{"gene":"RAB3IP","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":1995,"finding":"Rabin3 (RAB3IP) was identified as a novel protein that interacts specifically with Rab3A and Rab3D (but not Rab3C, Rab2, Ran, or Ras) via the effector domain of Rab3A; point mutations F51L, V55E, and G56D in the effector domain of Rab3A abolish the interaction. The protein contains a region of sequence similarity to the yeast Sec2p GEF. However, in vitro the GST-Rabin3 fusion protein associates only weakly with recombinant Rab3A and possesses no detectable GTPase-activating protein or nucleotide exchange activity toward Rab3A.","method":"Yeast two-hybrid screen, GST pulldown, in vitro GTPase assays, point mutagenesis","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — yeast two-hybrid with mutagenesis validation and in vitro assays; single lab but multiple orthogonal methods","pmids":["7532276"],"is_preprint":false},{"year":2002,"finding":"RAB3IP (human Rabin3/Rabin8) physically interacts with the cancer-related protein SSX2 in vitro and in cells. GST pulldown confirmed direct interaction. Co-expression of RAB3IP and SSX2 causes relocalization of the normally cytoplasmic RAB3IP to the nucleus. The interaction maps to the N-terminal moiety of SSX2, and RAB3IP does not interact with SSX1, SSX3, or SSX4.","method":"Yeast two-hybrid, GST pulldown, immunofluorescence co-localization in transfected cells","journal":"Genes, chromosomes & cancer","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — reciprocal yeast two-hybrid and GST pulldown with localization data; single lab, multiple orthogonal methods","pmids":["12007189"],"is_preprint":false},{"year":2005,"finding":"Rabin8 (human) and its rat equivalent Rabin3 function as guanine nucleotide exchange factors (GEFs) specifically for Rab8 but not for Rab3A or Rab5. Endogenous and ectopically expressed Rabin8 colocalizes with cortical actin; cytochalasin D and phorbol esters induce translocation of both Rabin8 and Rab8 to lamellipodia-like structures. Co-expression of Rabin8 with dominant-negative Rab8 causes relocalization of Rabin8 to vesicular structures enriched in cell protrusions, implicating both proteins in polarized membrane transport.","method":"In vitro nucleotide exchange assay, live cell imaging, co-expression of dominant-negative Rab8, fluorescence microscopy","journal":"Methods in enzymology","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — in vitro GEF assay plus cell biological localization experiments; single lab, two orthogonal methods","pmids":["16473595"],"is_preprint":false},{"year":2011,"finding":"Upon serum withdrawal, Rabin8 relocalizes to Rab11-positive vesicles that are transported to the centrosome to initiate ciliogenesis. Rab11-GTP associates with the Rabin8 C-terminal region and this interaction is required for Rabin8 preciliary membrane trafficking to the centrosome and for ciliogenesis. The TRAPPII complex associates with the Rabin8 N-terminal domain and TRAPPII subunits colocalize with centrosomal Rabin8 and are required for Rabin8 preciliary targeting and ciliogenesis. The BBSome binds Rabin8, which acts as a GEF activating Rab8 for ciliary membrane formation.","method":"Live fluorescence microscopy, tandem affinity purification/mass spectrometry, zebrafish epistasis, co-IP, dominant-negative and knockdown experiments","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (live imaging, TAP-MS, zebrafish genetics, co-IP), replicated across model systems","pmids":["21273506"],"is_preprint":false},{"year":2011,"finding":"Rabin8 co-immunoprecipitates with the GTPase Rheb. Overexpression of Rabin8 suppresses phosphorylation of Ser235/Ser236 in ribosomal protein S6 (a readout of mTORC1 activity), while siRNA-mediated knockdown of Rabin8 increases this phosphorylation, indicating Rabin8 negatively regulates mTORC1 signaling.","method":"Co-immunoprecipitation, siRNA knockdown, Western blotting for pS6","journal":"Acta naturae","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single co-IP and overexpression/knockdown, single lab, no mechanistic follow-up on direct interaction","pmids":["22649696"],"is_preprint":false},{"year":2012,"finding":"NDR1/2 kinases phosphorylate Rabin8 in brain neurons, as identified by chemical genetics (analog-sensitive kinase allele). Rabin8, as an NDR1/2 substrate, regulates dendritic spine development; knockdown or dominant-negative NDR1/2 affects spine morphology, a phenotype linked to Rabin8 activity as a Rab8 GEF.","method":"Chemical genetic substrate identification (analog-sensitive NDR1/2), mass spectrometry, siRNA knockdown, dominant-negative expression, in vivo neuron imaging","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — chemical genetic direct substrate identification combined with in vitro and in vivo functional validation","pmids":["22445341"],"is_preprint":false},{"year":2013,"finding":"NDR2 phosphorylates Rabin8 at Ser-272. This phosphorylation is crucial for ciliogenesis: the non-phosphorylatable S272A mutant causes accumulation of Rabin8/Rab11-containing vesicles at the pericentrosome and impairs preciliary membrane assembly. Mechanistically, Rabin8 binds GTP-bound Rab11 and phosphatidylserine (PS) on pericentrosomal vesicles; the phospho-mimetic S272E mutation decreases affinity for PS but increases affinity for the exocyst component Sec15. Thus NDR2-mediated phosphorylation switches Rabin8 binding specificity from PS to Sec15 to promote Rab8 activation and ciliary membrane formation.","method":"In vitro kinase assay, phospho-mimetic and non-phosphorylatable Rabin8 mutants, binding assays (lipid and protein), immunofluorescence, ciliogenesis assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro kinase assay with mutagenesis, binding specificity assays, and cell biological phenotype; multiple orthogonal methods","pmids":["23435566"],"is_preprint":false},{"year":2013,"finding":"Structural snapshots of the full Rabin8-catalyzed nucleotide exchange reaction for Rab8 were obtained, revealing three distinct enzyme-substrate complexes: Rab8·Rabin8·GDP (ternary), nucleotide-free Rab8·Rabin8 (binary), and Rab8·Rabin8·GTP (ternary product). Enzymatic characterization provided a mechanistic model for Rabin8/GRAB-mediated GEF activity.","method":"Structural analysis (crystal snapshots), in vitro enzymatic characterization of nucleotide exchange","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — structural determination combined with thorough enzymatic characterization of the GEF catalytic cycle","pmids":["24072714"],"is_preprint":false},{"year":2015,"finding":"Rabin8 suppresses autophagosome formation independently of its Rab8-GEF activity: depletion of Rabin8 promotes nutrient starvation-induced autophagosome formation, and a Rabin8 GEF-domain mutant (lacking GEF activity) still rescues this phenotype, while depletion of Rab8 does not affect autophagosome formation. NDR kinase-dependent phosphorylation of Rabin8 at Ser-272 is involved in this suppressive function (non-phosphorylatable S272A fails to rescue). Rabin8's suppressive function in autophagy requires its non-conserved C-terminal region.","method":"siRNA knockdown, GEF-dead mutant expression, non-phosphorylatable mutant rescue assays, autophagosome quantification by microscopy and Western blot","journal":"Journal of biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple mutant rescue experiments in cells; single lab but several orthogonal functional approaches","pmids":["25787272"],"is_preprint":false},{"year":2015,"finding":"The Arf/Rab11 effector FIP3 (RAB11FIP3) coordinates the interactions of ASAP1 and Rab11a with Rabin8 within a targeting complex for ciliary receptor (rhodopsin) trafficking. FIP3 competes with rhodopsin for binding to ASAP1 and shapes the binding pocket for Rabin8 within the ASAP1-Rab11a-FIP3 complex, facilitating assembly and activation of the Rab11-Rabin8-Rab8 cascade during ciliary receptor trafficking.","method":"Co-immunoprecipitation, siRNA ablation of FIP3 with rhodopsin mislocalization readout, epistasis in photoreceptor cells","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — reciprocal co-IP and loss-of-function with defined trafficking phenotype; single lab","pmids":["25673879"],"is_preprint":false},{"year":2019,"finding":"TRAPPC14 (C7orf43/MAP11), a newly identified TRAPPII-specific subunit, directly binds Rabin8 and mediates Rabin8 association with the TRAPPII complex. TRAPPC14 knockdown diminishes Rabin8 preciliary centrosome accumulation. TRAPPC14 also interacts with distal appendage proteins FBF1 and CEP83, which are required for GFP-Rabin8 centrosomal accumulation, supporting a role for the TRAPPII complex in tethering preciliary vesicles containing Rabin8 to the mother centriole.","method":"MS-based interactome identification, co-sedimentation, direct binding assays, siRNA knockdown with ciliogenesis and localization readouts, zebrafish validation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — MS identification combined with direct binding, co-sedimentation, knockdown phenotypes, and zebrafish validation across multiple orthogonal methods","pmids":["31467083"],"is_preprint":false},{"year":2019,"finding":"Phosphorylation of Rab8a at Ser111 (by PINK1 kinase) impairs Rabin8-mediated nucleotide exchange. Mechanistically, pS111 (or the phosphomimetic S111E) establishes an intramolecular interaction with Arg79 in Rab8a, which disrupts a key intermolecular salt bridge between Rab8a Arg79 and Rabin8 Asp187, drastically reducing binding affinity and nucleotide exchange rate (>80% decrease confirmed in vitro).","method":"Molecular dynamics simulations, free energy calculations, in vitro nucleotide exchange assay with Rab8a mutants","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro GEF assay with mutants confirms computational model; single lab, limited experimental replication","pmids":["31361120"],"is_preprint":false},{"year":2020,"finding":"In C. elegans, RABN-8 (Rabin8 ortholog), as a GEF for RAB-8, is required for vulval tumor formation caused by hyperactivated EGFR signaling. Mechanistically, RABN-8 promotes secretion of EGL-17/FGF from vulval precursor cells, connecting the Rab8-Rabin8 trafficking axis to FGF-mediated signaling downstream of EGFR.","method":"RNAi knockdown in C. elegans multivulva model, genetic epistasis, FGFR inhibitor rescue","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis in a defined in vivo model with pharmacological validation; single lab","pmids":["33092268"],"is_preprint":false},{"year":2023,"finding":"CENTLEIN directly binds RABIN8, with a 31-amino acid sequence in the 200–230 region of the RABIN8 GEF domain mediating the interaction. CENTLEIN depletion causes persistent accumulation of RABIN8 at the pericentrosome and primary cilium loss. Expression of full-length but not RABIN8-binding-deficient CENTLEIN rescues the ciliogenesis defect. Expression of activated RAB8A partially reverses cilium loss in CENTLEIN-null cells, placing CENTLEIN upstream of Rabin8-mediated Rab8 activation in ciliogenesis.","method":"Direct binding assay with deletion mapping, siRNA/CRISPR knockdown/knockout, rescue with full-length vs. deletion mutant CENTLEIN, activated RAB8A epistasis","journal":"Acta biochimica et biophysica Sinica","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding with domain mapping plus genetic epistasis; single lab","pmids":["37475549"],"is_preprint":false},{"year":2024,"finding":"Rabin8 acts as the guanine exchange factor activating Rab8 downstream of low-affinity LFA1-dependent outside-in signaling in lymphocytes. Rabin8-mediated Rab8 activation at the cell contact area drives intracellular transport and accumulation of LFA1-containing vesicles at the contact surface, modulating LFA1 avidity (increased frequency of LFA1-ICAM1 interactions without affecting binding lifetime) independent of Rap1.","method":"Super-resolution microscopy, single-molecule imaging on supported lipid bilayers, Rab8 inactivation, live cell imaging","journal":"PNAS nexus","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — super-resolution and single-molecule imaging with functional inactivation assays; single lab","pmids":["39170909"],"is_preprint":false},{"year":2025,"finding":"In Xenopus laevis transgenic rod photoreceptors, Rabin8 accumulates at Golgi exit sites (GESs)/trans-Golgi network and is integrated into rhodopsin transport carriers (RTCs) following NDR2-mediated phosphorylation at S272. Rabin8 mutants deficient in Rab11 binding prevent membrane association. Both GFP-Rabin8 and NDR2 kinase interact with the RTC-associated R-SNARE VAMP7 at the trans-Golgi and GESs. The phosphomimetic S272E mutant integrates into RTCs and supports subsequent Rab8 GEF activity, while the non-phosphorylatable S272A mutant causes GES enlargement and deformation and abnormal membrane advancement, bypassing RTCs—establishing that NDR2 phosphorylation of Rabin8 regulates Rab11-to-Rab8 succession in rhodopsin Golgi-to-cilia trafficking.","method":"Xenopus laevis transgenic photoreceptors expressing GFP-Rabin8 wild-type and mutants, co-immunoprecipitation with VAMP7, confocal and electron microscopy, phospho-mimetic and non-phosphorylatable mutant analysis","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vivo transgenic model with multiple Rabin8 mutants, co-IP with SNARE machinery, and defined morphological phenotypes","pmids":["39774853"],"is_preprint":false},{"year":2025,"finding":"In C. elegans, RABI-1 (Rabin8 ortholog) and RAB-11.2 mediate secondary dendrite branch elimination downstream of the NDR kinase SAX-1 during stress-induced neuronal remodeling. SAX-1 promotes endocytosis during remodeling, and RABI-1/RAB-11.2 effects on tertiary branch elimination are minimal, revealing branch-specific mechanistic requirements.","method":"C. elegans genetic epistasis, RNAi/mutant analysis, dendrite pruning quantification, endocytosis assays","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis in defined in vivo model; preprint, single lab","pmids":["bio_10.1101_2025.06.09.658633"],"is_preprint":true}],"current_model":"RAB3IP (Rabin8) is a guanine nucleotide exchange factor (GEF) that activates Rab8 GTPase; it is recruited to the pericentrosome via Rab11-GTP binding to its C-terminal region and TRAPPII complex interaction with its N-terminal domain, where NDR2 kinase phosphorylation at Ser-272 switches its binding specificity from phosphatidylserine to the exocyst component Sec15, promoting local Rab8 activation and ciliary membrane assembly; beyond ciliogenesis, Rabin8 regulates dendritic spine development, suppresses autophagosome formation independently of its GEF activity (requiring its C-terminal region and Ser-272 phosphorylation), modulates mTORC1 signaling via interaction with Rheb, and mediates LFA1 avidity modulation in lymphocytes through Rab8 activation."},"narrative":{"mechanistic_narrative":"RAB3IP (Rabin8) is a guanine nucleotide exchange factor (GEF) that activates the Rab8 GTPase to drive polarized membrane transport, with a central role in ciliary membrane assembly [PMID:16473595, PMID:21273506, PMID:24072714]. Originally identified through its specific interaction with the Rab3A effector domain [PMID:7532276], its catalytic specificity was resolved as a Rab8-selective GEF, and structural snapshots of the Rab8 exchange reaction captured the ternary GDP, nucleotide-free, and GTP product complexes that define its catalytic cycle [PMID:16473595, PMID:24072714]. During ciliogenesis, Rabin8 is recruited to preciliary membranes via GTP-Rab11 binding to its C-terminal region and the TRAPPII complex binding to its N-terminal domain, where it nucleates a Rab11-to-Rab8 cascade for ciliary membrane formation [PMID:21273506]. NDR2 kinase phosphorylates Rabin8 at Ser-272, switching its binding preference from pericentrosomal phosphatidylserine to the exocyst component Sec15, thereby coupling vesicle docking to local Rab8 activation [PMID:23435566]; in photoreceptors this same phosphorylation governs Rabin8 integration into rhodopsin transport carriers and Rab11-to-Rab8 succession during Golgi-to-cilia trafficking [PMID:39774853]. Centrosomal recruitment is organized by dedicated tethering and scaffolding factors: the TRAPPII subunit TRAPPC14 links Rabin8 to the mother centriole distal appendages [PMID:31467083], CENTLEIN binds the GEF domain to prevent pericentrosomal Rabin8 accumulation [PMID:37475549], and the ASAP1–Rab11a–FIP3 complex shapes the binding pocket that assembles the Rab11–Rabin8–Rab8 cascade for ciliary receptor trafficking [PMID:25673879]. Beyond ciliogenesis, Rabin8 functions as an NDR1/2 substrate in dendritic spine development [PMID:22445341], suppresses starvation-induced autophagosome formation independently of its GEF activity through its C-terminal region and Ser-272 phosphorylation [PMID:25787272], and activates Rab8 to drive LFA1 vesicle transport and avidity modulation in lymphocytes [PMID:39170909].","teleology":[{"year":1995,"claim":"Established RAB3IP as a Rab-interacting protein by identifying its specific association with the Rab3A effector domain and its Sec2p-like sequence, raising but not resolving the question of GEF activity.","evidence":"Yeast two-hybrid, GST pulldown, in vitro GTPase/exchange assays, and effector-domain point mutagenesis of Rab3A","pmids":["7532276"],"confidence":"Medium","gaps":["No detectable in vitro exchange or GAP activity toward Rab3A","True physiological GTPase target unresolved at this stage"]},{"year":2002,"claim":"Identified an interaction with the cancer-associated SSX2 protein that drives nuclear relocalization of cytoplasmic RAB3IP, hinting at regulated subcellular partitioning.","evidence":"Yeast two-hybrid, GST pulldown, and immunofluorescence co-localization in transfected cells","pmids":["12007189"],"confidence":"Medium","gaps":["Functional consequence of nuclear relocalization unknown","Connection to GEF function not established"]},{"year":2005,"claim":"Resolved the catalytic specificity question by defining Rabin8 as a GEF selective for Rab8 (not Rab3A or Rab5), linking it to polarized membrane transport.","evidence":"In vitro nucleotide exchange assays, live-cell imaging, and dominant-negative Rab8 co-expression","pmids":["16473595"],"confidence":"Medium","gaps":["Upstream recruitment mechanism unaddressed","Physiological process driven by Rab8 activation not yet defined"]},{"year":2011,"claim":"Placed Rabin8 at the heart of ciliogenesis by showing GTP-Rab11 and the TRAPPII complex recruit it to the centrosome to activate Rab8 for ciliary membrane formation.","evidence":"Live imaging, TAP-MS, co-IP, zebrafish epistasis, and dominant-negative/knockdown experiments","pmids":["21273506"],"confidence":"High","gaps":["Molecular trigger linking serum withdrawal to Rabin8 relocalization not detailed","Regulation of the Rab11-to-Rab8 handoff unresolved at this stage"]},{"year":2011,"claim":"Suggested a Rab8-independent signaling role by linking Rabin8 to negative regulation of mTORC1 via Rheb.","evidence":"Co-immunoprecipitation, siRNA knockdown, and Western blotting for phospho-S6","pmids":["22649696"],"confidence":"Low","gaps":["Single co-IP with overexpression/knockdown; directness of Rheb interaction not established","No mechanistic follow-up on how Rabin8 affects mTORC1"]},{"year":2012,"claim":"Connected Rabin8 to neuronal morphogenesis by identifying it as an NDR1/2 kinase substrate controlling dendritic spine development.","evidence":"Chemical-genetic substrate identification (analog-sensitive NDR1/2), mass spectrometry, knockdown, and in vivo neuron imaging","pmids":["22445341"],"confidence":"High","gaps":["Phospho-site and downstream effector mechanism in spines not defined here","Quantitative contribution of Rab8 GEF activity to spine phenotype unclear"]},{"year":2013,"claim":"Defined the molecular switch of ciliogenesis: NDR2 phosphorylation at Ser-272 converts Rabin8 binding from phosphatidylserine to the exocyst subunit Sec15 to promote local Rab8 activation.","evidence":"In vitro kinase assays, phospho-mimetic/non-phosphorylatable mutants, lipid and protein binding assays, and ciliogenesis readouts","pmids":["23435566"],"confidence":"High","gaps":["Spatial/temporal control of NDR2 activation at the centrosome unresolved","How the PS-to-Sec15 switch couples to exocyst tethering mechanistically not fully detailed"]},{"year":2013,"claim":"Provided the structural and enzymatic basis of Rabin8 catalysis by capturing the full Rab8 nucleotide-exchange cycle.","evidence":"Crystal structure snapshots and in vitro enzymatic characterization of nucleotide exchange","pmids":["24072714"],"confidence":"High","gaps":["Structures do not capture regulatory phosphorylation or partner-bound states","Allosteric regulation by upstream factors not addressed structurally"]},{"year":2015,"claim":"Revealed a GEF-independent function: Rabin8 suppresses autophagosome formation through its C-terminal region and Ser-272 phosphorylation, separable from Rab8 activation.","evidence":"siRNA knockdown, GEF-dead and non-phosphorylatable mutant rescue, autophagosome quantification by microscopy and Western blot","pmids":["25787272"],"confidence":"Medium","gaps":["Direct effector of the C-terminal suppressive function not identified","Single lab; mechanism linking Ser-272 to autophagy machinery undefined"]},{"year":2015,"claim":"Defined how the Rab11-Rabin8-Rab8 cascade is assembled for ciliary receptor trafficking via the ASAP1-Rab11a-FIP3 targeting complex.","evidence":"Co-immunoprecipitation, FIP3 ablation with rhodopsin mislocalization readout, and epistasis in photoreceptors","pmids":["25673879"],"confidence":"Medium","gaps":["Stoichiometry and dynamics of the targeting complex not resolved","Single lab"]},{"year":2019,"claim":"Identified TRAPPC14 as the TRAPPII subunit that directly binds Rabin8 and tethers it to mother-centriole distal appendages via FBF1/CEP83.","evidence":"MS interactome, co-sedimentation, direct binding assays, siRNA knockdown with localization/ciliogenesis readouts, and zebrafish validation","pmids":["31467083"],"confidence":"High","gaps":["How TRAPPII tethering is temporally coordinated with NDR2 phosphorylation unresolved","Vesicle docking mechanism at distal appendages not fully reconstituted"]},{"year":2019,"claim":"Revealed a negative regulatory layer in which PINK1-driven Rab8a Ser111 phosphorylation disrupts the Rab8a-Rabin8 salt bridge and impairs nucleotide exchange.","evidence":"Molecular dynamics, free-energy calculations, and in vitro nucleotide exchange assays with Rab8a mutants","pmids":["31361120"],"confidence":"Medium","gaps":["Cellular context where pSer111 antagonizes Rabin8 not established experimentally","Single lab; limited experimental replication beyond in vitro assay"]},{"year":2020,"claim":"Extended Rabin8 function to growth-factor secretion, showing the RABN-8/RAB-8 axis is required for EGFR-driven vulval tumor formation via EGL-17/FGF secretion in C. elegans.","evidence":"RNAi knockdown in the C. elegans multivulva model, genetic epistasis, and FGFR inhibitor rescue","pmids":["33092268"],"confidence":"Medium","gaps":["Direct cargo trafficked by RABN-8/RAB-8 not identified","Conservation of the FGF-secretion role in mammals untested"]},{"year":2023,"claim":"Identified CENTLEIN as a direct GEF-domain partner controlling Rabin8 pericentrosomal turnover, placing it upstream of Rabin8-mediated Rab8 activation in ciliogenesis.","evidence":"Direct binding with deletion mapping, knockdown/knockout, rescue with full-length vs binding-deficient CENTLEIN, and activated RAB8A epistasis","pmids":["37475549"],"confidence":"Medium","gaps":["Mechanism by which CENTLEIN prevents pericentrosomal Rabin8 accumulation unresolved","Single lab"]},{"year":2024,"claim":"Demonstrated a role in immune cell adhesion, with Rabin8 activating Rab8 to transport LFA1 vesicles and modulate LFA1-ICAM1 binding frequency independently of Rap1.","evidence":"Super-resolution and single-molecule imaging on supported lipid bilayers, Rab8 inactivation, and live-cell imaging","pmids":["39170909"],"confidence":"Medium","gaps":["Upstream signal coupling LFA1 outside-in signaling to Rabin8 not defined","Single lab"]},{"year":2025,"claim":"Showed in vivo that NDR2 phosphorylation of Rabin8 at Ser-272 governs Rab11-to-Rab8 succession and Rabin8 integration into rhodopsin transport carriers at Golgi exit sites.","evidence":"Xenopus transgenic photoreceptors expressing Rabin8 mutants, co-IP with the R-SNARE VAMP7, and confocal/electron microscopy","pmids":["39774853"],"confidence":"High","gaps":["How VAMP7 association is coordinated with Rab8 activation mechanistically unresolved","Generality of the Golgi-exit-site step beyond photoreceptors untested"]},{"year":2025,"claim":"Extended the NDR-Rabin8-Rab11 axis to stress-induced neuronal remodeling, where RABI-1/RAB-11.2 act downstream of SAX-1 in branch-specific dendrite elimination.","evidence":"C. elegans genetic epistasis, RNAi/mutant analysis, dendrite pruning and endocytosis assays (preprint)","pmids":["bio_10.1101_2025.06.09.658633"],"confidence":"Medium","gaps":["Molecular cargo trafficked during branch elimination not identified","Preprint; single lab"]},{"year":null,"claim":"How the multiple recruitment, scaffolding, and phosphoregulatory inputs are integrated to set the timing and site of Rabin8-mediated Rab8 activation across its different cellular processes remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model coordinating TRAPPII tethering, NDR2 phosphorylation, and Rab11 binding in time","GEF-independent functions (autophagy, mTORC1) lack defined molecular effectors","Disease relevance in humans not established by direct evidence in the corpus"]}],"mechanism_profile":{"molecular_activity":[],"localization":[{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[3,6,10,13]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[15]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[3,6,15]},{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[3,9,13]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[1,2]}],"pathway":[{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[3,6,10,13]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[2,9,15]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[8]}],"complexes":[],"partners":["RAB8A","RAB11A","TRAPPC14","CENTLEIN","RAB11FIP3","VAMP7","RHEB","SSX2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96QF0","full_name":"Rab-3A-interacting protein","aliases":["Rabin-3","Rabin8","SSX2-interacting protein"],"length_aa":476,"mass_kda":53.0,"function":"Guanine nucleotide exchange factor (GEF) which may activate RAB8A and RAB8B (PubMed:12221131, PubMed:26824392). Promotes the exchange of GDP to GTP, converting inactive GDP-bound Rab proteins into their active GTP-bound form (PubMed:12221131, PubMed:26824392). Mediates the release of GDP from RAB8A and RAB8B but not from RAB3A or RAB5 (PubMed:20937701, PubMed:26824392). Modulates actin organization and promotes polarized transport of RAB8A-specific vesicles to the cell surface (PubMed:12221131). Together with RAB11A, RAB8A, the exocyst complex, PARD3, PRKCI, ANXA2, CDC42 and DNMBP promotes transcytosis of PODXL to the apical membrane initiation sites (AMIS), apical surface formation and lumenogenesis (PubMed:20890297). Part of the ciliary targeting complex containing Rab11, ASAP1, RAB3IP and RAB11FIP3 and ARF4 that promotes RAB3IP preciliary vesicle trafficking to mother centriole and ciliogenesis initiation (PubMed:25673879, PubMed:31204173)","subcellular_location":"Cytoplasm; Nucleus; Cytoplasm, cytoskeleton; Cell projection, lamellipodium; Vesicle; Cytoplasm, cytoskeleton, microtubule organizing center, centrosome","url":"https://www.uniprot.org/uniprotkb/Q96QF0/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RAB3IP","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"SF3A1","stoichiometry":0.2},{"gene":"SF3B1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/RAB3IP","total_profiled":1310},"omim":[{"mim_id":"608690","title":"SSX2-INTERACTING PROTEIN; SSX2IP","url":"https://www.omim.org/entry/608690"},{"mim_id":"608686","title":"RAB3A-INTERACTING PROTEIN; RAB3IP","url":"https://www.omim.org/entry/608686"},{"mim_id":"608132","title":"TETRATRICOPEPTIDE REPEAT DOMAIN-CONTAINING PROTEIN 8; TTC8","url":"https://www.omim.org/entry/608132"},{"mim_id":"607968","title":"PARATHYROID HORMONE-RESPONSIVE B1 GENE","url":"https://www.omim.org/entry/607968"},{"mim_id":"607590","title":"BBS7 GENE; BBS7","url":"https://www.omim.org/entry/607590"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Centrosome","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"choroid plexus","ntpm":109.6}],"url":"https://www.proteinatlas.org/search/RAB3IP"},"hgnc":{"alias_symbol":["RABIN3","FLJ22548","RABIN8"],"prev_symbol":[]},"alphafold":{"accession":"Q96QF0","domains":[{"cath_id":"-","chopping":"328-377_386-470","consensus_level":"medium","plddt":94.6587,"start":328,"end":470},{"cath_id":"1.20.5","chopping":"167-258","consensus_level":"medium","plddt":96.0387,"start":167,"end":258}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96QF0","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96QF0-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96QF0-F1-predicted_aligned_error_v6.png","plddt_mean":70.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RAB3IP","jax_strain_url":"https://www.jax.org/strain/search?query=RAB3IP"},"sequence":{"accession":"Q96QF0","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96QF0.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96QF0/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96QF0"}},"corpus_meta":[{"pmid":"21273506","id":"PMC_21273506","title":"Primary cilia membrane assembly is initiated by Rab11 and transport protein particle II (TRAPPII) complex-dependent trafficking of Rabin8 to the centrosome.","date":"2011","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/21273506","citation_count":350,"is_preprint":false},{"pmid":"22445341","id":"PMC_22445341","title":"Chemical genetic identification of NDR1/2 kinase substrates AAK1 and Rabin8 Uncovers their roles in dendrite arborization and spine development.","date":"2012","source":"Neuron","url":"https://pubmed.ncbi.nlm.nih.gov/22445341","citation_count":116,"is_preprint":false},{"pmid":"30738012","id":"PMC_30738012","title":"LncRNA HOTAIR targets miR-126-5p to promote the progression of Parkinson's disease through RAB3IP.","date":"2019","source":"Biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/30738012","citation_count":86,"is_preprint":false},{"pmid":"23435566","id":"PMC_23435566","title":"NDR2-mediated Rabin8 phosphorylation is crucial for ciliogenesis by switching binding specificity from phosphatidylserine to Sec15.","date":"2013","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/23435566","citation_count":84,"is_preprint":false},{"pmid":"7532276","id":"PMC_7532276","title":"Interaction cloning of Rabin3, a novel protein that associates with the Ras-like GTPase Rab3A.","date":"1995","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/7532276","citation_count":71,"is_preprint":false},{"pmid":"24072714","id":"PMC_24072714","title":"Intermediates in the guanine nucleotide exchange reaction of Rab8 protein catalyzed by guanine nucleotide exchange factors Rabin8 and GRAB.","date":"2013","source":"The Journal of biological 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elegans</i>","date":"2025-06-12","source":"bioRxiv","url":"https://doi.org/10.1101/2025.06.09.658633","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":14365,"output_tokens":5146,"usd":0.060143,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":13383,"output_tokens":5406,"usd":0.101032,"stage2_stop_reason":"end_turn"},"total_usd":0.161175,"stage1_batch_id":"msgbatch_01CNoDbkChHEkgrJnL7BwtGJ","stage2_batch_id":"msgbatch_016Y4x9E9Wg5VQDANj9quSQD","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1995,\n      \"finding\": \"Rabin3 (RAB3IP) was identified as a novel protein that interacts specifically with Rab3A and Rab3D (but not Rab3C, Rab2, Ran, or Ras) via the effector domain of Rab3A; point mutations F51L, V55E, and G56D in the effector domain of Rab3A abolish the interaction. The protein contains a region of sequence similarity to the yeast Sec2p GEF. However, in vitro the GST-Rabin3 fusion protein associates only weakly with recombinant Rab3A and possesses no detectable GTPase-activating protein or nucleotide exchange activity toward Rab3A.\",\n      \"method\": \"Yeast two-hybrid screen, GST pulldown, in vitro GTPase assays, point mutagenesis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — yeast two-hybrid with mutagenesis validation and in vitro assays; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"7532276\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"RAB3IP (human Rabin3/Rabin8) physically interacts with the cancer-related protein SSX2 in vitro and in cells. GST pulldown confirmed direct interaction. Co-expression of RAB3IP and SSX2 causes relocalization of the normally cytoplasmic RAB3IP to the nucleus. The interaction maps to the N-terminal moiety of SSX2, and RAB3IP does not interact with SSX1, SSX3, or SSX4.\",\n      \"method\": \"Yeast two-hybrid, GST pulldown, immunofluorescence co-localization in transfected cells\",\n      \"journal\": \"Genes, chromosomes & cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — reciprocal yeast two-hybrid and GST pulldown with localization data; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"12007189\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Rabin8 (human) and its rat equivalent Rabin3 function as guanine nucleotide exchange factors (GEFs) specifically for Rab8 but not for Rab3A or Rab5. Endogenous and ectopically expressed Rabin8 colocalizes with cortical actin; cytochalasin D and phorbol esters induce translocation of both Rabin8 and Rab8 to lamellipodia-like structures. Co-expression of Rabin8 with dominant-negative Rab8 causes relocalization of Rabin8 to vesicular structures enriched in cell protrusions, implicating both proteins in polarized membrane transport.\",\n      \"method\": \"In vitro nucleotide exchange assay, live cell imaging, co-expression of dominant-negative Rab8, fluorescence microscopy\",\n      \"journal\": \"Methods in enzymology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro GEF assay plus cell biological localization experiments; single lab, two orthogonal methods\",\n      \"pmids\": [\"16473595\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Upon serum withdrawal, Rabin8 relocalizes to Rab11-positive vesicles that are transported to the centrosome to initiate ciliogenesis. Rab11-GTP associates with the Rabin8 C-terminal region and this interaction is required for Rabin8 preciliary membrane trafficking to the centrosome and for ciliogenesis. The TRAPPII complex associates with the Rabin8 N-terminal domain and TRAPPII subunits colocalize with centrosomal Rabin8 and are required for Rabin8 preciliary targeting and ciliogenesis. The BBSome binds Rabin8, which acts as a GEF activating Rab8 for ciliary membrane formation.\",\n      \"method\": \"Live fluorescence microscopy, tandem affinity purification/mass spectrometry, zebrafish epistasis, co-IP, dominant-negative and knockdown experiments\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (live imaging, TAP-MS, zebrafish genetics, co-IP), replicated across model systems\",\n      \"pmids\": [\"21273506\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Rabin8 co-immunoprecipitates with the GTPase Rheb. Overexpression of Rabin8 suppresses phosphorylation of Ser235/Ser236 in ribosomal protein S6 (a readout of mTORC1 activity), while siRNA-mediated knockdown of Rabin8 increases this phosphorylation, indicating Rabin8 negatively regulates mTORC1 signaling.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, Western blotting for pS6\",\n      \"journal\": \"Acta naturae\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single co-IP and overexpression/knockdown, single lab, no mechanistic follow-up on direct interaction\",\n      \"pmids\": [\"22649696\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"NDR1/2 kinases phosphorylate Rabin8 in brain neurons, as identified by chemical genetics (analog-sensitive kinase allele). Rabin8, as an NDR1/2 substrate, regulates dendritic spine development; knockdown or dominant-negative NDR1/2 affects spine morphology, a phenotype linked to Rabin8 activity as a Rab8 GEF.\",\n      \"method\": \"Chemical genetic substrate identification (analog-sensitive NDR1/2), mass spectrometry, siRNA knockdown, dominant-negative expression, in vivo neuron imaging\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — chemical genetic direct substrate identification combined with in vitro and in vivo functional validation\",\n      \"pmids\": [\"22445341\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NDR2 phosphorylates Rabin8 at Ser-272. This phosphorylation is crucial for ciliogenesis: the non-phosphorylatable S272A mutant causes accumulation of Rabin8/Rab11-containing vesicles at the pericentrosome and impairs preciliary membrane assembly. Mechanistically, Rabin8 binds GTP-bound Rab11 and phosphatidylserine (PS) on pericentrosomal vesicles; the phospho-mimetic S272E mutation decreases affinity for PS but increases affinity for the exocyst component Sec15. Thus NDR2-mediated phosphorylation switches Rabin8 binding specificity from PS to Sec15 to promote Rab8 activation and ciliary membrane formation.\",\n      \"method\": \"In vitro kinase assay, phospho-mimetic and non-phosphorylatable Rabin8 mutants, binding assays (lipid and protein), immunofluorescence, ciliogenesis assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro kinase assay with mutagenesis, binding specificity assays, and cell biological phenotype; multiple orthogonal methods\",\n      \"pmids\": [\"23435566\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Structural snapshots of the full Rabin8-catalyzed nucleotide exchange reaction for Rab8 were obtained, revealing three distinct enzyme-substrate complexes: Rab8·Rabin8·GDP (ternary), nucleotide-free Rab8·Rabin8 (binary), and Rab8·Rabin8·GTP (ternary product). Enzymatic characterization provided a mechanistic model for Rabin8/GRAB-mediated GEF activity.\",\n      \"method\": \"Structural analysis (crystal snapshots), in vitro enzymatic characterization of nucleotide exchange\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — structural determination combined with thorough enzymatic characterization of the GEF catalytic cycle\",\n      \"pmids\": [\"24072714\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Rabin8 suppresses autophagosome formation independently of its Rab8-GEF activity: depletion of Rabin8 promotes nutrient starvation-induced autophagosome formation, and a Rabin8 GEF-domain mutant (lacking GEF activity) still rescues this phenotype, while depletion of Rab8 does not affect autophagosome formation. NDR kinase-dependent phosphorylation of Rabin8 at Ser-272 is involved in this suppressive function (non-phosphorylatable S272A fails to rescue). Rabin8's suppressive function in autophagy requires its non-conserved C-terminal region.\",\n      \"method\": \"siRNA knockdown, GEF-dead mutant expression, non-phosphorylatable mutant rescue assays, autophagosome quantification by microscopy and Western blot\",\n      \"journal\": \"Journal of biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple mutant rescue experiments in cells; single lab but several orthogonal functional approaches\",\n      \"pmids\": [\"25787272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The Arf/Rab11 effector FIP3 (RAB11FIP3) coordinates the interactions of ASAP1 and Rab11a with Rabin8 within a targeting complex for ciliary receptor (rhodopsin) trafficking. FIP3 competes with rhodopsin for binding to ASAP1 and shapes the binding pocket for Rabin8 within the ASAP1-Rab11a-FIP3 complex, facilitating assembly and activation of the Rab11-Rabin8-Rab8 cascade during ciliary receptor trafficking.\",\n      \"method\": \"Co-immunoprecipitation, siRNA ablation of FIP3 with rhodopsin mislocalization readout, epistasis in photoreceptor cells\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — reciprocal co-IP and loss-of-function with defined trafficking phenotype; single lab\",\n      \"pmids\": [\"25673879\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TRAPPC14 (C7orf43/MAP11), a newly identified TRAPPII-specific subunit, directly binds Rabin8 and mediates Rabin8 association with the TRAPPII complex. TRAPPC14 knockdown diminishes Rabin8 preciliary centrosome accumulation. TRAPPC14 also interacts with distal appendage proteins FBF1 and CEP83, which are required for GFP-Rabin8 centrosomal accumulation, supporting a role for the TRAPPII complex in tethering preciliary vesicles containing Rabin8 to the mother centriole.\",\n      \"method\": \"MS-based interactome identification, co-sedimentation, direct binding assays, siRNA knockdown with ciliogenesis and localization readouts, zebrafish validation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — MS identification combined with direct binding, co-sedimentation, knockdown phenotypes, and zebrafish validation across multiple orthogonal methods\",\n      \"pmids\": [\"31467083\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Phosphorylation of Rab8a at Ser111 (by PINK1 kinase) impairs Rabin8-mediated nucleotide exchange. Mechanistically, pS111 (or the phosphomimetic S111E) establishes an intramolecular interaction with Arg79 in Rab8a, which disrupts a key intermolecular salt bridge between Rab8a Arg79 and Rabin8 Asp187, drastically reducing binding affinity and nucleotide exchange rate (>80% decrease confirmed in vitro).\",\n      \"method\": \"Molecular dynamics simulations, free energy calculations, in vitro nucleotide exchange assay with Rab8a mutants\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro GEF assay with mutants confirms computational model; single lab, limited experimental replication\",\n      \"pmids\": [\"31361120\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"In C. elegans, RABN-8 (Rabin8 ortholog), as a GEF for RAB-8, is required for vulval tumor formation caused by hyperactivated EGFR signaling. Mechanistically, RABN-8 promotes secretion of EGL-17/FGF from vulval precursor cells, connecting the Rab8-Rabin8 trafficking axis to FGF-mediated signaling downstream of EGFR.\",\n      \"method\": \"RNAi knockdown in C. elegans multivulva model, genetic epistasis, FGFR inhibitor rescue\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis in a defined in vivo model with pharmacological validation; single lab\",\n      \"pmids\": [\"33092268\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CENTLEIN directly binds RABIN8, with a 31-amino acid sequence in the 200–230 region of the RABIN8 GEF domain mediating the interaction. CENTLEIN depletion causes persistent accumulation of RABIN8 at the pericentrosome and primary cilium loss. Expression of full-length but not RABIN8-binding-deficient CENTLEIN rescues the ciliogenesis defect. Expression of activated RAB8A partially reverses cilium loss in CENTLEIN-null cells, placing CENTLEIN upstream of Rabin8-mediated Rab8 activation in ciliogenesis.\",\n      \"method\": \"Direct binding assay with deletion mapping, siRNA/CRISPR knockdown/knockout, rescue with full-length vs. deletion mutant CENTLEIN, activated RAB8A epistasis\",\n      \"journal\": \"Acta biochimica et biophysica Sinica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding with domain mapping plus genetic epistasis; single lab\",\n      \"pmids\": [\"37475549\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Rabin8 acts as the guanine exchange factor activating Rab8 downstream of low-affinity LFA1-dependent outside-in signaling in lymphocytes. Rabin8-mediated Rab8 activation at the cell contact area drives intracellular transport and accumulation of LFA1-containing vesicles at the contact surface, modulating LFA1 avidity (increased frequency of LFA1-ICAM1 interactions without affecting binding lifetime) independent of Rap1.\",\n      \"method\": \"Super-resolution microscopy, single-molecule imaging on supported lipid bilayers, Rab8 inactivation, live cell imaging\",\n      \"journal\": \"PNAS nexus\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — super-resolution and single-molecule imaging with functional inactivation assays; single lab\",\n      \"pmids\": [\"39170909\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In Xenopus laevis transgenic rod photoreceptors, Rabin8 accumulates at Golgi exit sites (GESs)/trans-Golgi network and is integrated into rhodopsin transport carriers (RTCs) following NDR2-mediated phosphorylation at S272. Rabin8 mutants deficient in Rab11 binding prevent membrane association. Both GFP-Rabin8 and NDR2 kinase interact with the RTC-associated R-SNARE VAMP7 at the trans-Golgi and GESs. The phosphomimetic S272E mutant integrates into RTCs and supports subsequent Rab8 GEF activity, while the non-phosphorylatable S272A mutant causes GES enlargement and deformation and abnormal membrane advancement, bypassing RTCs—establishing that NDR2 phosphorylation of Rabin8 regulates Rab11-to-Rab8 succession in rhodopsin Golgi-to-cilia trafficking.\",\n      \"method\": \"Xenopus laevis transgenic photoreceptors expressing GFP-Rabin8 wild-type and mutants, co-immunoprecipitation with VAMP7, confocal and electron microscopy, phospho-mimetic and non-phosphorylatable mutant analysis\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vivo transgenic model with multiple Rabin8 mutants, co-IP with SNARE machinery, and defined morphological phenotypes\",\n      \"pmids\": [\"39774853\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In C. elegans, RABI-1 (Rabin8 ortholog) and RAB-11.2 mediate secondary dendrite branch elimination downstream of the NDR kinase SAX-1 during stress-induced neuronal remodeling. SAX-1 promotes endocytosis during remodeling, and RABI-1/RAB-11.2 effects on tertiary branch elimination are minimal, revealing branch-specific mechanistic requirements.\",\n      \"method\": \"C. elegans genetic epistasis, RNAi/mutant analysis, dendrite pruning quantification, endocytosis assays\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis in defined in vivo model; preprint, single lab\",\n      \"pmids\": [\"bio_10.1101_2025.06.09.658633\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"RAB3IP (Rabin8) is a guanine nucleotide exchange factor (GEF) that activates Rab8 GTPase; it is recruited to the pericentrosome via Rab11-GTP binding to its C-terminal region and TRAPPII complex interaction with its N-terminal domain, where NDR2 kinase phosphorylation at Ser-272 switches its binding specificity from phosphatidylserine to the exocyst component Sec15, promoting local Rab8 activation and ciliary membrane assembly; beyond ciliogenesis, Rabin8 regulates dendritic spine development, suppresses autophagosome formation independently of its GEF activity (requiring its C-terminal region and Ser-272 phosphorylation), modulates mTORC1 signaling via interaction with Rheb, and mediates LFA1 avidity modulation in lymphocytes through Rab8 activation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RAB3IP (Rabin8) is a guanine nucleotide exchange factor (GEF) that activates the Rab8 GTPase to drive polarized membrane transport, with a central role in ciliary membrane assembly [#2, #3, #7]. Originally identified through its specific interaction with the Rab3A effector domain [#0], its catalytic specificity was resolved as a Rab8-selective GEF, and structural snapshots of the Rab8 exchange reaction captured the ternary GDP, nucleotide-free, and GTP product complexes that define its catalytic cycle [#2, #7]. During ciliogenesis, Rabin8 is recruited to preciliary membranes via GTP-Rab11 binding to its C-terminal region and the TRAPPII complex binding to its N-terminal domain, where it nucleates a Rab11-to-Rab8 cascade for ciliary membrane formation [#3]. NDR2 kinase phosphorylates Rabin8 at Ser-272, switching its binding preference from pericentrosomal phosphatidylserine to the exocyst component Sec15, thereby coupling vesicle docking to local Rab8 activation [#6]; in photoreceptors this same phosphorylation governs Rabin8 integration into rhodopsin transport carriers and Rab11-to-Rab8 succession during Golgi-to-cilia trafficking [#15]. Centrosomal recruitment is organized by dedicated tethering and scaffolding factors: the TRAPPII subunit TRAPPC14 links Rabin8 to the mother centriole distal appendages [#10], CENTLEIN binds the GEF domain to prevent pericentrosomal Rabin8 accumulation [#13], and the ASAP1–Rab11a–FIP3 complex shapes the binding pocket that assembles the Rab11–Rabin8–Rab8 cascade for ciliary receptor trafficking [#9]. Beyond ciliogenesis, Rabin8 functions as an NDR1/2 substrate in dendritic spine development [#5], suppresses starvation-induced autophagosome formation independently of its GEF activity through its C-terminal region and Ser-272 phosphorylation [#8], and activates Rab8 to drive LFA1 vesicle transport and avidity modulation in lymphocytes [#14].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Established RAB3IP as a Rab-interacting protein by identifying its specific association with the Rab3A effector domain and its Sec2p-like sequence, raising but not resolving the question of GEF activity.\",\n      \"evidence\": \"Yeast two-hybrid, GST pulldown, in vitro GTPase/exchange assays, and effector-domain point mutagenesis of Rab3A\",\n      \"pmids\": [\"7532276\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No detectable in vitro exchange or GAP activity toward Rab3A\", \"True physiological GTPase target unresolved at this stage\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identified an interaction with the cancer-associated SSX2 protein that drives nuclear relocalization of cytoplasmic RAB3IP, hinting at regulated subcellular partitioning.\",\n      \"evidence\": \"Yeast two-hybrid, GST pulldown, and immunofluorescence co-localization in transfected cells\",\n      \"pmids\": [\"12007189\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of nuclear relocalization unknown\", \"Connection to GEF function not established\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Resolved the catalytic specificity question by defining Rabin8 as a GEF selective for Rab8 (not Rab3A or Rab5), linking it to polarized membrane transport.\",\n      \"evidence\": \"In vitro nucleotide exchange assays, live-cell imaging, and dominant-negative Rab8 co-expression\",\n      \"pmids\": [\"16473595\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Upstream recruitment mechanism unaddressed\", \"Physiological process driven by Rab8 activation not yet defined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Placed Rabin8 at the heart of ciliogenesis by showing GTP-Rab11 and the TRAPPII complex recruit it to the centrosome to activate Rab8 for ciliary membrane formation.\",\n      \"evidence\": \"Live imaging, TAP-MS, co-IP, zebrafish epistasis, and dominant-negative/knockdown experiments\",\n      \"pmids\": [\"21273506\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular trigger linking serum withdrawal to Rabin8 relocalization not detailed\", \"Regulation of the Rab11-to-Rab8 handoff unresolved at this stage\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Suggested a Rab8-independent signaling role by linking Rabin8 to negative regulation of mTORC1 via Rheb.\",\n      \"evidence\": \"Co-immunoprecipitation, siRNA knockdown, and Western blotting for phospho-S6\",\n      \"pmids\": [\"22649696\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single co-IP with overexpression/knockdown; directness of Rheb interaction not established\", \"No mechanistic follow-up on how Rabin8 affects mTORC1\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Connected Rabin8 to neuronal morphogenesis by identifying it as an NDR1/2 kinase substrate controlling dendritic spine development.\",\n      \"evidence\": \"Chemical-genetic substrate identification (analog-sensitive NDR1/2), mass spectrometry, knockdown, and in vivo neuron imaging\",\n      \"pmids\": [\"22445341\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phospho-site and downstream effector mechanism in spines not defined here\", \"Quantitative contribution of Rab8 GEF activity to spine phenotype unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined the molecular switch of ciliogenesis: NDR2 phosphorylation at Ser-272 converts Rabin8 binding from phosphatidylserine to the exocyst subunit Sec15 to promote local Rab8 activation.\",\n      \"evidence\": \"In vitro kinase assays, phospho-mimetic/non-phosphorylatable mutants, lipid and protein binding assays, and ciliogenesis readouts\",\n      \"pmids\": [\"23435566\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Spatial/temporal control of NDR2 activation at the centrosome unresolved\", \"How the PS-to-Sec15 switch couples to exocyst tethering mechanistically not fully detailed\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Provided the structural and enzymatic basis of Rabin8 catalysis by capturing the full Rab8 nucleotide-exchange cycle.\",\n      \"evidence\": \"Crystal structure snapshots and in vitro enzymatic characterization of nucleotide exchange\",\n      \"pmids\": [\"24072714\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structures do not capture regulatory phosphorylation or partner-bound states\", \"Allosteric regulation by upstream factors not addressed structurally\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Revealed a GEF-independent function: Rabin8 suppresses autophagosome formation through its C-terminal region and Ser-272 phosphorylation, separable from Rab8 activation.\",\n      \"evidence\": \"siRNA knockdown, GEF-dead and non-phosphorylatable mutant rescue, autophagosome quantification by microscopy and Western blot\",\n      \"pmids\": [\"25787272\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct effector of the C-terminal suppressive function not identified\", \"Single lab; mechanism linking Ser-272 to autophagy machinery undefined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined how the Rab11-Rabin8-Rab8 cascade is assembled for ciliary receptor trafficking via the ASAP1-Rab11a-FIP3 targeting complex.\",\n      \"evidence\": \"Co-immunoprecipitation, FIP3 ablation with rhodopsin mislocalization readout, and epistasis in photoreceptors\",\n      \"pmids\": [\"25673879\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Stoichiometry and dynamics of the targeting complex not resolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified TRAPPC14 as the TRAPPII subunit that directly binds Rabin8 and tethers it to mother-centriole distal appendages via FBF1/CEP83.\",\n      \"evidence\": \"MS interactome, co-sedimentation, direct binding assays, siRNA knockdown with localization/ciliogenesis readouts, and zebrafish validation\",\n      \"pmids\": [\"31467083\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How TRAPPII tethering is temporally coordinated with NDR2 phosphorylation unresolved\", \"Vesicle docking mechanism at distal appendages not fully reconstituted\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Revealed a negative regulatory layer in which PINK1-driven Rab8a Ser111 phosphorylation disrupts the Rab8a-Rabin8 salt bridge and impairs nucleotide exchange.\",\n      \"evidence\": \"Molecular dynamics, free-energy calculations, and in vitro nucleotide exchange assays with Rab8a mutants\",\n      \"pmids\": [\"31361120\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cellular context where pSer111 antagonizes Rabin8 not established experimentally\", \"Single lab; limited experimental replication beyond in vitro assay\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Extended Rabin8 function to growth-factor secretion, showing the RABN-8/RAB-8 axis is required for EGFR-driven vulval tumor formation via EGL-17/FGF secretion in C. elegans.\",\n      \"evidence\": \"RNAi knockdown in the C. elegans multivulva model, genetic epistasis, and FGFR inhibitor rescue\",\n      \"pmids\": [\"33092268\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct cargo trafficked by RABN-8/RAB-8 not identified\", \"Conservation of the FGF-secretion role in mammals untested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified CENTLEIN as a direct GEF-domain partner controlling Rabin8 pericentrosomal turnover, placing it upstream of Rabin8-mediated Rab8 activation in ciliogenesis.\",\n      \"evidence\": \"Direct binding with deletion mapping, knockdown/knockout, rescue with full-length vs binding-deficient CENTLEIN, and activated RAB8A epistasis\",\n      \"pmids\": [\"37475549\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which CENTLEIN prevents pericentrosomal Rabin8 accumulation unresolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrated a role in immune cell adhesion, with Rabin8 activating Rab8 to transport LFA1 vesicles and modulate LFA1-ICAM1 binding frequency independently of Rap1.\",\n      \"evidence\": \"Super-resolution and single-molecule imaging on supported lipid bilayers, Rab8 inactivation, and live-cell imaging\",\n      \"pmids\": [\"39170909\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Upstream signal coupling LFA1 outside-in signaling to Rabin8 not defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Showed in vivo that NDR2 phosphorylation of Rabin8 at Ser-272 governs Rab11-to-Rab8 succession and Rabin8 integration into rhodopsin transport carriers at Golgi exit sites.\",\n      \"evidence\": \"Xenopus transgenic photoreceptors expressing Rabin8 mutants, co-IP with the R-SNARE VAMP7, and confocal/electron microscopy\",\n      \"pmids\": [\"39774853\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How VAMP7 association is coordinated with Rab8 activation mechanistically unresolved\", \"Generality of the Golgi-exit-site step beyond photoreceptors untested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended the NDR-Rabin8-Rab11 axis to stress-induced neuronal remodeling, where RABI-1/RAB-11.2 act downstream of SAX-1 in branch-specific dendrite elimination.\",\n      \"evidence\": \"C. elegans genetic epistasis, RNAi/mutant analysis, dendrite pruning and endocytosis assays (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.06.09.658633\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular cargo trafficked during branch elimination not identified\", \"Preprint; single lab\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the multiple recruitment, scaffolding, and phosphoregulatory inputs are integrated to set the timing and site of Rabin8-mediated Rab8 activation across its different cellular processes remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model coordinating TRAPPII tethering, NDR2 phosphorylation, and Rab11 binding in time\", \"GEF-independent functions (autophagy, mTORC1) lack defined molecular effectors\", \"Disease relevance in humans not established by direct evidence in the corpus\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005085\", \"supporting_discovery_ids\": [2, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [3, 6, 10, 13]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [15]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [3, 6, 15]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [3, 9, 13]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [3, 6, 10, 13]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [2, 9, 15]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"RAB8A\", \"RAB11A\", \"TRAPPC14\", \"CENTLEIN\", \"RAB11FIP3\", \"VAMP7\", \"RHEB\", \"SSX2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}