{"gene":"CACYBP","run_date":"2026-04-28T17:28:52","timeline":{"discoveries":[{"year":2001,"finding":"CacyBP/SIP (called SIP in this study) acts as an adaptor in a novel β-catenin degradation pathway: it physically links the E3 ubiquitin ligase Siah-1 to Skp1 and the F-box protein Ebi, forming an SCF-type ubiquitin ligase complex that targets β-catenin for proteasomal degradation independently of the phosphorylation sites recognized by β-TrCP. This pathway is induced downstream of p53.","method":"Co-immunoprecipitation, protein interaction mapping, overexpression in cells, p53-induction assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, pathway epistasis, multiple orthogonal methods, foundational study replicated broadly","pmids":["11389839"],"is_preprint":false},{"year":2002,"finding":"CacyBP/SIP binds multiple S100 family proteins (S100A1, S100A6, S100A12, S100B, S100P) in a Ca2+-dependent manner via its C-terminal fragment (residues 155–229), but does not bind S100A4, calbindin D9k, parvalbumin, or calmodulin. Interaction with S100B from brain and S100A6 from tumor cells was confirmed by co-immunoprecipitation.","method":"Affinity chromatography, nitrocellulose overlay assay with 125I-CacyBP/SIP, co-immunoprecipitation, domain mapping with truncation mutants","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro binding assays with multiple orthogonal methods and domain-level mapping","pmids":["12042313"],"is_preprint":false},{"year":2002,"finding":"Structural analysis of Siah1 revealed that a large electronegative concave surface formed across the dimer interface mediates interaction with SIP/CacyBP through ionic contacts. Site-directed mutagenesis of these electronegative residues abolished Siah1–SIP binding both in vitro and in cells.","method":"Crystal structure-based surface analysis, site-directed mutagenesis, in vitro binding assay, cellular co-immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — structure-guided mutagenesis with in vitro and cellular validation","pmids":["12421809"],"is_preprint":false},{"year":2005,"finding":"Solution NMR defined the modular domain structure of SIP/CacyBP: an N-terminal helical hairpin domain, a CS domain, and an unstructured C-terminal SGS domain. Chemical shift perturbation mapping showed Siah-1 interacts with the flexible linker between the N and CS domains, while Skp1 engages the CS domain exclusively through weak interactions. The modular architecture facilitates bringing Siah-1 and Skp1 into proximity for polyubiquitination of β-catenin.","method":"Solution NMR spectroscopy, chemical shift perturbation assays, domain mapping","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 — NMR structure with functional interaction mapping at domain resolution","pmids":["15996101"],"is_preprint":false},{"year":2006,"finding":"In vivo deletion of SIP/CacyBP in mice demonstrated that SIP is required for p53-induced β-catenin degradation in response to DNA damage, for the pre-TCR checkpoint in thymocyte development, and for G1 cell cycle arrest. SIP−/− embryonic fibroblasts showed increased growth rate due to defective G1 arrest, confirming the physiological role of the Siah1/SIP/Skp1/Ebi ubiquitin ligase complex.","method":"Knockout mouse generation, thymocyte development analysis, cell cycle analysis, β-catenin degradation assay in primary cells","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 — clean KO with multiple specific phenotypic readouts and biochemical validation","pmids":["16413921"],"is_preprint":false},{"year":2009,"finding":"CacyBP/SIP directly binds ERK1/2 kinases, and this interaction inhibits phosphorylation of the Elk-1 transcription factor both in vitro and in the nuclear fraction of NB2a cells. S100A6 competes with ERK1/2 for binding to CacyBP/SIP. The E217K mutant of CacyBP/SIP fails to bind ERK1/2 while retaining S100A6 binding, implicating an electrostatic binding mechanism.","method":"Co-immunoprecipitation, in vitro kinase/phosphorylation assay, site-directed mutagenesis, molecular modeling","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal binding assay with mutagenesis and functional readout, single lab","pmids":["19166809"],"is_preprint":false},{"year":2010,"finding":"CacyBP/SIP directly interacts with actin and induces G-actin polymerization and formation of circular actin filament bundles; the N-terminal fragment (residues 1–179) is sufficient for this activity. CacyBP/SIP also simultaneously interacts with tubulin, suggesting it can bridge actin and tubulin cytoskeletons. Overexpression in NIH 3T3 cells altered cell adhesion and migration.","method":"Zero-length cross-linking, co-sedimentation assay, proximity ligation assay, stable cell line generation, cell adhesion/migration assays, electron microscopy","journal":"Biochimica et biophysica acta","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal biochemical and cellular methods with functional consequence","pmids":["20637809"],"is_preprint":false},{"year":2010,"finding":"CacyBP/SIP exhibits intrinsic phosphatase activity toward ERK1/2; the E217K mutant lacks this activity. Kinetic parameters for phosphatase activity (Km and Vmax) were established using p-nitrophenyl phosphate as substrate. The activity is inhibited by okadaic acid (IC50 = 45 nM), and sequence analysis revealed similarities to phosphatase-like proteins and MAP kinase phosphatases.","method":"In vitro phosphatase assay with recombinant proteins, site-directed mutagenesis (E217K), kinetic analysis, bioinformatic sequence comparison","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 1 — in vitro enzymatic characterization with mutagenesis, single lab","pmids":["21110948"],"is_preprint":false},{"year":2011,"finding":"The Siah1/SIP/CacyBP ubiquitin E3 ligase complex regulates glucose starvation-induced proteasomal degradation of cytoplasmic p27kip1. SIP−/− embryonic fibroblasts have elevated cytosolic p27 and increased cell motility compared to wild-type cells, linking SIP-dependent p27 degradation to cell migration control under metabolic stress.","method":"Knockout fibroblast analysis, proteasome inhibitor experiments, cell motility assays, western blotting","journal":"Cell cycle (Georgetown, Tex.)","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with mechanistic biochemical readout and functional phenotype","pmids":["21734459"],"is_preprint":false},{"year":2012,"finding":"CacyBP/SIP binds directly to tropomyosin and to the actin–tropomyosin complex, inducing conformational changes in tropomyosin (increased AEDANS fluorescence). Without tropomyosin, CacyBP/SIP destabilizes actin filaments; tropomyosin reverses this effect. CacyBP/SIP reduces actin-activated myosin S1 ATPase activity, and tropomyosin enhances this inhibitory effect, indicating CacyBP/SIP modulates thin filament organization and function.","method":"Fluorescence spectroscopy with AEDANS-labeled tropomyosin, electron microscopy, co-sedimentation, ATPase colorimetric assay, direct binding assays","journal":"Biochimica et biophysica acta","confidence":"High","confidence_rationale":"Tier 1–2 — multiple reconstituted biochemical assays with structural and functional validation","pmids":["23266554"],"is_preprint":false},{"year":2017,"finding":"CacyBP/SIP dephosphorylates MAP kinase p38 in vitro and in NB2a cells treated with hydrogen peroxide. The middle CS domain of CacyBP/SIP is responsible for p38 dephosphorylation. Dephosphorylation by CacyBP/SIP is more effective under oxidative stress conditions, implicating CacyBP/SIP in pro-survival and pro-apoptotic p38 regulation.","method":"In vitro phosphatase assay with recombinant proteins and cell lysates, domain truncation mapping, cellular overexpression with hydrogen peroxide treatment","journal":"Amino acids","confidence":"Medium","confidence_rationale":"Tier 1–2 — in vitro assay with domain mapping and cellular validation, single lab","pmids":["28283909"],"is_preprint":false},{"year":2017,"finding":"CacyBP/SIP promotes interaction between Siah1 and cytoplasmic p27kip1, enhancing ubiquitination and proteasomal degradation of cytoplasmic p27. In glioma cells, this mechanism suppresses migration and invasion. Siah1 knockdown blocks p27 degradation, establishing the pathway order: CacyBP/SIP → Siah1 → cytoplasmic p27 ubiquitination → degradation → reduced motility.","method":"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown, overexpression, cell migration/invasion assays (Transwell)","journal":"Cell biology international","confidence":"Medium","confidence_rationale":"Tier 2 — epistasis by siRNA, Co-IP, ubiquitination assay, single lab","pmids":["29024247"],"is_preprint":false},{"year":2019,"finding":"SIP/CacyBP promotes autophagy by two mechanisms: (1) under normal conditions it inhibits Nrdp1-mediated ubiquitination and degradation of BRUCE/Apollon, which otherwise promotes proteasomal degradation of LC3-I; (2) upon starvation, SIP together with Rab8 enhances translocation of BRUCE into recycling endosomes and its autophagic destruction via optineurin-mediated autophagy. SIP deletion reduces autophagic clearance of damaged mitochondria and cytosolic protein aggregates.","method":"Co-immunoprecipitation, ubiquitination assay, autophagy flux assay, organelle fractionation, SIP knockout cell lines, confocal imaging","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods, KO cell lines with specific functional readouts, clear mechanism","pmids":["31213539"],"is_preprint":false},{"year":2019,"finding":"RNF41 (RING finger protein 41) is a specific E3 ubiquitin ligase for CACYBP/SIP: RNF41 binds CACYBP via its C-terminal substrate binding domain and ubiquitinates CACYBP, promoting its degradation through both proteasome- and lysosome-dependent pathways. CACYBP overexpression promotes Ser10, Thr157, and Thr198 phosphorylation of p27kip1 and its cytoplasmic retention, driving cell cycle progression; RNF41 co-expression attenuates this effect.","method":"Co-immunoprecipitation, ubiquitination assay, western blotting, immunofluorescence, domain mapping","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP with domain mapping and ubiquitination assay, single lab","pmids":["31754404"],"is_preprint":false},{"year":2020,"finding":"CacyBP/SIP acts as an HSP90 co-chaperone and directly interacts with α-synuclein to protect it from aggregation in vitro. The fragment overlapping the N-terminal part and CS domain is critical for this chaperone activity. In HEK293 cells overexpressing CacyBP/SIP, fewer α-synuclein inclusions form and cells are more viable upon rotenone treatment.","method":"Thioflavin T fluorescence assay, ultracentrifugation/dot-blot, transmission electron microscopy, proximity ligation assay, in vitro binding with purified recombinant proteins, cellular overexpression","journal":"Cells","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro reconstitution with multiple assays and cellular validation, domain mapping","pmids":["33049998"],"is_preprint":false},{"year":2022,"finding":"Splicing factor SFRS8 mediates alternative splicing of CACYBP pre-mRNA, reducing isoform 1 (NM_014412.3) and increasing isoform 2 (NM_001007214.1). Isoform switching alters the capacity of CACYBP to promote ubiquitination and degradation of β-catenin, linking the splicing event to Wnt/β-catenin pathway regulation and myeloma progression.","method":"RNA immunoprecipitation sequencing (RIP-seq), RIP-qPCR, Co-IP, RT-PCR isoform analysis, exosomal siRNA delivery, xenograft models","journal":"Clinical and translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 — RIP-seq with validation by Co-IP and functional rescue, single lab","pmids":["35184390"],"is_preprint":false},{"year":2023,"finding":"CacyBP/SIP binds to MyD88 (a master regulator of innate immunity) and protects it from Siah-1-mediated proteasomal degradation by competitively binding to the MyD88 TIR domain. This CacyBP–MyD88 signaling axis drives HDAC1-mediated histone acetylation (H3K9ac and H3K27ac) at the CX3CL1 promoter, promoting CX3CL1 transcription and secretion, which in turn recruits tumor-associated macrophages.","method":"Co-immunoprecipitation, immunofluorescence co-localization, ubiquitination assay, chromatin immunoprecipitation (H3K9ac/H3K27ac), in vitro and in vivo macrophage recruitment assays","journal":"Journal of experimental & clinical cancer research : CR","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP with ubiquitination and ChIP assays, single lab","pmids":["37968706"],"is_preprint":false},{"year":2016,"finding":"ERK1/2 dephosphorylation by CacyBP/SIP in neuroblastoma NB2a cells reduces pCREB and BDNF mRNA levels in undifferentiated cells, whereas the effect is opposite in differentiated cells. The differential response is attributed to changes in CacyBP/SIP posttranslational modifications and protein ligands upon differentiation.","method":"CacyBP/SIP overexpression and siRNA silencing, western blotting for pERK1/2 and pCREB, RT-PCR for BDNF mRNA, 2D electrophoresis for PTM analysis","journal":"Neurochemistry international","confidence":"Medium","confidence_rationale":"Tier 2 — cellular gain/loss-of-function with downstream pathway readouts, single lab","pmids":["27180052"],"is_preprint":false},{"year":2014,"finding":"Gastrin stimulation induces nuclear translocation of CacyBP/SIP in gastric cancer cells, which promotes cell proliferation and cell cycle progression (G1/S transition). In colon cancer cells, gastrin-triggered nuclear translocation of CacyBP/SIP enhances interaction with SKP1, promoting proteasome-dependent degradation of p27kip1; this effect is blocked by the proteasome inhibitor MG132.","method":"Immunofluorescence, cellular fractionation/western blot, MTT/colony formation assays, flow cytometry, co-immunoprecipitation, MG132 inhibition","journal":"World journal of gastroenterology / PloS one","confidence":"Medium","confidence_rationale":"Tier 2–3 — subcellular localization linked to functional outcome with mechanistic pathway placement, single lab","pmids":["25110433","28196083"],"is_preprint":false}],"current_model":"CacyBP/SIP is a multi-domain adaptor/scaffold protein that: (1) bridges Siah-1 to Skp1/Ebi in an SCF-type ubiquitin ligase complex driving phosphorylation-independent β-catenin degradation downstream of p53; (2) acts as a phosphatase for ERK1/2 and p38 MAP kinases, thereby modulating Elk-1/CREB/BDNF transcriptional programs; (3) directly binds and regulates actin polymerization and the actin–tropomyosin thin filament while simultaneously engaging tubulin; (4) promotes autophagy by suppressing BRUCE-dependent proteasomal degradation of LC3-I and facilitating BRUCE's autophagic destruction via Rab8; (5) is itself ubiquitinated and degraded by RNF41; (6) acts as an HSP90 co-chaperone that prevents α-synuclein aggregation; and (7) protects MyD88 from Siah-1-mediated degradation to regulate innate immune signaling and tumor microenvironment remodeling."},"narrative":{"teleology":[{"year":2001,"claim":"Identifying CACYBP/SIP as the adaptor that bridges Siah-1 to Skp1/Ebi established an entirely new, phosphorylation-independent pathway for β-catenin degradation downstream of p53, answering how p53 can suppress Wnt signaling outside the canonical β-TrCP route.","evidence":"Co-immunoprecipitation, protein interaction mapping, and p53-induction assays in human cell lines","pmids":["11389839"],"confidence":"High","gaps":["Catalytic mechanism of the assembled Siah-1/SIP/Skp1/Ebi complex not reconstituted with purified components","Relative contribution of this pathway versus β-TrCP in vivo unknown","Post-translational regulation of SIP within the complex not addressed"]},{"year":2002,"claim":"Defining the Ca²⁺-dependent interaction of CACYBP with multiple S100 proteins (S100A6, S100B, S100A1, S100A12, S100P) via its C-terminal SGS domain revealed a potential regulatory input through calcium signaling, while structural analysis of the Siah1 dimer showed the electrostatic basis of SIP recruitment.","evidence":"Affinity chromatography, ¹²⁵I-overlay, co-IP for S100 binding; crystal structure-guided mutagenesis for Siah1 interaction","pmids":["12042313","12421809"],"confidence":"High","gaps":["Functional consequence of S100 binding on SIP's ubiquitin ligase adaptor activity not tested","Whether S100 proteins and Siah-1 bind SIP simultaneously or compete was unresolved"]},{"year":2005,"claim":"NMR-based domain mapping resolved how SIP's modular architecture (N-terminal helical hairpin, CS domain, SGS domain) simultaneously engages Siah-1 (via the inter-domain linker) and Skp1 (via the CS domain), explaining the scaffolding mechanism at atomic resolution.","evidence":"Solution NMR spectroscopy with chemical shift perturbation mapping of individual domains","pmids":["15996101"],"confidence":"High","gaps":["No high-resolution structure of the full ternary SIP–Siah1–Skp1 complex","Skp1 interaction was weak, raising questions about complex stability in vivo"]},{"year":2006,"claim":"Genetic deletion of SIP in mice demonstrated its physiological requirement for p53-induced β-catenin degradation, thymocyte pre-TCR checkpoint, and G1 cell-cycle arrest, converting earlier biochemical observations into validated in vivo functions.","evidence":"SIP knockout mouse with thymocyte analysis, cell-cycle profiling, and β-catenin turnover assays in primary fibroblasts","pmids":["16413921"],"confidence":"High","gaps":["Relative contribution of β-catenin versus p27 degradation to the KO phenotypes not separated","Tissue-specific conditional knockout studies not performed"]},{"year":2009,"claim":"Discovery that CACYBP/SIP directly binds and inhibits ERK1/2 phosphorylation of Elk-1, with S100A6 competing for SIP binding, linked the calcium-sensing and MAP kinase signaling functions, answering how S100 proteins might regulate ERK output through SIP.","evidence":"Co-immunoprecipitation, in vitro kinase assay, E217K mutagenesis in NB2a neuroblastoma cells","pmids":["19166809"],"confidence":"Medium","gaps":["Whether the ERK-inhibitory effect is direct binding or catalytic dephosphorylation was unclear at this stage","In vivo relevance of S100A6–ERK competition not demonstrated"]},{"year":2010,"claim":"Two advances redefined CACYBP/SIP's functional breadth: it was shown to polymerize G-actin and simultaneously bind tubulin, bridging the two major cytoskeletal systems, and separately it was found to possess intrinsic phosphatase activity toward ERK1/2, with the E217K mutation abolishing catalysis.","evidence":"Co-sedimentation, cross-linking, electron microscopy, and cell migration assays for cytoskeletal work; p-nitrophenyl phosphate kinetic analysis and okadaic acid inhibition for phosphatase activity","pmids":["20637809","21110948"],"confidence":"High","gaps":["Crystal structure of a SIP–actin or SIP–tubulin complex not determined","Phosphatase catalytic mechanism not defined at the structural level","Physiological substrate specificity of the phosphatase activity beyond ERK not mapped"]},{"year":2011,"claim":"Extending the ubiquitin ligase adaptor role to cytoplasmic p27kip1 under glucose starvation, and linking p27 turnover to cell motility in SIP−/− fibroblasts, answered how metabolic stress co-opts the Siah1/SIP complex to regulate migration independently of β-catenin.","evidence":"SIP knockout fibroblasts, proteasome inhibitor treatment, cell motility assays","pmids":["21734459"],"confidence":"High","gaps":["Direct ubiquitination of p27 by the reconstituted complex not shown in vitro","Whether SIP mediates p27 degradation in tissues beyond fibroblasts unknown"]},{"year":2012,"claim":"Demonstrating that CACYBP/SIP binds tropomyosin and the actin–tropomyosin complex, altering tropomyosin conformation and modulating myosin ATPase activity, established SIP as a bona fide thin-filament regulatory protein beyond a simple actin-binding factor.","evidence":"AEDANS-fluorescence spectroscopy, co-sedimentation, electron microscopy, ATPase assays with purified proteins","pmids":["23266554"],"confidence":"High","gaps":["In vivo relevance in muscle or non-muscle cells not shown","Binding stoichiometry along the thin filament not determined"]},{"year":2014,"claim":"Gastrin-induced nuclear translocation of CACYBP/SIP and its consequent enhancement of Skp1 interaction for p27 degradation revealed signal-dependent subcellular redistribution as a regulatory mechanism controlling cell proliferation.","evidence":"Immunofluorescence, cellular fractionation, co-IP, proteasome inhibition in gastric and colon cancer cells","pmids":["25110433","28196083"],"confidence":"Medium","gaps":["Mechanism of nuclear translocation (NLS, carrier protein) not identified","Single-lab observation without independent replication"]},{"year":2016,"claim":"Showing that CACYBP/SIP-dependent ERK1/2 dephosphorylation differentially regulates pCREB and BDNF expression in undifferentiated versus differentiated neuroblastoma cells answered how the same phosphatase activity produces context-dependent transcriptional outcomes.","evidence":"Overexpression/siRNA, western blot for pERK/pCREB, RT-PCR for BDNF, 2D electrophoresis for PTM changes in NB2a cells","pmids":["27180052"],"confidence":"Medium","gaps":["Identity of differentiation-dependent PTMs or binding partners not characterized","Not validated in primary neurons"]},{"year":2017,"claim":"Extending phosphatase activity to p38 MAP kinase, with the CS domain as the catalytic region, and confirming the Siah1-dependent p27 ubiquitination mechanism in glioma cells broadened CACYBP/SIP's roles in stress signaling and tumor biology.","evidence":"In vitro phosphatase assays with domain truncations and H₂O₂ stress (p38); Co-IP, ubiquitination assay, siRNA epistasis, Transwell migration assays (p27/glioma)","pmids":["28283909","29024247"],"confidence":"Medium","gaps":["Structural basis of CS domain phosphatase activity unknown","p38 dephosphorylation not validated in knockout cells"]},{"year":2019,"claim":"Two studies revealed new layers of CACYBP/SIP regulation and function: it promotes autophagy by stabilizing BRUCE against Nrdp1-mediated degradation and facilitating starvation-induced BRUCE autophagic turnover via Rab8, while RNF41 was identified as the E3 ligase that ubiquitinates and degrades CACYBP itself, controlling its abundance and downstream effects on p27.","evidence":"CACYBP KO cell lines, autophagy flux assays, organelle fractionation, confocal imaging (autophagy); Co-IP, ubiquitination assay, domain mapping (RNF41)","pmids":["31213539","31754404"],"confidence":"High","gaps":["Physiological stimuli regulating RNF41–CACYBP axis unknown","Whether autophagy promotion and ubiquitin ligase adaptor functions are coordinated or independent is unclear"]},{"year":2020,"claim":"Identification of CACYBP/SIP as an HSP90 co-chaperone that directly prevents α-synuclein aggregation revealed a neuroprotective function, answering how it suppresses protein misfolding in neurodegenerative contexts.","evidence":"Thioflavin T fluorescence, ultracentrifugation, TEM, proximity ligation assay, cellular overexpression with rotenone treatment in HEK293 cells","pmids":["33049998"],"confidence":"High","gaps":["In vivo relevance in animal models of synucleinopathy not tested","Whether chaperone function requires HSP90 or can act independently not fully dissected"]},{"year":2022,"claim":"Demonstrating that SFRS8-mediated alternative splicing switches CACYBP isoforms and alters β-catenin ubiquitination capacity linked RNA processing to the output of the Siah-1/SIP pathway, answering how CACYBP activity is regulated at the pre-mRNA level.","evidence":"RIP-seq, RIP-qPCR, Co-IP, RT-PCR isoform analysis, exosomal siRNA delivery, xenograft models in myeloma","pmids":["35184390"],"confidence":"Medium","gaps":["Structural differences between isoforms and their biochemical consequences not characterized","Generalizability beyond myeloma not established"]},{"year":2023,"claim":"Revealing that CACYBP/SIP protects MyD88 from Siah-1-mediated degradation and thereby drives HDAC1-dependent CX3CL1 transcription and macrophage recruitment established a new role for the SIP–Siah1 axis in innate immunity and tumor microenvironment remodeling.","evidence":"Co-IP, ubiquitination assay, ChIP for H3K9ac/H3K27ac, macrophage recruitment assays in vitro and in vivo","pmids":["37968706"],"confidence":"Medium","gaps":["Whether SIP competes with Siah-1 for MyD88 binding or allosterically blocks ubiquitination not mechanistically resolved","Not validated in SIP-knockout immune cells"]},{"year":null,"claim":"Major unresolved questions include: (1) the structural basis of CACYBP/SIP's phosphatase activity and whether it represents a novel phosphatase fold; (2) how its multiple functions (ubiquitin ligase adaptor, phosphatase, cytoskeletal regulator, co-chaperone, autophagy promoter) are coordinated or compartmentalized within cells; and (3) the physiological hierarchy among its substrates (β-catenin, p27, ERK1/2, p38, BRUCE, MyD88, α-synuclein) in different tissue contexts.","evidence":"","pmids":[],"confidence":"Low","gaps":["No full-length high-resolution structure of CACYBP/SIP","Conditional tissue-specific knockout studies not reported","Systematic interactome under varying cellular conditions not performed"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,3,4,8,11,16]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[7,10]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[6,9]},{"term_id":"GO:0044183","term_label":"protein folding chaperone","supporting_discovery_ids":[14]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[5,7,10,12,17]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,6,8]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[18]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[6,9]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,4,5,15,17]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[4,8,13,18]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,8,11,12,13]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[12]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[16]}],"complexes":["Siah-1/SIP/Skp1/Ebi E3 ubiquitin ligase complex"],"partners":["SIAH1","SKP1","BIRC6","S100A6","RNF41","MYD88","ACTB","SNCA"],"other_free_text":[]},"mechanistic_narrative":"CACYBP (also known as SIP) is a multi-domain scaffold protein that participates in ubiquitin-dependent proteolysis, cytoskeletal regulation, MAP kinase dephosphorylation, and autophagy. Its best-characterized function is as an adaptor in a Siah-1/Skp1/Ebi SCF-type E3 ubiquitin ligase complex that targets β-catenin and cytoplasmic p27kip1 for proteasomal degradation downstream of p53 and metabolic stress, and knockout mice confirm its requirement for p53-induced β-catenin turnover, thymocyte development, and G1 cell-cycle arrest [PMID:11389839, PMID:16413921, PMID:21734459]. CACYBP directly binds actin and tropomyosin to modulate thin-filament organization and myosin ATPase activity, simultaneously engages tubulin, possesses intrinsic phosphatase activity toward ERK1/2 and p38 that tunes Elk-1/CREB/BDNF transcriptional programs, and acts as an HSP90 co-chaperone that suppresses α-synuclein aggregation [PMID:20637809, PMID:23266554, PMID:21110948, PMID:28283909, PMID:33049998]. Under basal conditions it sustains autophagy by stabilizing BRUCE/Apollon against Nrdp1-mediated degradation, while upon starvation it promotes Rab8-dependent autophagic destruction of BRUCE; it also protects MyD88 from Siah-1-mediated degradation, linking it to innate immune signaling and CX3CL1-driven macrophage recruitment [PMID:31213539, PMID:37968706]."},"prefetch_data":{"uniprot":{"accession":"Q9HB71","full_name":"Calcyclin-binding protein","aliases":["S100A6-binding protein","Siah-interacting protein"],"length_aa":228,"mass_kda":26.2,"function":"May be involved in calcium-dependent ubiquitination and subsequent proteasomal degradation of target proteins. Probably serves as a molecular bridge in ubiquitin E3 complexes. Participates in the ubiquitin-mediated degradation of beta-catenin (CTNNB1)","subcellular_location":"Nucleus; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q9HB71/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CACYBP","classification":"Not Classified","n_dependent_lines":136,"n_total_lines":1208,"dependency_fraction":0.11258278145695365},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"PTGES3","stoichiometry":4.0},{"gene":"CAPZB","stoichiometry":0.2},{"gene":"FKBP5","stoichiometry":0.2},{"gene":"FKBP8","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/CACYBP","total_profiled":1310},"omim":[{"mim_id":"619294","title":"NIBAN APOPTOSIS REGULATOR 1; NIBAN1","url":"https://www.omim.org/entry/619294"},{"mim_id":"606186","title":"CALCYCLIN-BINDING PROTEIN; CACYBP","url":"https://www.omim.org/entry/606186"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Cytosol","reliability":"Enhanced"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CACYBP"},"hgnc":{"alias_symbol":["SIP","S100A6BP"],"prev_symbol":[]},"alphafold":{"accession":"Q9HB71","domains":[{"cath_id":"4.10.860.10","chopping":"1-47","consensus_level":"medium","plddt":87.8964,"start":1,"end":47},{"cath_id":"2.60.40.790","chopping":"71-170","consensus_level":"high","plddt":95.4484,"start":71,"end":170}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9HB71","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9HB71-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9HB71-F1-predicted_aligned_error_v6.png","plddt_mean":81.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CACYBP","jax_strain_url":"https://www.jax.org/strain/search?query=CACYBP"},"sequence":{"accession":"Q9HB71","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9HB71.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9HB71/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9HB71"}},"corpus_meta":[{"pmid":"11389839","id":"PMC_11389839","title":"Siah-1, SIP, and Ebi collaborate in a novel pathway for beta-catenin degradation linked to p53 responses.","date":"2001","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/11389839","citation_count":521,"is_preprint":false},{"pmid":"23788333","id":"PMC_23788333","title":"Hydrocarbon-degrading bacteria enriched by the Deepwater Horizon oil spill identified by cultivation and DNA-SIP.","date":"2013","source":"The ISME journal","url":"https://pubmed.ncbi.nlm.nih.gov/23788333","citation_count":174,"is_preprint":false},{"pmid":"12042313","id":"PMC_12042313","title":"CacyBP/SIP, a calcyclin and Siah-1-interacting protein, binds EF-hand proteins of the S100 family.","date":"2002","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12042313","citation_count":126,"is_preprint":false},{"pmid":"10992461","id":"PMC_10992461","title":"Identification of group B streptococcal Sip protein, which elicits cross-protective immunity.","date":"2000","source":"Infection and immunity","url":"https://pubmed.ncbi.nlm.nih.gov/10992461","citation_count":117,"is_preprint":false},{"pmid":"9325333","id":"PMC_9325333","title":"Bacillus subtilis contains four closely related type I signal peptidases with overlapping substrate specificities. 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and RNA-SIP Reveal Nitrospira spp. as Key Drivers of Nitrification in Groundwater-Fed Biofilters.","date":"2019","source":"mBio","url":"https://pubmed.ncbi.nlm.nih.gov/31690672","citation_count":19,"is_preprint":false},{"pmid":"35803194","id":"PMC_35803194","title":"New insight into the mechanism underlying the effect of biochar on phenanthrene degradation in contaminated soil revealed through DNA-SIP.","date":"2022","source":"Journal of hazardous materials","url":"https://pubmed.ncbi.nlm.nih.gov/35803194","citation_count":18,"is_preprint":false},{"pmid":"28068373","id":"PMC_28068373","title":"Stress-Dependent Changes in the CacyBP/SIP Interacting Protein S100A6 in the Mouse Brain.","date":"2017","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/28068373","citation_count":18,"is_preprint":false},{"pmid":"22371500","id":"PMC_22371500","title":"Steroid receptor coactivator-interacting protein (SIP) inhibits caspase-independent apoptosis by preventing apoptosis-inducing factor (AIF) from being released from mitochondria.","date":"2012","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/22371500","citation_count":18,"is_preprint":false},{"pmid":"28476676","id":"PMC_28476676","title":"Protective efficacy of cationic-PLGA microspheres loaded with DNA vaccine encoding the sip gene of Streptococcus agalactiae in tilapia.","date":"2017","source":"Fish & shellfish immunology","url":"https://pubmed.ncbi.nlm.nih.gov/28476676","citation_count":18,"is_preprint":false},{"pmid":"16844270","id":"PMC_16844270","title":"Naturally occurring antibodies for the group B streptococcal surface immunogenic protein (Sip) in pregnant women and newborn babies.","date":"2006","source":"Vaccine","url":"https://pubmed.ncbi.nlm.nih.gov/16844270","citation_count":18,"is_preprint":false},{"pmid":"29024247","id":"PMC_29024247","title":"CacyBP/SIP inhibits the migration and invasion behaviors of glioblastoma cells through activating Siah1 mediated ubiquitination and degradation of cytoplasmic p27.","date":"2017","source":"Cell biology international","url":"https://pubmed.ncbi.nlm.nih.gov/29024247","citation_count":18,"is_preprint":false},{"pmid":"26846217","id":"PMC_26846217","title":"Pulsed (13)C2-Acetate Protein-SIP Unveils Epsilonproteobacteria as Dominant Acetate Utilizers in a Sulfate-Reducing Microbial Community Mineralizing Benzene.","date":"2016","source":"Microbial ecology","url":"https://pubmed.ncbi.nlm.nih.gov/26846217","citation_count":18,"is_preprint":false},{"pmid":"34392205","id":"PMC_34392205","title":"Identification of pyrene degraders via DNA-SIP in oilfield soil during natural attenuation, bioaugmentation and biostimulation.","date":"2021","source":"The Science of the total environment","url":"https://pubmed.ncbi.nlm.nih.gov/34392205","citation_count":17,"is_preprint":false},{"pmid":"23463283","id":"PMC_23463283","title":"CacyBP/SIP enhances multidrug resistance of pancreatic cancer cells by regulation of P-gp and Bcl-2.","date":"2013","source":"Apoptosis : an international journal on programmed cell death","url":"https://pubmed.ncbi.nlm.nih.gov/23463283","citation_count":16,"is_preprint":false},{"pmid":"33330038","id":"PMC_33330038","title":"Comparative Assessment of the WNT/β-Catenin Pathway, CacyBP/SIP, and the Immunoproteasome Subunit LMP7 in Various Histological Types of Renal Cell Carcinoma.","date":"2020","source":"Frontiers in oncology","url":"https://pubmed.ncbi.nlm.nih.gov/33330038","citation_count":16,"is_preprint":false},{"pmid":"25110433","id":"PMC_25110433","title":"CacyBP/SIP nuclear translocation induced by gastrin promotes gastric cancer cell proliferation.","date":"2014","source":"World journal of gastroenterology","url":"https://pubmed.ncbi.nlm.nih.gov/25110433","citation_count":15,"is_preprint":false},{"pmid":"30656909","id":"PMC_30656909","title":"Current view on cellular function of S100A6 and its ligands, CacyBP/SIP and Sgt1.","date":"2018","source":"Postepy biochemii","url":"https://pubmed.ncbi.nlm.nih.gov/30656909","citation_count":15,"is_preprint":false},{"pmid":"30482253","id":"PMC_30482253","title":"Sex differences in distribution of cannabinoid receptors (CB1 and CB2), S100A6 and CacyBP/SIP in human ageing hearts.","date":"2018","source":"Biology of sex differences","url":"https://pubmed.ncbi.nlm.nih.gov/30482253","citation_count":15,"is_preprint":false},{"pmid":"37968706","id":"PMC_37968706","title":"Blockage of CacyBP inhibits macrophage recruitment and improves anti-PD-1 therapy in hepatocellular carcinoma.","date":"2023","source":"Journal of experimental & clinical cancer research : CR","url":"https://pubmed.ncbi.nlm.nih.gov/37968706","citation_count":14,"is_preprint":false},{"pmid":"28283909","id":"PMC_28283909","title":"MAP kinase p38 is a novel target of CacyBP/SIP phosphatase.","date":"2017","source":"Amino 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CacyBP/SIP on the ERK1/2-CREB-BDNF pathway in undifferentiated and differentiated neuroblastoma NB2a cells.","date":"2016","source":"Neurochemistry international","url":"https://pubmed.ncbi.nlm.nih.gov/27180052","citation_count":13,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":49369,"output_tokens":5118,"usd":0.112438},"stage2":{"model":"claude-opus-4-6","input_tokens":8695,"output_tokens":4315,"usd":0.227025},"total_usd":0.339463,"stage1_batch_id":"msgbatch_011kfMfE81o6CTcyhVUqumuW","stage2_batch_id":"msgbatch_01DTputS6WNkH745x1nVSoBo","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2001,\n      \"finding\": \"CacyBP/SIP (called SIP in this study) acts as an adaptor in a novel β-catenin degradation pathway: it physically links the E3 ubiquitin ligase Siah-1 to Skp1 and the F-box protein Ebi, forming an SCF-type ubiquitin ligase complex that targets β-catenin for proteasomal degradation independently of the phosphorylation sites recognized by β-TrCP. This pathway is induced downstream of p53.\",\n      \"method\": \"Co-immunoprecipitation, protein interaction mapping, overexpression in cells, p53-induction assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, pathway epistasis, multiple orthogonal methods, foundational study replicated broadly\",\n      \"pmids\": [\"11389839\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"CacyBP/SIP binds multiple S100 family proteins (S100A1, S100A6, S100A12, S100B, S100P) in a Ca2+-dependent manner via its C-terminal fragment (residues 155–229), but does not bind S100A4, calbindin D9k, parvalbumin, or calmodulin. Interaction with S100B from brain and S100A6 from tumor cells was confirmed by co-immunoprecipitation.\",\n      \"method\": \"Affinity chromatography, nitrocellulose overlay assay with 125I-CacyBP/SIP, co-immunoprecipitation, domain mapping with truncation mutants\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro binding assays with multiple orthogonal methods and domain-level mapping\",\n      \"pmids\": [\"12042313\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Structural analysis of Siah1 revealed that a large electronegative concave surface formed across the dimer interface mediates interaction with SIP/CacyBP through ionic contacts. Site-directed mutagenesis of these electronegative residues abolished Siah1–SIP binding both in vitro and in cells.\",\n      \"method\": \"Crystal structure-based surface analysis, site-directed mutagenesis, in vitro binding assay, cellular co-immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — structure-guided mutagenesis with in vitro and cellular validation\",\n      \"pmids\": [\"12421809\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Solution NMR defined the modular domain structure of SIP/CacyBP: an N-terminal helical hairpin domain, a CS domain, and an unstructured C-terminal SGS domain. Chemical shift perturbation mapping showed Siah-1 interacts with the flexible linker between the N and CS domains, while Skp1 engages the CS domain exclusively through weak interactions. The modular architecture facilitates bringing Siah-1 and Skp1 into proximity for polyubiquitination of β-catenin.\",\n      \"method\": \"Solution NMR spectroscopy, chemical shift perturbation assays, domain mapping\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — NMR structure with functional interaction mapping at domain resolution\",\n      \"pmids\": [\"15996101\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"In vivo deletion of SIP/CacyBP in mice demonstrated that SIP is required for p53-induced β-catenin degradation in response to DNA damage, for the pre-TCR checkpoint in thymocyte development, and for G1 cell cycle arrest. SIP−/− embryonic fibroblasts showed increased growth rate due to defective G1 arrest, confirming the physiological role of the Siah1/SIP/Skp1/Ebi ubiquitin ligase complex.\",\n      \"method\": \"Knockout mouse generation, thymocyte development analysis, cell cycle analysis, β-catenin degradation assay in primary cells\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with multiple specific phenotypic readouts and biochemical validation\",\n      \"pmids\": [\"16413921\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CacyBP/SIP directly binds ERK1/2 kinases, and this interaction inhibits phosphorylation of the Elk-1 transcription factor both in vitro and in the nuclear fraction of NB2a cells. S100A6 competes with ERK1/2 for binding to CacyBP/SIP. The E217K mutant of CacyBP/SIP fails to bind ERK1/2 while retaining S100A6 binding, implicating an electrostatic binding mechanism.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase/phosphorylation assay, site-directed mutagenesis, molecular modeling\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal binding assay with mutagenesis and functional readout, single lab\",\n      \"pmids\": [\"19166809\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CacyBP/SIP directly interacts with actin and induces G-actin polymerization and formation of circular actin filament bundles; the N-terminal fragment (residues 1–179) is sufficient for this activity. CacyBP/SIP also simultaneously interacts with tubulin, suggesting it can bridge actin and tubulin cytoskeletons. Overexpression in NIH 3T3 cells altered cell adhesion and migration.\",\n      \"method\": \"Zero-length cross-linking, co-sedimentation assay, proximity ligation assay, stable cell line generation, cell adhesion/migration assays, electron microscopy\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal biochemical and cellular methods with functional consequence\",\n      \"pmids\": [\"20637809\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CacyBP/SIP exhibits intrinsic phosphatase activity toward ERK1/2; the E217K mutant lacks this activity. Kinetic parameters for phosphatase activity (Km and Vmax) were established using p-nitrophenyl phosphate as substrate. The activity is inhibited by okadaic acid (IC50 = 45 nM), and sequence analysis revealed similarities to phosphatase-like proteins and MAP kinase phosphatases.\",\n      \"method\": \"In vitro phosphatase assay with recombinant proteins, site-directed mutagenesis (E217K), kinetic analysis, bioinformatic sequence comparison\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — in vitro enzymatic characterization with mutagenesis, single lab\",\n      \"pmids\": [\"21110948\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The Siah1/SIP/CacyBP ubiquitin E3 ligase complex regulates glucose starvation-induced proteasomal degradation of cytoplasmic p27kip1. SIP−/− embryonic fibroblasts have elevated cytosolic p27 and increased cell motility compared to wild-type cells, linking SIP-dependent p27 degradation to cell migration control under metabolic stress.\",\n      \"method\": \"Knockout fibroblast analysis, proteasome inhibitor experiments, cell motility assays, western blotting\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with mechanistic biochemical readout and functional phenotype\",\n      \"pmids\": [\"21734459\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CacyBP/SIP binds directly to tropomyosin and to the actin–tropomyosin complex, inducing conformational changes in tropomyosin (increased AEDANS fluorescence). Without tropomyosin, CacyBP/SIP destabilizes actin filaments; tropomyosin reverses this effect. CacyBP/SIP reduces actin-activated myosin S1 ATPase activity, and tropomyosin enhances this inhibitory effect, indicating CacyBP/SIP modulates thin filament organization and function.\",\n      \"method\": \"Fluorescence spectroscopy with AEDANS-labeled tropomyosin, electron microscopy, co-sedimentation, ATPase colorimetric assay, direct binding assays\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple reconstituted biochemical assays with structural and functional validation\",\n      \"pmids\": [\"23266554\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CacyBP/SIP dephosphorylates MAP kinase p38 in vitro and in NB2a cells treated with hydrogen peroxide. The middle CS domain of CacyBP/SIP is responsible for p38 dephosphorylation. Dephosphorylation by CacyBP/SIP is more effective under oxidative stress conditions, implicating CacyBP/SIP in pro-survival and pro-apoptotic p38 regulation.\",\n      \"method\": \"In vitro phosphatase assay with recombinant proteins and cell lysates, domain truncation mapping, cellular overexpression with hydrogen peroxide treatment\",\n      \"journal\": \"Amino acids\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro assay with domain mapping and cellular validation, single lab\",\n      \"pmids\": [\"28283909\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CacyBP/SIP promotes interaction between Siah1 and cytoplasmic p27kip1, enhancing ubiquitination and proteasomal degradation of cytoplasmic p27. In glioma cells, this mechanism suppresses migration and invasion. Siah1 knockdown blocks p27 degradation, establishing the pathway order: CacyBP/SIP → Siah1 → cytoplasmic p27 ubiquitination → degradation → reduced motility.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown, overexpression, cell migration/invasion assays (Transwell)\",\n      \"journal\": \"Cell biology international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — epistasis by siRNA, Co-IP, ubiquitination assay, single lab\",\n      \"pmids\": [\"29024247\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SIP/CacyBP promotes autophagy by two mechanisms: (1) under normal conditions it inhibits Nrdp1-mediated ubiquitination and degradation of BRUCE/Apollon, which otherwise promotes proteasomal degradation of LC3-I; (2) upon starvation, SIP together with Rab8 enhances translocation of BRUCE into recycling endosomes and its autophagic destruction via optineurin-mediated autophagy. SIP deletion reduces autophagic clearance of damaged mitochondria and cytosolic protein aggregates.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, autophagy flux assay, organelle fractionation, SIP knockout cell lines, confocal imaging\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods, KO cell lines with specific functional readouts, clear mechanism\",\n      \"pmids\": [\"31213539\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RNF41 (RING finger protein 41) is a specific E3 ubiquitin ligase for CACYBP/SIP: RNF41 binds CACYBP via its C-terminal substrate binding domain and ubiquitinates CACYBP, promoting its degradation through both proteasome- and lysosome-dependent pathways. CACYBP overexpression promotes Ser10, Thr157, and Thr198 phosphorylation of p27kip1 and its cytoplasmic retention, driving cell cycle progression; RNF41 co-expression attenuates this effect.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, western blotting, immunofluorescence, domain mapping\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP with domain mapping and ubiquitination assay, single lab\",\n      \"pmids\": [\"31754404\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CacyBP/SIP acts as an HSP90 co-chaperone and directly interacts with α-synuclein to protect it from aggregation in vitro. The fragment overlapping the N-terminal part and CS domain is critical for this chaperone activity. In HEK293 cells overexpressing CacyBP/SIP, fewer α-synuclein inclusions form and cells are more viable upon rotenone treatment.\",\n      \"method\": \"Thioflavin T fluorescence assay, ultracentrifugation/dot-blot, transmission electron microscopy, proximity ligation assay, in vitro binding with purified recombinant proteins, cellular overexpression\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro reconstitution with multiple assays and cellular validation, domain mapping\",\n      \"pmids\": [\"33049998\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Splicing factor SFRS8 mediates alternative splicing of CACYBP pre-mRNA, reducing isoform 1 (NM_014412.3) and increasing isoform 2 (NM_001007214.1). Isoform switching alters the capacity of CACYBP to promote ubiquitination and degradation of β-catenin, linking the splicing event to Wnt/β-catenin pathway regulation and myeloma progression.\",\n      \"method\": \"RNA immunoprecipitation sequencing (RIP-seq), RIP-qPCR, Co-IP, RT-PCR isoform analysis, exosomal siRNA delivery, xenograft models\",\n      \"journal\": \"Clinical and translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — RIP-seq with validation by Co-IP and functional rescue, single lab\",\n      \"pmids\": [\"35184390\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CacyBP/SIP binds to MyD88 (a master regulator of innate immunity) and protects it from Siah-1-mediated proteasomal degradation by competitively binding to the MyD88 TIR domain. This CacyBP–MyD88 signaling axis drives HDAC1-mediated histone acetylation (H3K9ac and H3K27ac) at the CX3CL1 promoter, promoting CX3CL1 transcription and secretion, which in turn recruits tumor-associated macrophages.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence co-localization, ubiquitination assay, chromatin immunoprecipitation (H3K9ac/H3K27ac), in vitro and in vivo macrophage recruitment assays\",\n      \"journal\": \"Journal of experimental & clinical cancer research : CR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP with ubiquitination and ChIP assays, single lab\",\n      \"pmids\": [\"37968706\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ERK1/2 dephosphorylation by CacyBP/SIP in neuroblastoma NB2a cells reduces pCREB and BDNF mRNA levels in undifferentiated cells, whereas the effect is opposite in differentiated cells. The differential response is attributed to changes in CacyBP/SIP posttranslational modifications and protein ligands upon differentiation.\",\n      \"method\": \"CacyBP/SIP overexpression and siRNA silencing, western blotting for pERK1/2 and pCREB, RT-PCR for BDNF mRNA, 2D electrophoresis for PTM analysis\",\n      \"journal\": \"Neurochemistry international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — cellular gain/loss-of-function with downstream pathway readouts, single lab\",\n      \"pmids\": [\"27180052\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Gastrin stimulation induces nuclear translocation of CacyBP/SIP in gastric cancer cells, which promotes cell proliferation and cell cycle progression (G1/S transition). In colon cancer cells, gastrin-triggered nuclear translocation of CacyBP/SIP enhances interaction with SKP1, promoting proteasome-dependent degradation of p27kip1; this effect is blocked by the proteasome inhibitor MG132.\",\n      \"method\": \"Immunofluorescence, cellular fractionation/western blot, MTT/colony formation assays, flow cytometry, co-immunoprecipitation, MG132 inhibition\",\n      \"journal\": \"World journal of gastroenterology / PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — subcellular localization linked to functional outcome with mechanistic pathway placement, single lab\",\n      \"pmids\": [\"25110433\", \"28196083\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CacyBP/SIP is a multi-domain adaptor/scaffold protein that: (1) bridges Siah-1 to Skp1/Ebi in an SCF-type ubiquitin ligase complex driving phosphorylation-independent β-catenin degradation downstream of p53; (2) acts as a phosphatase for ERK1/2 and p38 MAP kinases, thereby modulating Elk-1/CREB/BDNF transcriptional programs; (3) directly binds and regulates actin polymerization and the actin–tropomyosin thin filament while simultaneously engaging tubulin; (4) promotes autophagy by suppressing BRUCE-dependent proteasomal degradation of LC3-I and facilitating BRUCE's autophagic destruction via Rab8; (5) is itself ubiquitinated and degraded by RNF41; (6) acts as an HSP90 co-chaperone that prevents α-synuclein aggregation; and (7) protects MyD88 from Siah-1-mediated degradation to regulate innate immune signaling and tumor microenvironment remodeling.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CACYBP (also known as SIP) is a multi-domain scaffold protein that participates in ubiquitin-dependent proteolysis, cytoskeletal regulation, MAP kinase dephosphorylation, and autophagy. Its best-characterized function is as an adaptor in a Siah-1/Skp1/Ebi SCF-type E3 ubiquitin ligase complex that targets β-catenin and cytoplasmic p27kip1 for proteasomal degradation downstream of p53 and metabolic stress, and knockout mice confirm its requirement for p53-induced β-catenin turnover, thymocyte development, and G1 cell-cycle arrest [PMID:11389839, PMID:16413921, PMID:21734459]. CACYBP directly binds actin and tropomyosin to modulate thin-filament organization and myosin ATPase activity, simultaneously engages tubulin, possesses intrinsic phosphatase activity toward ERK1/2 and p38 that tunes Elk-1/CREB/BDNF transcriptional programs, and acts as an HSP90 co-chaperone that suppresses α-synuclein aggregation [PMID:20637809, PMID:23266554, PMID:21110948, PMID:28283909, PMID:33049998]. Under basal conditions it sustains autophagy by stabilizing BRUCE/Apollon against Nrdp1-mediated degradation, while upon starvation it promotes Rab8-dependent autophagic destruction of BRUCE; it also protects MyD88 from Siah-1-mediated degradation, linking it to innate immune signaling and CX3CL1-driven macrophage recruitment [PMID:31213539, PMID:37968706].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Identifying CACYBP/SIP as the adaptor that bridges Siah-1 to Skp1/Ebi established an entirely new, phosphorylation-independent pathway for β-catenin degradation downstream of p53, answering how p53 can suppress Wnt signaling outside the canonical β-TrCP route.\",\n      \"evidence\": \"Co-immunoprecipitation, protein interaction mapping, and p53-induction assays in human cell lines\",\n      \"pmids\": [\"11389839\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Catalytic mechanism of the assembled Siah-1/SIP/Skp1/Ebi complex not reconstituted with purified components\", \"Relative contribution of this pathway versus β-TrCP in vivo unknown\", \"Post-translational regulation of SIP within the complex not addressed\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Defining the Ca²⁺-dependent interaction of CACYBP with multiple S100 proteins (S100A6, S100B, S100A1, S100A12, S100P) via its C-terminal SGS domain revealed a potential regulatory input through calcium signaling, while structural analysis of the Siah1 dimer showed the electrostatic basis of SIP recruitment.\",\n      \"evidence\": \"Affinity chromatography, ¹²⁵I-overlay, co-IP for S100 binding; crystal structure-guided mutagenesis for Siah1 interaction\",\n      \"pmids\": [\"12042313\", \"12421809\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of S100 binding on SIP's ubiquitin ligase adaptor activity not tested\", \"Whether S100 proteins and Siah-1 bind SIP simultaneously or compete was unresolved\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"NMR-based domain mapping resolved how SIP's modular architecture (N-terminal helical hairpin, CS domain, SGS domain) simultaneously engages Siah-1 (via the inter-domain linker) and Skp1 (via the CS domain), explaining the scaffolding mechanism at atomic resolution.\",\n      \"evidence\": \"Solution NMR spectroscopy with chemical shift perturbation mapping of individual domains\",\n      \"pmids\": [\"15996101\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No high-resolution structure of the full ternary SIP–Siah1–Skp1 complex\", \"Skp1 interaction was weak, raising questions about complex stability in vivo\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Genetic deletion of SIP in mice demonstrated its physiological requirement for p53-induced β-catenin degradation, thymocyte pre-TCR checkpoint, and G1 cell-cycle arrest, converting earlier biochemical observations into validated in vivo functions.\",\n      \"evidence\": \"SIP knockout mouse with thymocyte analysis, cell-cycle profiling, and β-catenin turnover assays in primary fibroblasts\",\n      \"pmids\": [\"16413921\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of β-catenin versus p27 degradation to the KO phenotypes not separated\", \"Tissue-specific conditional knockout studies not performed\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Discovery that CACYBP/SIP directly binds and inhibits ERK1/2 phosphorylation of Elk-1, with S100A6 competing for SIP binding, linked the calcium-sensing and MAP kinase signaling functions, answering how S100 proteins might regulate ERK output through SIP.\",\n      \"evidence\": \"Co-immunoprecipitation, in vitro kinase assay, E217K mutagenesis in NB2a neuroblastoma cells\",\n      \"pmids\": [\"19166809\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether the ERK-inhibitory effect is direct binding or catalytic dephosphorylation was unclear at this stage\", \"In vivo relevance of S100A6–ERK competition not demonstrated\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Two advances redefined CACYBP/SIP's functional breadth: it was shown to polymerize G-actin and simultaneously bind tubulin, bridging the two major cytoskeletal systems, and separately it was found to possess intrinsic phosphatase activity toward ERK1/2, with the E217K mutation abolishing catalysis.\",\n      \"evidence\": \"Co-sedimentation, cross-linking, electron microscopy, and cell migration assays for cytoskeletal work; p-nitrophenyl phosphate kinetic analysis and okadaic acid inhibition for phosphatase activity\",\n      \"pmids\": [\"20637809\", \"21110948\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Crystal structure of a SIP–actin or SIP–tubulin complex not determined\", \"Phosphatase catalytic mechanism not defined at the structural level\", \"Physiological substrate specificity of the phosphatase activity beyond ERK not mapped\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Extending the ubiquitin ligase adaptor role to cytoplasmic p27kip1 under glucose starvation, and linking p27 turnover to cell motility in SIP−/− fibroblasts, answered how metabolic stress co-opts the Siah1/SIP complex to regulate migration independently of β-catenin.\",\n      \"evidence\": \"SIP knockout fibroblasts, proteasome inhibitor treatment, cell motility assays\",\n      \"pmids\": [\"21734459\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct ubiquitination of p27 by the reconstituted complex not shown in vitro\", \"Whether SIP mediates p27 degradation in tissues beyond fibroblasts unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstrating that CACYBP/SIP binds tropomyosin and the actin–tropomyosin complex, altering tropomyosin conformation and modulating myosin ATPase activity, established SIP as a bona fide thin-filament regulatory protein beyond a simple actin-binding factor.\",\n      \"evidence\": \"AEDANS-fluorescence spectroscopy, co-sedimentation, electron microscopy, ATPase assays with purified proteins\",\n      \"pmids\": [\"23266554\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance in muscle or non-muscle cells not shown\", \"Binding stoichiometry along the thin filament not determined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Gastrin-induced nuclear translocation of CACYBP/SIP and its consequent enhancement of Skp1 interaction for p27 degradation revealed signal-dependent subcellular redistribution as a regulatory mechanism controlling cell proliferation.\",\n      \"evidence\": \"Immunofluorescence, cellular fractionation, co-IP, proteasome inhibition in gastric and colon cancer cells\",\n      \"pmids\": [\"25110433\", \"28196083\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of nuclear translocation (NLS, carrier protein) not identified\", \"Single-lab observation without independent replication\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Showing that CACYBP/SIP-dependent ERK1/2 dephosphorylation differentially regulates pCREB and BDNF expression in undifferentiated versus differentiated neuroblastoma cells answered how the same phosphatase activity produces context-dependent transcriptional outcomes.\",\n      \"evidence\": \"Overexpression/siRNA, western blot for pERK/pCREB, RT-PCR for BDNF, 2D electrophoresis for PTM changes in NB2a cells\",\n      \"pmids\": [\"27180052\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of differentiation-dependent PTMs or binding partners not characterized\", \"Not validated in primary neurons\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Extending phosphatase activity to p38 MAP kinase, with the CS domain as the catalytic region, and confirming the Siah1-dependent p27 ubiquitination mechanism in glioma cells broadened CACYBP/SIP's roles in stress signaling and tumor biology.\",\n      \"evidence\": \"In vitro phosphatase assays with domain truncations and H₂O₂ stress (p38); Co-IP, ubiquitination assay, siRNA epistasis, Transwell migration assays (p27/glioma)\",\n      \"pmids\": [\"28283909\", \"29024247\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of CS domain phosphatase activity unknown\", \"p38 dephosphorylation not validated in knockout cells\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Two studies revealed new layers of CACYBP/SIP regulation and function: it promotes autophagy by stabilizing BRUCE against Nrdp1-mediated degradation and facilitating starvation-induced BRUCE autophagic turnover via Rab8, while RNF41 was identified as the E3 ligase that ubiquitinates and degrades CACYBP itself, controlling its abundance and downstream effects on p27.\",\n      \"evidence\": \"CACYBP KO cell lines, autophagy flux assays, organelle fractionation, confocal imaging (autophagy); Co-IP, ubiquitination assay, domain mapping (RNF41)\",\n      \"pmids\": [\"31213539\", \"31754404\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological stimuli regulating RNF41–CACYBP axis unknown\", \"Whether autophagy promotion and ubiquitin ligase adaptor functions are coordinated or independent is unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identification of CACYBP/SIP as an HSP90 co-chaperone that directly prevents α-synuclein aggregation revealed a neuroprotective function, answering how it suppresses protein misfolding in neurodegenerative contexts.\",\n      \"evidence\": \"Thioflavin T fluorescence, ultracentrifugation, TEM, proximity ligation assay, cellular overexpression with rotenone treatment in HEK293 cells\",\n      \"pmids\": [\"33049998\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance in animal models of synucleinopathy not tested\", \"Whether chaperone function requires HSP90 or can act independently not fully dissected\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstrating that SFRS8-mediated alternative splicing switches CACYBP isoforms and alters β-catenin ubiquitination capacity linked RNA processing to the output of the Siah-1/SIP pathway, answering how CACYBP activity is regulated at the pre-mRNA level.\",\n      \"evidence\": \"RIP-seq, RIP-qPCR, Co-IP, RT-PCR isoform analysis, exosomal siRNA delivery, xenograft models in myeloma\",\n      \"pmids\": [\"35184390\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural differences between isoforms and their biochemical consequences not characterized\", \"Generalizability beyond myeloma not established\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Revealing that CACYBP/SIP protects MyD88 from Siah-1-mediated degradation and thereby drives HDAC1-dependent CX3CL1 transcription and macrophage recruitment established a new role for the SIP–Siah1 axis in innate immunity and tumor microenvironment remodeling.\",\n      \"evidence\": \"Co-IP, ubiquitination assay, ChIP for H3K9ac/H3K27ac, macrophage recruitment assays in vitro and in vivo\",\n      \"pmids\": [\"37968706\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether SIP competes with Siah-1 for MyD88 binding or allosterically blocks ubiquitination not mechanistically resolved\", \"Not validated in SIP-knockout immune cells\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Major unresolved questions include: (1) the structural basis of CACYBP/SIP's phosphatase activity and whether it represents a novel phosphatase fold; (2) how its multiple functions (ubiquitin ligase adaptor, phosphatase, cytoskeletal regulator, co-chaperone, autophagy promoter) are coordinated or compartmentalized within cells; and (3) the physiological hierarchy among its substrates (β-catenin, p27, ERK1/2, p38, BRUCE, MyD88, α-synuclein) in different tissue contexts.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No full-length high-resolution structure of CACYBP/SIP\", \"Conditional tissue-specific knockout studies not reported\", \"Systematic interactome under varying cellular conditions not performed\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 3, 4, 8, 11, 16]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [7, 10]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [6, 9]},\n      {\"term_id\": \"GO:0044183\", \"supporting_discovery_ids\": [14]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [5, 7, 10, 12, 17]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 6, 8]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [18]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [6, 9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 4, 5, 15, 17]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [4, 8, 13, 18]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 8, 11, 12, 13]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [12]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [16]}\n    ],\n    \"complexes\": [\n      \"Siah-1/SIP/Skp1/Ebi E3 ubiquitin ligase complex\"\n    ],\n    \"partners\": [\n      \"SIAH1\",\n      \"SKP1\",\n      \"BIRC6\",\n      \"S100A6\",\n      \"RNF41\",\n      \"MYD88\",\n      \"ACTB\",\n      \"SNCA\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}