PIPKIα-mediated PI(4,5)P2 production, establishing a cytoskeletal/lipid signaling axis.\",\n      \"evidence\": \"Ajuba-null MEF migration, FRET Rac activation, rescue, and in vitro PIPKIα enzyme assay with lipid quantification\",\n      \"pmids\": [\"15728191\", \"15870270\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How AJUBA spatially couples p130Cas localization to PI(4,5)P2 synthesis not integrated\", \"Direct vs scaffolded activation of PIPKIα at lamellipodia\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Placed AJUBA in IL-1/NF-κB signaling as an organizer of the PKCζ/p62/TRAF6 complex, broadening its adaptor role to innate signaling.\",\n      \"evidence\": \"Yeast two-hybrid, co-IP, in vitro PKCζ kinase assay, and NF-κB reporter in Ajuba-null MEFs\",\n      \"pmids\": [\"15870274\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance to inflammatory responses not tested\", \"Relationship to later p62-mediated AJUBA degradation not connected\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined AJUBA as a SNAG-domain corepressor and a negative Wnt regulator, establishing its nuclear transcriptional and signaling-suppressor functions.\",\n      \"evidence\": \"Yeast two-hybrid, ChIP at endogenous promoters, reporter assays for SNAG factors; co-IP and β-catenin stability assays for Wnt\",\n      \"pmids\": [\"17909014\", \"17621269\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Corepressor enzymatic effectors not yet identified (resolved later)\", \"Mechanism of Wnt-induced AJUBA destabilization undefined at this stage\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identified the enzymatic effectors of AJUBA repression—PRMT5 and HDAC—showing it recruits histone-modifying activities to silence targets like E-cadherin.\",\n      \"evidence\": \"Co-IP, gel filtration, HDAC and histone arginine methylation assays, ChIP at endogenous loci\",\n      \"pmids\": [\"18347060\", \"18805794\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Selectivity determinants for PRMT5 vs HDAC recruitment not mapped\", \"Whether the same complex operates at all SNAG targets unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Extended AJUBA's mitotic role beyond Aurora-A activation to microtubule-dependent localization at centrosomes and kinetochores with Aurora B and BUBR1.\",\n      \"evidence\": \"Mitotic immunofluorescence, in vitro microtubule binding, microtubule regrowth, and co-IP with Aurora B/BUBR1\",\n      \"pmids\": [\"18710370\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of Aurora B/BUBR1 binding not dissected\", \"Single lab\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Established the conserved AJUBA-family role as negative Hippo regulators that inhibit LATS/Warts to activate YAP/Yorkie, anchoring its growth-control function.\",\n      \"evidence\": \"Drosophila genetic epistasis, co-IP in two species, YAP/Yki phosphorylation assays\",\n      \"pmids\": [\"20303269\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Subcellular site of LATS inhibition not yet specified (clarified later)\", \"How mechanical inputs feed in not addressed here\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Broadened AJUBA's functional repertoire to RNA silencing (P-body/miRNA machinery), nuclear receptor corepression of RAR/RXR, and ciliogenesis/left-right asymmetry.\",\n      \"evidence\": \"Co-IP with RISC/decapping factors and m7GTP pull-down; ligand-dependent RAR co-IP with ChIP; medaka morpholino ciliogenesis and laterality assays\",\n      \"pmids\": [\"20616046\", \"20133701\", \"20457130\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"miRNA-silencing role not integrated with adaptor functions\", \"Ciliogenesis mechanism downstream of basal-body localization unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Refined the Aurora-A relationship in vivo, showing the Drosophila ortholog maintains centrosomal Aurora-A localization rather than activating kinase activity, and identified a Rac-PAK1-AJUBA junctional feedback loop.\",\n      \"evidence\": \"Drosophila jub mutant Aurora-A localization/activity readouts; in vitro PAK1 phosphorylation of AJUBA at Thr172, phosphomimetic rescue, and Rac-GTP pull-down\",\n      \"pmids\": [\"21402878\", \"22105346\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Activation vs maintenance models of Aurora-A regulation not reconciled across systems\", \"How PAK1 phosphorylation alters Rac-binding preference structurally unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Wired growth-factor and stress kinases into Hippo control by showing EGFR-RAS-MAPK and JNK phosphorylate AJUBA-family proteins to enhance LATS binding.\",\n      \"evidence\": \"Drosophila epistasis (EGFR/Ras/jub), MAPK- and JNK-promoted co-IP, and in vitro JNK phosphorylation of LIMD1\",\n      \"pmids\": [\"23484853\", \"24023255\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific AJUBA phospho-sites engaged by MAPK not all mapped\", \"Quantitative contribution of each kinase to YAP output unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Tied AJUBA's Hippo suppression to a cancer context and to genome-integrity surveillance, expanding its disease relevance.\",\n      \"evidence\": \"LATS2-dependent YAP suppression in mesothelioma (reporter + siRNA rescue); RPA association with ATR/Chk1 pathway readouts on depletion\",\n      \"pmids\": [\"24336325\", \"23755068\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect RPA engagement unresolved at this stage (addressed later)\", \"Single-lab observations\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Established the mechanotransduction logic: cytoskeletal tension promotes AJUBA-α-catenin association and tension-dependent Warts recruitment to junctions, converting mechanical force into growth signals.\",\n      \"evidence\": \"Drosophila myosin/Jub/Warts epistasis, co-IP, tension-dependent junctional imaging, and wing growth quantification; plus domain-mapped Aurora-A activation by in vitro kinase assay\",\n      \"pmids\": [\"24995985\", \"24680704\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular sensor within α-catenin not yet localized (resolved 2019)\", \"How tension-released LATS reactivates not detailed\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Resolved where AJUBA inhibits Hippo (cytosolic sequestration of an inhibited LATS complex) and identified CDK1 phosphorylation as a Hippo-independent driver of proliferation, plus a JAK1/STAT1 survival mechanism.\",\n      \"evidence\": \"Cytosolic-fraction co-IP and YAP readouts in proliferating vs arrested cells; in vitro CDK1 kinase assay with S119A/S175A mutants and xenografts; AJUBA-JAK1 FERM co-IP with STAT1/IFIT2 readouts\",\n      \"pmids\": [\"27457617\", \"27226586\", \"27893714\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Reconciliation of cytosolic-only model with junctional mechanotransduction model unresolved\", \"How CDK1 sites alter AJUBA function mechanistically unclear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Provided structural and regulatory detail on AJUBA functions: direct RPA70 binding restraining ATR, force-sensitive junctional localization domains, and Hakai-induced neddylation controlling stability.\",\n      \"evidence\": \"Direct Ajuba-RPA70 binding and cell-cycle regulation; live imaging with domain truncations in Drosophila embryos; Hakai HYB-domain co-IP and neddylation assay with inhibitor controls\",\n      \"pmids\": [\"29934626\", \"30006462\", \"30041665\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological trigger switching AJUBA from junction-stabilizing to mitotic/nuclear pools unclear\", \"Neddylation functional consequence beyond stability undefined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Pinpointed α-catenin as the tension mechanotransducer recruiting Jub and added SP1 as a coactivator partner in a feed-forward loop, deepening both mechanical and transcriptional models.\",\n      \"evidence\": \"Domain-deletion α-catenin co-IP with constitutive Jub recruitment and Yorkie/wing readouts; SP1 GST pull-down, co-IP, and ChIP\",\n      \"pmids\": [\"30659113\", \"31101117\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural conformational change in α-catenin transmitting force not defined\", \"Single-lab observations\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined AJUBA as an obligate p300/CBP-recruiting coactivator for adipogenic transcription factors, contrasting with its corepressor roles and establishing context-dependent cofactor switching.\",\n      \"evidence\": \"Domain-mapped co-IP (PPARγ, p300/CBP), ChIP with histone acetylation, and 3T3-L1 adipogenesis assays (extended to C/EBPβ in 2021 and Twist in 2017)\",\n      \"pmids\": [\"26113042\", \"34619292\", \"34173718\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"What determines corepressor vs coactivator outcome at a given promoter unknown\", \"In vivo adipogenic requirement not established\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Revealed AJUBA's role in PINK1-dependent mitophagy and antiviral defense, and identified p62/autophagy as a degradative regulator of AJUBA.\",\n      \"evidence\": \"ZIKV NS5-Ajuba co-IP, live imaging of mitochondrial translocation, Ajuba-knockout mouse infection model; p62 UBA-dependent NF-κB and autophagic degradation assays\",\n      \"pmids\": [\"34706234\", \"34735553\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How AJUBA activates PINK1 mechanistically not defined\", \"Link between mitophagy and nuclear/junctional pools unexplored\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Extended AJUBA function to Golgi ribbon shaping via a PRMT5/Aurora-A/HURP module, to p53 turnover via MDM2, and to nephrocyte slit-diaphragm Hippo feedback, illustrating its breadth of scaffolded enzymatic complexes.\",\n      \"evidence\": \"Ajuba-PRMT5-Aurora-A complex co-IP with HURP modification/rescue; Ajuba-p53-MDM2 co-IP with protein/mRNA dissociation; Drosophila nephrocyte epistasis and permeability assays\",\n      \"pmids\": [\"37370099\", \"36931700\", \"36930055\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether the Golgi PRMT5/Aurora-A complex overlaps the nuclear repression complex unknown\", \"Single-lab findings each\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Established a stability-control network for AJUBA: USP7 deubiquitination stabilizes it and supports cell-cell adhesion, while GSK-3β-primed SCFβ-TrCP ubiquitination degrades it.\",\n      \"evidence\": \"USP7-Ajuba co-IP with quantitative proteomics and FT671 inhibitor; in vitro GSK3β kinase assay, S163A degron mutagenesis, β-TrCP WD40 co-IP, and ubiquitination assay\",\n      \"pmids\": [\"39522755\", \"40367710\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Signals controlling GSK-3β-mediated degron phosphorylation in different contexts unclear\", \"Interplay between neddylation, ubiquitination, and USP7 deubiquitination not integrated\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Refined Hippo regulation mechanistically, showing Jub promotes Warts N-terminal phosphorylation and recruits Warts into biomolecular condensates that tune kinase activity.\",\n      \"evidence\": \"Condensate imaging, Warts N-terminal phospho-site mutagenesis, and Drosophila genetics identifying Minibrain and HIPK as kinases\",\n      \"pmids\": [\"41351836\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether mammalian AJUBA/LATS form analogous condensates untested\", \"How condensation switches between LATS inhibition and activation unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How AJUBA's many activities—junctional mechanotransduction, mitotic Aurora-A regulation, opposing transcriptional cofactor roles, mitophagy, and Hippo/Wnt/YAP control—are partitioned spatially and temporally within a single cell remains the central unresolved question.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model explaining how the same LIM domains select among Aurora-A, LATS, α-catenin, and transcription-factor partners\", \"The signal that switches AJUBA between corepressor and coactivator states is unknown\", \"Reconciliation of tension-dependent junctional vs cytosolic-sequestration models of Hippo inhibition is incomplete\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [3, 5, 7, 14, 26]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [9, 11, 12, 16, 26, 33, 37, 45]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 25, 6, 48]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [3, 13]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [11, 12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [29, 7]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [2, 9, 11, 16]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3, 18, 24, 30]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [0, 13, 47]},\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [13]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [14, 20, 21, 24, 29]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [0, 25, 28]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [9, 11, 16, 26]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [7, 35]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [31, 42, 43, 41]}\n    ],\n    \"complexes\": [\n      \"LATS/Warts-WW45/Sav Hippo kinase complex\",\n      \"SNAIL/AJUBA/PRMT5 corepressor complex\",\n      \"PKCζ/p62/TRAF6 signaling complex\",\n      \"Ajuba/PRMT5/Aurora-A complex\"\n    ],\n    \"partners\": [\n      \"LATS2\",\n      \"AURKA\",\n      \"CTNNA1\",\n      \"PRMT5\",\n      \"YAP1\",\n      \"TRAF6\",\n      \"RPA70\",\n      \"BTRC\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}