{"gene":"RAB11FIP1","run_date":"2026-04-28T19:45:45","timeline":{"discoveries":[{"year":2002,"finding":"RAB11FIP1/RCP is a dual Rab4 and Rab11 effector protein; overexpression of its C-terminal Rab-binding region causes dramatic tubulation of the transferrin compartment and significantly reduces endosomal recycling without affecting ligand uptake or degradation, identifying it as a regulator of the receptor recycling pathway.","method":"Co-immunoprecipitation, overexpression dominant-negative mutant, quantitative recycling assays, subcellular colocalization with early endosomal markers","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal binding assays, functional recycling assays, and localization in a single foundational study; 141 citations","pmids":["11786538"],"is_preprint":false},{"year":2004,"finding":"The RCP-Rab11 complex regulates sorting of transferrin receptors from the degradative to the recycling pathway in tubular endosomes; RCP interacts only weakly with Rab4 in vitro and Rab11, not Rab4, is the primary functional partner for RCP in vivo.","method":"In vitro binding assays, in vivo functional transport assays, colocalization, dominant-negative expression","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro binding with mutagenesis-supported conclusions plus functional recycling assay; independently confirms and refines PMID 11786538","pmids":["15181150"],"is_preprint":false},{"year":2004,"finding":"Site-directed mutagenesis of the conserved Rab-binding domain (RBD) of RCP demonstrated that Rab11 (not Rab4) mediates the intracellular localization of RCP, and that class I Rab11-FIPs compete for binding to Rab11.","method":"Site-directed mutagenesis, binding assays, subcellular localization","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis with functional localization readout","pmids":["15280022"],"is_preprint":false},{"year":2002,"finding":"RAB11FIP1/RCP family members display extensive homo- and hetero-interactions mediated primarily by their C-terminal Rab-binding domain/ERM motif, suggesting protein 'platforms' regulated by Rab11 and/or Rab4 activity; two members (pp75/Rip11 and Rab11-FIP3) do not bind Rab4.","method":"Co-immunoprecipitation, yeast two-hybrid, binding assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 — Co-IP and pulldown, single lab but multiple binding partners tested","pmids":["11944901"],"is_preprint":false},{"year":2010,"finding":"FIP1/RCP (RAB11FIP1) and Rab11a/b are required for retrograde transport of TGN38 and Shiga toxin from early/recycling endosomes to the trans-Golgi network; proteomic analysis identified Golgin-97 as a FIP1/RCP-binding protein, with the binding domain mapping to the C-terminus of Golgin-97, and this interaction regulates tethering/fusion of retrograde transport vesicles to the TGN.","method":"Fluorescence and electron microscopy, functional transport assays, proteomic/MS analysis, co-immunoprecipitation domain mapping","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods including MS identification, functional assays, domain mapping, and morphological analysis","pmids":["20610657"],"is_preprint":false},{"year":2012,"finding":"Diacylglycerol kinase α (DGK-α) generates phosphatidic acid (PA) that is required for RCP to be mobilized to and tethered at the tips of invasive pseudopods; an RCP mutant lacking the PA-binding C2 domain cannot be tethered at pseudopod tips and fails to drive α5β1 recycling and tumor cell invasion.","method":"Dominant-negative and constitutively active DGK-α expression, RCP C2-domain deletion mutant, 3D invasion assays, subcellular localization imaging","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — multiple mutants, functional rescue experiments, and domain-deletion analysis in a single rigorous study","pmids":["22270919"],"is_preprint":false},{"year":2013,"finding":"RCP-driven α5β1 integrin recycling activates PKB/Akt, which phosphorylates RacGAP1; phospho-RacGAP1 is recruited to IQGAP1 at invasive pseudopod tips, locally suppressing Rac and promoting RhoA activity, thereby driving pseudopod extension and invasive migration into fibronectin-containing ECM.","method":"Phosphoproteomic identification of PKB/Akt substrates, Co-IP, knockdown/rescue, live-cell imaging, 3D invasion assays","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — discovery of novel phosphorylation substrate with multiple orthogonal methods and functional rescue; 115 citations","pmids":["24019536"],"is_preprint":false},{"year":2009,"finding":"RCP/RAB11FIP1 overexpression in MCF10A cells confers tumorigenic properties and enhances ERK phosphorylation and Ras activation; RCP knockdown in breast cancer cell lines inhibits invasion, migration, and tumor formation in xenograft models.","method":"Stable overexpression and knockdown, in vitro colony/invasion/migration assays, mouse xenograft, ERK/Ras activity assays","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — gain- and loss-of-function with in vivo validation and biochemical signaling readouts; 110 citations","pmids":["19620787"],"is_preprint":false},{"year":2015,"finding":"Crystal structure of Rab14 in complex with the RCP Rab-binding domain reveals that Rab14 binds RCP with reduced affinity relative to Rab11/25, with a noncanonical 1:2 stoichiometry; in vivo, Rab11 recruits RCP onto biological membranes, and both RCP and Rab14 function in neuritogenesis.","method":"X-ray crystallography, isothermal titration calorimetry, yeast two-hybrid, cell-based neuritogenesis assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with thermodynamic and cellular functional validation","pmids":["26032412"],"is_preprint":false},{"year":2017,"finding":"MARK2 kinase phosphorylates Rab11-FIP1B/C at serine 234; overexpression of a non-phosphorylatable Rab11-FIP1C(S234A) mutant in MDCK cells causes lateral lumen formation and reorientation of centrosome and Golgi, revealing a role for FIP1 phosphorylation in regulating epithelial polarity downstream of MARK2.","method":"In vitro kinase assay, phospho-specific antibodies, mutant overexpression, immunofluorescence microscopy, calcium-switch polarity assay","journal":"Cellular logistics","confidence":"High","confidence_rationale":"Tier 1-2 — kinase assay identifying specific phosphorylation site with mutagenesis and functional polarity phenotype","pmids":["28396819"],"is_preprint":false},{"year":2016,"finding":"RCP stabilizes β1 integrin protein levels, leading to activation of an ILK/EGFR/Ras/NF-κB signaling cascade and subsequent Slug induction, epithelial-to-mesenchymal transition, and increased cancer cell invasion; β1 integrin silencing blocks RCP-induced Slug expression.","method":"Ectopic expression, siRNA knockdown, pharmacological inhibitors, dominant-negative Ras, in vivo lung metastasis assay","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis with multiple pathway inhibitors, in vivo validation, and functional rescue","pmids":["27524413"],"is_preprint":false},{"year":2021,"finding":"RAB11FIP1 directly inhibits Zeb1 expression to suppress EMT; genetic knockdown of Rab11-FIP1 decreases E-cadherin, increases mesenchymal markers, increases Zeb1, and promotes invasion in 3D organoid models and human ESCC cell lines.","method":"RNA-seq, 3D organoid modeling, siRNA knockdown, invasion assays, marker immunostaining","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 — loss-of-function with multiple orthogonal phenotypic and molecular readouts","pmids":["33403789"],"is_preprint":false},{"year":2020,"finding":"Mutant p53 enhances Hsp90α vesicular trafficking and exosome-mediated secretion through RCP; RCP knockdown decreases extracellular Hsp90α levels and inhibits invasion, and recombinant Hsp90α rescues impaired migration caused by RCP depletion.","method":"Mass spectrometry identification, knockdown/rescue, vesicle trafficking assays, migration/invasion assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — MS identification of RCP in mutant p53 pathway with functional rescue experiments","pmids":["32640214"],"is_preprint":false},{"year":2021,"finding":"RCP interacts with P-glycoprotein (P-gp); in mutant p53 cells, RCP mediates delivery of P-gp to the plasma membrane upon drug treatment, decreasing intracellular drug retention and conferring chemoresistance; loss of RCP or mutant p53 sensitizes cells to cisplatin and etoposide.","method":"Protein screen (interactome), endogenous Co-IP, knockdown, plasma membrane fractionation, drug retention assays","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 2 — endogenous Co-IP with functional drug resistance assays and mechanistic fractionation data","pmids":["33627632"],"is_preprint":false},{"year":2021,"finding":"Rab11-FIP1 and Rab11-FIP5 cooperatively facilitate polymeric IgA (pIgA) transcytosis; TRIM21 mediates K11-linked polyubiquitination of Rab11-FIP1 and K6-linked polyubiquitination of Rab11-FIP5 to promote their activation and pIgA transcytosis in epithelial cells.","method":"Co-IP, knockdown, ubiquitination assays, transcytosis functional assays in polarized/incompletely polarized cells","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 — ubiquitination assays with functional transcytosis readout; single lab study","pmids":["34638806"],"is_preprint":false},{"year":2022,"finding":"Global Rab11FIP1 knockout mice develop spontaneous colonic inflammation, show decreased TFF3-positive goblet cells, abnormal accumulation of subapical vesicles in colonocytes, and internalization of transmembrane mucin MUC13 with Rab14; after DSS treatment, KO mice exhibit greater mucosal damage, revealing RCP's role in colonic mucosal cytoprotection.","method":"Global knockout mouse model, immunostaining, RNA-seq, DSS colitis model, subcellular vesicle analysis","journal":"American journal of physiology. Gastrointestinal and liver physiology","confidence":"High","confidence_rationale":"Tier 2 — in vivo KO model with multiple orthogonal cellular and molecular phenotypic readouts","pmids":["35819177"],"is_preprint":false},{"year":2020,"finding":"Thrombin-induced PAR1 internalization and lysosomal targeting requires disassembly of the Rab11a/RCP complex, which depends on thrombin-induced intracellular calcium increase and calpain activation.","method":"Fluorescence imaging, calpain inhibition, calcium chelation, Co-IP, internalization assays","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2-3 — mechanistic dissection of complex disassembly with pharmacological inhibitors; single lab","pmids":["32860953"],"is_preprint":false},{"year":2006,"finding":"The RAB11FIP1 gene encodes eight alternatively spliced transcripts; isoforms containing the C-terminal Rab11-binding domain (A-D) target to Rab11a-containing membranes, while isoforms lacking this domain (E/F/H) do not. Endogenous Rab11-FIP1C/RCP resides in a differentiable subcellular compartment within the recycling system compared to FIP1A and FIP1B.","method":"Molecular cloning, EGFP-fusion overexpression, immunofluorescence colocalization, antibody staining of endogenous protein","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 3 — localization and isoform characterization; single lab","pmids":["16920206"],"is_preprint":false},{"year":2018,"finding":"RCP-induced cancer cell invasion requires FAK phosphorylation; RCP expression induces FAK activation which links β1 integrin with EGFR in a positive regulatory loop; curcumin inhibits RCP-induced invasion by blocking β1 integrin stabilization and consequently inhibiting FAK and EGFR activation.","method":"Ectopic expression, pharmacological inhibition, Western blotting, invasion assays","journal":"Experimental & molecular medicine","confidence":"Medium","confidence_rationale":"Tier 3 — single lab, pharmacological inhibitors with invasion phenotype; pathway epistasis established","pmids":["29700289"],"is_preprint":false},{"year":2022,"finding":"Mutant p53 (DNA-contact mutants) enhances RCP transcription through gain-of-function binding to Sp1/Sp3 transcription factors, whereas wild-type p53 suppresses RCP transcription by decreasing Sp1/3 protein levels; Sp1, Sp3, and Stat3 are transcriptional activators of RCP.","method":"Mass spectrometry, ChIP, reporter assays, knockdown/overexpression, mutant p53 expression","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — MS identification of transcription factors with ChIP/reporter validation; single lab","pmids":["35256783"],"is_preprint":false},{"year":2022,"finding":"STAT3 is phosphorylated downstream of the β1 integrin/EGFR axis in RCP-expressing cancer cells and drives invasion through the NF-κB/Slug/MT1-MMP signaling cascade; pharmacological or genetic inhibition of STAT3 blocks RCP-induced invasion.","method":"siRNA knockdown, pharmacological inhibition, Western blotting, invasion assays, immunohistochemistry","journal":"Archives of pharmacal research","confidence":"Medium","confidence_rationale":"Tier 2-3 — epistasis established by multiple inhibitor approaches; single lab","pmids":["35809175"],"is_preprint":false},{"year":2025,"finding":"RCP brings RAB14 and MET together onto endosomal subdomains to facilitate RAB14-dependent tubulovesicular recycling of the MET receptor to invadopodia; KIF16B, a molecular motor recruited via RAB14, promotes endosomal tubulation required for MET recycling.","method":"Co-IP, proximity ligation assay, knockdown, live-cell imaging, invasion assays","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 — preprint, single lab, Co-IP based; not yet peer reviewed","pmids":["bio_10.1101_2025.09.23.677683"],"is_preprint":true},{"year":2024,"finding":"KIF3AC kinesin and RCP are required for focal adhesion reformation after disassembly in fibroblasts; KIF3C associates with β1 integrin in an RCP-dependent manner after FA disassembly, and KIF3AC knockdown inhibits trafficking of RCP toward the leading edge and polarized FA formation.","method":"Biochemical pulldown, knockdown, live-cell imaging, FA reformation assays","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 — preprint, single lab; pulldown and imaging data without peer review","pmids":["bio_10.1101_2024.12.09.627580"],"is_preprint":true}],"current_model":"RAB11FIP1/RCP is a Rab11 (and weakly Rab4) effector that localizes to tubular recycling endosomes where it regulates sorting and recycling of transmembrane cargo (transferrin receptor, α5β1 integrin, P-glycoprotein, PAR1, MUC13, pIgR) back to the plasma membrane or trans-Golgi network via interaction with Golgin-97; at the tips of invasive pseudopods it is tethered by phosphatidic acid generated by DGK-α, drives PKB/Akt-mediated phosphorylation of RacGAP1, and coordinates a Rac-to-RhoA switch to promote actin reorganization and tumor cell invasion, while its transcription is upregulated by mutant p53 through Sp1/Sp3 and it is phosphorylated by MARK2 at S234 to regulate epithelial polarity."},"narrative":{"teleology":[{"year":2002,"claim":"Identifying RCP as a dual Rab4/Rab11 effector that controls endosomal recycling established the gene's foundational molecular function and linked it to the transferrin recycling pathway.","evidence":"Co-IP, dominant-negative overexpression, and quantitative recycling assays in cultured cells","pmids":["11786538","11944901"],"confidence":"High","gaps":["Relative functional contributions of Rab4 versus Rab11 binding were unclear","Physiological cargo beyond transferrin receptor unknown","No structural data on Rab–RCP interaction"]},{"year":2004,"claim":"Demonstrating that Rab11—not Rab4—is the primary functional partner resolved the ambiguity of the dual effector model and showed that RCP sorts cargo from degradative to recycling routes.","evidence":"In vitro binding assays, site-directed mutagenesis of the RBD, and in vivo transport assays","pmids":["15181150","15280022"],"confidence":"High","gaps":["Other Rab partners (e.g., Rab14, Rab25) not yet tested","Mechanism of sorting decision at the endosome unresolved"]},{"year":2006,"claim":"Characterizing eight RAB11FIP1 splice isoforms and showing that only isoforms retaining the C-terminal RBD localize to Rab11-positive membranes revealed isoform-specific functional specialization within the recycling system.","evidence":"Molecular cloning, EGFP-fusion imaging, and endogenous antibody staining","pmids":["16920206"],"confidence":"Medium","gaps":["Functional differences among RBD-containing isoforms (A–D) were not established","Tissue-specific isoform expression not characterized"]},{"year":2009,"claim":"Showing that RCP overexpression confers tumorigenicity and RCP knockdown blocks invasion and xenograft growth established RCP as an oncogenic driver acting through ERK/Ras activation.","evidence":"Stable overexpression/knockdown in breast cancer lines, in vitro colony and invasion assays, mouse xenograft","pmids":["19620787"],"confidence":"High","gaps":["Upstream regulators of RCP expression in cancer unknown","Which recycling cargo mediates oncogenic signaling not defined"]},{"year":2010,"claim":"Discovery that RCP and Rab11 mediate retrograde transport to the TGN via interaction with Golgin-97 expanded RCP's trafficking role beyond plasma membrane recycling to include endosome-to-TGN routing.","evidence":"Proteomic identification of Golgin-97 as RCP partner, domain mapping, functional transport assays with TGN38 and Shiga toxin","pmids":["20610657"],"confidence":"High","gaps":["How RCP distinguishes retrograde versus recycling cargo unclear","Whether Golgin-97 interaction is regulated by post-translational modification unknown"]},{"year":2012,"claim":"Demonstrating that DGKα-generated phosphatidic acid tethers RCP at pseudopod tips via its C2 domain linked lipid signaling to integrin recycling and invasive migration.","evidence":"DGKα mutants, RCP C2-domain deletion, 3D invasion assays, and subcellular localization","pmids":["22270919"],"confidence":"High","gaps":["Structural basis of C2 domain–PA interaction not resolved","Whether other lipid species regulate RCP tethering untested"]},{"year":2013,"claim":"Identification of the Akt→RacGAP1 phosphorylation cascade downstream of RCP-driven α5β1 recycling revealed the molecular mechanism by which RCP coordinates a Rac-to-RhoA switch at pseudopod tips to drive invasion.","evidence":"Phosphoproteomics, Co-IP, knockdown/rescue, live-cell imaging, 3D invasion assays","pmids":["24019536"],"confidence":"High","gaps":["Whether RCP directly scaffolds Akt or acts indirectly through integrin clustering not distinguished","Contribution of this pathway to in vivo metastasis not tested"]},{"year":2015,"claim":"Crystal structure of Rab14–RCP RBD complex revealed a noncanonical 1:2 stoichiometry and lower affinity versus Rab11, and both RCP and Rab14 were shown to function in neuritogenesis, broadening the Rab partner repertoire.","evidence":"X-ray crystallography, ITC, yeast two-hybrid, neuritogenesis assay","pmids":["26032412"],"confidence":"High","gaps":["Functional significance of the 1:2 stoichiometry in vivo unclear","Whether Rab14 and Rab11 compete for RCP on the same membrane not resolved"]},{"year":2016,"claim":"Showing that RCP stabilizes β1 integrin to engage an ILK/EGFR/NF-κB/Slug cascade defined a mechanistic link between RCP-mediated recycling and epithelial-to-mesenchymal transition.","evidence":"Ectopic expression, siRNA epistasis with pathway inhibitors, in vivo lung metastasis model","pmids":["27524413"],"confidence":"High","gaps":["Mechanism by which RCP stabilizes β1 integrin protein levels not identified","Whether this pathway operates in non-breast cancer contexts untested"]},{"year":2017,"claim":"Identifying MARK2 phosphorylation of RCP at S234 and its requirement for correct lumen positioning linked RCP to epithelial polarity regulation beyond trafficking.","evidence":"In vitro kinase assay, phospho-mutant overexpression, calcium-switch polarity assay in MDCK cells","pmids":["28396819"],"confidence":"High","gaps":["How S234 phosphorylation alters RCP conformation or partner binding unknown","Relevance to in vivo epithelial morphogenesis not tested"]},{"year":2020,"claim":"Demonstrating that mutant p53 co-opts RCP to drive Hsp90α exosomal secretion and P-glycoprotein surface delivery connected RCP trafficking to chemoresistance mechanisms.","evidence":"MS identification, knockdown/rescue, vesicle trafficking and drug retention assays","pmids":["32640214","33627632"],"confidence":"High","gaps":["Whether RCP directly recognizes P-gp or uses an adaptor unknown","Contribution of exosomal Hsp90α to in vivo tumor microenvironment remodeling not established"]},{"year":2021,"claim":"Dual findings that RCP suppresses EMT by inhibiting Zeb1 and facilitates pIgA transcytosis via TRIM21-mediated ubiquitination expanded RCP's roles into epithelial barrier integrity and mucosal immunity.","evidence":"RNA-seq, 3D organoids, siRNA, invasion assays (EMT); Co-IP, ubiquitination assays, transcytosis assays (pIgA)","pmids":["33403789","34638806"],"confidence":"High","gaps":["Whether RCP's anti-EMT function is independent of its recycling activity not resolved","Whether K11 ubiquitination activates RCP or targets it for degradation in specific contexts unclear"]},{"year":2022,"claim":"Revealing that mutant p53 transcriptionally upregulates RCP via Sp1/Sp3 and that downstream STAT3 activation drives invasion closed the loop on how RCP expression is elevated in cancer and which signaling cascades mediate its pro-invasive effects.","evidence":"ChIP, reporter assays, MS-based TF identification, epistasis with STAT3 inhibition","pmids":["35256783","35819177","35809175"],"confidence":"Medium","gaps":["Whether Sp1/Sp3-dependent transcription operates in non-cancer tissues unknown","Global knockout mouse phenotype focused on colon; other organ phenotypes not characterized"]},{"year":null,"claim":"Key unresolved questions include the structural basis for how RCP selects among diverse cargo, whether the anti-EMT and pro-invasion roles are context-dependent or represent distinct isoform functions, and the in vivo contribution of MARK2 phosphorylation to tissue morphogenesis.","evidence":"","pmids":[],"confidence":"Low","gaps":["No full-length RCP structure available","Cargo selection mechanism not defined at molecular level","Isoform-specific functions in vivo not resolved","Relationship between S234 phosphorylation and oncogenic signaling untested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1,4,5,6]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[5]}],"localization":[{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[0,1,4,15]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[0,4,5]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[5,6,13]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[0,1,4,5,13,14,15]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[6,7,10,20]},{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[9,10]},{"term_id":"R-HSA-1474244","term_label":"Extracellular matrix organization","supporting_discovery_ids":[5,6,10]}],"complexes":[],"partners":["RAB11A","RAB14","GOLGA4","DGKA","RACGAP1","ITGB1","TRIM21","MARK2"],"other_free_text":[]},"mechanistic_narrative":"RAB11FIP1 (RCP) is a Rab11 effector that functions as a master regulator of membrane cargo recycling at tubular recycling endosomes, directing diverse transmembrane proteins—including transferrin receptor, integrins, PAR1, P-glycoprotein, MUC13, and polymeric immunoglobulin receptor—back to the plasma membrane or, via interaction with Golgin-97, to the trans-Golgi network [PMID:11786538, PMID:15181150, PMID:20610657, PMID:35819177]. Its C2 domain binds phosphatidic acid generated by DGKα, tethering RCP-positive vesicles at invasive pseudopod tips where α5β1 integrin recycling activates an Akt→RacGAP1 signaling cascade that switches Rac-to-RhoA activity and promotes tumor cell invasion [PMID:22270919, PMID:24019536]. RCP stabilizes β1 integrin protein levels, engaging ILK/EGFR/Ras/NF-κB and STAT3/Slug pathways to drive epithelial-to-mesenchymal transition and metastasis, while its transcription is upregulated by gain-of-function mutant p53 through Sp1/Sp3 [PMID:27524413, PMID:35256783]. Global knockout in mice causes spontaneous colonic inflammation with defective apical membrane trafficking and goblet cell loss, establishing an in vivo requirement for mucosal homeostasis [PMID:35819177]."},"prefetch_data":{"uniprot":{"accession":"Q6WKZ4","full_name":"Rab11 family-interacting protein 1","aliases":["Rab-coupling protein"],"length_aa":1283,"mass_kda":137.2,"function":"A Rab11 effector protein involved in the endosomal recycling process. Also involved in controlling membrane trafficking along the phagocytic pathway and in phagocytosis. 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dominant-negative mutant, quantitative recycling assays, subcellular colocalization with early endosomal markers\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal binding assays, functional recycling assays, and localization in a single foundational study; 141 citations\",\n      \"pmids\": [\"11786538\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The RCP-Rab11 complex regulates sorting of transferrin receptors from the degradative to the recycling pathway in tubular endosomes; RCP interacts only weakly with Rab4 in vitro and Rab11, not Rab4, is the primary functional partner for RCP in vivo.\",\n      \"method\": \"In vitro binding assays, in vivo functional transport assays, colocalization, dominant-negative expression\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro binding with mutagenesis-supported conclusions plus functional recycling assay; independently confirms and refines PMID 11786538\",\n      \"pmids\": [\"15181150\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Site-directed mutagenesis of the conserved Rab-binding domain (RBD) of RCP demonstrated that Rab11 (not Rab4) mediates the intracellular localization of RCP, and that class I Rab11-FIPs compete for binding to Rab11.\",\n      \"method\": \"Site-directed mutagenesis, binding assays, subcellular localization\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis with functional localization readout\",\n      \"pmids\": [\"15280022\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"RAB11FIP1/RCP family members display extensive homo- and hetero-interactions mediated primarily by their C-terminal Rab-binding domain/ERM motif, suggesting protein 'platforms' regulated by Rab11 and/or Rab4 activity; two members (pp75/Rip11 and Rab11-FIP3) do not bind Rab4.\",\n      \"method\": \"Co-immunoprecipitation, yeast two-hybrid, binding assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — Co-IP and pulldown, single lab but multiple binding partners tested\",\n      \"pmids\": [\"11944901\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"FIP1/RCP (RAB11FIP1) and Rab11a/b are required for retrograde transport of TGN38 and Shiga toxin from early/recycling endosomes to the trans-Golgi network; proteomic analysis identified Golgin-97 as a FIP1/RCP-binding protein, with the binding domain mapping to the C-terminus of Golgin-97, and this interaction regulates tethering/fusion of retrograde transport vesicles to the TGN.\",\n      \"method\": \"Fluorescence and electron microscopy, functional transport assays, proteomic/MS analysis, co-immunoprecipitation domain mapping\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods including MS identification, functional assays, domain mapping, and morphological analysis\",\n      \"pmids\": [\"20610657\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Diacylglycerol kinase α (DGK-α) generates phosphatidic acid (PA) that is required for RCP to be mobilized to and tethered at the tips of invasive pseudopods; an RCP mutant lacking the PA-binding C2 domain cannot be tethered at pseudopod tips and fails to drive α5β1 recycling and tumor cell invasion.\",\n      \"method\": \"Dominant-negative and constitutively active DGK-α expression, RCP C2-domain deletion mutant, 3D invasion assays, subcellular localization imaging\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple mutants, functional rescue experiments, and domain-deletion analysis in a single rigorous study\",\n      \"pmids\": [\"22270919\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"RCP-driven α5β1 integrin recycling activates PKB/Akt, which phosphorylates RacGAP1; phospho-RacGAP1 is recruited to IQGAP1 at invasive pseudopod tips, locally suppressing Rac and promoting RhoA activity, thereby driving pseudopod extension and invasive migration into fibronectin-containing ECM.\",\n      \"method\": \"Phosphoproteomic identification of PKB/Akt substrates, Co-IP, knockdown/rescue, live-cell imaging, 3D invasion assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — discovery of novel phosphorylation substrate with multiple orthogonal methods and functional rescue; 115 citations\",\n      \"pmids\": [\"24019536\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"RCP/RAB11FIP1 overexpression in MCF10A cells confers tumorigenic properties and enhances ERK phosphorylation and Ras activation; RCP knockdown in breast cancer cell lines inhibits invasion, migration, and tumor formation in xenograft models.\",\n      \"method\": \"Stable overexpression and knockdown, in vitro colony/invasion/migration assays, mouse xenograft, ERK/Ras activity assays\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — gain- and loss-of-function with in vivo validation and biochemical signaling readouts; 110 citations\",\n      \"pmids\": [\"19620787\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Crystal structure of Rab14 in complex with the RCP Rab-binding domain reveals that Rab14 binds RCP with reduced affinity relative to Rab11/25, with a noncanonical 1:2 stoichiometry; in vivo, Rab11 recruits RCP onto biological membranes, and both RCP and Rab14 function in neuritogenesis.\",\n      \"method\": \"X-ray crystallography, isothermal titration calorimetry, yeast two-hybrid, cell-based neuritogenesis assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with thermodynamic and cellular functional validation\",\n      \"pmids\": [\"26032412\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MARK2 kinase phosphorylates Rab11-FIP1B/C at serine 234; overexpression of a non-phosphorylatable Rab11-FIP1C(S234A) mutant in MDCK cells causes lateral lumen formation and reorientation of centrosome and Golgi, revealing a role for FIP1 phosphorylation in regulating epithelial polarity downstream of MARK2.\",\n      \"method\": \"In vitro kinase assay, phospho-specific antibodies, mutant overexpression, immunofluorescence microscopy, calcium-switch polarity assay\",\n      \"journal\": \"Cellular logistics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — kinase assay identifying specific phosphorylation site with mutagenesis and functional polarity phenotype\",\n      \"pmids\": [\"28396819\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"RCP stabilizes β1 integrin protein levels, leading to activation of an ILK/EGFR/Ras/NF-κB signaling cascade and subsequent Slug induction, epithelial-to-mesenchymal transition, and increased cancer cell invasion; β1 integrin silencing blocks RCP-induced Slug expression.\",\n      \"method\": \"Ectopic expression, siRNA knockdown, pharmacological inhibitors, dominant-negative Ras, in vivo lung metastasis assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with multiple pathway inhibitors, in vivo validation, and functional rescue\",\n      \"pmids\": [\"27524413\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RAB11FIP1 directly inhibits Zeb1 expression to suppress EMT; genetic knockdown of Rab11-FIP1 decreases E-cadherin, increases mesenchymal markers, increases Zeb1, and promotes invasion in 3D organoid models and human ESCC cell lines.\",\n      \"method\": \"RNA-seq, 3D organoid modeling, siRNA knockdown, invasion assays, marker immunostaining\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function with multiple orthogonal phenotypic and molecular readouts\",\n      \"pmids\": [\"33403789\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Mutant p53 enhances Hsp90α vesicular trafficking and exosome-mediated secretion through RCP; RCP knockdown decreases extracellular Hsp90α levels and inhibits invasion, and recombinant Hsp90α rescues impaired migration caused by RCP depletion.\",\n      \"method\": \"Mass spectrometry identification, knockdown/rescue, vesicle trafficking assays, migration/invasion assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — MS identification of RCP in mutant p53 pathway with functional rescue experiments\",\n      \"pmids\": [\"32640214\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RCP interacts with P-glycoprotein (P-gp); in mutant p53 cells, RCP mediates delivery of P-gp to the plasma membrane upon drug treatment, decreasing intracellular drug retention and conferring chemoresistance; loss of RCP or mutant p53 sensitizes cells to cisplatin and etoposide.\",\n      \"method\": \"Protein screen (interactome), endogenous Co-IP, knockdown, plasma membrane fractionation, drug retention assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — endogenous Co-IP with functional drug resistance assays and mechanistic fractionation data\",\n      \"pmids\": [\"33627632\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Rab11-FIP1 and Rab11-FIP5 cooperatively facilitate polymeric IgA (pIgA) transcytosis; TRIM21 mediates K11-linked polyubiquitination of Rab11-FIP1 and K6-linked polyubiquitination of Rab11-FIP5 to promote their activation and pIgA transcytosis in epithelial cells.\",\n      \"method\": \"Co-IP, knockdown, ubiquitination assays, transcytosis functional assays in polarized/incompletely polarized cells\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ubiquitination assays with functional transcytosis readout; single lab study\",\n      \"pmids\": [\"34638806\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Global Rab11FIP1 knockout mice develop spontaneous colonic inflammation, show decreased TFF3-positive goblet cells, abnormal accumulation of subapical vesicles in colonocytes, and internalization of transmembrane mucin MUC13 with Rab14; after DSS treatment, KO mice exhibit greater mucosal damage, revealing RCP's role in colonic mucosal cytoprotection.\",\n      \"method\": \"Global knockout mouse model, immunostaining, RNA-seq, DSS colitis model, subcellular vesicle analysis\",\n      \"journal\": \"American journal of physiology. Gastrointestinal and liver physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo KO model with multiple orthogonal cellular and molecular phenotypic readouts\",\n      \"pmids\": [\"35819177\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Thrombin-induced PAR1 internalization and lysosomal targeting requires disassembly of the Rab11a/RCP complex, which depends on thrombin-induced intracellular calcium increase and calpain activation.\",\n      \"method\": \"Fluorescence imaging, calpain inhibition, calcium chelation, Co-IP, internalization assays\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — mechanistic dissection of complex disassembly with pharmacological inhibitors; single lab\",\n      \"pmids\": [\"32860953\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The RAB11FIP1 gene encodes eight alternatively spliced transcripts; isoforms containing the C-terminal Rab11-binding domain (A-D) target to Rab11a-containing membranes, while isoforms lacking this domain (E/F/H) do not. Endogenous Rab11-FIP1C/RCP resides in a differentiable subcellular compartment within the recycling system compared to FIP1A and FIP1B.\",\n      \"method\": \"Molecular cloning, EGFP-fusion overexpression, immunofluorescence colocalization, antibody staining of endogenous protein\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — localization and isoform characterization; single lab\",\n      \"pmids\": [\"16920206\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"RCP-induced cancer cell invasion requires FAK phosphorylation; RCP expression induces FAK activation which links β1 integrin with EGFR in a positive regulatory loop; curcumin inhibits RCP-induced invasion by blocking β1 integrin stabilization and consequently inhibiting FAK and EGFR activation.\",\n      \"method\": \"Ectopic expression, pharmacological inhibition, Western blotting, invasion assays\",\n      \"journal\": \"Experimental & molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab, pharmacological inhibitors with invasion phenotype; pathway epistasis established\",\n      \"pmids\": [\"29700289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Mutant p53 (DNA-contact mutants) enhances RCP transcription through gain-of-function binding to Sp1/Sp3 transcription factors, whereas wild-type p53 suppresses RCP transcription by decreasing Sp1/3 protein levels; Sp1, Sp3, and Stat3 are transcriptional activators of RCP.\",\n      \"method\": \"Mass spectrometry, ChIP, reporter assays, knockdown/overexpression, mutant p53 expression\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — MS identification of transcription factors with ChIP/reporter validation; single lab\",\n      \"pmids\": [\"35256783\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"STAT3 is phosphorylated downstream of the β1 integrin/EGFR axis in RCP-expressing cancer cells and drives invasion through the NF-κB/Slug/MT1-MMP signaling cascade; pharmacological or genetic inhibition of STAT3 blocks RCP-induced invasion.\",\n      \"method\": \"siRNA knockdown, pharmacological inhibition, Western blotting, invasion assays, immunohistochemistry\",\n      \"journal\": \"Archives of pharmacal research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — epistasis established by multiple inhibitor approaches; single lab\",\n      \"pmids\": [\"35809175\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"RCP brings RAB14 and MET together onto endosomal subdomains to facilitate RAB14-dependent tubulovesicular recycling of the MET receptor to invadopodia; KIF16B, a molecular motor recruited via RAB14, promotes endosomal tubulation required for MET recycling.\",\n      \"method\": \"Co-IP, proximity ligation assay, knockdown, live-cell imaging, invasion assays\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — preprint, single lab, Co-IP based; not yet peer reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.09.23.677683\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"KIF3AC kinesin and RCP are required for focal adhesion reformation after disassembly in fibroblasts; KIF3C associates with β1 integrin in an RCP-dependent manner after FA disassembly, and KIF3AC knockdown inhibits trafficking of RCP toward the leading edge and polarized FA formation.\",\n      \"method\": \"Biochemical pulldown, knockdown, live-cell imaging, FA reformation assays\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — preprint, single lab; pulldown and imaging data without peer review\",\n      \"pmids\": [\"bio_10.1101_2024.12.09.627580\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"RAB11FIP1/RCP is a Rab11 (and weakly Rab4) effector that localizes to tubular recycling endosomes where it regulates sorting and recycling of transmembrane cargo (transferrin receptor, α5β1 integrin, P-glycoprotein, PAR1, MUC13, pIgR) back to the plasma membrane or trans-Golgi network via interaction with Golgin-97; at the tips of invasive pseudopods it is tethered by phosphatidic acid generated by DGK-α, drives PKB/Akt-mediated phosphorylation of RacGAP1, and coordinates a Rac-to-RhoA switch to promote actin reorganization and tumor cell invasion, while its transcription is upregulated by mutant p53 through Sp1/Sp3 and it is phosphorylated by MARK2 at S234 to regulate epithelial polarity.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"RAB11FIP1 (RCP) is a Rab11 effector that functions as a master regulator of membrane cargo recycling at tubular recycling endosomes, directing diverse transmembrane proteins—including transferrin receptor, integrins, PAR1, P-glycoprotein, MUC13, and polymeric immunoglobulin receptor—back to the plasma membrane or, via interaction with Golgin-97, to the trans-Golgi network [PMID:11786538, PMID:15181150, PMID:20610657, PMID:35819177]. Its C2 domain binds phosphatidic acid generated by DGKα, tethering RCP-positive vesicles at invasive pseudopod tips where α5β1 integrin recycling activates an Akt→RacGAP1 signaling cascade that switches Rac-to-RhoA activity and promotes tumor cell invasion [PMID:22270919, PMID:24019536]. RCP stabilizes β1 integrin protein levels, engaging ILK/EGFR/Ras/NF-κB and STAT3/Slug pathways to drive epithelial-to-mesenchymal transition and metastasis, while its transcription is upregulated by gain-of-function mutant p53 through Sp1/Sp3 [PMID:27524413, PMID:35256783]. Global knockout in mice causes spontaneous colonic inflammation with defective apical membrane trafficking and goblet cell loss, establishing an in vivo requirement for mucosal homeostasis [PMID:35819177].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Identifying RCP as a dual Rab4/Rab11 effector that controls endosomal recycling established the gene's foundational molecular function and linked it to the transferrin recycling pathway.\",\n      \"evidence\": \"Co-IP, dominant-negative overexpression, and quantitative recycling assays in cultured cells\",\n      \"pmids\": [\"11786538\", \"11944901\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Relative functional contributions of Rab4 versus Rab11 binding were unclear\",\n        \"Physiological cargo beyond transferrin receptor unknown\",\n        \"No structural data on Rab–RCP interaction\"\n      ]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstrating that Rab11—not Rab4—is the primary functional partner resolved the ambiguity of the dual effector model and showed that RCP sorts cargo from degradative to recycling routes.\",\n      \"evidence\": \"In vitro binding assays, site-directed mutagenesis of the RBD, and in vivo transport assays\",\n      \"pmids\": [\"15181150\", \"15280022\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Other Rab partners (e.g., Rab14, Rab25) not yet tested\",\n        \"Mechanism of sorting decision at the endosome unresolved\"\n      ]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Characterizing eight RAB11FIP1 splice isoforms and showing that only isoforms retaining the C-terminal RBD localize to Rab11-positive membranes revealed isoform-specific functional specialization within the recycling system.\",\n      \"evidence\": \"Molecular cloning, EGFP-fusion imaging, and endogenous antibody staining\",\n      \"pmids\": [\"16920206\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Functional differences among RBD-containing isoforms (A–D) were not established\",\n        \"Tissue-specific isoform expression not characterized\"\n      ]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Showing that RCP overexpression confers tumorigenicity and RCP knockdown blocks invasion and xenograft growth established RCP as an oncogenic driver acting through ERK/Ras activation.\",\n      \"evidence\": \"Stable overexpression/knockdown in breast cancer lines, in vitro colony and invasion assays, mouse xenograft\",\n      \"pmids\": [\"19620787\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Upstream regulators of RCP expression in cancer unknown\",\n        \"Which recycling cargo mediates oncogenic signaling not defined\"\n      ]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Discovery that RCP and Rab11 mediate retrograde transport to the TGN via interaction with Golgin-97 expanded RCP's trafficking role beyond plasma membrane recycling to include endosome-to-TGN routing.\",\n      \"evidence\": \"Proteomic identification of Golgin-97 as RCP partner, domain mapping, functional transport assays with TGN38 and Shiga toxin\",\n      \"pmids\": [\"20610657\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"How RCP distinguishes retrograde versus recycling cargo unclear\",\n        \"Whether Golgin-97 interaction is regulated by post-translational modification unknown\"\n      ]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstrating that DGKα-generated phosphatidic acid tethers RCP at pseudopod tips via its C2 domain linked lipid signaling to integrin recycling and invasive migration.\",\n      \"evidence\": \"DGKα mutants, RCP C2-domain deletion, 3D invasion assays, and subcellular localization\",\n      \"pmids\": [\"22270919\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis of C2 domain–PA interaction not resolved\",\n        \"Whether other lipid species regulate RCP tethering untested\"\n      ]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identification of the Akt→RacGAP1 phosphorylation cascade downstream of RCP-driven α5β1 recycling revealed the molecular mechanism by which RCP coordinates a Rac-to-RhoA switch at pseudopod tips to drive invasion.\",\n      \"evidence\": \"Phosphoproteomics, Co-IP, knockdown/rescue, live-cell imaging, 3D invasion assays\",\n      \"pmids\": [\"24019536\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether RCP directly scaffolds Akt or acts indirectly through integrin clustering not distinguished\",\n        \"Contribution of this pathway to in vivo metastasis not tested\"\n      ]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Crystal structure of Rab14–RCP RBD complex revealed a noncanonical 1:2 stoichiometry and lower affinity versus Rab11, and both RCP and Rab14 were shown to function in neuritogenesis, broadening the Rab partner repertoire.\",\n      \"evidence\": \"X-ray crystallography, ITC, yeast two-hybrid, neuritogenesis assay\",\n      \"pmids\": [\"26032412\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Functional significance of the 1:2 stoichiometry in vivo unclear\",\n        \"Whether Rab14 and Rab11 compete for RCP on the same membrane not resolved\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Showing that RCP stabilizes β1 integrin to engage an ILK/EGFR/NF-κB/Slug cascade defined a mechanistic link between RCP-mediated recycling and epithelial-to-mesenchymal transition.\",\n      \"evidence\": \"Ectopic expression, siRNA epistasis with pathway inhibitors, in vivo lung metastasis model\",\n      \"pmids\": [\"27524413\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Mechanism by which RCP stabilizes β1 integrin protein levels not identified\",\n        \"Whether this pathway operates in non-breast cancer contexts untested\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identifying MARK2 phosphorylation of RCP at S234 and its requirement for correct lumen positioning linked RCP to epithelial polarity regulation beyond trafficking.\",\n      \"evidence\": \"In vitro kinase assay, phospho-mutant overexpression, calcium-switch polarity assay in MDCK cells\",\n      \"pmids\": [\"28396819\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"How S234 phosphorylation alters RCP conformation or partner binding unknown\",\n        \"Relevance to in vivo epithelial morphogenesis not tested\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrating that mutant p53 co-opts RCP to drive Hsp90α exosomal secretion and P-glycoprotein surface delivery connected RCP trafficking to chemoresistance mechanisms.\",\n      \"evidence\": \"MS identification, knockdown/rescue, vesicle trafficking and drug retention assays\",\n      \"pmids\": [\"32640214\", \"33627632\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether RCP directly recognizes P-gp or uses an adaptor unknown\",\n        \"Contribution of exosomal Hsp90α to in vivo tumor microenvironment remodeling not established\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Dual findings that RCP suppresses EMT by inhibiting Zeb1 and facilitates pIgA transcytosis via TRIM21-mediated ubiquitination expanded RCP's roles into epithelial barrier integrity and mucosal immunity.\",\n      \"evidence\": \"RNA-seq, 3D organoids, siRNA, invasion assays (EMT); Co-IP, ubiquitination assays, transcytosis assays (pIgA)\",\n      \"pmids\": [\"33403789\", \"34638806\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether RCP's anti-EMT function is independent of its recycling activity not resolved\",\n        \"Whether K11 ubiquitination activates RCP or targets it for degradation in specific contexts unclear\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Revealing that mutant p53 transcriptionally upregulates RCP via Sp1/Sp3 and that downstream STAT3 activation drives invasion closed the loop on how RCP expression is elevated in cancer and which signaling cascades mediate its pro-invasive effects.\",\n      \"evidence\": \"ChIP, reporter assays, MS-based TF identification, epistasis with STAT3 inhibition\",\n      \"pmids\": [\"35256783\", \"35819177\", \"35809175\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether Sp1/Sp3-dependent transcription operates in non-cancer tissues unknown\",\n        \"Global knockout mouse phenotype focused on colon; other organ phenotypes not characterized\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis for how RCP selects among diverse cargo, whether the anti-EMT and pro-invasion roles are context-dependent or represent distinct isoform functions, and the in vivo contribution of MARK2 phosphorylation to tissue morphogenesis.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No full-length RCP structure available\",\n        \"Cargo selection mechanism not defined at molecular level\",\n        \"Isoform-specific functions in vivo not resolved\",\n        \"Relationship between S234 phosphorylation and oncogenic signaling untested\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1, 4, 5, 6]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [0, 1, 4, 15]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [0, 4, 5]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [5, 6, 13]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 1, 4, 5, 13, 14, 15]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [6, 7, 10, 20]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [9, 10]},\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [5, 6, 10]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"RAB11A\",\n      \"RAB14\",\n      \"GOLGA4\",\n      \"DGKA\",\n      \"RACGAP1\",\n      \"ITGB1\",\n      \"TRIM21\",\n      \"MARK2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}