{"gene":"PLEKHO1","run_date":"2026-06-10T06:43:35","timeline":{"discoveries":[{"year":2000,"finding":"CKIP-1 (PLEKHO1) was identified as a novel CK2α-interacting protein that binds CK2α but not CK2α' in yeast two-hybrid and co-immunoprecipitation assays; CK2 kinase activity is detected in anti-CKIP-1 immunoprecipitates from non-transfected cells. EGFP-CKIP-1 localizes to the nucleus and plasma membrane, with plasma membrane localization dependent on the N-terminal pleckstrin homology (PH) domain.","method":"Yeast two-hybrid, in vitro binding assay, co-immunoprecipitation, EGFP fusion live-cell imaging, deletion analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, yeast two-hybrid, in vitro binding, and localization experiments in a single study; foundational paper replicated by multiple subsequent labs","pmids":["10799509"],"is_preprint":false},{"year":2004,"finding":"CKIP-1 binds phosphatidylinositol 3-phosphate through its PH domain and translocates to the plasma membrane in a PI3K-dependent manner. In C2C12 myoblasts, CKIP-1 overexpression promotes proliferation and then stimulates myogenin expression and cell fusion; siRNA silencing of CKIP-1 abolishes proliferation and delays myogenin expression, implicating CKIP-1 as a component of PI3K signaling in muscle differentiation.","method":"PI3K inhibitors (LY294002, wortmannin), active/dominant-negative PI3K constructs, RNA interference, immunofluorescence, cell fusion assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (pharmacological inhibition, genetic manipulation, RNAi) in a single study, replicated by myoblast fusion paper (PMID:22553210)","pmids":["14729969"],"is_preprint":false},{"year":2005,"finding":"CKIP-1 overexpression causes distinct changes in cell morphology and increases F-actin levels. Tandem affinity purification and mass spectrometry identified actin capping protein subunits CPα and CPβ as CKIP-1 interaction partners; co-immunoprecipitation and colocalization confirmed the interaction. CKIP-1 and CK2 together inhibit capping protein activity at barbed ends of actin filaments. CK2 phosphorylates Ser9 of CPα in vitro and in vivo.","method":"Tandem affinity purification, mass spectrometry, co-immunoprecipitation, immunofluorescence, quantitative phalloidin binding, in vitro kinase assay, CK2 inhibitor treatment","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro kinase assay for CPα phosphorylation, barbed-end capping assay, TAP-MS identification confirmed by co-IP and colocalization; replicated by follow-up mutagenesis paper (PMID:16987810)","pmids":["15831458"],"is_preprint":false},{"year":2005,"finding":"CKIP-1 functions as a plasma membrane-bound AP-1 regulator. During apoptosis, CKIP-1 is cleaved by caspase-3 and translocates from plasma membrane to cytoplasm and then nucleus; C-terminal cleavage fragments strongly repress AP-1 transcriptional activity. CKIP-1 overexpression promotes apoptosis via a positive feedback loop with caspase-3; RNAi knockdown of CKIP-1 attenuates apoptosis sensitivity.","method":"Caspase-3 cleavage assay, subcellular fractionation and live imaging, AP-1 reporter assay, RNA interference, overexpression in cells","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (cleavage assay, localization, reporter, RNAi) in single study; finding replicated implicitly in subsequent apoptosis papers","pmids":["15706351"],"is_preprint":false},{"year":2005,"finding":"CKIP-1 recruits nuclear ATM kinase partially to the plasma membrane through direct interaction with ATM; only the plasma membrane-localized CKIP-1 forms a complex with ATM. CKIP-1 overexpression prevents p53 degradation by increasing p53 Ser-15 phosphorylation, consistent with enhanced ATM activity toward p53.","method":"Co-immunoprecipitation, subcellular fractionation, immunofluorescence, cycloheximide chase assay, phospho-specific immunoblotting","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and localization with functional consequence shown in single lab, but direct in vitro reconstitution of ATM recruitment not performed","pmids":["16325375"],"is_preprint":false},{"year":2006,"finding":"Arg-155 and Arg-157 of CKIP-1 are required for interaction with actin capping protein (CP). CKIP-1 R155E/R157E mutants lose CP binding while retaining CK2 interaction, plasma membrane localization, and self-association, but fail to induce the cell morphology and actin cytoskeleton changes characteristic of wild-type CKIP-1, demonstrating that the CKIP-1–CP interaction is required for these cellular effects.","method":"Peptide walking arrays, site-directed mutagenesis, co-immunoprecipitation, tetracycline-inducible expression, immunofluorescence, phalloidin staining","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — active-site/interface mutagenesis with clear structure-function dissection, replicated in osteosarcoma cell lines","pmids":["16987810"],"is_preprint":false},{"year":2006,"finding":"CKIP-1 interacts with the IFN-induced proteins IFP35 and Nmi via their NID domains; CKIP-1 forms homodimers and homotrimers in vivo. CKIP-1 destabilizes IFP35 by inhibiting the IFP35–Nmi interaction, with the Nmi:CKIP-1 ratio determining IFP35 stability and thereby modulating cytokine signaling.","method":"Co-immunoprecipitation, yeast two-hybrid, domain-mapping, overexpression and knockdown with immunoblot","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP and domain mapping, single lab, two orthogonal methods","pmids":["17197158"],"is_preprint":false},{"year":2008,"finding":"CKIP-1 specifically interacts with the linker region between the WW domains of Smurf1 (but not Smurf2), augments Smurf1 E3 ligase activity, and enhances Smurf1 affinity for its substrates, promoting ubiquitylation. CKIP-1-deficient mice show age-dependent increase in bone mass due to decreased Smurf1 activity, establishing CKIP-1 as the first auxiliary factor to activate a HECT-type E3 ligase.","method":"Co-immunoprecipitation, in vitro ubiquitylation assay, domain-mapping, CKIP-1 knockout mouse phenotyping, bone histomorphometry","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro E3 ligase activity assay with mutagenesis/domain mapping, KO mouse with bone phenotype; replicated across multiple subsequent labs","pmids":["18641638"],"is_preprint":false},{"year":2010,"finding":"The N-terminal PH domain of CKIP-1 contains basic residues and a serine-rich motif that control nuclear versus plasma membrane localization; when isolated, the PH domain localizes predominantly to the nucleus. The C-terminal region of CKIP-1 acts as an auto-inhibitory domain that counteracts PH domain-mediated nuclear localization, coordinating the nucleus-plasma membrane shuttling of CKIP-1.","method":"Deletion and point-mutant constructs, fluorescence microscopy/localization assay in cells","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain deletion and mutagenesis with direct imaging, single lab","pmids":["20171213"],"is_preprint":false},{"year":2012,"finding":"CKIP-1 inhibits cardiac hypertrophy by interacting with HDAC4 (GST pull-down and co-IP confirmed), recruits the catalytic subunit of PP2A to HDAC4, enhances HDAC4 dephosphorylation, and thereby synergistically inhibits MEF2C transcriptional activity. CKIP-1 KO mice develop spontaneous cardiac hypertrophy; cardiac-specific CKIP-1 transgenic mice are resistant to pressure-overload hypertrophy.","method":"GST pull-down, co-immunoprecipitation, CKIP-1 KO and transgenic mouse models, echocardiography, histology, phosphorylation immunoblotting","journal":"Circulation","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — GST pull-down plus co-IP plus KO and transgenic mouse phenotypes; multiple orthogonal methods in a single study","pmids":["23151343"],"is_preprint":false},{"year":2012,"finding":"CKIP-1 depletion severely impairs myoblast fusion in C2C12 cells in vitro and in zebrafish fast-twitch muscle in vivo. CKIP-1 binds the ARPC1 subunit of the Arp2/3 complex; through its PH domain binding to plasma membrane phosphoinositides, CKIP-1 recruits Arp2/3 to the plasma membrane, regulating cortical actin, lamellipodia formation, and myoblast elongation/fusion.","method":"siRNA knockdown, zebrafish morpholino knockdown, co-immunoprecipitation, immunofluorescence, live imaging, PH domain binding assay","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal interaction data, in vitro and in vivo (zebrafish) loss-of-function with defined cellular phenotype; two model systems","pmids":["22553210"],"is_preprint":false},{"year":2013,"finding":"In colon cancer cells, CKIP-1 suppresses Smurf1 protein levels by two mechanisms: suppressing PI3K/Akt/mTOR-dependent translational upregulation of Smurf1 and enhancing Smurf1 autodegradation. CKIP-1 overexpression inhibits cell growth and migration in a Smurf1-dependent manner, and CKIP-1 downregulation correlates with Smurf1 upregulation in colon carcinogenesis.","method":"Overexpression and knockdown in HCT116 and SW480 cells, rapamycin treatment, in vivo tumor formation assay, immunoblotting","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss- and gain-of-function with defined pathway placement (mTOR-Smurf1 axis), single lab","pmids":["23995790"],"is_preprint":false},{"year":2014,"finding":"CKIP-1 inhibits macrophage proliferation by interacting with TRAF6, a K63-ubiquitin E3 ligase required for Akt plasma membrane recruitment. In resting macrophages, GSK3β phosphorylates CKIP-1 at Ser-342, triggering its polyubiquitination and proteasomal degradation. Upon M-CSF stimulation, Akt inactivates GSK3β, stabilizing CKIP-1, which then terminates TRAF6-mediated Akt activation. CKIP-1-deficient mice develop splenomegaly and myeloproliferation.","method":"Co-immunoprecipitation, phosphorylation mutagenesis, ubiquitination assay, CKIP-1 KO mouse phenotyping, flow cytometry, immunoblotting","journal":"Cell research","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple biochemical assays (co-IP, ubiquitination, phospho-mutagenesis) with KO mouse phenotype; multiple orthogonal methods","pmids":["24777252"],"is_preprint":false},{"year":2014,"finding":"CKIP-1 interacts with HDAC1 in the nucleus and enhances HDAC1-mediated repression of the C/EBPα promoter, thereby suppressing adipogenesis in mesenchymal stem cells. MSCs from CKIP-1-deficient mice show enhanced adipogenesis; CKIP-1-deficient mice on a high-fat diet accumulate more white adipose tissue.","method":"Co-immunoprecipitation, chromatin immunoprecipitation (inferred from context), CKIP-1 KO mouse model, differentiation assay, immunoblotting","journal":"Journal of molecular cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus KO mouse phenotype, single lab","pmids":["25240053"],"is_preprint":false},{"year":2014,"finding":"CKIP-1 is an intrinsic negative regulator of T-cell NF-κB activation: CKIP-1 interacts with CARMA1 via its PH domain and competes with PKCθ for CARMA1 association, suppressing the PKCθ–CBM–NF-κB signaling axis. CKIP-1 represses NF-κB in unstimulated cells; CD3/CD28 costimulation causes CKIP-1 dissociation from lipid rafts, relieving inhibition.","method":"Cell-based mutagenesis/complementation screen, co-immunoprecipitation, lipid raft fractionation, NF-κB reporter assay, PH domain deletion mutants","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP, domain mapping, reporter assay, single lab with multiple orthogonal methods","pmids":["24465689"],"is_preprint":false},{"year":2015,"finding":"CKIP-1 mediates the activation of PAK1 at the plasma membrane: upon EGF stimulation, CK2α, CKIP-1, and PAK1 co-translocate to membrane ruffles in a PI3K-dependent manner, where CKIP-1 bridges the interaction between CK2α and PAK1, facilitating CK2-mediated phosphorylation of PAK1 at Ser-223 and downstream phosphorylation of p41-Arc. CKIP-1 knockdown or PI3K inhibition suppresses PAK1-mediated cell migration and invasion.","method":"Co-immunoprecipitation, subcellular fractionation/imaging, PI3K inhibitor treatment, siRNA knockdown, migration/invasion assay, phospho-specific immunoblotting","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP with localization and functional (migration) readout, single lab","pmids":["26160174"],"is_preprint":false},{"year":2017,"finding":"PLEKHO1/CKIP-1 expression increases in bone with age in both human fracture patients and aging rodents. Osteoblast-specific loss of Plekho1 promotes Smad-dependent BMP signaling (increased pSmad1/5/8) and alleviates age-related bone formation reduction; osteoblast-specific Smad1 overexpression is counteracted by Plekho1 overexpression, confirming epistatic relationship. Osteoblast-targeted Plekho1 siRNA enhances BMP signaling and bone formation in aging rodents.","method":"Conditional/osteoblast-specific knockout and overexpression mouse models, bone histomorphometry, pSmad1/5/8 immunoblotting, BMP reporter assay, siRNA treatment in vivo","journal":"Aging cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis in vivo (osteoblast-specific KO + overexpression rescues), pharmacological siRNA, replicated across multiple animal ages and models","pmids":["28083909"],"is_preprint":false},{"year":2017,"finding":"CKIP-1 overexpression decreases K48-linked polyubiquitination of Nrf2 and increases K63-linked polyubiquitination of Nrf2, while increasing K48-linked polyubiquitination of Keap1, thereby activating the Nrf2/ARE pathway. CKIP-1 promotes degradation of Smurf1 through increased Smurf1 ubiquitination; Smurf1 in turn ubiquitinates Nrf2 for K48-linked degradation. This axis protects against high glucose-induced renal fibrosis in glomerular mesangial cells.","method":"Overexpression, knockdown (siRNA/adenovirus), ubiquitination assay (K48/K63 linkage-specific), Nrf2 nuclear accumulation and reporter assay, CKIP-1 KO mice","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ubiquitination linkage assays and reporter with genetic manipulation, single lab","pmids":["29248720"],"is_preprint":false},{"year":2017,"finding":"CKIP-1 interacts with JNK1 in vitro; CKIP-1 deficiency in mice fed a high-fat diet leads to increased JNK1 phosphorylation and downstream IRS-1 phosphorylation, aggravating hepatic lipid accumulation.","method":"In vitro pull-down/co-IP, CKIP-1 KO mouse model, immunoblotting for phospho-JNK1 and phospho-IRS-1","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro interaction plus KO mouse phenotype, single lab","pmids":["28351752"],"is_preprint":false},{"year":2018,"finding":"CKIP-1 (CKIP-1/Smurf1 axis) is required for neural crest induction in chick embryos: CKIP-1 knockdown at the neural plate border suppresses pSmad1/5/8 and BMP reporter output, causing neural crest loss without affecting Wnt signaling. Epistasis experiments show CKIP-1 rescues Smurf1 overexpression-mediated neural crest loss, establishing that CKIP-1 suppresses Smurf1-mediated Smad degradation to maintain intermediate BMP levels required for neural crest induction.","method":"Morpholino/siRNA knockdown in chick embryo, Smurf1 overexpression, BMP reporter assay, pSmad1/5/8 immunostaining, epistasis rescue experiments","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo epistasis in two genetic backgrounds (KD + OE rescue), multiple reporters, clean mechanistic dissection in a rigorous developmental model","pmids":["29949573"],"is_preprint":false},{"year":2019,"finding":"CKIP-1 interacts with the proteasome activator REGγ and targets the transcription factor Oct-1 for proteasomal degradation in a REGγ-dependent manner, thereby suppressing Oct-1-driven transcription of the scavenger receptor LOX-1. Ckip-1-deficient mice show increased LOX-1 expression, enhanced foam cell formation, and accelerated atherosclerosis; bone marrow transplantation demonstrates the effect is hematopoietic cell-autonomous.","method":"Co-immunoprecipitation, ubiquitination/degradation assay, luciferase reporter for LOX-1 promoter, CKIP-1 KO mouse with atherosclerosis model, bone marrow transplantation","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, promoter reporter, KO mouse with bone marrow transplant to establish cell autonomy; multiple orthogonal methods","pmids":["30683852"],"is_preprint":false},{"year":2020,"finding":"CKIP-1 acts downstream of Cx43 to activate the Nrf2 signaling pathway: Cx43 interacts with CKIP-1 (confirmed by co-IP and immunofluorescence), and Cx43-mediated Nrf2 activation requires CKIP-1. The Cx43 carboxyl terminus (CT) domain regulates CKIP-1 expression and the CKIP-1–Nrf2 interaction. High glucose treatment weakens Cx43–CKIP-1 interaction.","method":"Co-immunoprecipitation, immunofluorescence, siRNA knockdown, Cx43 overexpression in CKIP-1 KO mice, Nrf2 reporter assay","journal":"Pharmacological research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus KO mouse rescue experiment, single lab","pmids":["33276097"],"is_preprint":false},{"year":2022,"finding":"Activated Src kinase interacts with CKIP-1 at Lys252, promotes c-Cbl binding to CKIP-1 (via c-Cbl phosphorylation by Src), and thereby increases K48-linked polyubiquitination and proteasomal degradation of CKIP-1. This mechanism accounts for CKIP-1 downregulation in high-glucose-induced glomerular mesangial cells and diabetic kidneys.","method":"Co-immunoprecipitation, site-directed mutagenesis (Lys252), ubiquitination assay (K48-specific), CKIP-1 KO mouse, immunoblotting","journal":"Biochemical pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP with mutagenesis, ubiquitination assay, and KO mouse, single lab","pmids":["36347273"],"is_preprint":false},{"year":2024,"finding":"CKIP-1 mediates translocation of CK2 from the nucleus to the cytoplasm in cardiomyocytes, increasing SAP97 phosphorylation by CK2, which enhances Nav1.5 and Kir2.1 channel complex formation and ion current activity. CK2 phosphorylates SAP97 in vitro.","method":"In vitro kinase assay (CK2 phosphorylation of SAP97), transfection-driven CKIP-1 overexpression, subcellular fractionation, whole-cell patch-clamp recording for Nav1.5 and Kir2.1 currents","journal":"Journal of biochemical and molecular toxicology","confidence":"Medium","confidence_rationale":"Tier 1–2 / Weak — in vitro kinase assay plus electrophysiology, single lab, single paper","pmids":["39056188"],"is_preprint":false},{"year":2024,"finding":"VHL enhances CKIP-1 degradation through the ubiquitin-proteasome system. A small-molecule ligand C77 was identified by DNA-encoded library screening that binds CKIP-1 both in vitro (Surface Plasmon Resonance) and in cells (CETSA), providing a basis for PROTAC-based CKIP-1 degradation.","method":"DNA-encoded library screening, Surface Plasmon Resonance (SPR), Cellular Thermal Shift Assay (CETSA), ubiquitination assay","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — SPR and CETSA confirm direct binding, VHL-mediated ubiquitination shown biochemically, single lab, limited functional follow-up","pmids":["39201556"],"is_preprint":false},{"year":2025,"finding":"ATF2 transcriptionally activates PLEKHO1 expression (validated by dual-luciferase reporter assay); PLEKHO1 directly binds NUS1 (confirmed by co-IP), and PLEKHO1 depletion restrains ccRCC progression via NUS1 regulation in vitro and in xenograft models.","method":"Dual-luciferase reporter assay, co-immunoprecipitation, siRNA knockdown, xenograft mouse model","journal":"Molecular carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay plus co-IP with in vivo xenograft validation, single lab","pmids":["39777695"],"is_preprint":false}],"current_model":"CKIP-1/PLEKHO1 is a PH domain-containing scaffold protein that localizes to the plasma membrane (via phosphoinositide binding) or nucleus (regulated by an auto-inhibitory C-terminal region and cell stress), where it integrates multiple signaling pathways: it activates Smurf1 E3 ligase activity by binding its WW-domain linker (promoting ubiquitination of Smad1/5 and suppressing BMP signaling in bone), recruits PP2A to HDAC4 to suppress cardiac hypertrophy, bridges CK2α to PAK1 and to actin capping protein to regulate actin dynamics and cell migration, inhibits TRAF6-mediated Akt activation to control macrophage proliferation, directs Oct-1 for REGγ-dependent proteasomal degradation to suppress LOX-1 transcription in macrophages, competes with PKCθ for CARMA1 binding to dampen NF-κB in T cells, and promotes Nrf2/ARE antioxidant signaling by reducing Keap1 and Smurf1-mediated Nrf2 degradation; collectively, loss of CKIP-1 results in impaired bone formation, cardiac hypertrophy, foam cell accumulation, myeloproliferation, and increased susceptibility to oxidative injury across multiple tissues."},"narrative":{"mechanistic_narrative":"PLEKHO1 (CKIP-1) is a pleckstrin homology (PH) domain scaffold protein that shuttles between the plasma membrane and nucleus to integrate kinase, ubiquitin-ligase, and cytoskeletal signaling across bone, muscle, immune, cardiac, and metabolic tissues [PMID:10799509, PMID:14729969, PMID:20171213]. Its PH domain binds phosphoinositides (PI3-phosphate) and directs PI3K-dependent membrane translocation, while basic and serine-rich motifs in the PH domain drive nuclear import that is counteracted by an auto-inhibitory C-terminal region [PMID:14729969, PMID:20171213]. At the membrane it organizes actin dynamics: identified originally through its selective binding to CK2α [PMID:10799509], CKIP-1 bridges CK2α to actin capping protein subunits CPα/CPβ and to PAK1, and recruits the Arp2/3 complex via ARPC1, thereby controlling barbed-end capping, lamellipodia formation, cell migration, and myoblast fusion [PMID:15831458, PMID:16987810, PMID:22553210, PMID:26160174]. A second major function is regulation of the HECT E3 ligase Smurf1: CKIP-1 binds the inter-WW linker of Smurf1 to augment its ligase activity toward Smad1/5, and loss of CKIP-1 elevates BMP/Smad signaling, with genetic epistasis establishing this axis as a controller of age-related bone formation and neural crest induction [PMID:18641638, PMID:28083909, PMID:29949573]. CKIP-1 further acts as a negative regulator of multiple signaling outputs by scaffolding effector enzymes onto their substrates—recruiting PP2A to HDAC4 to dephosphorylate it and suppress MEF2C-driven cardiac hypertrophy [PMID:23151343], directing Oct-1 to REGγ-dependent proteasomal degradation to limit LOX-1 transcription and atherosclerotic foam-cell formation [PMID:30683852], competing with PKCθ for CARMA1 to dampen T-cell NF-κB [PMID:24465689], and terminating TRAF6-mediated Akt activation to restrain macrophage proliferation [PMID:24777252]. CKIP-1 abundance is itself tightly controlled by ubiquitin-dependent degradation through GSK3β-primed, Src/c-Cbl-, and VHL-directed pathways [PMID:24777252, PMID:36347273, PMID:39201556].","teleology":[{"year":2000,"claim":"Establishing CKIP-1 as a dedicated CK2α partner with dual membrane/nuclear localization defined it as a kinase-associated scaffold rather than a freely diffusing protein.","evidence":"Yeast two-hybrid, reciprocal co-IP, and EGFP imaging with PH-domain deletion","pmids":["10799509"],"confidence":"High","gaps":["Functional consequence of CK2α binding not yet defined","No substrate or pathway placement at this stage"]},{"year":2004,"claim":"Showing PH-domain binding to PI3-phosphate and PI3K-dependent membrane translocation placed CKIP-1 within PI3K signaling and linked it to muscle differentiation.","evidence":"PI3K inhibitor/construct manipulation, RNAi, and fusion assays in C2C12 myoblasts","pmids":["14729969"],"confidence":"High","gaps":["Membrane effectors downstream of recruitment not identified here","Mechanism connecting localization to myogenin expression unresolved"]},{"year":2005,"claim":"Identifying actin capping protein as a partner and CK2 phosphorylation of CPα connected CKIP-1 to direct regulation of actin barbed-end dynamics.","evidence":"TAP-MS, co-IP, barbed-end capping assay, and in vitro kinase assay","pmids":["15831458"],"confidence":"High","gaps":["Interface residues for CP binding not yet mapped","In vivo relevance to migration not yet tested"]},{"year":2005,"claim":"Demonstrating caspase-3 cleavage, nuclear relocalization, and AP-1 repression revealed a stress-regulated nuclear function for CKIP-1 in apoptosis.","evidence":"Caspase cleavage assay, fractionation, AP-1 reporter, and RNAi","pmids":["15706351"],"confidence":"High","gaps":["Direct mechanism of AP-1 repression by cleavage fragments unclear","Physiological apoptotic context untested"]},{"year":2005,"claim":"Linking membrane-bound CKIP-1 to ATM recruitment and p53 stabilization extended its scaffold role into the DNA-damage/p53 axis.","evidence":"Co-IP, fractionation, cycloheximide chase, and phospho-p53 immunoblotting","pmids":["16325375"],"confidence":"Medium","gaps":["No in vitro reconstitution of ATM recruitment","Single-lab observation without genetic confirmation"]},{"year":2006,"claim":"Mapping the CP-binding interface to Arg-155/Arg-157 separated CKIP-1's actin-remodeling function from its CK2 binding and membrane targeting.","evidence":"Peptide-walking arrays, point mutagenesis, inducible expression, and phalloidin staining","pmids":["16987810"],"confidence":"High","gaps":["Quantitative contribution of CP versus Arp2/3 to morphology not parsed","No structural model of the interface"]},{"year":2006,"claim":"Showing CKIP-1 destabilizes IFP35 by disrupting the IFP35–Nmi interaction added a stoichiometry-dependent role in cytokine signaling and confirmed self-oligomerization.","evidence":"Reciprocal co-IP, yeast two-hybrid, and domain mapping","pmids":["17197158"],"confidence":"Medium","gaps":["Cellular cytokine readouts not directly measured","Single-lab interaction data"]},{"year":2008,"claim":"Identifying CKIP-1 as the first activator of a HECT E3 ligase (Smurf1) and showing increased bone mass in knockouts defined its central role in BMP/bone regulation.","evidence":"Co-IP, in vitro ubiquitylation, domain mapping, and KO mouse histomorphometry","pmids":["18641638"],"confidence":"High","gaps":["Structural basis of WW-linker binding not resolved","Whether Smurf1 activation extends to all Smurf1 substrates unclear"]},{"year":2010,"claim":"Defining a PH-domain nuclear-targeting motif opposed by a C-terminal auto-inhibitory region explained how CKIP-1 partitions between membrane and nuclear pools.","evidence":"Deletion/point-mutant localization imaging","pmids":["20171213"],"confidence":"Medium","gaps":["Signals that toggle auto-inhibition in vivo not identified","No interacting nuclear import machinery defined"]},{"year":2012,"claim":"Showing CKIP-1 recruits PP2A to HDAC4 to suppress MEF2C and that knockouts develop hypertrophy established a protective cardiac signaling role.","evidence":"GST pull-down, co-IP, and KO plus transgenic mouse hypertrophy models","pmids":["23151343"],"confidence":"High","gaps":["How CKIP-1 selects HDAC4 over other substrates unclear","Membrane-versus-nuclear pool responsible not dissected"]},{"year":2012,"claim":"Demonstrating PH-domain-mediated recruitment of Arp2/3 (via ARPC1) to the membrane connected CKIP-1's phosphoinositide binding to cortical actin and myoblast fusion in two model systems.","evidence":"siRNA and zebrafish morpholino knockdown, co-IP, live imaging, and PH-domain binding assays","pmids":["22553210"],"confidence":"High","gaps":["Coordination between CP and Arp2/3 binding not resolved","Direct ARPC1 binding interface unmapped"]},{"year":2013,"claim":"Showing CKIP-1 suppresses Smurf1 levels via mTOR-dependent translation and autodegradation extended the CKIP-1–Smurf1 axis into tumor growth and migration control.","evidence":"Gain/loss of function in colon cancer lines, rapamycin treatment, and xenograft assays","pmids":["23995790"],"confidence":"Medium","gaps":["Reconciliation with Smurf1 activation reported elsewhere not addressed","Single tumor type"]},{"year":2014,"claim":"Defining the TRAF6 interaction and GSK3β/Ser-342-primed degradation of CKIP-1 established a feedback loop terminating M-CSF–driven Akt activation and restraining myeloproliferation.","evidence":"Co-IP, phospho-mutagenesis, ubiquitination assay, and KO mouse phenotyping","pmids":["24777252"],"confidence":"High","gaps":["Ubiquitin ligase acting on phosphorylated CKIP-1 not identified","Direct effect on TRAF6 catalytic activity unresolved"]},{"year":2014,"claim":"Showing nuclear CKIP-1 enhances HDAC1 repression of the C/EBPα promoter assigned it a transcriptional role suppressing adipogenesis.","evidence":"Co-IP, ChIP, KO mouse differentiation and high-fat-diet assays","pmids":["25240053"],"confidence":"Medium","gaps":["Direct CKIP-1 DNA contact versus HDAC1 bridging unclear","Single-lab mechanism"]},{"year":2014,"claim":"Demonstrating PH-domain competition with PKCθ for CARMA1 placed CKIP-1 as an intrinsic brake on T-cell NF-κB signaling controlled by lipid-raft dynamics.","evidence":"Complementation screen, co-IP, raft fractionation, and NF-κB reporter","pmids":["24465689"],"confidence":"Medium","gaps":["In vivo T-cell phenotype not established","Stoichiometry of competition not quantified"]},{"year":2015,"claim":"Showing EGF-induced co-translocation of CK2α–CKIP-1–PAK1 to ruffles, with CKIP-1 bridging CK2-mediated PAK1 Ser-223 phosphorylation, linked the scaffold to migration/invasion.","evidence":"Co-IP, fractionation/imaging, PI3K inhibition, knockdown, and migration assays","pmids":["26160174"],"confidence":"Medium","gaps":["Direct versus indirect PAK1 phosphorylation effects on motility not separated","Single-lab finding"]},{"year":2017,"claim":"In vivo osteoblast-specific epistasis showed age-rising PLEKHO1 suppresses BMP/Smad signaling, identifying it as a driver of age-related bone loss and a therapeutic siRNA target.","evidence":"Conditional KO/overexpression mice, histomorphometry, pSmad immunoblotting, and in vivo siRNA","pmids":["28083909"],"confidence":"High","gaps":["Trigger for age-dependent PLEKHO1 upregulation unknown","Translation to human bone disease untested"]},{"year":2017,"claim":"Defining linkage-specific Nrf2/Keap1/Smurf1 ubiquitination changes placed CKIP-1 as an activator of Nrf2/ARE antioxidant defense protecting against renal fibrosis.","evidence":"K48/K63 ubiquitination assays, Nrf2 reporter, and KO mice","pmids":["29248720"],"confidence":"Medium","gaps":["Direct enzymatic basis for altered ubiquitin linkages unclear","Single-lab mechanism"]},{"year":2017,"claim":"Identifying a CKIP-1–JNK1 interaction tied CKIP-1 loss to enhanced JNK1/IRS-1 phosphorylation and hepatic lipid accumulation.","evidence":"In vitro pull-down/co-IP and KO mouse high-fat-diet phenotyping","pmids":["28351752"],"confidence":"Medium","gaps":["Whether CKIP-1 directly inhibits JNK1 activity unresolved","Single-lab observation"]},{"year":2018,"claim":"In vivo epistasis in chick embryos showed CKIP-1 restrains Smurf1-mediated Smad degradation to maintain BMP levels required for neural crest induction, extending the bone axis to development.","evidence":"Morpholino/siRNA knockdown, Smurf1 overexpression rescue, BMP reporter, and pSmad immunostaining","pmids":["29949573"],"confidence":"High","gaps":["Spatial control of CKIP-1 at the neural plate border not defined","Whether other Smurf1 substrates contribute unclear"]},{"year":2019,"claim":"Demonstrating CKIP-1–REGγ-dependent degradation of Oct-1 to suppress LOX-1 established a hematopoietic-cell-autonomous anti-atherosclerotic function.","evidence":"Co-IP, degradation assay, LOX-1 promoter reporter, KO mouse atherosclerosis model, and bone marrow transplant","pmids":["30683852"],"confidence":"High","gaps":["Whether REGγ recruitment is direct or scaffolded unclear","Generality of Oct-1 targeting beyond macrophages untested"]},{"year":2020,"claim":"Placing CKIP-1 downstream of Cx43 in Nrf2 activation linked gap-junction signaling to CKIP-1–dependent antioxidant defense.","evidence":"Co-IP, immunofluorescence, knockdown, Cx43 overexpression in KO mice, and Nrf2 reporter","pmids":["33276097"],"confidence":"Medium","gaps":["How Cx43 CT regulates CKIP-1 expression mechanistically unclear","Single-lab finding"]},{"year":2022,"claim":"Defining Src-driven, c-Cbl-mediated K48 ubiquitination at Lys252 explained CKIP-1 downregulation in diabetic kidney, adding a second degradation route beyond GSK3β priming.","evidence":"Co-IP, Lys252 mutagenesis, K48-specific ubiquitination assay, and KO mice","pmids":["36347273"],"confidence":"Medium","gaps":["Relative contribution of Src/c-Cbl versus other 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medicine","url":"https://pubmed.ncbi.nlm.nih.gov/34498492","citation_count":4,"is_preprint":false},{"pmid":"35929282","id":"PMC_35929282","title":"A novel CKIP-1 SiRNA slow-release coating on porous titanium implants for enhanced osseointegration.","date":"2022","source":"Biomaterials advances","url":"https://pubmed.ncbi.nlm.nih.gov/35929282","citation_count":4,"is_preprint":false},{"pmid":"28245404","id":"PMC_28245404","title":"[MicroRNA-20a Promotes Osteogenic Differentiation of C3H/10T1/2 Cells through Regulating CKIP-1 Expression].","date":"2017","source":"Zhongguo shi yan xue ye xue za zhi","url":"https://pubmed.ncbi.nlm.nih.gov/28245404","citation_count":4,"is_preprint":false},{"pmid":"38885017","id":"PMC_38885017","title":"CKIP-1-Loaded Cartilage-Affinitive Nanoliposomes Reverse Osteoarthritis by Restoring Chondrocyte Homeostasis.","date":"2024","source":"ACS biomaterials science & engineering","url":"https://pubmed.ncbi.nlm.nih.gov/38885017","citation_count":3,"is_preprint":false},{"pmid":"37483640","id":"PMC_37483640","title":"CKIP-1 mediates P. gingivalis-suppressed osteogenic/cementogenic differentiation of periodontal ligament cells partially via p38 signaling pathway.","date":"2023","source":"Journal of oral microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/37483640","citation_count":2,"is_preprint":false},{"pmid":"33732315","id":"PMC_33732315","title":"Ckip-1 regulates C3H10T1/2 mesenchymal cell proliferation and osteogenic differentiation via Lrp5.","date":"2021","source":"Experimental and therapeutic medicine","url":"https://pubmed.ncbi.nlm.nih.gov/33732315","citation_count":2,"is_preprint":false},{"pmid":"39201556","id":"PMC_39201556","title":"The Discovery of a Specific CKIP-1 Ligand for the Potential Treatment of Disuse Osteoporosis.","date":"2024","source":"International journal of molecular 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Section F, Structural biology and crystallization communications","url":"https://pubmed.ncbi.nlm.nih.gov/23519814","citation_count":2,"is_preprint":false},{"pmid":"39470944","id":"PMC_39470944","title":"CKIP-1 inhibits M2 macrophage polarization to suppress the progression of gastric cancer by inactivating JAK/STAT3 signaling.","date":"2024","source":"Cell biochemistry and biophysics","url":"https://pubmed.ncbi.nlm.nih.gov/39470944","citation_count":2,"is_preprint":false},{"pmid":"38593570","id":"PMC_38593570","title":"Paeonol can improve hypoxic-induced H9c2 cells injury and ion channel activity by up-regulating the expression of CKIP-1.","date":"2024","source":"Tissue & cell","url":"https://pubmed.ncbi.nlm.nih.gov/38593570","citation_count":2,"is_preprint":false},{"pmid":"36631036","id":"PMC_36631036","title":"[Effect of CKIP-1 on hepatocyte apoptosis in nonalcoholic fatty liver disease].","date":"2023","source":"Zhonghua nei ke za zhi","url":"https://pubmed.ncbi.nlm.nih.gov/36631036","citation_count":1,"is_preprint":false},{"pmid":"37668684","id":"PMC_37668684","title":"Associations of CKIP-1 and LOX-1 polymorphisms with the risk of type 2 diabetes mellitus with hypertension among Chinese adults.","date":"2023","source":"Acta diabetologica","url":"https://pubmed.ncbi.nlm.nih.gov/37668684","citation_count":1,"is_preprint":false},{"pmid":"39777695","id":"PMC_39777695","title":"The Transcription Factor ATF2 Accelerates Clear Cell Renal Cell Carcinoma Progression Through Activating the PLEKHO1/NUS1 Pathway.","date":"2025","source":"Molecular carcinogenesis","url":"https://pubmed.ncbi.nlm.nih.gov/39777695","citation_count":1,"is_preprint":false},{"pmid":"39056188","id":"PMC_39056188","title":"CKIP-1 mediates CK2 translocation to regulate Nav1.5 and Kir2.1 channel complexes in cardiomyocytes.","date":"2024","source":"Journal of biochemical and molecular toxicology","url":"https://pubmed.ncbi.nlm.nih.gov/39056188","citation_count":0,"is_preprint":false},{"pmid":"39956470","id":"PMC_39956470","title":"MicroRNA-6069 ASO inhibits the growth of hepatocellular carcinoma by PLEKHO1.","date":"2025","source":"Biochimica et biophysica acta. 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EGFP-CKIP-1 localizes to the nucleus and plasma membrane, with plasma membrane localization dependent on the N-terminal pleckstrin homology (PH) domain.\",\n      \"method\": \"Yeast two-hybrid, in vitro binding assay, co-immunoprecipitation, EGFP fusion live-cell imaging, deletion analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, yeast two-hybrid, in vitro binding, and localization experiments in a single study; foundational paper replicated by multiple subsequent labs\",\n      \"pmids\": [\"10799509\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"CKIP-1 binds phosphatidylinositol 3-phosphate through its PH domain and translocates to the plasma membrane in a PI3K-dependent manner. In C2C12 myoblasts, CKIP-1 overexpression promotes proliferation and then stimulates myogenin expression and cell fusion; siRNA silencing of CKIP-1 abolishes proliferation and delays myogenin expression, implicating CKIP-1 as a component of PI3K signaling in muscle differentiation.\",\n      \"method\": \"PI3K inhibitors (LY294002, wortmannin), active/dominant-negative PI3K constructs, RNA interference, immunofluorescence, cell fusion assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (pharmacological inhibition, genetic manipulation, RNAi) in a single study, replicated by myoblast fusion paper (PMID:22553210)\",\n      \"pmids\": [\"14729969\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"CKIP-1 overexpression causes distinct changes in cell morphology and increases F-actin levels. Tandem affinity purification and mass spectrometry identified actin capping protein subunits CPα and CPβ as CKIP-1 interaction partners; co-immunoprecipitation and colocalization confirmed the interaction. CKIP-1 and CK2 together inhibit capping protein activity at barbed ends of actin filaments. CK2 phosphorylates Ser9 of CPα in vitro and in vivo.\",\n      \"method\": \"Tandem affinity purification, mass spectrometry, co-immunoprecipitation, immunofluorescence, quantitative phalloidin binding, in vitro kinase assay, CK2 inhibitor treatment\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro kinase assay for CPα phosphorylation, barbed-end capping assay, TAP-MS identification confirmed by co-IP and colocalization; replicated by follow-up mutagenesis paper (PMID:16987810)\",\n      \"pmids\": [\"15831458\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"CKIP-1 functions as a plasma membrane-bound AP-1 regulator. During apoptosis, CKIP-1 is cleaved by caspase-3 and translocates from plasma membrane to cytoplasm and then nucleus; C-terminal cleavage fragments strongly repress AP-1 transcriptional activity. CKIP-1 overexpression promotes apoptosis via a positive feedback loop with caspase-3; RNAi knockdown of CKIP-1 attenuates apoptosis sensitivity.\",\n      \"method\": \"Caspase-3 cleavage assay, subcellular fractionation and live imaging, AP-1 reporter assay, RNA interference, overexpression in cells\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (cleavage assay, localization, reporter, RNAi) in single study; finding replicated implicitly in subsequent apoptosis papers\",\n      \"pmids\": [\"15706351\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"CKIP-1 recruits nuclear ATM kinase partially to the plasma membrane through direct interaction with ATM; only the plasma membrane-localized CKIP-1 forms a complex with ATM. CKIP-1 overexpression prevents p53 degradation by increasing p53 Ser-15 phosphorylation, consistent with enhanced ATM activity toward p53.\",\n      \"method\": \"Co-immunoprecipitation, subcellular fractionation, immunofluorescence, cycloheximide chase assay, phospho-specific immunoblotting\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and localization with functional consequence shown in single lab, but direct in vitro reconstitution of ATM recruitment not performed\",\n      \"pmids\": [\"16325375\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Arg-155 and Arg-157 of CKIP-1 are required for interaction with actin capping protein (CP). CKIP-1 R155E/R157E mutants lose CP binding while retaining CK2 interaction, plasma membrane localization, and self-association, but fail to induce the cell morphology and actin cytoskeleton changes characteristic of wild-type CKIP-1, demonstrating that the CKIP-1–CP interaction is required for these cellular effects.\",\n      \"method\": \"Peptide walking arrays, site-directed mutagenesis, co-immunoprecipitation, tetracycline-inducible expression, immunofluorescence, phalloidin staining\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — active-site/interface mutagenesis with clear structure-function dissection, replicated in osteosarcoma cell lines\",\n      \"pmids\": [\"16987810\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CKIP-1 interacts with the IFN-induced proteins IFP35 and Nmi via their NID domains; CKIP-1 forms homodimers and homotrimers in vivo. CKIP-1 destabilizes IFP35 by inhibiting the IFP35–Nmi interaction, with the Nmi:CKIP-1 ratio determining IFP35 stability and thereby modulating cytokine signaling.\",\n      \"method\": \"Co-immunoprecipitation, yeast two-hybrid, domain-mapping, overexpression and knockdown with immunoblot\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP and domain mapping, single lab, two orthogonal methods\",\n      \"pmids\": [\"17197158\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"CKIP-1 specifically interacts with the linker region between the WW domains of Smurf1 (but not Smurf2), augments Smurf1 E3 ligase activity, and enhances Smurf1 affinity for its substrates, promoting ubiquitylation. CKIP-1-deficient mice show age-dependent increase in bone mass due to decreased Smurf1 activity, establishing CKIP-1 as the first auxiliary factor to activate a HECT-type E3 ligase.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitylation assay, domain-mapping, CKIP-1 knockout mouse phenotyping, bone histomorphometry\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro E3 ligase activity assay with mutagenesis/domain mapping, KO mouse with bone phenotype; replicated across multiple subsequent labs\",\n      \"pmids\": [\"18641638\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The N-terminal PH domain of CKIP-1 contains basic residues and a serine-rich motif that control nuclear versus plasma membrane localization; when isolated, the PH domain localizes predominantly to the nucleus. The C-terminal region of CKIP-1 acts as an auto-inhibitory domain that counteracts PH domain-mediated nuclear localization, coordinating the nucleus-plasma membrane shuttling of CKIP-1.\",\n      \"method\": \"Deletion and point-mutant constructs, fluorescence microscopy/localization assay in cells\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain deletion and mutagenesis with direct imaging, single lab\",\n      \"pmids\": [\"20171213\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CKIP-1 inhibits cardiac hypertrophy by interacting with HDAC4 (GST pull-down and co-IP confirmed), recruits the catalytic subunit of PP2A to HDAC4, enhances HDAC4 dephosphorylation, and thereby synergistically inhibits MEF2C transcriptional activity. CKIP-1 KO mice develop spontaneous cardiac hypertrophy; cardiac-specific CKIP-1 transgenic mice are resistant to pressure-overload hypertrophy.\",\n      \"method\": \"GST pull-down, co-immunoprecipitation, CKIP-1 KO and transgenic mouse models, echocardiography, histology, phosphorylation immunoblotting\",\n      \"journal\": \"Circulation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — GST pull-down plus co-IP plus KO and transgenic mouse phenotypes; multiple orthogonal methods in a single study\",\n      \"pmids\": [\"23151343\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CKIP-1 depletion severely impairs myoblast fusion in C2C12 cells in vitro and in zebrafish fast-twitch muscle in vivo. CKIP-1 binds the ARPC1 subunit of the Arp2/3 complex; through its PH domain binding to plasma membrane phosphoinositides, CKIP-1 recruits Arp2/3 to the plasma membrane, regulating cortical actin, lamellipodia formation, and myoblast elongation/fusion.\",\n      \"method\": \"siRNA knockdown, zebrafish morpholino knockdown, co-immunoprecipitation, immunofluorescence, live imaging, PH domain binding assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal interaction data, in vitro and in vivo (zebrafish) loss-of-function with defined cellular phenotype; two model systems\",\n      \"pmids\": [\"22553210\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"In colon cancer cells, CKIP-1 suppresses Smurf1 protein levels by two mechanisms: suppressing PI3K/Akt/mTOR-dependent translational upregulation of Smurf1 and enhancing Smurf1 autodegradation. CKIP-1 overexpression inhibits cell growth and migration in a Smurf1-dependent manner, and CKIP-1 downregulation correlates with Smurf1 upregulation in colon carcinogenesis.\",\n      \"method\": \"Overexpression and knockdown in HCT116 and SW480 cells, rapamycin treatment, in vivo tumor formation assay, immunoblotting\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss- and gain-of-function with defined pathway placement (mTOR-Smurf1 axis), single lab\",\n      \"pmids\": [\"23995790\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CKIP-1 inhibits macrophage proliferation by interacting with TRAF6, a K63-ubiquitin E3 ligase required for Akt plasma membrane recruitment. In resting macrophages, GSK3β phosphorylates CKIP-1 at Ser-342, triggering its polyubiquitination and proteasomal degradation. Upon M-CSF stimulation, Akt inactivates GSK3β, stabilizing CKIP-1, which then terminates TRAF6-mediated Akt activation. CKIP-1-deficient mice develop splenomegaly and myeloproliferation.\",\n      \"method\": \"Co-immunoprecipitation, phosphorylation mutagenesis, ubiquitination assay, CKIP-1 KO mouse phenotyping, flow cytometry, immunoblotting\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple biochemical assays (co-IP, ubiquitination, phospho-mutagenesis) with KO mouse phenotype; multiple orthogonal methods\",\n      \"pmids\": [\"24777252\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CKIP-1 interacts with HDAC1 in the nucleus and enhances HDAC1-mediated repression of the C/EBPα promoter, thereby suppressing adipogenesis in mesenchymal stem cells. MSCs from CKIP-1-deficient mice show enhanced adipogenesis; CKIP-1-deficient mice on a high-fat diet accumulate more white adipose tissue.\",\n      \"method\": \"Co-immunoprecipitation, chromatin immunoprecipitation (inferred from context), CKIP-1 KO mouse model, differentiation assay, immunoblotting\",\n      \"journal\": \"Journal of molecular cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus KO mouse phenotype, single lab\",\n      \"pmids\": [\"25240053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CKIP-1 is an intrinsic negative regulator of T-cell NF-κB activation: CKIP-1 interacts with CARMA1 via its PH domain and competes with PKCθ for CARMA1 association, suppressing the PKCθ–CBM–NF-κB signaling axis. CKIP-1 represses NF-κB in unstimulated cells; CD3/CD28 costimulation causes CKIP-1 dissociation from lipid rafts, relieving inhibition.\",\n      \"method\": \"Cell-based mutagenesis/complementation screen, co-immunoprecipitation, lipid raft fractionation, NF-κB reporter assay, PH domain deletion mutants\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, domain mapping, reporter assay, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"24465689\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CKIP-1 mediates the activation of PAK1 at the plasma membrane: upon EGF stimulation, CK2α, CKIP-1, and PAK1 co-translocate to membrane ruffles in a PI3K-dependent manner, where CKIP-1 bridges the interaction between CK2α and PAK1, facilitating CK2-mediated phosphorylation of PAK1 at Ser-223 and downstream phosphorylation of p41-Arc. CKIP-1 knockdown or PI3K inhibition suppresses PAK1-mediated cell migration and invasion.\",\n      \"method\": \"Co-immunoprecipitation, subcellular fractionation/imaging, PI3K inhibitor treatment, siRNA knockdown, migration/invasion assay, phospho-specific immunoblotting\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP with localization and functional (migration) readout, single lab\",\n      \"pmids\": [\"26160174\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"PLEKHO1/CKIP-1 expression increases in bone with age in both human fracture patients and aging rodents. Osteoblast-specific loss of Plekho1 promotes Smad-dependent BMP signaling (increased pSmad1/5/8) and alleviates age-related bone formation reduction; osteoblast-specific Smad1 overexpression is counteracted by Plekho1 overexpression, confirming epistatic relationship. Osteoblast-targeted Plekho1 siRNA enhances BMP signaling and bone formation in aging rodents.\",\n      \"method\": \"Conditional/osteoblast-specific knockout and overexpression mouse models, bone histomorphometry, pSmad1/5/8 immunoblotting, BMP reporter assay, siRNA treatment in vivo\",\n      \"journal\": \"Aging cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis in vivo (osteoblast-specific KO + overexpression rescues), pharmacological siRNA, replicated across multiple animal ages and models\",\n      \"pmids\": [\"28083909\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CKIP-1 overexpression decreases K48-linked polyubiquitination of Nrf2 and increases K63-linked polyubiquitination of Nrf2, while increasing K48-linked polyubiquitination of Keap1, thereby activating the Nrf2/ARE pathway. CKIP-1 promotes degradation of Smurf1 through increased Smurf1 ubiquitination; Smurf1 in turn ubiquitinates Nrf2 for K48-linked degradation. This axis protects against high glucose-induced renal fibrosis in glomerular mesangial cells.\",\n      \"method\": \"Overexpression, knockdown (siRNA/adenovirus), ubiquitination assay (K48/K63 linkage-specific), Nrf2 nuclear accumulation and reporter assay, CKIP-1 KO mice\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ubiquitination linkage assays and reporter with genetic manipulation, single lab\",\n      \"pmids\": [\"29248720\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CKIP-1 interacts with JNK1 in vitro; CKIP-1 deficiency in mice fed a high-fat diet leads to increased JNK1 phosphorylation and downstream IRS-1 phosphorylation, aggravating hepatic lipid accumulation.\",\n      \"method\": \"In vitro pull-down/co-IP, CKIP-1 KO mouse model, immunoblotting for phospho-JNK1 and phospho-IRS-1\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro interaction plus KO mouse phenotype, single lab\",\n      \"pmids\": [\"28351752\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CKIP-1 (CKIP-1/Smurf1 axis) is required for neural crest induction in chick embryos: CKIP-1 knockdown at the neural plate border suppresses pSmad1/5/8 and BMP reporter output, causing neural crest loss without affecting Wnt signaling. Epistasis experiments show CKIP-1 rescues Smurf1 overexpression-mediated neural crest loss, establishing that CKIP-1 suppresses Smurf1-mediated Smad degradation to maintain intermediate BMP levels required for neural crest induction.\",\n      \"method\": \"Morpholino/siRNA knockdown in chick embryo, Smurf1 overexpression, BMP reporter assay, pSmad1/5/8 immunostaining, epistasis rescue experiments\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo epistasis in two genetic backgrounds (KD + OE rescue), multiple reporters, clean mechanistic dissection in a rigorous developmental model\",\n      \"pmids\": [\"29949573\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CKIP-1 interacts with the proteasome activator REGγ and targets the transcription factor Oct-1 for proteasomal degradation in a REGγ-dependent manner, thereby suppressing Oct-1-driven transcription of the scavenger receptor LOX-1. Ckip-1-deficient mice show increased LOX-1 expression, enhanced foam cell formation, and accelerated atherosclerosis; bone marrow transplantation demonstrates the effect is hematopoietic cell-autonomous.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination/degradation assay, luciferase reporter for LOX-1 promoter, CKIP-1 KO mouse with atherosclerosis model, bone marrow transplantation\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, promoter reporter, KO mouse with bone marrow transplant to establish cell autonomy; multiple orthogonal methods\",\n      \"pmids\": [\"30683852\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CKIP-1 acts downstream of Cx43 to activate the Nrf2 signaling pathway: Cx43 interacts with CKIP-1 (confirmed by co-IP and immunofluorescence), and Cx43-mediated Nrf2 activation requires CKIP-1. The Cx43 carboxyl terminus (CT) domain regulates CKIP-1 expression and the CKIP-1–Nrf2 interaction. High glucose treatment weakens Cx43–CKIP-1 interaction.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, siRNA knockdown, Cx43 overexpression in CKIP-1 KO mice, Nrf2 reporter assay\",\n      \"journal\": \"Pharmacological research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus KO mouse rescue experiment, single lab\",\n      \"pmids\": [\"33276097\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Activated Src kinase interacts with CKIP-1 at Lys252, promotes c-Cbl binding to CKIP-1 (via c-Cbl phosphorylation by Src), and thereby increases K48-linked polyubiquitination and proteasomal degradation of CKIP-1. This mechanism accounts for CKIP-1 downregulation in high-glucose-induced glomerular mesangial cells and diabetic kidneys.\",\n      \"method\": \"Co-immunoprecipitation, site-directed mutagenesis (Lys252), ubiquitination assay (K48-specific), CKIP-1 KO mouse, immunoblotting\",\n      \"journal\": \"Biochemical pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP with mutagenesis, ubiquitination assay, and KO mouse, single lab\",\n      \"pmids\": [\"36347273\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CKIP-1 mediates translocation of CK2 from the nucleus to the cytoplasm in cardiomyocytes, increasing SAP97 phosphorylation by CK2, which enhances Nav1.5 and Kir2.1 channel complex formation and ion current activity. CK2 phosphorylates SAP97 in vitro.\",\n      \"method\": \"In vitro kinase assay (CK2 phosphorylation of SAP97), transfection-driven CKIP-1 overexpression, subcellular fractionation, whole-cell patch-clamp recording for Nav1.5 and Kir2.1 currents\",\n      \"journal\": \"Journal of biochemical and molecular toxicology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Weak — in vitro kinase assay plus electrophysiology, single lab, single paper\",\n      \"pmids\": [\"39056188\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"VHL enhances CKIP-1 degradation through the ubiquitin-proteasome system. A small-molecule ligand C77 was identified by DNA-encoded library screening that binds CKIP-1 both in vitro (Surface Plasmon Resonance) and in cells (CETSA), providing a basis for PROTAC-based CKIP-1 degradation.\",\n      \"method\": \"DNA-encoded library screening, Surface Plasmon Resonance (SPR), Cellular Thermal Shift Assay (CETSA), ubiquitination assay\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — SPR and CETSA confirm direct binding, VHL-mediated ubiquitination shown biochemically, single lab, limited functional follow-up\",\n      \"pmids\": [\"39201556\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ATF2 transcriptionally activates PLEKHO1 expression (validated by dual-luciferase reporter assay); PLEKHO1 directly binds NUS1 (confirmed by co-IP), and PLEKHO1 depletion restrains ccRCC progression via NUS1 regulation in vitro and in xenograft models.\",\n      \"method\": \"Dual-luciferase reporter assay, co-immunoprecipitation, siRNA knockdown, xenograft mouse model\",\n      \"journal\": \"Molecular carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay plus co-IP with in vivo xenograft validation, single lab\",\n      \"pmids\": [\"39777695\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CKIP-1/PLEKHO1 is a PH domain-containing scaffold protein that localizes to the plasma membrane (via phosphoinositide binding) or nucleus (regulated by an auto-inhibitory C-terminal region and cell stress), where it integrates multiple signaling pathways: it activates Smurf1 E3 ligase activity by binding its WW-domain linker (promoting ubiquitination of Smad1/5 and suppressing BMP signaling in bone), recruits PP2A to HDAC4 to suppress cardiac hypertrophy, bridges CK2α to PAK1 and to actin capping protein to regulate actin dynamics and cell migration, inhibits TRAF6-mediated Akt activation to control macrophage proliferation, directs Oct-1 for REGγ-dependent proteasomal degradation to suppress LOX-1 transcription in macrophages, competes with PKCθ for CARMA1 binding to dampen NF-κB in T cells, and promotes Nrf2/ARE antioxidant signaling by reducing Keap1 and Smurf1-mediated Nrf2 degradation; collectively, loss of CKIP-1 results in impaired bone formation, cardiac hypertrophy, foam cell accumulation, myeloproliferation, and increased susceptibility to oxidative injury across multiple tissues.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PLEKHO1 (CKIP-1) is a pleckstrin homology (PH) domain scaffold protein that shuttles between the plasma membrane and nucleus to integrate kinase, ubiquitin-ligase, and cytoskeletal signaling across bone, muscle, immune, cardiac, and metabolic tissues [#0, #1, #8]. Its PH domain binds phosphoinositides (PI3-phosphate) and directs PI3K-dependent membrane translocation, while basic and serine-rich motifs in the PH domain drive nuclear import that is counteracted by an auto-inhibitory C-terminal region [#1, #8]. At the membrane it organizes actin dynamics: identified originally through its selective binding to CK2\\u03b1 [#0], CKIP-1 bridges CK2\\u03b1 to actin capping protein subunits CP\\u03b1/CP\\u03b2 and to PAK1, and recruits the Arp2/3 complex via ARPC1, thereby controlling barbed-end capping, lamellipodia formation, cell migration, and myoblast fusion [#2, #5, #10, #15]. A second major function is regulation of the HECT E3 ligase Smurf1: CKIP-1 binds the inter-WW linker of Smurf1 to augment its ligase activity toward Smad1/5, and loss of CKIP-1 elevates BMP/Smad signaling, with genetic epistasis establishing this axis as a controller of age-related bone formation and neural crest induction [#7, #16, #19]. CKIP-1 further acts as a negative regulator of multiple signaling outputs by scaffolding effector enzymes onto their substrates\\u2014recruiting PP2A to HDAC4 to dephosphorylate it and suppress MEF2C-driven cardiac hypertrophy [#9], directing Oct-1 to REG\\u03b3-dependent proteasomal degradation to limit LOX-1 transcription and atherosclerotic foam-cell formation [#20], competing with PKC\\u03b8 for CARMA1 to dampen T-cell NF-\\u03baB [#14], and terminating TRAF6-mediated Akt activation to restrain macrophage proliferation [#12]. CKIP-1 abundance is itself tightly controlled by ubiquitin-dependent degradation through GSK3\\u03b2-primed, Src/c-Cbl-, and VHL-directed pathways [#12, #22, #24].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Establishing CKIP-1 as a dedicated CK2\\u03b1 partner with dual membrane/nuclear localization defined it as a kinase-associated scaffold rather than a freely diffusing protein.\",\n      \"evidence\": \"Yeast two-hybrid, reciprocal co-IP, and EGFP imaging with PH-domain deletion\",\n      \"pmids\": [\"10799509\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of CK2\\u03b1 binding not yet defined\", \"No substrate or pathway placement at this stage\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Showing PH-domain binding to PI3-phosphate and PI3K-dependent membrane translocation placed CKIP-1 within PI3K signaling and linked it to muscle differentiation.\",\n      \"evidence\": \"PI3K inhibitor/construct manipulation, RNAi, and fusion assays in C2C12 myoblasts\",\n      \"pmids\": [\"14729969\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Membrane effectors downstream of recruitment not identified here\", \"Mechanism connecting localization to myogenin expression unresolved\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identifying actin capping protein as a partner and CK2 phosphorylation of CP\\u03b1 connected CKIP-1 to direct regulation of actin barbed-end dynamics.\",\n      \"evidence\": \"TAP-MS, co-IP, barbed-end capping assay, and in vitro kinase assay\",\n      \"pmids\": [\"15831458\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Interface residues for CP binding not yet mapped\", \"In vivo relevance to migration not yet tested\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Demonstrating caspase-3 cleavage, nuclear relocalization, and AP-1 repression revealed a stress-regulated nuclear function for CKIP-1 in apoptosis.\",\n      \"evidence\": \"Caspase cleavage assay, fractionation, AP-1 reporter, and RNAi\",\n      \"pmids\": [\"15706351\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct mechanism of AP-1 repression by cleavage fragments unclear\", \"Physiological apoptotic context untested\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Linking membrane-bound CKIP-1 to ATM recruitment and p53 stabilization extended its scaffold role into the DNA-damage/p53 axis.\",\n      \"evidence\": \"Co-IP, fractionation, cycloheximide chase, and phospho-p53 immunoblotting\",\n      \"pmids\": [\"16325375\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No in vitro reconstitution of ATM recruitment\", \"Single-lab observation without genetic confirmation\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Mapping the CP-binding interface to Arg-155/Arg-157 separated CKIP-1's actin-remodeling function from its CK2 binding and membrane targeting.\",\n      \"evidence\": \"Peptide-walking arrays, point mutagenesis, inducible expression, and phalloidin staining\",\n      \"pmids\": [\"16987810\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative contribution of CP versus Arp2/3 to morphology not parsed\", \"No structural model of the interface\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Showing CKIP-1 destabilizes IFP35 by disrupting the IFP35\\u2013Nmi interaction added a stoichiometry-dependent role in cytokine signaling and confirmed self-oligomerization.\",\n      \"evidence\": \"Reciprocal co-IP, yeast two-hybrid, and domain mapping\",\n      \"pmids\": [\"17197158\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cellular cytokine readouts not directly measured\", \"Single-lab interaction data\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identifying CKIP-1 as the first activator of a HECT E3 ligase (Smurf1) and showing increased bone mass in knockouts defined its central role in BMP/bone regulation.\",\n      \"evidence\": \"Co-IP, in vitro ubiquitylation, domain mapping, and KO mouse histomorphometry\",\n      \"pmids\": [\"18641638\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of WW-linker binding not resolved\", \"Whether Smurf1 activation extends to all Smurf1 substrates unclear\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defining a PH-domain nuclear-targeting motif opposed by a C-terminal auto-inhibitory region explained how CKIP-1 partitions between membrane and nuclear pools.\",\n      \"evidence\": \"Deletion/point-mutant localization imaging\",\n      \"pmids\": [\"20171213\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Signals that toggle auto-inhibition in vivo not identified\", \"No interacting nuclear import machinery defined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Showing CKIP-1 recruits PP2A to HDAC4 to suppress MEF2C and that knockouts develop hypertrophy established a protective cardiac signaling role.\",\n      \"evidence\": \"GST pull-down, co-IP, and KO plus transgenic mouse hypertrophy models\",\n      \"pmids\": [\"23151343\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How CKIP-1 selects HDAC4 over other substrates unclear\", \"Membrane-versus-nuclear pool responsible not dissected\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstrating PH-domain-mediated recruitment of Arp2/3 (via ARPC1) to the membrane connected CKIP-1's phosphoinositide binding to cortical actin and myoblast fusion in two model systems.\",\n      \"evidence\": \"siRNA and zebrafish morpholino knockdown, co-IP, live imaging, and PH-domain binding assays\",\n      \"pmids\": [\"22553210\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Coordination between CP and Arp2/3 binding not resolved\", \"Direct ARPC1 binding interface unmapped\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showing CKIP-1 suppresses Smurf1 levels via mTOR-dependent translation and autodegradation extended the CKIP-1\\u2013Smurf1 axis into tumor growth and migration control.\",\n      \"evidence\": \"Gain/loss of function in colon cancer lines, rapamycin treatment, and xenograft assays\",\n      \"pmids\": [\"23995790\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Reconciliation with Smurf1 activation reported elsewhere not addressed\", \"Single tumor type\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defining the TRAF6 interaction and GSK3\\u03b2/Ser-342-primed degradation of CKIP-1 established a feedback loop terminating M-CSF\\u2013driven Akt activation and restraining myeloproliferation.\",\n      \"evidence\": \"Co-IP, phospho-mutagenesis, ubiquitination assay, and KO mouse phenotyping\",\n      \"pmids\": [\"24777252\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ubiquitin ligase acting on phosphorylated CKIP-1 not identified\", \"Direct effect on TRAF6 catalytic activity unresolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showing nuclear CKIP-1 enhances HDAC1 repression of the C/EBP\\u03b1 promoter assigned it a transcriptional role suppressing adipogenesis.\",\n      \"evidence\": \"Co-IP, ChIP, KO mouse differentiation and high-fat-diet assays\",\n      \"pmids\": [\"25240053\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct CKIP-1 DNA contact versus HDAC1 bridging unclear\", \"Single-lab mechanism\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrating PH-domain competition with PKC\\u03b8 for CARMA1 placed CKIP-1 as an intrinsic brake on T-cell NF-\\u03baB signaling controlled by lipid-raft dynamics.\",\n      \"evidence\": \"Complementation screen, co-IP, raft fractionation, and NF-\\u03baB reporter\",\n      \"pmids\": [\"24465689\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo T-cell phenotype not established\", \"Stoichiometry of competition not quantified\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Showing EGF-induced co-translocation of CK2\\u03b1\\u2013CKIP-1\\u2013PAK1 to ruffles, with CKIP-1 bridging CK2-mediated PAK1 Ser-223 phosphorylation, linked the scaffold to migration/invasion.\",\n      \"evidence\": \"Co-IP, fractionation/imaging, PI3K inhibition, knockdown, and migration assays\",\n      \"pmids\": [\"26160174\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct versus indirect PAK1 phosphorylation effects on motility not separated\", \"Single-lab finding\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"In vivo osteoblast-specific epistasis showed age-rising PLEKHO1 suppresses BMP/Smad signaling, identifying it as a driver of age-related bone loss and a therapeutic siRNA target.\",\n      \"evidence\": \"Conditional KO/overexpression mice, histomorphometry, pSmad immunoblotting, and in vivo siRNA\",\n      \"pmids\": [\"28083909\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trigger for age-dependent PLEKHO1 upregulation unknown\", \"Translation to human bone disease untested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defining linkage-specific Nrf2/Keap1/Smurf1 ubiquitination changes placed CKIP-1 as an activator of Nrf2/ARE antioxidant defense protecting against renal fibrosis.\",\n      \"evidence\": \"K48/K63 ubiquitination assays, Nrf2 reporter, and KO mice\",\n      \"pmids\": [\"29248720\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct enzymatic basis for altered ubiquitin linkages unclear\", \"Single-lab mechanism\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identifying a CKIP-1\\u2013JNK1 interaction tied CKIP-1 loss to enhanced JNK1/IRS-1 phosphorylation and hepatic lipid accumulation.\",\n      \"evidence\": \"In vitro pull-down/co-IP and KO mouse high-fat-diet phenotyping\",\n      \"pmids\": [\"28351752\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether CKIP-1 directly inhibits JNK1 activity unresolved\", \"Single-lab observation\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"In vivo epistasis in chick embryos showed CKIP-1 restrains Smurf1-mediated Smad degradation to maintain BMP levels required for neural crest induction, extending the bone axis to development.\",\n      \"evidence\": \"Morpholino/siRNA knockdown, Smurf1 overexpression rescue, BMP reporter, and pSmad immunostaining\",\n      \"pmids\": [\"29949573\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Spatial control of CKIP-1 at the neural plate border not defined\", \"Whether other Smurf1 substrates contribute unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrating CKIP-1\\u2013REG\\u03b3-dependent degradation of Oct-1 to suppress LOX-1 established a hematopoietic-cell-autonomous anti-atherosclerotic function.\",\n      \"evidence\": \"Co-IP, degradation assay, LOX-1 promoter reporter, KO mouse atherosclerosis model, and bone marrow transplant\",\n      \"pmids\": [\"30683852\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether REG\\u03b3 recruitment is direct or scaffolded unclear\", \"Generality of Oct-1 targeting beyond macrophages untested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Placing CKIP-1 downstream of Cx43 in Nrf2 activation linked gap-junction signaling to CKIP-1\\u2013dependent antioxidant defense.\",\n      \"evidence\": \"Co-IP, immunofluorescence, knockdown, Cx43 overexpression in KO mice, and Nrf2 reporter\",\n      \"pmids\": [\"33276097\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How Cx43 CT regulates CKIP-1 expression mechanistically unclear\", \"Single-lab finding\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defining Src-driven, c-Cbl-mediated K48 ubiquitination at Lys252 explained CKIP-1 downregulation in diabetic kidney, adding a second degradation route beyond GSK3\\u03b2 priming.\",\n      \"evidence\": \"Co-IP, Lys252 mutagenesis, K48-specific ubiquitination assay, and KO mice\",\n      \"pmids\": [\"36347273\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relative contribution of Src/c-Cbl versus other ligases not quantified\", \"Single-lab mechanism\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Showing CKIP-1 drives CK2 nuclear-to-cytoplasmic translocation and SAP97 phosphorylation connected the scaffold to cardiac ion channel complex assembly.\",\n      \"evidence\": \"In vitro CK2 kinase assay, overexpression, fractionation, and patch-clamp of Nav1.5/Kir2.1 currents\",\n      \"pmids\": [\"39056188\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo cardiac electrophysiological relevance untested\", \"Single-lab, single-paper finding\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identifying VHL-mediated CKIP-1 degradation and a direct-binding ligand (C77) opened a route to pharmacological PROTAC-based CKIP-1 degradation.\",\n      \"evidence\": \"DNA-encoded library screen, SPR, CETSA, and ubiquitination assay\",\n      \"pmids\": [\"39201556\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional cellular consequence of C77 demonstrated\", \"PROTAC efficacy not yet shown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Showing ATF2-driven PLEKHO1 expression and a PLEKHO1\\u2013NUS1 interaction implicated the gene as a progression factor in clear cell renal carcinoma.\",\n      \"evidence\": \"Dual-luciferase reporter, co-IP, knockdown, and xenograft models\",\n      \"pmids\": [\"39777695\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which NUS1 binding promotes progression unresolved\", \"Single-lab finding\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CKIP-1 selects among its many context-specific partners (Smurf1, PP2A/HDAC4, CARMA1, TRAF6, REG\\u03b3, capping protein/Arp2/3) and how localization and competing degradation pathways are coordinated to specify a given output remains unresolved.\",\n      \"evidence\": \"No single study integrates the partner-selection logic across tissues\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of the scaffold engaging distinct partners\", \"Quantitative rules for nuclear/membrane partitioning per stimulus undefined\", \"Cross-talk between the multiple CKIP-1 degradation routes unmapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 2, 7, 9, 14, 15, 20]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [7, 9, 12, 14, 20]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [1, 10]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [2, 5, 10]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 1, 8, 10, 14, 15]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 3, 8, 13]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3, 23]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [2, 5, 10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 9, 12, 14, 15]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [7, 11, 17, 20, 22, 24]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [7, 16, 19]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [17, 21]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [12, 14, 20]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"CSNK2A1\", \"SMURF1\", \"HDAC4\", \"PAK1\", \"CAPZA1\", \"TRAF6\", \"PSME3\", \"ARPC1B\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}