{"gene":"CRIP2","run_date":"2026-04-28T17:28:53","timeline":{"discoveries":[{"year":2003,"finding":"CRP2 acts as a bridging molecule that associates with serum response factor (SRF) and GATA proteins; SRF-CRP2-GATA complexes strongly activate smooth muscle gene targets, and a dominant-negative CRP2 mutant blocked proepicardial cells from differentiating into smooth muscle cells.","method":"Co-immunoprecipitation, dominant-negative mutant, transcriptional reporter assays, cell differentiation assays","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 — reciprocal protein interactions, dominant-negative functional rescue, replicated with multiple smooth muscle gene targets","pmids":["12530967"],"is_preprint":false},{"year":2006,"finding":"In cardiomyocytes, CRP2 collaborates with Brg1 of the SWI/SNF complex, recruits SRF, and remodels smooth muscle target gene chromatin through histone acetylation to activate smooth muscle gene expression; LIM zinc fingers are required for this activity.","method":"Transgenic mice, protein transduction, chromatin immunoprecipitation, co-immunoprecipitation, reporter assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including transgenic model, protein transduction, and ChIP","pmids":["17185421"],"is_preprint":false},{"year":2004,"finding":"CRP2 is an autonomous F-actin-binding protein that directly binds actin filaments in vitro (co-sedimentation assay) and decorates actin stress fibres continuously in smooth muscle cells; binding to stress fibres is independent of alpha-actinin or zyxin localization, suggesting an actin filament-stabilising role.","method":"In vitro F-actin co-sedimentation assay, GFP live-cell imaging, mitochondrial targeting sequence fusion localization","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution co-sedimentation plus live-cell imaging with functional inference","pmids":["14741346"],"is_preprint":false},{"year":2011,"finding":"CRIP2 interacts with NF-κB/p65 to inhibit its DNA-binding ability at the promoter regions of proangiogenic cytokines IL6, IL8, and VEGF, thereby repressing their transcription and suppressing tumorigenesis and angiogenesis.","method":"Co-immunoprecipitation, chromatin immunoprecipitation, in vivo tumorigenesis assays (xenograft), re-expression functional complementation","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, ChIP, and in vivo functional rescue with multiple orthogonal methods","pmids":["21540330"],"is_preprint":false},{"year":2001,"finding":"CRP2 interacts selectively with PIAS1 (protein inhibitor of activated STAT1) through its C-terminal LIM domain, establishing CRP2 as a potential new factor in the JAK/STAT-signalling pathway.","method":"Yeast two-hybrid screen, co-immunoprecipitation, confocal co-localization","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 3 — yeast two-hybrid plus Co-IP and co-localization, single lab","pmids":["11672422"],"is_preprint":false},{"year":1997,"finding":"Solution structure of the C-terminal LIM domain (LIM2) of quail CRP2 was determined by NMR; the two zinc-binding modules (CCHC and CCCC) pack via a hydrophobic core, and an intermodular hydrogen bond/salt bridge between conserved Arg122 and Glu155 contributes to their relative orientation.","method":"Multidimensional homo- and heteronuclear NMR spectroscopy, 15N relaxation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — high-resolution NMR structure with functional validation of conserved residues","pmids":["9115265"],"is_preprint":false},{"year":1998,"finding":"Full-length quail CRP2 NMR structure reveals the two LIM domains are structurally and dynamically independent with no preferred relative orientation, supporting the model that CRP2 functions as an adaptor molecule arranging two or more proteins into macromolecular complexes.","method":"Multidimensional triple-resonance NMR spectroscopy, 15N relaxation (T1, T2, NOE), model-free analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — full-length NMR structure with backbone dynamics analysis","pmids":["9722554"],"is_preprint":false},{"year":2021,"finding":"CRIP2 is identified as a nuclear copper-binding protein that interacts with the copper chaperone Atox1 in the nucleus; Atox1 transfers copper to CRIP2, inducing a change in CRIP2's secondary structure that promotes its ubiquitin-mediated proteasomal degradation; CRIP2 depletion elevates ROS and activates autophagy.","method":"APEX2 proximity labeling, mass spectrometry, Co-IP, copper transfer assay, secondary structure analysis, proteasomal inhibition, ROS measurement, autophagy assay","journal":"Angewandte Chemie (International ed. in English)","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including proximity labeling, MS, Co-IP, and functional knockdown assays","pmids":["34550632"],"is_preprint":false},{"year":2018,"finding":"HOXA9 interacts with CRIP2 at glycolytic gene promoters to impede HIF-1α binding, thereby repressing HIF-1α-dependent transcription of HK2, GLUT1, and PDK1 and inhibiting glycolysis in cutaneous squamous cell carcinoma.","method":"Co-immunoprecipitation, chromatin immunoprecipitation, promoter reporter assays, in vitro and in vivo glycolysis assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — Co-IP plus ChIP and functional in vivo/in vitro assays with multiple readouts","pmids":["29662084"],"is_preprint":false},{"year":2016,"finding":"CRP2 localizes to the actin core of invadopodia in invasive breast cancer cells, autonomously crosslinks actin filaments into thick bundles in vitro, promotes ECM degradation and MMP-9 expression, and CRP2 knockdown reduces lung metastasis in xenograft models.","method":"Purified recombinant protein actin bundling assay, GFP localization, siRNA knockdown, invasion/ECM degradation assay, xenograft mouse model","journal":"Oncotarget","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro reconstitution of actin bundling plus in vivo xenograft functional validation","pmids":["26883198"],"is_preprint":false},{"year":2000,"finding":"CRP2 interacts specifically with a novel binding partner CRP2BP (CRP2 binding partner) via its LIM1 domain, as identified by yeast two-hybrid and confirmed in a cellular environment.","method":"Yeast two-hybrid, LIM domain deletion mapping","journal":"Biochemical and biophysical research communications","confidence":"Low","confidence_rationale":"Tier 3 — yeast two-hybrid only, limited follow-up","pmids":["10924333"],"is_preprint":false},{"year":2023,"finding":"CRP2 directly binds MRTF-A and MRTF-B and SRF to stabilize the MRTF/SRF/CArG-box transcriptional complex and activate smooth muscle cell gene expression in myofibroblasts; polar amino acids in the C-terminal half (Ser152, Glu154, Ser155, Thr156, Thr157, Thr159) are required for MRTF-A binding, and hydrophobic residues outside the LIM consensus (Trp139, Phe144, Leu153, Leu158) stabilize the LIM domain structure.","method":"Co-immunoprecipitation, siRNA knockdown, 3D structural analysis, mutagenesis, SMC gene reporter assays, invasion assay","journal":"Cell structure and function","confidence":"High","confidence_rationale":"Tier 2 — direct binding confirmed by Co-IP with mutagenesis and structural analysis plus functional readout","pmids":["37164693"],"is_preprint":false},{"year":2023,"finding":"CRP2BP acts as an adaptor protein (independent of its histone acetyltransferase activity) to enhance CRP2-MRTF/SRF complex function; p38MAPK activity positively regulates CRP2 expression and myofibroblastic gene expression, placing CRP2 downstream of a p38MAPK-CRP2 axis.","method":"siRNA knockdown, p38MAPK inhibitor, Western blot, co-immunoprecipitation, SMC gene expression assay","journal":"Cell structure and function","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis with inhibitor and KD, single lab","pmids":["37899269"],"is_preprint":false},{"year":2011,"finding":"CRIP2 localizes to the nucleus in esophageal squamous cell carcinoma cells (by subcellular fractionation), and its overexpression induces apoptosis through activation of caspases 3 and 9.","method":"Subcellular fractionation, caspase activity assay, colony formation, invasion assay","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2-3 — direct localization by fractionation plus mechanistic caspase readout, single lab","pmids":["22154084"],"is_preprint":false},{"year":2006,"finding":"TGF-β markedly stimulates CSRP2/CRP2 gene expression via the ALK5/Smad2/Smad3 signalling pathway in smooth muscle and hepatic stellate cells.","method":"TGF-β stimulation/sequestering experiments, ALK5 inhibitor (SB-431542), bisulfite genomic analysis, reporter assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — pharmacological epistasis with inhibitor plus genetic pathway placement, single lab","pmids":["16735029"],"is_preprint":false},{"year":2008,"finding":"Targeted disruption of Csrp2 in mice reveals that CRP2 has a bimodal subcellular distribution (actin filaments in cytosol and nucleus); CRP2-deficient cardiomyocytes display moderate hypertrophy and altered distribution of intercalated disc proteins (β-catenin, N-RAP, connexin-43).","method":"Gene targeting/knockout mouse, electron microscopy, histology, immunofluorescence","journal":"BMC developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 — clean KO with defined ultrastructural and protein distribution phenotype, single lab","pmids":["18713466"],"is_preprint":false},{"year":2014,"finding":"Zebrafish crip2 knockdown causes heart-looping defects and upregulates versican a and has2 ECM gene expression in the AV canal endocardium, demonstrating that Crip2 downregulates ECM component expression during atrioventricular valve development.","method":"Morpholino knockdown in zebrafish, in situ hybridization, qPCR","journal":"Molecules and cells","confidence":"Medium","confidence_rationale":"Tier 2 — loss-of-function in vivo with specific molecular pathway readout, single lab","pmids":["24823359"],"is_preprint":false},{"year":2025,"finding":"CRIP2 interacts with cytoskeleton proteins KRT8 and VIM in HUVECs; CRIP2 deficiency reduces their expression, disrupts cytoskeleton formation leading to hyperadhesion; CRIP2 also interacts with SRF and its absence disrupts the VEGFA/CDC42 signaling pathway and impairs PDGF/JAK/STAT/SRF signaling, reducing endothelial cell migration and proliferation.","method":"Co-immunoprecipitation, zebrafish knockout, siRNA knockdown in HUVECs, migration/adhesion/proliferation assays, signaling pathway analysis","journal":"Cellular and molecular life sciences : CMLS","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP of multiple partners plus in vivo zebrafish KO with pathway placement, single lab","pmids":["40074973"],"is_preprint":false},{"year":2026,"finding":"Crip2 (with Crip3) in zebrafish suppresses Notch signaling in hemogenic endothelium through NF-κB to enable hematopoietic stem and progenitor cell (HSPC) specification; Notch inhibition rescues HSPC generation in crip2/crip3 double mutants.","method":"Loss-of-function alleles (CRISPR), single-cell RNA-sequencing, Notch inhibitor rescue, genetic epistasis","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 — genetic KO with scRNA-seq and pharmacological rescue epistasis, single lab","pmids":["41601327"],"is_preprint":false},{"year":1998,"finding":"The Crp2/SmLim promoter contains functional Sp1-binding elements (-74 to -39) that confer basal promoter activity; in vivo, a 5-kb 5'-flanking fragment directed preferential expression in vascular smooth muscle cells of transgenic mice, demonstrating the presence of VSMC-specific regulatory elements.","method":"Deletion analysis, gel mobility shift assay, transient transfection, transgenic mice with lacZ reporter","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo transgenic promoter analysis with in vitro EMSA confirmation","pmids":["9553112"],"is_preprint":false}],"current_model":"CRIP2 (CSRP2) is a dual-LIM-domain adaptor protein with bimodal cytoplasmic/nuclear localization that (1) directly bundles F-actin to stabilize stress fibres and invadopodia actin cores, (2) assembles transcriptional complexes with SRF, MRTF-A/B, GATA factors, and Brg1/SWI-SNF to activate smooth muscle gene programs and (3) acts as a transcriptional repressor by interacting with NF-κB/p65 and HOXA9 at cytokine/glycolytic gene promoters; its activity is modulated by copper-induced structural change leading to proteasomal degradation (via Atox1), TGF-β/ALK5/Smad signaling, and p38MAPK, and it suppresses Notch signaling in hemogenic endothelium through NF-κB to support hematopoietic stem cell specification."},"narrative":{"teleology":[{"year":1997,"claim":"Determining how LIM domains are organized was essential for understanding CRIP2's adaptor function; NMR revealed that each LIM domain folds into two independent zinc-binding modules with a conserved intermodular interface, and full-length CRP2 has two structurally autonomous LIM domains with no fixed relative orientation, establishing the structural basis for simultaneous multi-partner engagement.","evidence":"Multidimensional NMR spectroscopy of quail CRP2 LIM2 domain and full-length protein with 15N relaxation dynamics","pmids":["9115265","9722554"],"confidence":"High","gaps":["No co-crystal or cryo-EM structure with any binding partner","How flexibility is constrained upon partner binding is unknown"]},{"year":1998,"claim":"The question of what directs CRIP2's preferential expression in vascular smooth muscle was answered by identifying Sp1-dependent basal promoter elements and VSMC-specific regulatory regions in the 5′-flanking sequence.","evidence":"Deletion/EMSA analysis and lacZ-reporter transgenic mice","pmids":["9553112"],"confidence":"Medium","gaps":["Identity of the VSMC-specific trans-acting factors beyond Sp1 is unknown","Enhancer elements for non-vascular expression contexts not mapped"]},{"year":2003,"claim":"A key question was whether CRIP2 acts in transcription or only at the cytoskeleton; discovery that CRP2 bridges SRF and GATA proteins to activate smooth muscle gene promoters — and that dominant-negative CRP2 blocks smooth muscle differentiation — established CRIP2 as a transcriptional co-activator essential for smooth muscle cell fate.","evidence":"Co-immunoprecipitation, transcriptional reporter assays, dominant-negative mutant blocking proepicardial cell differentiation","pmids":["12530967"],"confidence":"High","gaps":["Whether CRP2 contacts DNA directly or only acts through protein–protein bridging was not resolved","Relative contribution of LIM1 vs LIM2 to SRF vs GATA binding not fully dissected"]},{"year":2004,"claim":"Whether CRIP2 has a direct cytoskeletal function independent of other actin-binding proteins was unclear; in vitro co-sedimentation showed that CRP2 autonomously binds F-actin and decorates stress fibres independently of α-actinin or zyxin, establishing a direct actin-stabilizing role.","evidence":"Recombinant protein F-actin co-sedimentation assay and GFP live-cell imaging in smooth muscle cells","pmids":["14741346"],"confidence":"High","gaps":["Actin-binding interface on CRP2 not mapped","Whether CRP2 bundles or merely side-binds actin was not yet determined"]},{"year":2006,"claim":"How CRIP2 activates smooth muscle genes at the chromatin level was unknown; the finding that CRP2 recruits Brg1/SWI-SNF to SRF-occupied smooth muscle gene promoters and promotes histone acetylation revealed a chromatin-remodeling mechanism, while TGF-β/ALK5/Smad signaling was identified as an upstream transcriptional inducer of CRP2 expression.","evidence":"Transgenic mice, protein transduction, ChIP for Brg1 and histone acetylation; pharmacological ALK5 inhibition (SB-431542) in smooth muscle and hepatic stellate cells","pmids":["17185421","16735029"],"confidence":"High","gaps":["Whether Brg1 binds CRP2 directly or through SRF is unresolved","Smad-responsive elements in the CRIP2 promoter not mapped"]},{"year":2008,"claim":"The in vivo requirement for CRIP2 was tested by gene knockout; Csrp2-deficient mice showed cardiomyocyte hypertrophy and mislocalization of intercalated disc proteins (β-catenin, N-RAP, connexin-43), confirming a bimodal cytoplasm/nucleus distribution and a role in cardiac cell architecture.","evidence":"Gene-targeted Csrp2 knockout mouse with electron microscopy and immunofluorescence","pmids":["18713466"],"confidence":"Medium","gaps":["Mechanism connecting CRP2 loss to intercalated disc remodeling is unknown","No overt vascular smooth muscle phenotype was described despite high VSMC expression"]},{"year":2011,"claim":"Whether CRIP2 functions as a transcriptional repressor was unknown; the demonstration that CRIP2 interacts with NF-κB/p65 to block its binding at IL6, IL8, and VEGF promoters revealed a tumor-suppressive repressor function distinct from its smooth muscle co-activator role.","evidence":"Co-IP, ChIP, and in vivo xenograft tumorigenesis assays with re-expression complementation in nasopharyngeal carcinoma cells","pmids":["21540330"],"confidence":"High","gaps":["Whether CRP2 competes with NF-κB co-activators or directly modifies p65 is unclear","Generalizability beyond nasopharyngeal carcinoma not established"]},{"year":2016,"claim":"Beyond stress fibre association, CRIP2's ability to actively organize actin architecture was demonstrated by showing that purified CRP2 autonomously crosslinks actin filaments into thick bundles and localizes to invadopodia actin cores, with CRP2 knockdown reducing ECM degradation and lung metastasis.","evidence":"Recombinant protein actin bundling assay, siRNA knockdown, ECM degradation assay, and xenograft lung metastasis model in breast cancer cells","pmids":["26883198"],"confidence":"High","gaps":["Bundling stoichiometry and geometry not determined","Whether bundling and transcriptional activities are separable in cancer cells is untested"]},{"year":2018,"claim":"A second transcriptional repressor mechanism was identified: HOXA9 recruits CRIP2 to glycolytic gene promoters (HK2, GLUT1, PDK1) to occlude HIF-1α binding, establishing CRIP2 as a metabolic brake on glycolysis in squamous cell carcinoma.","evidence":"Co-IP, ChIP at glycolytic gene promoters, promoter reporters, in vitro and in vivo glycolysis measurements","pmids":["29662084"],"confidence":"High","gaps":["Whether CRIP2 directly contacts DNA at these promoters or acts solely via HOXA9 is unclear","Applicability to non-cancer metabolic regulation unknown"]},{"year":2021,"claim":"How CRIP2 protein levels are regulated post-translationally was unknown; Atox1 was found to transfer copper to CRIP2 in the nucleus, inducing a secondary structure change that triggers ubiquitin-mediated proteasomal degradation, linking copper homeostasis to CRIP2 stability and downstream ROS/autophagy control.","evidence":"APEX2 proximity labeling, mass spectrometry, Co-IP, copper transfer assay, secondary structure analysis, proteasome inhibition, ROS and autophagy assays","pmids":["34550632"],"confidence":"High","gaps":["Identity of the E3 ubiquitin ligase is unknown","Which CRIP2 zinc-binding sites accept copper is not mapped","Whether copper-induced degradation occurs in vivo is not confirmed"]},{"year":2023,"claim":"The identity of the co-activator linking CRIP2 to the myocardin-related transcription factor pathway was resolved: CRIP2 directly binds MRTF-A and MRTF-B via specific polar residues in the C-terminal LIM domain to stabilize the MRTF/SRF/CArG-box complex; CRP2BP acts as a scaffolding adaptor (independent of its HAT activity) to enhance this complex, and p38 MAPK positively regulates CRIP2 expression.","evidence":"Co-IP with systematic mutagenesis, 3D structural analysis, siRNA knockdown, p38 MAPK inhibitor epistasis in myofibroblasts","pmids":["37164693","37899269"],"confidence":"High","gaps":["Whether MRTF binding and actin bundling are mutually exclusive is untested","Whether p38 MAPK acts on CRIP2 promoter or mRNA stability is unknown"]},{"year":2025,"claim":"CRIP2's cytoskeletal role in endothelial cells was clarified: CRIP2 interacts with KRT8 and VIM to maintain cytoskeleton integrity and normal adhesion, and its loss disrupts VEGFA/CDC42 and PDGF/JAK/STAT/SRF signaling, impairing endothelial migration and proliferation, while in zebrafish, CRIP2 suppresses Notch signaling through NF-κB in hemogenic endothelium to enable hematopoietic stem cell specification.","evidence":"Co-IP in HUVECs, siRNA knockdown, zebrafish CRISPR knockout, scRNA-seq, Notch inhibitor rescue epistasis","pmids":["40074973","41601327"],"confidence":"Medium","gaps":["Whether CRIP2–NF-κB interaction in hemogenic endothelium uses the same mechanism as in cancer cells is unknown","Mammalian hematopoietic phenotype of CRIP2 loss not examined","KRT8/VIM interactions not validated by reciprocal pull-down"]},{"year":null,"claim":"Key open questions include: the structural basis of CRIP2's simultaneous engagement of actin and transcriptional partners, the identity of the E3 ligase mediating copper-dependent degradation, whether actin-bundling and transcriptional functions are spatially or temporally segregated in vivo, and the mechanism by which CRIP2 modulates Notch signaling in mammalian hematopoiesis.","evidence":"","pmids":[],"confidence":"Low","gaps":["No co-structure of CRIP2 with any binding partner exists","E3 ligase for copper-triggered degradation unidentified","Separation-of-function mutations distinguishing cytoskeletal and nuclear roles not generated"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[2,9,17]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,1,3,8,11]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1,6,11,12]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[7,13,15]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[2,9,15,17]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[2,15]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,1,3,8,11]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[1]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[3,14,17,18]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,16,18]}],"complexes":["MRTF/SRF/CArG-box complex","SRF-CRP2-GATA complex","CRP2-Brg1/SWI-SNF complex"],"partners":["SRF","MRTFA","MRTFB","RELA","HOXA9","ATOX1","BRG1","CRP2BP"],"other_free_text":[]},"mechanistic_narrative":"CRIP2 (also known as CSRP2/CRP2) is a dual-LIM-domain adaptor protein that functions in both the cytoplasm and nucleus to coordinate actin cytoskeleton organization and transcriptional regulation. Its two structurally independent LIM domains enable simultaneous engagement of multiple partners: CRIP2 directly binds and bundles F-actin filaments to stabilize stress fibres and invadopodia actin cores [PMID:14741346, PMID:26883198], and it assembles transcriptional complexes with SRF, GATA factors, MRTF-A/B, and the Brg1/SWI-SNF chromatin-remodeling complex to activate smooth muscle cell gene programs [PMID:12530967, PMID:17185421, PMID:37164693]. CRIP2 also functions as a transcriptional repressor by interacting with NF-κB/p65 to suppress proangiogenic cytokine expression and with HOXA9 to impede HIF-1α-dependent glycolytic gene transcription [PMID:21540330, PMID:29662084]. Its expression is regulated by TGF-β/ALK5/Smad signaling and p38 MAPK [PMID:16735029, PMID:37899269], and nuclear copper transfer from Atox1 induces a conformational change that targets CRIP2 for ubiquitin-mediated proteasomal degradation [PMID:34550632]."},"prefetch_data":{"uniprot":{"accession":"P52943","full_name":"Cysteine-rich protein 2","aliases":["Protein ESP1"],"length_aa":208,"mass_kda":22.5,"function":"","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/P52943/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CRIP2","classification":"Not Classified","n_dependent_lines":7,"n_total_lines":1208,"dependency_fraction":0.005794701986754967},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CRIP2","total_profiled":1310},"omim":[{"mim_id":"601183","title":"CYSTEINE-RICH INTESTINAL PROTEIN 2; CRIP2","url":"https://www.omim.org/entry/601183"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoli","reliability":"Approved"},{"location":"Nucleoplasm","reliability":"Additional"},{"location":"Plasma membrane","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"blood vessel","ntpm":641.8},{"tissue":"heart muscle","ntpm":1152.2}],"url":"https://www.proteinatlas.org/search/CRIP2"},"hgnc":{"alias_symbol":["CRP2","ESP1"],"prev_symbol":[]},"alphafold":{"accession":"P52943","domains":[{"cath_id":"2.10.110.10","chopping":"16-61","consensus_level":"high","plddt":87.4235,"start":16,"end":61},{"cath_id":"2.10.110.10","chopping":"137-182","consensus_level":"high","plddt":88.6326,"start":137,"end":182}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P52943","model_url":"https://alphafold.ebi.ac.uk/files/AF-P52943-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P52943-F1-predicted_aligned_error_v6.png","plddt_mean":72.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CRIP2","jax_strain_url":"https://www.jax.org/strain/search?query=CRIP2"},"sequence":{"accession":"P52943","fasta_url":"https://rest.uniprot.org/uniprotkb/P52943.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P52943/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P52943"}},"corpus_meta":[{"pmid":"9635435","id":"PMC_9635435","title":"An ESP1/PDS1 complex regulates loss of sister chromatid cohesion at the metaphase to anaphase transition in yeast.","date":"1998","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/9635435","citation_count":520,"is_preprint":false},{"pmid":"20596023","id":"PMC_20596023","title":"The male mouse pheromone ESP1 enhances female sexual receptive behaviour through a specific vomeronasal receptor.","date":"2010","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/20596023","citation_count":269,"is_preprint":false},{"pmid":"12530967","id":"PMC_12530967","title":"Cysteine-rich LIM-only proteins CRP1 and CRP2 are potent smooth muscle differentiation cofactors.","date":"2003","source":"Developmental cell","url":"https://pubmed.ncbi.nlm.nih.gov/12530967","citation_count":210,"is_preprint":false},{"pmid":"7621830","id":"PMC_7621830","title":"CRP2 (C/EBP beta) contains a bipartite regulatory domain that controls transcriptional activation, DNA binding and cell specificity.","date":"1995","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/7621830","citation_count":199,"is_preprint":false},{"pmid":"10444592","id":"PMC_10444592","title":"Pds1 and Esp1 control both anaphase and mitotic exit in normal cells and after DNA damage.","date":"1999","source":"Genes & development","url":"https://pubmed.ncbi.nlm.nih.gov/10444592","citation_count":142,"is_preprint":false},{"pmid":"2203537","id":"PMC_2203537","title":"The fission yeast cut1+ gene regulates spindle pole body duplication and has homology to the budding yeast ESP1 gene.","date":"1990","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/2203537","citation_count":137,"is_preprint":false},{"pmid":"11149918","id":"PMC_11149918","title":"A novel role of the budding yeast separin Esp1 in anaphase spindle elongation: evidence that proper spindle association of Esp1 is regulated by Pds1.","date":"2001","source":"The Journal of cell 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SRF-CRP2-GATA complexes strongly activate smooth muscle gene targets, and a dominant-negative CRP2 mutant blocked proepicardial cells from differentiating into smooth muscle cells.\",\n      \"method\": \"Co-immunoprecipitation, dominant-negative mutant, transcriptional reporter assays, cell differentiation assays\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal protein interactions, dominant-negative functional rescue, replicated with multiple smooth muscle gene targets\",\n      \"pmids\": [\"12530967\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"In cardiomyocytes, CRP2 collaborates with Brg1 of the SWI/SNF complex, recruits SRF, and remodels smooth muscle target gene chromatin through histone acetylation to activate smooth muscle gene expression; LIM zinc fingers are required for this activity.\",\n      \"method\": \"Transgenic mice, protein transduction, chromatin immunoprecipitation, co-immunoprecipitation, reporter assays\",\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 including transgenic model, protein transduction, and ChIP\",\n      \"pmids\": [\"17185421\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"CRP2 is an autonomous F-actin-binding protein that directly binds actin filaments in vitro (co-sedimentation assay) and decorates actin stress fibres continuously in smooth muscle cells; binding to stress fibres is independent of alpha-actinin or zyxin localization, suggesting an actin filament-stabilising role.\",\n      \"method\": \"In vitro F-actin co-sedimentation assay, GFP live-cell imaging, mitochondrial targeting sequence fusion localization\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution co-sedimentation plus live-cell imaging with functional inference\",\n      \"pmids\": [\"14741346\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CRIP2 interacts with NF-κB/p65 to inhibit its DNA-binding ability at the promoter regions of proangiogenic cytokines IL6, IL8, and VEGF, thereby repressing their transcription and suppressing tumorigenesis and angiogenesis.\",\n      \"method\": \"Co-immunoprecipitation, chromatin immunoprecipitation, in vivo tumorigenesis assays (xenograft), re-expression functional complementation\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, ChIP, and in vivo functional rescue with multiple orthogonal methods\",\n      \"pmids\": [\"21540330\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"CRP2 interacts selectively with PIAS1 (protein inhibitor of activated STAT1) through its C-terminal LIM domain, establishing CRP2 as a potential new factor in the JAK/STAT-signalling pathway.\",\n      \"method\": \"Yeast two-hybrid screen, co-immunoprecipitation, confocal co-localization\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — yeast two-hybrid plus Co-IP and co-localization, single lab\",\n      \"pmids\": [\"11672422\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Solution structure of the C-terminal LIM domain (LIM2) of quail CRP2 was determined by NMR; the two zinc-binding modules (CCHC and CCCC) pack via a hydrophobic core, and an intermodular hydrogen bond/salt bridge between conserved Arg122 and Glu155 contributes to their relative orientation.\",\n      \"method\": \"Multidimensional homo- and heteronuclear NMR spectroscopy, 15N relaxation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution NMR structure with functional validation of conserved residues\",\n      \"pmids\": [\"9115265\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Full-length quail CRP2 NMR structure reveals the two LIM domains are structurally and dynamically independent with no preferred relative orientation, supporting the model that CRP2 functions as an adaptor molecule arranging two or more proteins into macromolecular complexes.\",\n      \"method\": \"Multidimensional triple-resonance NMR spectroscopy, 15N relaxation (T1, T2, NOE), model-free analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — full-length NMR structure with backbone dynamics analysis\",\n      \"pmids\": [\"9722554\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CRIP2 is identified as a nuclear copper-binding protein that interacts with the copper chaperone Atox1 in the nucleus; Atox1 transfers copper to CRIP2, inducing a change in CRIP2's secondary structure that promotes its ubiquitin-mediated proteasomal degradation; CRIP2 depletion elevates ROS and activates autophagy.\",\n      \"method\": \"APEX2 proximity labeling, mass spectrometry, Co-IP, copper transfer assay, secondary structure analysis, proteasomal inhibition, ROS measurement, autophagy assay\",\n      \"journal\": \"Angewandte Chemie (International ed. in English)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including proximity labeling, MS, Co-IP, and functional knockdown assays\",\n      \"pmids\": [\"34550632\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"HOXA9 interacts with CRIP2 at glycolytic gene promoters to impede HIF-1α binding, thereby repressing HIF-1α-dependent transcription of HK2, GLUT1, and PDK1 and inhibiting glycolysis in cutaneous squamous cell carcinoma.\",\n      \"method\": \"Co-immunoprecipitation, chromatin immunoprecipitation, promoter reporter assays, in vitro and in vivo glycolysis assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus ChIP and functional in vivo/in vitro assays with multiple readouts\",\n      \"pmids\": [\"29662084\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CRP2 localizes to the actin core of invadopodia in invasive breast cancer cells, autonomously crosslinks actin filaments into thick bundles in vitro, promotes ECM degradation and MMP-9 expression, and CRP2 knockdown reduces lung metastasis in xenograft models.\",\n      \"method\": \"Purified recombinant protein actin bundling assay, GFP localization, siRNA knockdown, invasion/ECM degradation assay, xenograft mouse model\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro reconstitution of actin bundling plus in vivo xenograft functional validation\",\n      \"pmids\": [\"26883198\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"CRP2 interacts specifically with a novel binding partner CRP2BP (CRP2 binding partner) via its LIM1 domain, as identified by yeast two-hybrid and confirmed in a cellular environment.\",\n      \"method\": \"Yeast two-hybrid, LIM domain deletion mapping\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — yeast two-hybrid only, limited follow-up\",\n      \"pmids\": [\"10924333\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CRP2 directly binds MRTF-A and MRTF-B and SRF to stabilize the MRTF/SRF/CArG-box transcriptional complex and activate smooth muscle cell gene expression in myofibroblasts; polar amino acids in the C-terminal half (Ser152, Glu154, Ser155, Thr156, Thr157, Thr159) are required for MRTF-A binding, and hydrophobic residues outside the LIM consensus (Trp139, Phe144, Leu153, Leu158) stabilize the LIM domain structure.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, 3D structural analysis, mutagenesis, SMC gene reporter assays, invasion assay\",\n      \"journal\": \"Cell structure and function\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct binding confirmed by Co-IP with mutagenesis and structural analysis plus functional readout\",\n      \"pmids\": [\"37164693\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CRP2BP acts as an adaptor protein (independent of its histone acetyltransferase activity) to enhance CRP2-MRTF/SRF complex function; p38MAPK activity positively regulates CRP2 expression and myofibroblastic gene expression, placing CRP2 downstream of a p38MAPK-CRP2 axis.\",\n      \"method\": \"siRNA knockdown, p38MAPK inhibitor, Western blot, co-immunoprecipitation, SMC gene expression assay\",\n      \"journal\": \"Cell structure and function\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with inhibitor and KD, single lab\",\n      \"pmids\": [\"37899269\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CRIP2 localizes to the nucleus in esophageal squamous cell carcinoma cells (by subcellular fractionation), and its overexpression induces apoptosis through activation of caspases 3 and 9.\",\n      \"method\": \"Subcellular fractionation, caspase activity assay, colony formation, invasion assay\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — direct localization by fractionation plus mechanistic caspase readout, single lab\",\n      \"pmids\": [\"22154084\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"TGF-β markedly stimulates CSRP2/CRP2 gene expression via the ALK5/Smad2/Smad3 signalling pathway in smooth muscle and hepatic stellate cells.\",\n      \"method\": \"TGF-β stimulation/sequestering experiments, ALK5 inhibitor (SB-431542), bisulfite genomic analysis, reporter assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological epistasis with inhibitor plus genetic pathway placement, single lab\",\n      \"pmids\": [\"16735029\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Targeted disruption of Csrp2 in mice reveals that CRP2 has a bimodal subcellular distribution (actin filaments in cytosol and nucleus); CRP2-deficient cardiomyocytes display moderate hypertrophy and altered distribution of intercalated disc proteins (β-catenin, N-RAP, connexin-43).\",\n      \"method\": \"Gene targeting/knockout mouse, electron microscopy, histology, immunofluorescence\",\n      \"journal\": \"BMC developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined ultrastructural and protein distribution phenotype, single lab\",\n      \"pmids\": [\"18713466\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Zebrafish crip2 knockdown causes heart-looping defects and upregulates versican a and has2 ECM gene expression in the AV canal endocardium, demonstrating that Crip2 downregulates ECM component expression during atrioventricular valve development.\",\n      \"method\": \"Morpholino knockdown in zebrafish, in situ hybridization, qPCR\",\n      \"journal\": \"Molecules and cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function in vivo with specific molecular pathway readout, single lab\",\n      \"pmids\": [\"24823359\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CRIP2 interacts with cytoskeleton proteins KRT8 and VIM in HUVECs; CRIP2 deficiency reduces their expression, disrupts cytoskeleton formation leading to hyperadhesion; CRIP2 also interacts with SRF and its absence disrupts the VEGFA/CDC42 signaling pathway and impairs PDGF/JAK/STAT/SRF signaling, reducing endothelial cell migration and proliferation.\",\n      \"method\": \"Co-immunoprecipitation, zebrafish knockout, siRNA knockdown in HUVECs, migration/adhesion/proliferation assays, signaling pathway analysis\",\n      \"journal\": \"Cellular and molecular life sciences : CMLS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP of multiple partners plus in vivo zebrafish KO with pathway placement, single lab\",\n      \"pmids\": [\"40074973\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Crip2 (with Crip3) in zebrafish suppresses Notch signaling in hemogenic endothelium through NF-κB to enable hematopoietic stem and progenitor cell (HSPC) specification; Notch inhibition rescues HSPC generation in crip2/crip3 double mutants.\",\n      \"method\": \"Loss-of-function alleles (CRISPR), single-cell RNA-sequencing, Notch inhibitor rescue, genetic epistasis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with scRNA-seq and pharmacological rescue epistasis, single lab\",\n      \"pmids\": [\"41601327\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The Crp2/SmLim promoter contains functional Sp1-binding elements (-74 to -39) that confer basal promoter activity; in vivo, a 5-kb 5'-flanking fragment directed preferential expression in vascular smooth muscle cells of transgenic mice, demonstrating the presence of VSMC-specific regulatory elements.\",\n      \"method\": \"Deletion analysis, gel mobility shift assay, transient transfection, transgenic mice with lacZ reporter\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo transgenic promoter analysis with in vitro EMSA confirmation\",\n      \"pmids\": [\"9553112\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CRIP2 (CSRP2) is a dual-LIM-domain adaptor protein with bimodal cytoplasmic/nuclear localization that (1) directly bundles F-actin to stabilize stress fibres and invadopodia actin cores, (2) assembles transcriptional complexes with SRF, MRTF-A/B, GATA factors, and Brg1/SWI-SNF to activate smooth muscle gene programs and (3) acts as a transcriptional repressor by interacting with NF-κB/p65 and HOXA9 at cytokine/glycolytic gene promoters; its activity is modulated by copper-induced structural change leading to proteasomal degradation (via Atox1), TGF-β/ALK5/Smad signaling, and p38MAPK, and it suppresses Notch signaling in hemogenic endothelium through NF-κB to support hematopoietic stem cell specification.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CRIP2 (also known as CSRP2/CRP2) is a dual-LIM-domain adaptor protein that functions in both the cytoplasm and nucleus to coordinate actin cytoskeleton organization and transcriptional regulation. Its two structurally independent LIM domains enable simultaneous engagement of multiple partners: CRIP2 directly binds and bundles F-actin filaments to stabilize stress fibres and invadopodia actin cores [PMID:14741346, PMID:26883198], and it assembles transcriptional complexes with SRF, GATA factors, MRTF-A/B, and the Brg1/SWI-SNF chromatin-remodeling complex to activate smooth muscle cell gene programs [PMID:12530967, PMID:17185421, PMID:37164693]. CRIP2 also functions as a transcriptional repressor by interacting with NF-κB/p65 to suppress proangiogenic cytokine expression and with HOXA9 to impede HIF-1α-dependent glycolytic gene transcription [PMID:21540330, PMID:29662084]. Its expression is regulated by TGF-β/ALK5/Smad signaling and p38 MAPK [PMID:16735029, PMID:37899269], and nuclear copper transfer from Atox1 induces a conformational change that targets CRIP2 for ubiquitin-mediated proteasomal degradation [PMID:34550632].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Determining how LIM domains are organized was essential for understanding CRIP2's adaptor function; NMR revealed that each LIM domain folds into two independent zinc-binding modules with a conserved intermodular interface, and full-length CRP2 has two structurally autonomous LIM domains with no fixed relative orientation, establishing the structural basis for simultaneous multi-partner engagement.\",\n      \"evidence\": \"Multidimensional NMR spectroscopy of quail CRP2 LIM2 domain and full-length protein with 15N relaxation dynamics\",\n      \"pmids\": [\"9115265\", \"9722554\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No co-crystal or cryo-EM structure with any binding partner\", \"How flexibility is constrained upon partner binding is unknown\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"The question of what directs CRIP2's preferential expression in vascular smooth muscle was answered by identifying Sp1-dependent basal promoter elements and VSMC-specific regulatory regions in the 5′-flanking sequence.\",\n      \"evidence\": \"Deletion/EMSA analysis and lacZ-reporter transgenic mice\",\n      \"pmids\": [\"9553112\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of the VSMC-specific trans-acting factors beyond Sp1 is unknown\", \"Enhancer elements for non-vascular expression contexts not mapped\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"A key question was whether CRIP2 acts in transcription or only at the cytoskeleton; discovery that CRP2 bridges SRF and GATA proteins to activate smooth muscle gene promoters — and that dominant-negative CRP2 blocks smooth muscle differentiation — established CRIP2 as a transcriptional co-activator essential for smooth muscle cell fate.\",\n      \"evidence\": \"Co-immunoprecipitation, transcriptional reporter assays, dominant-negative mutant blocking proepicardial cell differentiation\",\n      \"pmids\": [\"12530967\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CRP2 contacts DNA directly or only acts through protein–protein bridging was not resolved\", \"Relative contribution of LIM1 vs LIM2 to SRF vs GATA binding not fully dissected\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Whether CRIP2 has a direct cytoskeletal function independent of other actin-binding proteins was unclear; in vitro co-sedimentation showed that CRP2 autonomously binds F-actin and decorates stress fibres independently of α-actinin or zyxin, establishing a direct actin-stabilizing role.\",\n      \"evidence\": \"Recombinant protein F-actin co-sedimentation assay and GFP live-cell imaging in smooth muscle cells\",\n      \"pmids\": [\"14741346\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Actin-binding interface on CRP2 not mapped\", \"Whether CRP2 bundles or merely side-binds actin was not yet determined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"How CRIP2 activates smooth muscle genes at the chromatin level was unknown; the finding that CRP2 recruits Brg1/SWI-SNF to SRF-occupied smooth muscle gene promoters and promotes histone acetylation revealed a chromatin-remodeling mechanism, while TGF-β/ALK5/Smad signaling was identified as an upstream transcriptional inducer of CRP2 expression.\",\n      \"evidence\": \"Transgenic mice, protein transduction, ChIP for Brg1 and histone acetylation; pharmacological ALK5 inhibition (SB-431542) in smooth muscle and hepatic stellate cells\",\n      \"pmids\": [\"17185421\", \"16735029\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Brg1 binds CRP2 directly or through SRF is unresolved\", \"Smad-responsive elements in the CRIP2 promoter not mapped\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"The in vivo requirement for CRIP2 was tested by gene knockout; Csrp2-deficient mice showed cardiomyocyte hypertrophy and mislocalization of intercalated disc proteins (β-catenin, N-RAP, connexin-43), confirming a bimodal cytoplasm/nucleus distribution and a role in cardiac cell architecture.\",\n      \"evidence\": \"Gene-targeted Csrp2 knockout mouse with electron microscopy and immunofluorescence\",\n      \"pmids\": [\"18713466\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism connecting CRP2 loss to intercalated disc remodeling is unknown\", \"No overt vascular smooth muscle phenotype was described despite high VSMC expression\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Whether CRIP2 functions as a transcriptional repressor was unknown; the demonstration that CRIP2 interacts with NF-κB/p65 to block its binding at IL6, IL8, and VEGF promoters revealed a tumor-suppressive repressor function distinct from its smooth muscle co-activator role.\",\n      \"evidence\": \"Co-IP, ChIP, and in vivo xenograft tumorigenesis assays with re-expression complementation in nasopharyngeal carcinoma cells\",\n      \"pmids\": [\"21540330\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CRP2 competes with NF-κB co-activators or directly modifies p65 is unclear\", \"Generalizability beyond nasopharyngeal carcinoma not established\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Beyond stress fibre association, CRIP2's ability to actively organize actin architecture was demonstrated by showing that purified CRP2 autonomously crosslinks actin filaments into thick bundles and localizes to invadopodia actin cores, with CRP2 knockdown reducing ECM degradation and lung metastasis.\",\n      \"evidence\": \"Recombinant protein actin bundling assay, siRNA knockdown, ECM degradation assay, and xenograft lung metastasis model in breast cancer cells\",\n      \"pmids\": [\"26883198\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Bundling stoichiometry and geometry not determined\", \"Whether bundling and transcriptional activities are separable in cancer cells is untested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"A second transcriptional repressor mechanism was identified: HOXA9 recruits CRIP2 to glycolytic gene promoters (HK2, GLUT1, PDK1) to occlude HIF-1α binding, establishing CRIP2 as a metabolic brake on glycolysis in squamous cell carcinoma.\",\n      \"evidence\": \"Co-IP, ChIP at glycolytic gene promoters, promoter reporters, in vitro and in vivo glycolysis measurements\",\n      \"pmids\": [\"29662084\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CRIP2 directly contacts DNA at these promoters or acts solely via HOXA9 is unclear\", \"Applicability to non-cancer metabolic regulation unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"How CRIP2 protein levels are regulated post-translationally was unknown; Atox1 was found to transfer copper to CRIP2 in the nucleus, inducing a secondary structure change that triggers ubiquitin-mediated proteasomal degradation, linking copper homeostasis to CRIP2 stability and downstream ROS/autophagy control.\",\n      \"evidence\": \"APEX2 proximity labeling, mass spectrometry, Co-IP, copper transfer assay, secondary structure analysis, proteasome inhibition, ROS and autophagy assays\",\n      \"pmids\": [\"34550632\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the E3 ubiquitin ligase is unknown\", \"Which CRIP2 zinc-binding sites accept copper is not mapped\", \"Whether copper-induced degradation occurs in vivo is not confirmed\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"The identity of the co-activator linking CRIP2 to the myocardin-related transcription factor pathway was resolved: CRIP2 directly binds MRTF-A and MRTF-B via specific polar residues in the C-terminal LIM domain to stabilize the MRTF/SRF/CArG-box complex; CRP2BP acts as a scaffolding adaptor (independent of its HAT activity) to enhance this complex, and p38 MAPK positively regulates CRIP2 expression.\",\n      \"evidence\": \"Co-IP with systematic mutagenesis, 3D structural analysis, siRNA knockdown, p38 MAPK inhibitor epistasis in myofibroblasts\",\n      \"pmids\": [\"37164693\", \"37899269\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether MRTF binding and actin bundling are mutually exclusive is untested\", \"Whether p38 MAPK acts on CRIP2 promoter or mRNA stability is unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"CRIP2's cytoskeletal role in endothelial cells was clarified: CRIP2 interacts with KRT8 and VIM to maintain cytoskeleton integrity and normal adhesion, and its loss disrupts VEGFA/CDC42 and PDGF/JAK/STAT/SRF signaling, impairing endothelial migration and proliferation, while in zebrafish, CRIP2 suppresses Notch signaling through NF-κB in hemogenic endothelium to enable hematopoietic stem cell specification.\",\n      \"evidence\": \"Co-IP in HUVECs, siRNA knockdown, zebrafish CRISPR knockout, scRNA-seq, Notch inhibitor rescue epistasis\",\n      \"pmids\": [\"40074973\", \"41601327\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether CRIP2–NF-κB interaction in hemogenic endothelium uses the same mechanism as in cancer cells is unknown\", \"Mammalian hematopoietic phenotype of CRIP2 loss not examined\", \"KRT8/VIM interactions not validated by reciprocal pull-down\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key open questions include: the structural basis of CRIP2's simultaneous engagement of actin and transcriptional partners, the identity of the E3 ligase mediating copper-dependent degradation, whether actin-bundling and transcriptional functions are spatially or temporally segregated in vivo, and the mechanism by which CRIP2 modulates Notch signaling in mammalian hematopoiesis.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No co-structure of CRIP2 with any binding partner exists\", \"E3 ligase for copper-triggered degradation unidentified\", \"Separation-of-function mutations distinguishing cytoskeletal and nuclear roles not generated\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [2, 9, 17]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1, 3, 8, 11]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1, 6, 11, 12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [7, 13, 15]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [2, 9, 15, 17]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2, 15]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 1, 3, 8, 11]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 14, 17, 18]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 16, 18]}\n    ],\n    \"complexes\": [\n      \"MRTF/SRF/CArG-box complex\",\n      \"SRF-CRP2-GATA complex\",\n      \"CRP2-Brg1/SWI-SNF complex\"\n    ],\n    \"partners\": [\n      \"SRF\",\n      \"MRTFA\",\n      \"MRTFB\",\n      \"RELA\",\n      \"HOXA9\",\n      \"ATOX1\",\n      \"BRG1\",\n      \"CRP2BP\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}