{"gene":"RAB17","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":1993,"finding":"RAB17 is a small GTPase specific to epithelial cells, induced upon mesenchymal-to-epithelial differentiation during kidney development, and localizes to the basolateral plasma membrane and apical tubules, suggesting a role in transcellular transport.","method":"Northern blot, in situ hybridization, immunofluorescence, immunoelectron microscopy on mouse kidney sections","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization by immunoelectron microscopy with functional inference, single lab, two orthogonal methods","pmids":["8486736"],"is_preprint":false},{"year":1998,"finding":"RAB17 associates with the apical recycling endosome in polarized Eph4 epithelial cells and with the perinuclear recycling endosome in non-polarized BHK-21 cells; dominant-negative (GTP-binding deficient) and constitutively active (hydrolysis-deficient) RAB17 mutants specifically increased basolateral-to-apical transcytosis of transferrin receptor and FcLR chimeric receptor, and stimulated apical recycling, establishing RAB17 as a regulator of traffic through the apical recycling endosome.","method":"Confocal immunofluorescence microscopy, expression of GTPase mutants, transcytosis assays in polarized Eph4 cells","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal functional assays with GTPase mutants and direct colocalization, multiple orthogonal methods, replicated in two cell systems","pmids":["9490718"],"is_preprint":false},{"year":1998,"finding":"RAB17 localizes to small vesicles and tubules in the apical region of MDCK cells, colocalizes with dimeric IgA internalized via the polymeric immunoglobulin receptor (pIgR) from both apical and basolateral surfaces, and overexpression of RAB17 impairs basolateral-to-apical transcytosis of dimeric IgA, providing morphological and functional evidence for RAB17 in regulating transcellular traffic through apical recycling endosomes.","method":"Stable MDCK cell lines expressing wild-type or mutant RAB17 and pIgR, immunofluorescence/electron microscopy, IgA transcytosis assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function and gain-of-function with defined biochemical phenotype, multiple orthogonal methods","pmids":["9624171"],"is_preprint":false},{"year":1999,"finding":"RAB17 colocalizes with IgA along the basolateral plasma membrane and in basolateral endosomes/vesicles of mouse enterocytes, supporting its involvement in IgA transcytosis through raft-containing compartments in vivo.","method":"Immunogold electron microscopy on mouse small intestinal explants","journal":"Gastroenterology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct colocalization by immunoelectron microscopy, single lab, single method","pmids":["10029620"],"is_preprint":false},{"year":2011,"finding":"RAB17 localizes to recycling endosomes and melanosomes in melanocytic cells; siRNA knockdown of RAB17 causes accumulation of melanosomes at the cell periphery and increased melanin retention inside cells, inhibits filopodia formation, and acts downstream of RAB27a in the melanosome release pathway.","method":"GFP-RAB17 live imaging, siRNA knockdown, double knockdown with RAB27a, melanin quantification, filopodia counting in melanoma cells","journal":"Traffic","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown with defined cellular phenotypes, epistasis with RAB27a, two orthogonal readouts, single lab","pmids":["21291502"],"is_preprint":false},{"year":2012,"finding":"RAB17 localizes specifically to dendritic growth cones, shafts, filopodia, and mature spines (but not axons) in mouse hippocampal neurons; shRNA-mediated knockdown reduces dendrite growth, branching, and dendritic spine number, identifying RAB17 as a regulator of dendrite-specific membrane trafficking and postsynaptic development.","method":"shRNA knockdown, immunofluorescence, morphometric analysis in mouse hippocampal neurons","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — shRNA knockdown with multiple defined morphological phenotypes, compartment-specific localization, single lab","pmids":["22291024"],"is_preprint":false},{"year":2012,"finding":"ERK2 (but not ERK1) suppresses RAB17 gene expression, and knockdown of RAB17 restores invasive migration in ERK2-depleted MDA-MB-231 cancer cells, placing RAB17 downstream of ERK2 as an inhibitor of invasive migration in 3D matrices.","method":"ERK2 siRNA knockdown, gene expression arrays, RAB17 siRNA knockdown in ERK2-depleted cells, 3D invasion assays","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis by double knockdown, gene array plus functional validation, single lab","pmids":["22328529"],"is_preprint":false},{"year":2013,"finding":"Rabex-5 (a Rab5-GEF) interacts with a GDP-locked RAB17 mutant and promotes translocation of RAB17 from the cell body to the dendrites of developing mouse hippocampal neurons; shRNA knockdown of Rabex-5 inhibits both axon and dendrite morphogenesis, while RAB17 knockdown affects dendrite morphogenesis alone, indicating Rabex-5 acts upstream of RAB17 as its GEF to regulate dendritogenesis.","method":"Yeast two-hybrid screen with GDP-locked RAB17 as bait, shRNA knockdown, live-cell fluorescence imaging in mouse hippocampal neurons","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid plus shRNA epistasis with distinct phenotypic readouts, single lab","pmids":["23430262"],"is_preprint":false},{"year":2014,"finding":"RAB17 knockdown reduces surface expression of the kainate receptor subunit GluK2, but not AMPA receptor subunit GluA1; RAB17 colocalizes with Syntaxin-4 in dendrites, and RAB17 knockdown causes Syntaxin-4 redistribution from dendrites to axons; constitutively active RAB17 promotes dendritic GluK2 surface expression by enhancing Syntaxin-4 translocation to dendrites, indicating RAB17 selectively regulates KAR surface expression by mediating dendritic trafficking of Syntaxin-4.","method":"shRNA knockdown, surface biotinylation, immunofluorescence, overexpression of constitutively active RAB17 in rat hippocampal neurons","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (KD, OE, surface biotinylation), mechanistic pathway placement, single lab","pmids":["24895134"],"is_preprint":false},{"year":2014,"finding":"RAB17-mediated recycling endosomes supply membrane to Group A Streptococcus-containing autophagosome-like vacuoles (GcAVs); dominant-negative RAB17 (N132I) reduces GcAV formation efficiency, while RAB17 overexpression increases TfR-positive GcAV content; knockdown of upstream activator Rabex-5 similarly reduces GcAV formation, establishing RAB17 as a mediator of recycling endosome-to-autophagosome membrane supply during antibacterial autophagy.","method":"Colocalization analysis, dominant-negative overexpression, siRNA knockdown, Rabex-5 knockdown in GAS-infected cells","journal":"Cellular microbiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — dominant-negative mutant plus siRNA epistasis with defined phenotypic readouts, single lab","pmids":["25052408"],"is_preprint":false},{"year":2016,"finding":"Mass spectrometry of efferosomes in macrophages showed that they lack antigen presentation proteins and instead recruit RAB17; RAB17-dependent sorting diverts efferocytosed cargo away from the MHC class II loading compartment via the recycling endosome pathway, preventing presentation of apoptotic cell-derived antigens.","method":"Mass spectrometry, immunofluorescence microscopy of efferosomes vs phagosomes, functional antigen presentation assays in macrophages","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proteomics plus imaging with functional readout, single lab, multiple methods","pmids":["28005073"],"is_preprint":false},{"year":2016,"finding":"RAB17 undergoes monosumoylation (shifting from 25 kDa to 40 kDa), and prenylation is required for sumoylation; the GTP-bound, sumoylated form of RAB17 selectively binds Syntaxin-2 (but not Syntaxins 3 or 4) in polarized hepatic WIF-B cells; a sumoylation-deficient K68R mutant redistributes Syntaxin-2 and 5'-nucleotidase from the apical membrane to subapical puncta, indicating sumoylation-dependent interactions with Syntaxin-2 mediate apical vesicle fusion.","method":"Recombinant adenovirus expression, immunoblotting, co-immunoprecipitation, mutant analysis (K68R, GTP/GDP-bound forms) in polarized WIF-B cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — biochemical reconstitution of sumoylation, mutagenesis (K68R), nucleotide-dependent binding assay, multiple orthogonal methods, single lab","pmids":["26957544"],"is_preprint":false},{"year":2017,"finding":"RAB17 is rapidly recruited to efferosomes after apoptotic cell uptake; efferosomes migrate to the cell center where they undergo RAB17-dependent vesiculation, and resulting vesicles traffic in a RAB17-dependent manner to the cell periphery, transferring cargo to recycling endosomes to prevent further phagolysosome maturation.","method":"Live-cell imaging, immunofluorescence microscopy, RAB17 functional perturbation in macrophages","journal":"Small GTPases","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live imaging plus functional perturbation, mechanistic pathway model supported, single lab","pmids":["28471261"],"is_preprint":false},{"year":2018,"finding":"RAB17 regulates basolateral-to-apical transcytotic vesicle docking and fusion at the apical surface in polarized hepatic WIF-B cells; GTP-bound and sumoylated RAB17 are required for apical vesicle docking; GTP hydrolysis is required for vesicle delivery; transcytosis is impaired at the subapical compartment-to-apical surface step; this function applies broadly to three classes of newly synthesized apical residents.","method":"Exogenous expression of wild-type, dominant active, dominant negative, and sumoylation-deficient RAB17 in polarized WIF-B hepatocytes; transcytosis assays; immunofluorescence","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple GTPase mutants plus sumoylation mutant with defined biochemical transport assays, mechanistic dissection of docking vs. fusion step, single lab with multiple orthogonal approaches","pmids":["30256711"],"is_preprint":false},{"year":2019,"finding":"Influenza A virus HA and NA colocalize with RAB17-positive compartments after synthesis; dominant-negative RAB17 significantly delays HA transport to the plasma membrane; HA associates with RAB17 in lipid raft fractions by co-immunoprecipitation; cholesterol depletion by methyl-β-cyclodextrin abolishes RAB17-associated NA movement, indicating RAB17 mediates cholesterol/lipid raft-dependent apical transport of viral envelope proteins.","method":"Confocal microscopy in stable AcGFP-Rab cell lines, dominant-negative RAB17 expression, co-immunoprecipitation from lipid raft fractions, methyl-β-cyclodextrin treatment, live-cell imaging","journal":"Frontiers in microbiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — DN mutant, co-IP, pharmacological perturbation, and live imaging, single lab","pmids":["31456775"],"is_preprint":false},{"year":2020,"finding":"ALS2 interacts physically with RAB17 but lacks GEF activity for RAB17 (RABGEF1/Rabex-5 is the actual Rab17-GEF); ALS2 acts downstream of RABGEF1 and regulates maturation of Rab17-residing nascent endosomes to EEA1-positive early endosomes; upon Rac1 activation, RAB17 and ALS2 are co-recruited to membrane ruffles and early endosomes in a Rab5-activity-independent manner; RAB17 localization to recycling endosomes depends on RAB11 expression.","method":"Co-immunoprecipitation, GEF activity assays, shRNA knockdown, Rac1 activation, immunofluorescence in cell lines","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical GEF assay (negative for ALS2), co-IP, knockdown epistasis, single lab with multiple methods","pmids":["31959474"],"is_preprint":false},{"year":2024,"finding":"RAB17 attenuates ferroptosis in endometrial cancer cells by inhibiting transferrin receptor (TFRC) protein expression through a ubiquitin proteasome-dependent mechanism; RAB17 expression is increased under low-glucose conditions and limits ferroptosis to promote cancer cell survival via the RAB17-TFRC axis.","method":"RAB17 overexpression/knockdown, western blot for TFRC, proteasome inhibitor assays, in vitro and in vivo xenograft models","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanism defined by proteasome inhibitor experiments plus in vitro/in vivo validation, single lab","pmids":["39242574"],"is_preprint":false},{"year":2025,"finding":"LMO4 promotes ubiquitin-proteasome-dependent degradation of RAB17 in oral squamous cell carcinoma cells; restoration of RAB17 expression reduces proliferation, migration, and ferroptosis resistance conferred by LMO4, identifying LMO4 as an upstream E3 ligase-recruiting factor that negatively regulates RAB17 protein levels post-translationally.","method":"LMO4 overexpression/knockdown, RAB17 rescue expression, western blot, proteasome inhibitor assays, xenograft mouse model","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proteasome inhibitor rescue plus epistasis rescue experiments, single lab","pmids":["41213908"],"is_preprint":false},{"year":2025,"finding":"RAB17 expression in hepatoma-derived Clone 9 cells induces actin- and cholesterol-dependent lateral membrane protrusions in a GTP-dependent manner; RAB17 selectively redistributes invadopodia proteins to protrusion tips and reduces matrix degradation; RAB17 interacts with MAL2 in a GTP-dependent manner; RAB17 redirects newly synthesized membrane proteins from the Golgi to induced protrusions in a GTP-dependent manner.","method":"Exogenous expression of wild-type and GTPase mutants, co-immunoprecipitation, actin/cholesterol depletion, matrix degradation assays, live trafficking assays in Clone 9 cells","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple mutants, co-IP, pharmacological perturbation, functional matrix assay, single lab","pmids":["39813085"],"is_preprint":false}],"current_model":"RAB17 is an epithelial cell-specific small GTPase that localizes to recycling endosomes and regulates basolateral-to-apical transcytosis (via GTP hydrolysis and sumoylation-dependent binding to Syntaxin-2), dendrite-specific membrane trafficking in neurons (including dendritic targeting of Syntaxin-4 to control kainate receptor surface expression), melanosome trafficking and filopodia formation in melanocytes, and efferocytic cargo sorting away from MHC class II compartments in macrophages; its activity is controlled by the GEF Rabex-5/RABGEF1, modulated by ALS2-dependent endosomal maturation, and post-translationally regulated by monosumoylation and ubiquitin-proteasome-dependent degradation (promoted by LMO4), while its transcriptional suppression by ERK2 promotes cancer cell invasion."},"narrative":{"mechanistic_narrative":"RAB17 is an epithelial cell-specific small GTPase that controls polarized membrane trafficking through the apical recycling endosome, coupling cargo sorting to delivery at specialized membrane domains across multiple cell types [PMID:8486736, PMID:9490718]. In polarized epithelia and hepatocytes it associates with the apical recycling endosome and regulates basolateral-to-apical transcytosis: GTP-binding and GTP-hydrolysis mutants alter transcytosis of transferrin receptor, FcLR chimeras, and dimeric IgA carried by the polymeric immunoglobulin receptor, and RAB17 acts at the subapical-compartment-to-apical-surface docking and fusion step [PMID:9490718, PMID:9624171, PMID:30256711]. Its activity at this step is gated by post-translational modification: prenylation-dependent monosumoylation of GTP-bound RAB17 drives selective binding to Syntaxin-2 (but not Syntaxins 3 or 4), and a sumoylation-deficient K68R mutant mislocalizes Syntaxin-2 and apical residents, defining a sumoylation-dependent vesicle docking mechanism with GTP hydrolysis required for the subsequent fusion/delivery step [PMID:26957544, PMID:30256711]. The same recycling-endosome machinery is redeployed in other contexts: RAB17 directs melanosome trafficking and filopodia formation downstream of RAB27a in melanocytes [PMID:21291502], mediates dendrite-specific membrane trafficking in hippocampal neurons—including dendritic targeting of Syntaxin-4 to control kainate receptor (GluK2) surface expression and dendrite/spine development [PMID:22291024, PMID:24895134]—and supplies recycling-endosome membrane to autophagosome-like vacuoles during antibacterial autophagy [PMID:25052408]. In macrophages, RAB17 is recruited to efferosomes and sorts efferocytosed cargo away from the MHC class II loading compartment, preventing presentation of apoptotic-cell antigens [PMID:28005073, PMID:28471261]. RAB17 activity is controlled upstream by the GEF Rabex-5/RABGEF1, which also drives its translocation to dendrites, with ALS2 acting downstream of RABGEF1 to regulate maturation of RAB17-residing nascent endosomes and RAB11 required for recycling-endosome localization [PMID:23430262, PMID:31959474]. RAB17 is additionally regulated at the protein level by ubiquitin-proteasome-dependent degradation promoted by LMO4, and its transcription is suppressed by ERK2; loss of RAB17 promotes invasive migration and, via proteasome-dependent suppression of transferrin receptor (TFRC), attenuates ferroptosis to support cancer cell survival [PMID:22328529, PMID:39242574, PMID:41213908].","teleology":[{"year":1993,"claim":"Established RAB17 as an epithelial-restricted GTPase whose expression and basolateral/apical-tubule localization implicated it in transcellular transport, defining the cell type and compartment in which to look for function.","evidence":"Northern blot, in situ hybridization, and immunoelectron microscopy on differentiating mouse kidney","pmids":["8486736"],"confidence":"Medium","gaps":["No direct transport assay","GTPase cycle and effectors unidentified"]},{"year":1998,"claim":"Defined RAB17 as a functional regulator of the apical recycling endosome by showing GTPase-cycle mutants and overexpression bidirectionally alter basolateral-to-apical transcytosis and apical recycling of model cargoes.","evidence":"GTPase mutant expression, transcytosis and recycling assays, and confocal colocalization in polarized Eph4 and MDCK cells with IgA/pIgR","pmids":["9490718","9624171"],"confidence":"High","gaps":["Effectors mediating docking/fusion not identified","Step within the pathway (sorting vs docking vs fusion) not yet resolved"]},{"year":1999,"claim":"Confirmed the epithelial transcytosis role in vivo by localizing RAB17 with IgA in basolateral endosomes of intestinal enterocytes.","evidence":"Immunogold electron microscopy on mouse small intestinal explants","pmids":["10029620"],"confidence":"Medium","gaps":["Correlative localization only, no in vivo perturbation"]},{"year":2011,"claim":"Extended RAB17 function beyond transcytosis by placing it downstream of RAB27a in melanosome release and filopodia formation, indicating a conserved recycling-endosome role in peripheral cargo delivery.","evidence":"GFP-RAB17 imaging, siRNA single/double knockdown with RAB27a, melanin and filopodia quantification in melanoma cells","pmids":["21291502"],"confidence":"Medium","gaps":["Molecular link to RAB27a pathway not defined","Effectors in melanocytes unknown"]},{"year":2012,"claim":"Revealed a neuronal role: RAB17 is dendrite-restricted and required for dendrite growth, branching, and spine formation, generalizing its trafficking function to polarized membrane delivery in neurons.","evidence":"shRNA knockdown, immunofluorescence, and morphometry in mouse hippocampal neurons","pmids":["22291024"],"confidence":"Medium","gaps":["Cargoes delivered to dendrites not yet identified","Upstream activation unknown"]},{"year":2012,"claim":"Positioned RAB17 as a transcriptionally controlled brake on invasion, showing ERK2 suppresses RAB17 expression and RAB17 loss restores invasive migration.","evidence":"ERK2 and RAB17 siRNA knockdown, gene expression arrays, and 3D invasion assays in MDA-MB-231 cells","pmids":["22328529"],"confidence":"Medium","gaps":["Trafficking mechanism linking RAB17 to invasion not defined","Direct vs indirect ERK2 regulation unresolved"]},{"year":2013,"claim":"Identified Rabex-5/RABGEF1 as the upstream GEF for RAB17 and showed it drives RAB17 translocation to dendrites, providing the activation step for dendritogenesis.","evidence":"Yeast two-hybrid with GDP-locked RAB17, shRNA knockdown, and live imaging in mouse hippocampal neurons","pmids":["23430262"],"confidence":"Medium","gaps":["Direct GEF catalysis not biochemically reconstituted in this study","GAP for RAB17 unknown"]},{"year":2014,"claim":"Defined a molecular cargo mechanism in neurons: RAB17 traffics Syntaxin-4 to dendrites to selectively control kainate (GluK2) but not AMPA receptor surface expression.","evidence":"shRNA knockdown, constitutively active RAB17 overexpression, surface biotinylation, and colocalization in rat hippocampal neurons","pmids":["24895134"],"confidence":"Medium","gaps":["Whether RAB17-Syntaxin-4 interaction is direct not shown","Selectivity basis for KAR vs AMPA cargo unclear"]},{"year":2014,"claim":"Demonstrated RAB17 supplies recycling-endosome membrane to autophagosome-like vacuoles during antibacterial autophagy, linking RAB17 trafficking to host defense.","evidence":"Dominant-negative and overexpression, siRNA and Rabex-5 knockdown in GAS-infected cells","pmids":["25052408"],"confidence":"Medium","gaps":["Effectors at the autophagosome not identified","Generalizability to other pathogens untested"]},{"year":2016,"claim":"Established RAB17 as an immune cargo-sorting factor that diverts efferocytosed material away from the MHC class II compartment via recycling endosomes, preventing apoptotic-cell antigen presentation.","evidence":"Efferosome mass spectrometry, imaging versus phagosomes, and antigen presentation assays in macrophages","pmids":["28005073"],"confidence":"Medium","gaps":["Sorting signal on cargo not defined","Effectors mediating diversion unknown"]},{"year":2016,"claim":"Uncovered the post-translational switch controlling RAB17 docking: prenylation-dependent monosumoylation of GTP-bound RAB17 confers selective Syntaxin-2 binding required for correct apical residence of cargo.","evidence":"Sumoylation immunoblotting, co-IP, and K68R/nucleotide-state mutant analysis in polarized WIF-B hepatocytes","pmids":["26957544"],"confidence":"High","gaps":["SUMO E3 ligase and desumoylase not identified","Whether sumoylation cycles with the GTPase cycle unresolved"]},{"year":2018,"claim":"Dissected the transport step, showing GTP-bound sumoylated RAB17 mediates apical vesicle docking while GTP hydrolysis drives delivery, generalizing across three classes of apical residents.","evidence":"Wild-type, dominant-active, dominant-negative, and sumoylation-deficient RAB17 with transcytosis assays in polarized WIF-B hepatocytes","pmids":["30256711"],"confidence":"High","gaps":["Identity of the GAP triggering hydrolysis unknown","Tethering complex bridging vesicle and membrane not defined"]},{"year":2019,"claim":"Showed RAB17 mediates cholesterol/lipid-raft-dependent apical transport of influenza envelope proteins, indicating the apical pathway is hijacked by viruses.","evidence":"Confocal imaging, dominant-negative RAB17, lipid-raft co-IP, and methyl-β-cyclodextrin treatment in stable cell lines","pmids":["31456775"],"confidence":"Medium","gaps":["Whether HA/NA bind RAB17 directly or via raft scaffolds unresolved","Role in viral assembly versus surface delivery not separated"]},{"year":2020,"claim":"Clarified the upstream regulatory hierarchy: RABGEF1 (not ALS2) is the RAB17 GEF, ALS2 acts downstream to mature RAB17 endosomes to EEA1-positive early endosomes, and RAB11 is needed for recycling-endosome localization, with Rac1-driven co-recruitment to ruffles.","evidence":"Co-IP, GEF activity assays, shRNA knockdown, and Rac1 activation with immunofluorescence","pmids":["31959474"],"confidence":"Medium","gaps":["Mechanism of ALS2-dependent maturation not detailed","How RAB11 controls RAB17 targeting unresolved"]},{"year":2024,"claim":"Linked RAB17 to cancer metabolism by showing it attenuates ferroptosis through proteasome-dependent suppression of transferrin receptor (TFRC), promoting survival under low glucose.","evidence":"RAB17 overexpression/knockdown, TFRC western blot, proteasome inhibitor assays, and xenografts in endometrial cancer cells","pmids":["39242574"],"confidence":"Medium","gaps":["How RAB17 routes TFRC to degradation mechanistically unclear","Whether classical trafficking activity underlies this effect untested"]},{"year":2025,"claim":"Identified LMO4 as a post-translational negative regulator that promotes ubiquitin-proteasome degradation of RAB17, controlling proliferation, migration, and ferroptosis resistance in oral squamous cell carcinoma.","evidence":"LMO4 overexpression/knockdown, RAB17 rescue, proteasome inhibitor assays, and xenografts","pmids":["41213908"],"confidence":"Medium","gaps":["Direct E3 ligase recruited by LMO4 not identified","Ubiquitination sites on RAB17 unmapped"]},{"year":2025,"claim":"Demonstrated RAB17 can drive formation of actin/cholesterol-dependent membrane protrusions, redirect Golgi-derived cargo and invadopodia proteins, and reduce matrix degradation, via GTP-dependent interaction with MAL2.","evidence":"Wild-type/mutant expression, co-IP, actin/cholesterol depletion, matrix degradation, and trafficking assays in Clone 9 cells","pmids":["39813085"],"confidence":"Medium","gaps":["Whether MAL2 is the physiological effector in other cell types untested","Relationship between protrusion role and transcytosis role unclear"]},{"year":null,"claim":"The GAP that terminates RAB17 signaling, the SUMO ligase/desumoylase acting on K68, and the full tethering machinery linking RAB17-Syntaxin-2 docking to membrane fusion remain unidentified.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No RAB17 GAP identified","SUMO E3 ligase/desumoylase for RAB17 unknown","Structure of RAB17 effector complexes undetermined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003924","term_label":"GTPase activity","supporting_discovery_ids":[1,2,11,13,18]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[11,13]}],"localization":[{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[1,2,4,15]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,3,13]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[2,3,12]}],"pathway":[{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[1,2,13]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[1,2,13,18]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[10,12]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[9]}],"complexes":[],"partners":["STX2","STX4","RABGEF1","ALS2","RAB11","MAL2","LMO4"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9H0T7","full_name":"Ras-related protein Rab-17","aliases":[],"length_aa":212,"mass_kda":23.5,"function":"The small GTPases Rab are key regulators of intracellular membrane trafficking, from the formation of transport vesicles to their fusion with membranes. Rabs cycle between an inactive GDP-bound form and an active GTP-bound form that is able to recruit to membranes different set of downstream effectors directly responsible for vesicle formation, movement, tethering and fusion (By similarity). RAB17 is involved in transcytosis, the directed movement of endocytosed material through the cell and its exocytosis from the plasma membrane at the opposite side. Mainly observed in epithelial cells, transcytosis mediates for instance, the transcellular transport of immunoglobulins from the basolateral surface to the apical surface. Most probably controls membrane trafficking through apical recycling endosomes in a post-endocytic step of transcytosis. Required for melanosome transport and release from melanocytes, it also regulates dendrite and dendritic spine development (By similarity). May also play a role in cell migration (PubMed:22328529)","subcellular_location":"Recycling endosome membrane; Melanosome; Cell projection, dendrite","url":"https://www.uniprot.org/uniprotkb/Q9H0T7/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RAB17","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":[],"url":"https://opencell.sf.czbiohub.org/search/RAB17","total_profiled":1310},"omim":[{"mim_id":"602207","title":"RAS-ASSOCIATED PROTEIN RAB18; RAB18","url":"https://www.omim.org/entry/602207"},{"mim_id":"602206","title":"RAS-ASSOCIATED PROTEIN RAB17; RAB17","url":"https://www.omim.org/entry/602206"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Vesicles","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"choroid plexus","ntpm":72.0},{"tissue":"intestine","ntpm":72.1},{"tissue":"kidney","ntpm":77.4},{"tissue":"liver","ntpm":123.1}],"url":"https://www.proteinatlas.org/search/RAB17"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"Q9H0T7","domains":[{"cath_id":"3.40.50.300","chopping":"17-167","consensus_level":"medium","plddt":93.3538,"start":17,"end":167}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9H0T7","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9H0T7-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9H0T7-F1-predicted_aligned_error_v6.png","plddt_mean":85.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RAB17","jax_strain_url":"https://www.jax.org/strain/search?query=RAB17"},"sequence":{"accession":"Q9H0T7","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9H0T7.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9H0T7/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9H0T7"}},"corpus_meta":[{"pmid":"12061899","id":"PMC_12061899","title":"Maize DRE-binding proteins DBF1 and DBF2 are involved in rab17 regulation through the drought-responsive element in an ABA-dependent pathway.","date":"2002","source":"The Plant journal : for cell and molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/12061899","citation_count":150,"is_preprint":false},{"pmid":"8180497","id":"PMC_8180497","title":"The maize abscisic acid-responsive protein Rab17 is located in the nucleus and interacts with nuclear localization signals.","date":"1994","source":"The Plant cell","url":"https://pubmed.ncbi.nlm.nih.gov/8180497","citation_count":137,"is_preprint":false},{"pmid":"8486736","id":"PMC_8486736","title":"Rab17, a novel small GTPase, is specific for epithelial cells and is induced during cell polarization.","date":"1993","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/8486736","citation_count":129,"is_preprint":false},{"pmid":"9490718","id":"PMC_9490718","title":"Rab17 regulates membrane trafficking through apical 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microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/25052408","citation_count":35,"is_preprint":false},{"pmid":"33380810","id":"PMC_33380810","title":"Knockdown of Circular RNA Hsa_circ_0000714 Can Regulate RAB17 by Sponging miR-370-3p to Reduce Paclitaxel Resistance of Ovarian Cancer Through CDK6/RB Pathway.","date":"2020","source":"OncoTargets and therapy","url":"https://pubmed.ncbi.nlm.nih.gov/33380810","citation_count":31,"is_preprint":false},{"pmid":"31841274","id":"PMC_31841274","title":"Downregulation of Rab17 promotes cell proliferation and invasion in non-small cell lung cancer through STAT3/HIF-1α/VEGF signaling.","date":"2019","source":"Thoracic cancer","url":"https://pubmed.ncbi.nlm.nih.gov/31841274","citation_count":26,"is_preprint":false},{"pmid":"25707355","id":"PMC_25707355","title":"Rab17 inhibits the tumourigenic properties of hepatocellular carcinomas via the Erk pathway.","date":"2015","source":"Tumour biology : the journal of the International Society for 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Weight GTPase Selectively Binds Syntaxin 2 in Polarized Hepatic WIF-B Cells.","date":"2016","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/26957544","citation_count":12,"is_preprint":false},{"pmid":"39242574","id":"PMC_39242574","title":"RAB17 promotes endometrial cancer progression by inhibiting TFRC-dependent ferroptosis.","date":"2024","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/39242574","citation_count":11,"is_preprint":false},{"pmid":"30256711","id":"PMC_30256711","title":"Rab17 regulates apical delivery of hepatic transcytotic vesicles.","date":"2018","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/30256711","citation_count":10,"is_preprint":false},{"pmid":"31959474","id":"PMC_31959474","title":"ALS2, the small GTPase Rab17-interacting protein, regulates maturation and sorting of Rab17-associated endosomes.","date":"2020","source":"Biochemical and biophysical research 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kidney sections\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization by immunoelectron microscopy with functional inference, single lab, two orthogonal methods\",\n      \"pmids\": [\"8486736\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"RAB17 associates with the apical recycling endosome in polarized Eph4 epithelial cells and with the perinuclear recycling endosome in non-polarized BHK-21 cells; dominant-negative (GTP-binding deficient) and constitutively active (hydrolysis-deficient) RAB17 mutants specifically increased basolateral-to-apical transcytosis of transferrin receptor and FcLR chimeric receptor, and stimulated apical recycling, establishing RAB17 as a regulator of traffic through the apical recycling endosome.\",\n      \"method\": \"Confocal immunofluorescence microscopy, expression of GTPase mutants, transcytosis assays in polarized Eph4 cells\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal functional assays with GTPase mutants and direct colocalization, multiple orthogonal methods, replicated in two cell systems\",\n      \"pmids\": [\"9490718\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"RAB17 localizes to small vesicles and tubules in the apical region of MDCK cells, colocalizes with dimeric IgA internalized via the polymeric immunoglobulin receptor (pIgR) from both apical and basolateral surfaces, and overexpression of RAB17 impairs basolateral-to-apical transcytosis of dimeric IgA, providing morphological and functional evidence for RAB17 in regulating transcellular traffic through apical recycling endosomes.\",\n      \"method\": \"Stable MDCK cell lines expressing wild-type or mutant RAB17 and pIgR, immunofluorescence/electron microscopy, IgA transcytosis assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function and gain-of-function with defined biochemical phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"9624171\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"RAB17 colocalizes with IgA along the basolateral plasma membrane and in basolateral endosomes/vesicles of mouse enterocytes, supporting its involvement in IgA transcytosis through raft-containing compartments in vivo.\",\n      \"method\": \"Immunogold electron microscopy on mouse small intestinal explants\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct colocalization by immunoelectron microscopy, single lab, single method\",\n      \"pmids\": [\"10029620\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"RAB17 localizes to recycling endosomes and melanosomes in melanocytic cells; siRNA knockdown of RAB17 causes accumulation of melanosomes at the cell periphery and increased melanin retention inside cells, inhibits filopodia formation, and acts downstream of RAB27a in the melanosome release pathway.\",\n      \"method\": \"GFP-RAB17 live imaging, siRNA knockdown, double knockdown with RAB27a, melanin quantification, filopodia counting in melanoma cells\",\n      \"journal\": \"Traffic\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown with defined cellular phenotypes, epistasis with RAB27a, two orthogonal readouts, single lab\",\n      \"pmids\": [\"21291502\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"RAB17 localizes specifically to dendritic growth cones, shafts, filopodia, and mature spines (but not axons) in mouse hippocampal neurons; shRNA-mediated knockdown reduces dendrite growth, branching, and dendritic spine number, identifying RAB17 as a regulator of dendrite-specific membrane trafficking and postsynaptic development.\",\n      \"method\": \"shRNA knockdown, immunofluorescence, morphometric analysis in mouse hippocampal neurons\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — shRNA knockdown with multiple defined morphological phenotypes, compartment-specific localization, single lab\",\n      \"pmids\": [\"22291024\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"ERK2 (but not ERK1) suppresses RAB17 gene expression, and knockdown of RAB17 restores invasive migration in ERK2-depleted MDA-MB-231 cancer cells, placing RAB17 downstream of ERK2 as an inhibitor of invasive migration in 3D matrices.\",\n      \"method\": \"ERK2 siRNA knockdown, gene expression arrays, RAB17 siRNA knockdown in ERK2-depleted cells, 3D invasion assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis by double knockdown, gene array plus functional validation, single lab\",\n      \"pmids\": [\"22328529\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Rabex-5 (a Rab5-GEF) interacts with a GDP-locked RAB17 mutant and promotes translocation of RAB17 from the cell body to the dendrites of developing mouse hippocampal neurons; shRNA knockdown of Rabex-5 inhibits both axon and dendrite morphogenesis, while RAB17 knockdown affects dendrite morphogenesis alone, indicating Rabex-5 acts upstream of RAB17 as its GEF to regulate dendritogenesis.\",\n      \"method\": \"Yeast two-hybrid screen with GDP-locked RAB17 as bait, shRNA knockdown, live-cell fluorescence imaging in mouse hippocampal neurons\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid plus shRNA epistasis with distinct phenotypic readouts, single lab\",\n      \"pmids\": [\"23430262\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"RAB17 knockdown reduces surface expression of the kainate receptor subunit GluK2, but not AMPA receptor subunit GluA1; RAB17 colocalizes with Syntaxin-4 in dendrites, and RAB17 knockdown causes Syntaxin-4 redistribution from dendrites to axons; constitutively active RAB17 promotes dendritic GluK2 surface expression by enhancing Syntaxin-4 translocation to dendrites, indicating RAB17 selectively regulates KAR surface expression by mediating dendritic trafficking of Syntaxin-4.\",\n      \"method\": \"shRNA knockdown, surface biotinylation, immunofluorescence, overexpression of constitutively active RAB17 in rat hippocampal neurons\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (KD, OE, surface biotinylation), mechanistic pathway placement, single lab\",\n      \"pmids\": [\"24895134\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"RAB17-mediated recycling endosomes supply membrane to Group A Streptococcus-containing autophagosome-like vacuoles (GcAVs); dominant-negative RAB17 (N132I) reduces GcAV formation efficiency, while RAB17 overexpression increases TfR-positive GcAV content; knockdown of upstream activator Rabex-5 similarly reduces GcAV formation, establishing RAB17 as a mediator of recycling endosome-to-autophagosome membrane supply during antibacterial autophagy.\",\n      \"method\": \"Colocalization analysis, dominant-negative overexpression, siRNA knockdown, Rabex-5 knockdown in GAS-infected cells\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — dominant-negative mutant plus siRNA epistasis with defined phenotypic readouts, single lab\",\n      \"pmids\": [\"25052408\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Mass spectrometry of efferosomes in macrophages showed that they lack antigen presentation proteins and instead recruit RAB17; RAB17-dependent sorting diverts efferocytosed cargo away from the MHC class II loading compartment via the recycling endosome pathway, preventing presentation of apoptotic cell-derived antigens.\",\n      \"method\": \"Mass spectrometry, immunofluorescence microscopy of efferosomes vs phagosomes, functional antigen presentation assays in macrophages\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proteomics plus imaging with functional readout, single lab, multiple methods\",\n      \"pmids\": [\"28005073\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"RAB17 undergoes monosumoylation (shifting from 25 kDa to 40 kDa), and prenylation is required for sumoylation; the GTP-bound, sumoylated form of RAB17 selectively binds Syntaxin-2 (but not Syntaxins 3 or 4) in polarized hepatic WIF-B cells; a sumoylation-deficient K68R mutant redistributes Syntaxin-2 and 5'-nucleotidase from the apical membrane to subapical puncta, indicating sumoylation-dependent interactions with Syntaxin-2 mediate apical vesicle fusion.\",\n      \"method\": \"Recombinant adenovirus expression, immunoblotting, co-immunoprecipitation, mutant analysis (K68R, GTP/GDP-bound forms) in polarized WIF-B cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — biochemical reconstitution of sumoylation, mutagenesis (K68R), nucleotide-dependent binding assay, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"26957544\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RAB17 is rapidly recruited to efferosomes after apoptotic cell uptake; efferosomes migrate to the cell center where they undergo RAB17-dependent vesiculation, and resulting vesicles traffic in a RAB17-dependent manner to the cell periphery, transferring cargo to recycling endosomes to prevent further phagolysosome maturation.\",\n      \"method\": \"Live-cell imaging, immunofluorescence microscopy, RAB17 functional perturbation in macrophages\",\n      \"journal\": \"Small GTPases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live imaging plus functional perturbation, mechanistic pathway model supported, single lab\",\n      \"pmids\": [\"28471261\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"RAB17 regulates basolateral-to-apical transcytotic vesicle docking and fusion at the apical surface in polarized hepatic WIF-B cells; GTP-bound and sumoylated RAB17 are required for apical vesicle docking; GTP hydrolysis is required for vesicle delivery; transcytosis is impaired at the subapical compartment-to-apical surface step; this function applies broadly to three classes of newly synthesized apical residents.\",\n      \"method\": \"Exogenous expression of wild-type, dominant active, dominant negative, and sumoylation-deficient RAB17 in polarized WIF-B hepatocytes; transcytosis assays; immunofluorescence\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple GTPase mutants plus sumoylation mutant with defined biochemical transport assays, mechanistic dissection of docking vs. fusion step, single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"30256711\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Influenza A virus HA and NA colocalize with RAB17-positive compartments after synthesis; dominant-negative RAB17 significantly delays HA transport to the plasma membrane; HA associates with RAB17 in lipid raft fractions by co-immunoprecipitation; cholesterol depletion by methyl-β-cyclodextrin abolishes RAB17-associated NA movement, indicating RAB17 mediates cholesterol/lipid raft-dependent apical transport of viral envelope proteins.\",\n      \"method\": \"Confocal microscopy in stable AcGFP-Rab cell lines, dominant-negative RAB17 expression, co-immunoprecipitation from lipid raft fractions, methyl-β-cyclodextrin treatment, live-cell imaging\",\n      \"journal\": \"Frontiers in microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — DN mutant, co-IP, pharmacological perturbation, and live imaging, single lab\",\n      \"pmids\": [\"31456775\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ALS2 interacts physically with RAB17 but lacks GEF activity for RAB17 (RABGEF1/Rabex-5 is the actual Rab17-GEF); ALS2 acts downstream of RABGEF1 and regulates maturation of Rab17-residing nascent endosomes to EEA1-positive early endosomes; upon Rac1 activation, RAB17 and ALS2 are co-recruited to membrane ruffles and early endosomes in a Rab5-activity-independent manner; RAB17 localization to recycling endosomes depends on RAB11 expression.\",\n      \"method\": \"Co-immunoprecipitation, GEF activity assays, shRNA knockdown, Rac1 activation, immunofluorescence in cell lines\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical GEF assay (negative for ALS2), co-IP, knockdown epistasis, single lab with multiple methods\",\n      \"pmids\": [\"31959474\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"RAB17 attenuates ferroptosis in endometrial cancer cells by inhibiting transferrin receptor (TFRC) protein expression through a ubiquitin proteasome-dependent mechanism; RAB17 expression is increased under low-glucose conditions and limits ferroptosis to promote cancer cell survival via the RAB17-TFRC axis.\",\n      \"method\": \"RAB17 overexpression/knockdown, western blot for TFRC, proteasome inhibitor assays, in vitro and in vivo xenograft models\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanism defined by proteasome inhibitor experiments plus in vitro/in vivo validation, single lab\",\n      \"pmids\": [\"39242574\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"LMO4 promotes ubiquitin-proteasome-dependent degradation of RAB17 in oral squamous cell carcinoma cells; restoration of RAB17 expression reduces proliferation, migration, and ferroptosis resistance conferred by LMO4, identifying LMO4 as an upstream E3 ligase-recruiting factor that negatively regulates RAB17 protein levels post-translationally.\",\n      \"method\": \"LMO4 overexpression/knockdown, RAB17 rescue expression, western blot, proteasome inhibitor assays, xenograft mouse model\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proteasome inhibitor rescue plus epistasis rescue experiments, single lab\",\n      \"pmids\": [\"41213908\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"RAB17 expression in hepatoma-derived Clone 9 cells induces actin- and cholesterol-dependent lateral membrane protrusions in a GTP-dependent manner; RAB17 selectively redistributes invadopodia proteins to protrusion tips and reduces matrix degradation; RAB17 interacts with MAL2 in a GTP-dependent manner; RAB17 redirects newly synthesized membrane proteins from the Golgi to induced protrusions in a GTP-dependent manner.\",\n      \"method\": \"Exogenous expression of wild-type and GTPase mutants, co-immunoprecipitation, actin/cholesterol depletion, matrix degradation assays, live trafficking assays in Clone 9 cells\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple mutants, co-IP, pharmacological perturbation, functional matrix assay, single lab\",\n      \"pmids\": [\"39813085\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RAB17 is an epithelial cell-specific small GTPase that localizes to recycling endosomes and regulates basolateral-to-apical transcytosis (via GTP hydrolysis and sumoylation-dependent binding to Syntaxin-2), dendrite-specific membrane trafficking in neurons (including dendritic targeting of Syntaxin-4 to control kainate receptor surface expression), melanosome trafficking and filopodia formation in melanocytes, and efferocytic cargo sorting away from MHC class II compartments in macrophages; its activity is controlled by the GEF Rabex-5/RABGEF1, modulated by ALS2-dependent endosomal maturation, and post-translationally regulated by monosumoylation and ubiquitin-proteasome-dependent degradation (promoted by LMO4), while its transcriptional suppression by ERK2 promotes cancer cell invasion.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RAB17 is an epithelial cell-specific small GTPase that controls polarized membrane trafficking through the apical recycling endosome, coupling cargo sorting to delivery at specialized membrane domains across multiple cell types [#0, #1]. In polarized epithelia and hepatocytes it associates with the apical recycling endosome and regulates basolateral-to-apical transcytosis: GTP-binding and GTP-hydrolysis mutants alter transcytosis of transferrin receptor, FcLR chimeras, and dimeric IgA carried by the polymeric immunoglobulin receptor, and RAB17 acts at the subapical-compartment-to-apical-surface docking and fusion step [#1, #2, #13]. Its activity at this step is gated by post-translational modification: prenylation-dependent monosumoylation of GTP-bound RAB17 drives selective binding to Syntaxin-2 (but not Syntaxins 3 or 4), and a sumoylation-deficient K68R mutant mislocalizes Syntaxin-2 and apical residents, defining a sumoylation-dependent vesicle docking mechanism with GTP hydrolysis required for the subsequent fusion/delivery step [#11, #13]. The same recycling-endosome machinery is redeployed in other contexts: RAB17 directs melanosome trafficking and filopodia formation downstream of RAB27a in melanocytes [#4], mediates dendrite-specific membrane trafficking in hippocampal neurons—including dendritic targeting of Syntaxin-4 to control kainate receptor (GluK2) surface expression and dendrite/spine development [#5, #8]—and supplies recycling-endosome membrane to autophagosome-like vacuoles during antibacterial autophagy [#9]. In macrophages, RAB17 is recruited to efferosomes and sorts efferocytosed cargo away from the MHC class II loading compartment, preventing presentation of apoptotic-cell antigens [#10, #12]. RAB17 activity is controlled upstream by the GEF Rabex-5/RABGEF1, which also drives its translocation to dendrites, with ALS2 acting downstream of RABGEF1 to regulate maturation of RAB17-residing nascent endosomes and RAB11 required for recycling-endosome localization [#7, #15]. RAB17 is additionally regulated at the protein level by ubiquitin-proteasome-dependent degradation promoted by LMO4, and its transcription is suppressed by ERK2; loss of RAB17 promotes invasive migration and, via proteasome-dependent suppression of transferrin receptor (TFRC), attenuates ferroptosis to support cancer cell survival [#6, #16, #17].\",\n  \"teleology\": [\n    {\n      \"year\": 1993,\n      \"claim\": \"Established RAB17 as an epithelial-restricted GTPase whose expression and basolateral/apical-tubule localization implicated it in transcellular transport, defining the cell type and compartment in which to look for function.\",\n      \"evidence\": \"Northern blot, in situ hybridization, and immunoelectron microscopy on differentiating mouse kidney\",\n      \"pmids\": [\"8486736\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct transport assay\", \"GTPase cycle and effectors unidentified\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Defined RAB17 as a functional regulator of the apical recycling endosome by showing GTPase-cycle mutants and overexpression bidirectionally alter basolateral-to-apical transcytosis and apical recycling of model cargoes.\",\n      \"evidence\": \"GTPase mutant expression, transcytosis and recycling assays, and confocal colocalization in polarized Eph4 and MDCK cells with IgA/pIgR\",\n      \"pmids\": [\"9490718\", \"9624171\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Effectors mediating docking/fusion not identified\", \"Step within the pathway (sorting vs docking vs fusion) not yet resolved\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Confirmed the epithelial transcytosis role in vivo by localizing RAB17 with IgA in basolateral endosomes of intestinal enterocytes.\",\n      \"evidence\": \"Immunogold electron microscopy on mouse small intestinal explants\",\n      \"pmids\": [\"10029620\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Correlative localization only, no in vivo perturbation\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Extended RAB17 function beyond transcytosis by placing it downstream of RAB27a in melanosome release and filopodia formation, indicating a conserved recycling-endosome role in peripheral cargo delivery.\",\n      \"evidence\": \"GFP-RAB17 imaging, siRNA single/double knockdown with RAB27a, melanin and filopodia quantification in melanoma cells\",\n      \"pmids\": [\"21291502\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular link to RAB27a pathway not defined\", \"Effectors in melanocytes unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Revealed a neuronal role: RAB17 is dendrite-restricted and required for dendrite growth, branching, and spine formation, generalizing its trafficking function to polarized membrane delivery in neurons.\",\n      \"evidence\": \"shRNA knockdown, immunofluorescence, and morphometry in mouse hippocampal neurons\",\n      \"pmids\": [\"22291024\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cargoes delivered to dendrites not yet identified\", \"Upstream activation unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Positioned RAB17 as a transcriptionally controlled brake on invasion, showing ERK2 suppresses RAB17 expression and RAB17 loss restores invasive migration.\",\n      \"evidence\": \"ERK2 and RAB17 siRNA knockdown, gene expression arrays, and 3D invasion assays in MDA-MB-231 cells\",\n      \"pmids\": [\"22328529\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Trafficking mechanism linking RAB17 to invasion not defined\", \"Direct vs indirect ERK2 regulation unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identified Rabex-5/RABGEF1 as the upstream GEF for RAB17 and showed it drives RAB17 translocation to dendrites, providing the activation step for dendritogenesis.\",\n      \"evidence\": \"Yeast two-hybrid with GDP-locked RAB17, shRNA knockdown, and live imaging in mouse hippocampal neurons\",\n      \"pmids\": [\"23430262\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct GEF catalysis not biochemically reconstituted in this study\", \"GAP for RAB17 unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined a molecular cargo mechanism in neurons: RAB17 traffics Syntaxin-4 to dendrites to selectively control kainate (GluK2) but not AMPA receptor surface expression.\",\n      \"evidence\": \"shRNA knockdown, constitutively active RAB17 overexpression, surface biotinylation, and colocalization in rat hippocampal neurons\",\n      \"pmids\": [\"24895134\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether RAB17-Syntaxin-4 interaction is direct not shown\", \"Selectivity basis for KAR vs AMPA cargo unclear\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrated RAB17 supplies recycling-endosome membrane to autophagosome-like vacuoles during antibacterial autophagy, linking RAB17 trafficking to host defense.\",\n      \"evidence\": \"Dominant-negative and overexpression, siRNA and Rabex-5 knockdown in GAS-infected cells\",\n      \"pmids\": [\"25052408\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Effectors at the autophagosome not identified\", \"Generalizability to other pathogens untested\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Established RAB17 as an immune cargo-sorting factor that diverts efferocytosed material away from the MHC class II compartment via recycling endosomes, preventing apoptotic-cell antigen presentation.\",\n      \"evidence\": \"Efferosome mass spectrometry, imaging versus phagosomes, and antigen presentation assays in macrophages\",\n      \"pmids\": [\"28005073\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Sorting signal on cargo not defined\", \"Effectors mediating diversion unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Uncovered the post-translational switch controlling RAB17 docking: prenylation-dependent monosumoylation of GTP-bound RAB17 confers selective Syntaxin-2 binding required for correct apical residence of cargo.\",\n      \"evidence\": \"Sumoylation immunoblotting, co-IP, and K68R/nucleotide-state mutant analysis in polarized WIF-B hepatocytes\",\n      \"pmids\": [\"26957544\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"SUMO E3 ligase and desumoylase not identified\", \"Whether sumoylation cycles with the GTPase cycle unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Dissected the transport step, showing GTP-bound sumoylated RAB17 mediates apical vesicle docking while GTP hydrolysis drives delivery, generalizing across three classes of apical residents.\",\n      \"evidence\": \"Wild-type, dominant-active, dominant-negative, and sumoylation-deficient RAB17 with transcytosis assays in polarized WIF-B hepatocytes\",\n      \"pmids\": [\"30256711\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the GAP triggering hydrolysis unknown\", \"Tethering complex bridging vesicle and membrane not defined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showed RAB17 mediates cholesterol/lipid-raft-dependent apical transport of influenza envelope proteins, indicating the apical pathway is hijacked by viruses.\",\n      \"evidence\": \"Confocal imaging, dominant-negative RAB17, lipid-raft co-IP, and methyl-β-cyclodextrin treatment in stable cell lines\",\n      \"pmids\": [\"31456775\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether HA/NA bind RAB17 directly or via raft scaffolds unresolved\", \"Role in viral assembly versus surface delivery not separated\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Clarified the upstream regulatory hierarchy: RABGEF1 (not ALS2) is the RAB17 GEF, ALS2 acts downstream to mature RAB17 endosomes to EEA1-positive early endosomes, and RAB11 is needed for recycling-endosome localization, with Rac1-driven co-recruitment to ruffles.\",\n      \"evidence\": \"Co-IP, GEF activity assays, shRNA knockdown, and Rac1 activation with immunofluorescence\",\n      \"pmids\": [\"31959474\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of ALS2-dependent maturation not detailed\", \"How RAB11 controls RAB17 targeting unresolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Linked RAB17 to cancer metabolism by showing it attenuates ferroptosis through proteasome-dependent suppression of transferrin receptor (TFRC), promoting survival under low glucose.\",\n      \"evidence\": \"RAB17 overexpression/knockdown, TFRC western blot, proteasome inhibitor assays, and xenografts in endometrial cancer cells\",\n      \"pmids\": [\"39242574\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How RAB17 routes TFRC to degradation mechanistically unclear\", \"Whether classical trafficking activity underlies this effect untested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified LMO4 as a post-translational negative regulator that promotes ubiquitin-proteasome degradation of RAB17, controlling proliferation, migration, and ferroptosis resistance in oral squamous cell carcinoma.\",\n      \"evidence\": \"LMO4 overexpression/knockdown, RAB17 rescue, proteasome inhibitor assays, and xenografts\",\n      \"pmids\": [\"41213908\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct E3 ligase recruited by LMO4 not identified\", \"Ubiquitination sites on RAB17 unmapped\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstrated RAB17 can drive formation of actin/cholesterol-dependent membrane protrusions, redirect Golgi-derived cargo and invadopodia proteins, and reduce matrix degradation, via GTP-dependent interaction with MAL2.\",\n      \"evidence\": \"Wild-type/mutant expression, co-IP, actin/cholesterol depletion, matrix degradation, and trafficking assays in Clone 9 cells\",\n      \"pmids\": [\"39813085\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether MAL2 is the physiological effector in other cell types untested\", \"Relationship between protrusion role and transcytosis role unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The GAP that terminates RAB17 signaling, the SUMO ligase/desumoylase acting on K68, and the full tethering machinery linking RAB17-Syntaxin-2 docking to membrane fusion remain unidentified.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No RAB17 GAP identified\", \"SUMO E3 ligase/desumoylase for RAB17 unknown\", \"Structure of RAB17 effector complexes undetermined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003924\", \"supporting_discovery_ids\": [1, 2, 11, 13, 18]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [11, 13]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [1, 2, 4, 15]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 3, 13]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [2, 3, 12]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [1, 2, 13]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [1, 2, 13, 18]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [10, 12]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [9]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"STX2\", \"STX4\", \"RABGEF1\", \"ALS2\", \"RAB11\", \"MAL2\", \"LMO4\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}