{"gene":"RAB6B","run_date":"2026-04-28T19:45:45","timeline":{"discoveries":[{"year":2000,"finding":"RAB6B is a Rab6 subfamily member that localizes to the Golgi apparatus and ERGIC-53-positive vesicles. It displays lower GTP-binding activity compared to Rab6A, and in overexpression distributes over both Golgi and ER membranes. The GTP-bound form (Q72L mutant) interacts with all known Rab6A effectors including Rabkinesin-6, suggesting a role in retrograde membrane traffic at the Golgi complex.","method":"cDNA cloning, immunofluorescence, northern blot, GTP-binding assays, overexpression of constitutively active mutant, co-localization studies","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (biochemical assays, localization, mutagenesis) in foundational paper, 105 citations","pmids":["10893188"],"is_preprint":false},{"year":2006,"finding":"Crystal structures of human neuronal RAB6B solved in the inactive (MgGDP-bound) and active (MgGTPγS-bound) forms at 2.3 Å and 1.8 Å resolution, respectively. Conformational changes between states occur mainly in switch I and switch II regions, and an additional change is observed in the Rab6 subfamily-specific RabSF3 region, which may contribute to effector specificity.","method":"X-ray crystallography","journal":"Acta crystallographica. Section D, Biological crystallography","confidence":"High","confidence_rationale":"Tier 1 — high-resolution crystal structures of both nucleotide states with structural validation","pmids":["16790928"],"is_preprint":false},{"year":2007,"finding":"RAB6B interacts with Bicaudal-D1 (BICD1) in its GTP-bound (active) form, as shown by yeast two-hybrid, co-immunoprecipitation, and pull-down assays. RAB6B and BICD1 co-localize at the Golgi and along microtubule-aligned vesicles, and both co-localize with dynein in neurites of SK-N-SH neuronal cells. Live imaging showed bi-directional movement of EGFP-RAB6B structures in neurites, indicating RAB6B links to the dynein/dynactin complex via BICD1 to regulate retrograde transport in neuronal cells.","method":"Yeast two-hybrid, co-immunoprecipitation, pull-down assay, confocal microscopy, live-cell imaging","journal":"Experimental cell research","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP and multiple orthogonal methods with functional context in neuronal cells","pmids":["17707369"],"is_preprint":false},{"year":2008,"finding":"RAB6B interacts with the dynein light chain DYNLRB1, as demonstrated by yeast two-hybrid, co-immunoprecipitation, and pull-down studies. Unlike Rab6A which preferentially binds DYNLRB1 in the GTP-bound state, RAB6B (and Rab6A') associates preferentially with DYNLRB1 in the GDP-bound state. DYNLRB1 co-localizes with RAB6B isoforms at the Golgi apparatus.","method":"Yeast two-hybrid, co-immunoprecipitation, pull-down assay, co-localization by fluorescence microscopy","journal":"Cell motility and the cytoskeleton","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods demonstrating direct interaction with nucleotide-state preference","pmids":["18044744"],"is_preprint":false},{"year":2013,"finding":"RAB6B physically interacts with the outer mitochondrial membrane protein GDAP1 (mutated in Charcot-Marie-Tooth disease), placing RAB6B in a vesicle-organelle trafficking complex that may participate in mitochondrial movement within the cell.","method":"Co-immunoprecipitation/pull-down (interaction identified in GDAP1 silencing study)","journal":"Neurobiology of disease","confidence":"Medium","confidence_rationale":"Tier 3 — single pull-down/Co-IP identification of interaction without detailed mechanistic follow-up for RAB6B specifically","pmids":["23542510"],"is_preprint":false},{"year":2021,"finding":"RAB6B is expressed in primary mouse macrophages where it localizes to the Golgi complex. Knockdown of Rab6b reduced TNF secretion by M. bovis BCG-infected macrophages without affecting Tnf mRNA or intracellular TNF protein levels, indicating RAB6B promotes post-translational trafficking and secretion of TNF in macrophages.","method":"siRNA knockdown, ELISA, qRT-PCR, Western blot, immunofluorescence/confocal microscopy","journal":"Immunology and cell biology","confidence":"Medium","confidence_rationale":"Tier 2 — clean KD with defined cellular phenotype (TNF secretion) and discrimination from transcriptional effects, single lab","pmids":["34555867"],"is_preprint":false},{"year":2022,"finding":"Double knockout of RAB6A/A' and RAB6B in radial glial cells impairs apical localization of the apical determinant Crumbs3 (CRB3) and causes retraction of the apical process, leading to delamination and ectopic division of apical radial glia. RAB6+ post-Golgi vesicles move toward microtubule minus ends in an apical direction in a dynein-dependent manner, establishing a RAB6-dynein-LIS1 pathway for Golgi-to-apical-surface transport.","method":"Double KO mice/in utero electroporation, in situ subcellular live imaging, immunofluorescence, genetic epistasis with dynein activator LIS1 KO","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 — double KO with specific phenotypic readout, live imaging of vesicle dynamics, genetic epistasis defining pathway, replicated across multiple approaches","pmids":["35979738"],"is_preprint":false},{"year":2023,"finding":"The crystal structure of RAB6B in complex with the Rab6-binding domain of ELKS1 was solved, revealing that a C-terminal segment of ELKS1 forms a helical hairpin to recognize RAB6B through a unique binding mode. ELKS1 undergoes liquid-liquid phase separation (LLPS) that allows it to compete with other RAB6 effectors, accumulate RAB6B-coated liposomes, recruit RAB6B-coated vesicles to vesicle-releasing sites, and promote vesicle exocytosis.","method":"X-ray crystallography (co-crystal structure), in vitro reconstitution of LLPS, liposome binding assays, live-cell imaging of vesicle exocytosis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — co-crystal structure plus biochemical reconstitution plus cellular functional validation with multiple orthogonal approaches","pmids":["37172719"],"is_preprint":false},{"year":2023,"finding":"Epigenetic suppression of PGC1α in BRAF-inhibitor-resistant melanomas reduces RAB6B and RAB27A expression. Statin (HMGCR inhibitor) treatment blocks cell growth by lowering RAB6B and RAB27A prenylation, which reduces their membrane association and impairs integrin localization and downstream integrin-FAK signaling. Re-expression of both RAB6B and RAB27A together reverses statin vulnerability.","method":"Pharmacological inhibition, re-expression rescue experiments, Western blot for membrane fractionation, cell growth assays","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 — rescue experiment and membrane association assay link prenylation mechanistically to RAB6B function, single lab","pmids":["37277330"],"is_preprint":false},{"year":2024,"finding":"CNS-specific Rab6a/b double knockout mice exhibit severe neocortical and cerebellar dysplasia. In cultured Rab6a/b DKO neurons, synaptic vesicle precursors (SVPs) abnormally accumulate adjacent to the Golgi apparatus, leading to defects in axonal extension and loss of axon-dendrite polarity. Rab6 DKO also causes significant lysosome expansion in neuronal soma, demonstrating that RAB6-mediated polarized transport of SVPs from the Golgi is essential for neuronal polarization and brain development.","method":"CNS-specific double knockout mice, live-cell imaging of vesicle trafficking, immunofluorescence, electron microscopy","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — in vivo DKO with specific developmental phenotype plus in vitro mechanistic dissection of SVP accumulation","pmids":["38830762"],"is_preprint":false},{"year":2019,"finding":"miR-4268 directly targets RAB6B mRNA in gastric cancer cells. Silencing of RAB6B phenocopies miR-4268 overexpression, inhibiting cell proliferation and G1/S transition via suppression of AKT/JNK signaling pathways and modulation of Cyclin D1 and CDK4.","method":"Luciferase reporter assay (direct targeting), siRNA knockdown, cell cycle analysis, Western blot for AKT/JNK pathway","journal":"Cancer gene therapy","confidence":"Medium","confidence_rationale":"Tier 3 — direct targeting validated by luciferase assay and phenotypic follow-up, single lab, pathway placement indirect","pmids":["31303644"],"is_preprint":false},{"year":2023,"finding":"miR-6216 directly targets RAB6B and negatively regulates its expression. Overexpression of miR-6216 inhibited neural stem cell (NSC) proliferation, while overexpression of RAB6B promoted NSC proliferation, placing RAB6B as a positive regulator of NSC proliferation downstream of miR-6216.","method":"miRNA overexpression, RAB6B overexpression, NSC proliferation assays","journal":"Neuroscience research","confidence":"Low","confidence_rationale":"Tier 3 — single lab, single method without direct luciferase validation for targeting shown in this abstract","pmids":["37059126"],"is_preprint":false},{"year":2017,"finding":"RAB6B was identified as a protein that co-immunoprecipitates with CEA (carcinoembryonic antigen) in LoVo colon cancer cells, suggesting a physical interaction between RAB6B and CEA.","method":"Co-immunoprecipitation followed by LC-MS/MS","journal":"Radiation oncology journal","confidence":"Low","confidence_rationale":"Tier 3 — single co-IP/MS without functional validation of the interaction","pmids":["28881503"],"is_preprint":false}],"current_model":"RAB6B is a brain-enriched small GTPase that localizes to the Golgi apparatus and regulates retrograde and anterograde vesicular trafficking: in its GTP-bound state it recruits effectors including Bicaudal-D1 (linking it to the dynein/dynactin motor complex), DYNLRB1 (a dynein light chain), and ELKS1 (which via liquid-liquid phase separation captures RAB6B-coated vesicles for exocytosis); double knockout with Rab6A abolishes polarized Golgi-to-apical transport of Crumbs3 in radial glia (causing delamination) and prevents axonal delivery of synaptic vesicle precursors in neurons, while in macrophages RAB6B promotes post-translational trafficking and secretion of TNF, and statin treatment impairs RAB6B function by blocking its membrane-targeting prenylation."},"narrative":{"teleology":[{"year":2000,"claim":"Identification of RAB6B as a distinct Rab6 subfamily member with Golgi/ERGIC localization and interaction with known Rab6A effectors established that a second Rab6 isoform operates in retrograde Golgi trafficking.","evidence":"cDNA cloning, immunofluorescence, GTP-binding assays, and constitutively active mutant co-localization in mammalian cells","pmids":["10893188"],"confidence":"High","gaps":["Endogenous expression pattern across tissues not fully resolved","Functional redundancy with Rab6A not tested","No loss-of-function data"]},{"year":2006,"claim":"High-resolution crystal structures of RAB6B in both nucleotide states revealed that conformational switching in switch I/II and the Rab6-specific RabSF3 region may underlie effector selectivity distinct from other Rab GTPases.","evidence":"X-ray crystallography at 2.3 Å (GDP) and 1.8 Å (GTPγS) resolution","pmids":["16790928"],"confidence":"High","gaps":["No effector-bound structure to confirm RabSF3 role in selectivity","No mutagenesis of RabSF3 residues to test functional relevance"]},{"year":2007,"claim":"Demonstration that GTP-bound RAB6B recruits Bicaudal-D1 (BICD1) and co-localizes with dynein in neurites established the molecular link between RAB6B and the dynein/dynactin motor complex for bidirectional vesicle transport in neurons.","evidence":"Yeast two-hybrid, reciprocal co-immunoprecipitation, pull-down, and live-cell imaging in SK-N-SH neuronal cells","pmids":["17707369"],"confidence":"High","gaps":["Directionality of RAB6B-dependent cargo movement not resolved","No loss-of-function of BICD1 to test requirement for RAB6B transport"]},{"year":2008,"claim":"Discovery that RAB6B binds the dynein light chain DYNLRB1 preferentially in its GDP-bound state—unlike Rab6A—revealed nucleotide-state-specific effector engagement within the Rab6 subfamily, suggesting distinct regulatory modes.","evidence":"Yeast two-hybrid, co-immunoprecipitation, and pull-down with nucleotide-loaded forms","pmids":["18044744"],"confidence":"High","gaps":["Functional consequence of GDP-preferential binding not established","Whether DYNLRB1 acts as a GDI-like chaperone or transport regulator for RAB6B unknown"]},{"year":2021,"claim":"Knockdown of Rab6b in macrophages reduced TNF secretion without affecting mRNA or total protein levels, establishing a non-neuronal function for RAB6B in post-translational secretory trafficking of cytokines.","evidence":"siRNA knockdown, ELISA, qRT-PCR, and Western blot in BCG-infected primary mouse macrophages","pmids":["34555867"],"confidence":"Medium","gaps":["Specific vesicle intermediate carrying TNF not identified","Rescue with wild-type or mutant RAB6B not shown","Single lab finding"]},{"year":2022,"claim":"Double knockout of Rab6a and Rab6b in radial glia proved that RAB6-mediated dynein-dependent Golgi-to-apical transport of Crumbs3 is essential for maintaining apical progenitor identity, resolving the in vivo cargo and pathway for polarized sorting.","evidence":"Double KO mice, in utero electroporation, live imaging of post-Golgi vesicles, genetic epistasis with LIS1 KO","pmids":["35979738"],"confidence":"High","gaps":["Individual contributions of Rab6a versus Rab6b not separable in DKO","Whether RAB6B alone is sufficient for CRB3 transport not tested"]},{"year":2023,"claim":"The co-crystal structure of RAB6B with ELKS1 and reconstitution of ELKS1 liquid-liquid phase separation showed how ELKS1 condenses RAB6B-coated vesicles at exocytic sites, providing a structural and biophysical mechanism for RAB6B-directed vesicle exocytosis.","evidence":"X-ray crystallography of RAB6B–ELKS1 complex, in vitro LLPS reconstitution, liposome binding, and live-cell vesicle exocytosis imaging","pmids":["37172719"],"confidence":"High","gaps":["In vivo validation of LLPS-dependent vesicle capture not performed","Whether ELKS1 LLPS is required for all RAB6B-dependent exocytosis or only at specific release sites unclear"]},{"year":2023,"claim":"Statin-mediated blockade of RAB6B prenylation impaired its membrane association and downstream integrin-FAK signaling in BRAF-inhibitor-resistant melanoma, linking RAB6B lipid modification to cell surface receptor trafficking.","evidence":"HMGCR inhibition, membrane fractionation, re-expression rescue of RAB6B and RAB27A together, cell growth assays in melanoma lines","pmids":["37277330"],"confidence":"Medium","gaps":["Individual contribution of RAB6B versus RAB27A not resolved (dual rescue required)","Direct trafficking of specific integrins by RAB6B not shown"]},{"year":2024,"claim":"CNS-specific Rab6a/b double knockout demonstrated that RAB6 is required for axonal delivery of synaptic vesicle precursors and neuronal polarization, with DKO causing SVP accumulation near the Golgi, lysosome expansion, and severe cortical and cerebellar dysplasia.","evidence":"CNS-specific DKO mice, live imaging of SVP trafficking, immunofluorescence, and electron microscopy in cultured neurons","pmids":["38830762"],"confidence":"High","gaps":["Mechanism of lysosome expansion in DKO neurons not defined","Whether RAB6B alone is essential or fully redundant with Rab6A in neurons remains unresolved"]},{"year":null,"claim":"The individual, non-redundant functions of RAB6B versus RAB6A remain undefined: single Rab6b knockout phenotypes have not been reported, and the specific cargoes, GAPs, and GEFs acting selectively on RAB6B are unknown.","evidence":"","pmids":[],"confidence":"High","gaps":["No single Rab6b knockout phenotype reported","RAB6B-specific GEF and GAP not identified","Full cargo repertoire of RAB6B-positive vesicles uncharacterized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003924","term_label":"GTPase activity","supporting_discovery_ids":[0,1]}],"localization":[{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[0,2,3,5,6,9]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[0,2,6,7,9]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[2,6,7,9]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[5,6,8,9]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[6,9]}],"complexes":[],"partners":["BICD1","DYNLRB1","ELKS1","GDAP1"],"other_free_text":[]},"mechanistic_narrative":"RAB6B is a brain-enriched small GTPase of the Rab6 subfamily that cycles between GDP- and GTP-bound states to coordinate vesicular trafficking at the Golgi apparatus, functioning in both retrograde and anterograde transport pathways. In its GTP-bound form, RAB6B recruits effectors including Bicaudal-D1 (BICD1), which couples RAB6B-positive vesicles to the dynein/dynactin motor complex for minus-end-directed transport, and ELKS1, whose liquid-liquid phase separation captures RAB6B-coated vesicles at exocytic release sites; RAB6B also binds the dynein light chain DYNLRB1 preferentially in its GDP-bound state [PMID:17707369, PMID:37172719, PMID:18044744]. Combined loss of Rab6a and Rab6b in radial glia abolishes polarized Golgi-to-apical delivery of Crumbs3, causing progenitor delamination, while in neurons it prevents axonal transport of synaptic vesicle precursors, resulting in severe neocortical and cerebellar dysplasia [PMID:35979738, PMID:38830762]. RAB6B also promotes post-translational secretory trafficking of TNF in macrophages, and its membrane targeting depends on prenylation, which when pharmacologically blocked impairs integrin localization and downstream signaling [PMID:34555867, PMID:37277330]."},"prefetch_data":{"uniprot":{"accession":"Q9NRW1","full_name":"Ras-related protein Rab-6B","aliases":[],"length_aa":208,"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 active GTP-bound and inactive GDP-bound states. In their active state, drive transport of vesicular carriers from donor organelles to acceptor organelles to regulate the membrane traffic that maintains organelle identity and morphology (By similarity). Recruits VPS13B to the Golgi membrane (PubMed:25492866). Regulates the compacted morphology of the Golgi (PubMed:26209634). Seems to have a role in retrograde membrane traffic at the level of the Golgi complex. May function in retrograde transport in neuronal cells (PubMed:17707369). Plays a role in neuron projection development (PubMed:25492866)","subcellular_location":"Golgi apparatus membrane; Endoplasmic reticulum-Golgi intermediate compartment; Cytoplasmic vesicle","url":"https://www.uniprot.org/uniprotkb/Q9NRW1/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RAB6B","classification":"Not Classified","n_dependent_lines":5,"n_total_lines":1208,"dependency_fraction":0.0041390728476821195},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000154917","cell_line_id":"CID000440","localizations":[{"compartment":"golgi","grade":3},{"compartment":"vesicles","grade":2},{"compartment":"er","grade":1}],"interactors":[{"gene":"GDI1","stoichiometry":0.2},{"gene":"GDI2","stoichiometry":0.2},{"gene":"SPCS3","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID000440","total_profiled":1310},"omim":[{"mim_id":"617002","title":"BICD FAMILY-LIKE CARGO ADAPTOR 1; BICDL1","url":"https://www.omim.org/entry/617002"},{"mim_id":"615852","title":"RAS-ASSOCIATED PROTEIN RAB6B; RAB6B","url":"https://www.omim.org/entry/615852"},{"mim_id":"615850","title":"VPS53 SUBUNIT OF GARP COMPLEX; VPS53","url":"https://www.omim.org/entry/615850"},{"mim_id":"614633","title":"VPS54 SUBUNIT OF GARP COMPLEX; VPS54","url":"https://www.omim.org/entry/614633"},{"mim_id":"603443","title":"VPS52 SUBUNIT OF GARP COMPLEX; VPS52","url":"https://www.omim.org/entry/603443"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Golgi apparatus","reliability":"Supported"},{"location":"Basal body","reliability":"Additional"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"brain","ntpm":131.0}],"url":"https://www.proteinatlas.org/search/RAB6B"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"Q9NRW1","domains":[{"cath_id":"3.40.50.300","chopping":"12-172","consensus_level":"high","plddt":95.4375,"start":12,"end":172}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NRW1","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NRW1-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NRW1-F1-predicted_aligned_error_v6.png","plddt_mean":85.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RAB6B","jax_strain_url":"https://www.jax.org/strain/search?query=RAB6B"},"sequence":{"accession":"Q9NRW1","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9NRW1.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9NRW1/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NRW1"}},"corpus_meta":[{"pmid":"10893188","id":"PMC_10893188","title":"The small 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It displays lower GTP-binding activity compared to Rab6A, and in overexpression distributes over both Golgi and ER membranes. The GTP-bound form (Q72L mutant) interacts with all known Rab6A effectors including Rabkinesin-6, suggesting a role in retrograde membrane traffic at the Golgi complex.\",\n      \"method\": \"cDNA cloning, immunofluorescence, northern blot, GTP-binding assays, overexpression of constitutively active mutant, co-localization studies\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (biochemical assays, localization, mutagenesis) in foundational paper, 105 citations\",\n      \"pmids\": [\"10893188\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Crystal structures of human neuronal RAB6B solved in the inactive (MgGDP-bound) and active (MgGTPγS-bound) forms at 2.3 Å and 1.8 Å resolution, respectively. Conformational changes between states occur mainly in switch I and switch II regions, and an additional change is observed in the Rab6 subfamily-specific RabSF3 region, which may contribute to effector specificity.\",\n      \"method\": \"X-ray crystallography\",\n      \"journal\": \"Acta crystallographica. Section D, Biological crystallography\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution crystal structures of both nucleotide states with structural validation\",\n      \"pmids\": [\"16790928\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"RAB6B interacts with Bicaudal-D1 (BICD1) in its GTP-bound (active) form, as shown by yeast two-hybrid, co-immunoprecipitation, and pull-down assays. RAB6B and BICD1 co-localize at the Golgi and along microtubule-aligned vesicles, and both co-localize with dynein in neurites of SK-N-SH neuronal cells. Live imaging showed bi-directional movement of EGFP-RAB6B structures in neurites, indicating RAB6B links to the dynein/dynactin complex via BICD1 to regulate retrograde transport in neuronal cells.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, pull-down assay, confocal microscopy, live-cell imaging\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP and multiple orthogonal methods with functional context in neuronal cells\",\n      \"pmids\": [\"17707369\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"RAB6B interacts with the dynein light chain DYNLRB1, as demonstrated by yeast two-hybrid, co-immunoprecipitation, and pull-down studies. Unlike Rab6A which preferentially binds DYNLRB1 in the GTP-bound state, RAB6B (and Rab6A') associates preferentially with DYNLRB1 in the GDP-bound state. DYNLRB1 co-localizes with RAB6B isoforms at the Golgi apparatus.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, pull-down assay, co-localization by fluorescence microscopy\",\n      \"journal\": \"Cell motility and the cytoskeleton\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods demonstrating direct interaction with nucleotide-state preference\",\n      \"pmids\": [\"18044744\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"RAB6B physically interacts with the outer mitochondrial membrane protein GDAP1 (mutated in Charcot-Marie-Tooth disease), placing RAB6B in a vesicle-organelle trafficking complex that may participate in mitochondrial movement within the cell.\",\n      \"method\": \"Co-immunoprecipitation/pull-down (interaction identified in GDAP1 silencing study)\",\n      \"journal\": \"Neurobiology of disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single pull-down/Co-IP identification of interaction without detailed mechanistic follow-up for RAB6B specifically\",\n      \"pmids\": [\"23542510\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RAB6B is expressed in primary mouse macrophages where it localizes to the Golgi complex. Knockdown of Rab6b reduced TNF secretion by M. bovis BCG-infected macrophages without affecting Tnf mRNA or intracellular TNF protein levels, indicating RAB6B promotes post-translational trafficking and secretion of TNF in macrophages.\",\n      \"method\": \"siRNA knockdown, ELISA, qRT-PCR, Western blot, immunofluorescence/confocal microscopy\",\n      \"journal\": \"Immunology and cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KD with defined cellular phenotype (TNF secretion) and discrimination from transcriptional effects, single lab\",\n      \"pmids\": [\"34555867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Double knockout of RAB6A/A' and RAB6B in radial glial cells impairs apical localization of the apical determinant Crumbs3 (CRB3) and causes retraction of the apical process, leading to delamination and ectopic division of apical radial glia. RAB6+ post-Golgi vesicles move toward microtubule minus ends in an apical direction in a dynein-dependent manner, establishing a RAB6-dynein-LIS1 pathway for Golgi-to-apical-surface transport.\",\n      \"method\": \"Double KO mice/in utero electroporation, in situ subcellular live imaging, immunofluorescence, genetic epistasis with dynein activator LIS1 KO\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — double KO with specific phenotypic readout, live imaging of vesicle dynamics, genetic epistasis defining pathway, replicated across multiple approaches\",\n      \"pmids\": [\"35979738\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"The crystal structure of RAB6B in complex with the Rab6-binding domain of ELKS1 was solved, revealing that a C-terminal segment of ELKS1 forms a helical hairpin to recognize RAB6B through a unique binding mode. ELKS1 undergoes liquid-liquid phase separation (LLPS) that allows it to compete with other RAB6 effectors, accumulate RAB6B-coated liposomes, recruit RAB6B-coated vesicles to vesicle-releasing sites, and promote vesicle exocytosis.\",\n      \"method\": \"X-ray crystallography (co-crystal structure), in vitro reconstitution of LLPS, liposome binding assays, live-cell imaging of vesicle exocytosis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — co-crystal structure plus biochemical reconstitution plus cellular functional validation with multiple orthogonal approaches\",\n      \"pmids\": [\"37172719\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Epigenetic suppression of PGC1α in BRAF-inhibitor-resistant melanomas reduces RAB6B and RAB27A expression. Statin (HMGCR inhibitor) treatment blocks cell growth by lowering RAB6B and RAB27A prenylation, which reduces their membrane association and impairs integrin localization and downstream integrin-FAK signaling. Re-expression of both RAB6B and RAB27A together reverses statin vulnerability.\",\n      \"method\": \"Pharmacological inhibition, re-expression rescue experiments, Western blot for membrane fractionation, cell growth assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — rescue experiment and membrane association assay link prenylation mechanistically to RAB6B function, single lab\",\n      \"pmids\": [\"37277330\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CNS-specific Rab6a/b double knockout mice exhibit severe neocortical and cerebellar dysplasia. In cultured Rab6a/b DKO neurons, synaptic vesicle precursors (SVPs) abnormally accumulate adjacent to the Golgi apparatus, leading to defects in axonal extension and loss of axon-dendrite polarity. Rab6 DKO also causes significant lysosome expansion in neuronal soma, demonstrating that RAB6-mediated polarized transport of SVPs from the Golgi is essential for neuronal polarization and brain development.\",\n      \"method\": \"CNS-specific double knockout mice, live-cell imaging of vesicle trafficking, immunofluorescence, electron microscopy\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo DKO with specific developmental phenotype plus in vitro mechanistic dissection of SVP accumulation\",\n      \"pmids\": [\"38830762\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"miR-4268 directly targets RAB6B mRNA in gastric cancer cells. Silencing of RAB6B phenocopies miR-4268 overexpression, inhibiting cell proliferation and G1/S transition via suppression of AKT/JNK signaling pathways and modulation of Cyclin D1 and CDK4.\",\n      \"method\": \"Luciferase reporter assay (direct targeting), siRNA knockdown, cell cycle analysis, Western blot for AKT/JNK pathway\",\n      \"journal\": \"Cancer gene therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — direct targeting validated by luciferase assay and phenotypic follow-up, single lab, pathway placement indirect\",\n      \"pmids\": [\"31303644\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"miR-6216 directly targets RAB6B and negatively regulates its expression. Overexpression of miR-6216 inhibited neural stem cell (NSC) proliferation, while overexpression of RAB6B promoted NSC proliferation, placing RAB6B as a positive regulator of NSC proliferation downstream of miR-6216.\",\n      \"method\": \"miRNA overexpression, RAB6B overexpression, NSC proliferation assays\",\n      \"journal\": \"Neuroscience research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single lab, single method without direct luciferase validation for targeting shown in this abstract\",\n      \"pmids\": [\"37059126\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RAB6B was identified as a protein that co-immunoprecipitates with CEA (carcinoembryonic antigen) in LoVo colon cancer cells, suggesting a physical interaction between RAB6B and CEA.\",\n      \"method\": \"Co-immunoprecipitation followed by LC-MS/MS\",\n      \"journal\": \"Radiation oncology journal\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single co-IP/MS without functional validation of the interaction\",\n      \"pmids\": [\"28881503\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RAB6B is a brain-enriched small GTPase that localizes to the Golgi apparatus and regulates retrograde and anterograde vesicular trafficking: in its GTP-bound state it recruits effectors including Bicaudal-D1 (linking it to the dynein/dynactin motor complex), DYNLRB1 (a dynein light chain), and ELKS1 (which via liquid-liquid phase separation captures RAB6B-coated vesicles for exocytosis); double knockout with Rab6A abolishes polarized Golgi-to-apical transport of Crumbs3 in radial glia (causing delamination) and prevents axonal delivery of synaptic vesicle precursors in neurons, while in macrophages RAB6B promotes post-translational trafficking and secretion of TNF, and statin treatment impairs RAB6B function by blocking its membrane-targeting prenylation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"RAB6B is a brain-enriched small GTPase of the Rab6 subfamily that cycles between GDP- and GTP-bound states to coordinate vesicular trafficking at the Golgi apparatus, functioning in both retrograde and anterograde transport pathways. In its GTP-bound form, RAB6B recruits effectors including Bicaudal-D1 (BICD1), which couples RAB6B-positive vesicles to the dynein/dynactin motor complex for minus-end-directed transport, and ELKS1, whose liquid-liquid phase separation captures RAB6B-coated vesicles at exocytic release sites; RAB6B also binds the dynein light chain DYNLRB1 preferentially in its GDP-bound state [PMID:17707369, PMID:37172719, PMID:18044744]. Combined loss of Rab6a and Rab6b in radial glia abolishes polarized Golgi-to-apical delivery of Crumbs3, causing progenitor delamination, while in neurons it prevents axonal transport of synaptic vesicle precursors, resulting in severe neocortical and cerebellar dysplasia [PMID:35979738, PMID:38830762]. RAB6B also promotes post-translational secretory trafficking of TNF in macrophages, and its membrane targeting depends on prenylation, which when pharmacologically blocked impairs integrin localization and downstream signaling [PMID:34555867, PMID:37277330].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Identification of RAB6B as a distinct Rab6 subfamily member with Golgi/ERGIC localization and interaction with known Rab6A effectors established that a second Rab6 isoform operates in retrograde Golgi trafficking.\",\n      \"evidence\": \"cDNA cloning, immunofluorescence, GTP-binding assays, and constitutively active mutant co-localization in mammalian cells\",\n      \"pmids\": [\"10893188\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous expression pattern across tissues not fully resolved\", \"Functional redundancy with Rab6A not tested\", \"No loss-of-function data\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"High-resolution crystal structures of RAB6B in both nucleotide states revealed that conformational switching in switch I/II and the Rab6-specific RabSF3 region may underlie effector selectivity distinct from other Rab GTPases.\",\n      \"evidence\": \"X-ray crystallography at 2.3 Å (GDP) and 1.8 Å (GTPγS) resolution\",\n      \"pmids\": [\"16790928\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No effector-bound structure to confirm RabSF3 role in selectivity\", \"No mutagenesis of RabSF3 residues to test functional relevance\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Demonstration that GTP-bound RAB6B recruits Bicaudal-D1 (BICD1) and co-localizes with dynein in neurites established the molecular link between RAB6B and the dynein/dynactin motor complex for bidirectional vesicle transport in neurons.\",\n      \"evidence\": \"Yeast two-hybrid, reciprocal co-immunoprecipitation, pull-down, and live-cell imaging in SK-N-SH neuronal cells\",\n      \"pmids\": [\"17707369\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Directionality of RAB6B-dependent cargo movement not resolved\", \"No loss-of-function of BICD1 to test requirement for RAB6B transport\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Discovery that RAB6B binds the dynein light chain DYNLRB1 preferentially in its GDP-bound state—unlike Rab6A—revealed nucleotide-state-specific effector engagement within the Rab6 subfamily, suggesting distinct regulatory modes.\",\n      \"evidence\": \"Yeast two-hybrid, co-immunoprecipitation, and pull-down with nucleotide-loaded forms\",\n      \"pmids\": [\"18044744\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of GDP-preferential binding not established\", \"Whether DYNLRB1 acts as a GDI-like chaperone or transport regulator for RAB6B unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Knockdown of Rab6b in macrophages reduced TNF secretion without affecting mRNA or total protein levels, establishing a non-neuronal function for RAB6B in post-translational secretory trafficking of cytokines.\",\n      \"evidence\": \"siRNA knockdown, ELISA, qRT-PCR, and Western blot in BCG-infected primary mouse macrophages\",\n      \"pmids\": [\"34555867\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific vesicle intermediate carrying TNF not identified\", \"Rescue with wild-type or mutant RAB6B not shown\", \"Single lab finding\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Double knockout of Rab6a and Rab6b in radial glia proved that RAB6-mediated dynein-dependent Golgi-to-apical transport of Crumbs3 is essential for maintaining apical progenitor identity, resolving the in vivo cargo and pathway for polarized sorting.\",\n      \"evidence\": \"Double KO mice, in utero electroporation, live imaging of post-Golgi vesicles, genetic epistasis with LIS1 KO\",\n      \"pmids\": [\"35979738\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Individual contributions of Rab6a versus Rab6b not separable in DKO\", \"Whether RAB6B alone is sufficient for CRB3 transport not tested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"The co-crystal structure of RAB6B with ELKS1 and reconstitution of ELKS1 liquid-liquid phase separation showed how ELKS1 condenses RAB6B-coated vesicles at exocytic sites, providing a structural and biophysical mechanism for RAB6B-directed vesicle exocytosis.\",\n      \"evidence\": \"X-ray crystallography of RAB6B–ELKS1 complex, in vitro LLPS reconstitution, liposome binding, and live-cell vesicle exocytosis imaging\",\n      \"pmids\": [\"37172719\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo validation of LLPS-dependent vesicle capture not performed\", \"Whether ELKS1 LLPS is required for all RAB6B-dependent exocytosis or only at specific release sites unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Statin-mediated blockade of RAB6B prenylation impaired its membrane association and downstream integrin-FAK signaling in BRAF-inhibitor-resistant melanoma, linking RAB6B lipid modification to cell surface receptor trafficking.\",\n      \"evidence\": \"HMGCR inhibition, membrane fractionation, re-expression rescue of RAB6B and RAB27A together, cell growth assays in melanoma lines\",\n      \"pmids\": [\"37277330\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Individual contribution of RAB6B versus RAB27A not resolved (dual rescue required)\", \"Direct trafficking of specific integrins by RAB6B not shown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"CNS-specific Rab6a/b double knockout demonstrated that RAB6 is required for axonal delivery of synaptic vesicle precursors and neuronal polarization, with DKO causing SVP accumulation near the Golgi, lysosome expansion, and severe cortical and cerebellar dysplasia.\",\n      \"evidence\": \"CNS-specific DKO mice, live imaging of SVP trafficking, immunofluorescence, and electron microscopy in cultured neurons\",\n      \"pmids\": [\"38830762\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of lysosome expansion in DKO neurons not defined\", \"Whether RAB6B alone is essential or fully redundant with Rab6A in neurons remains unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The individual, non-redundant functions of RAB6B versus RAB6A remain undefined: single Rab6b knockout phenotypes have not been reported, and the specific cargoes, GAPs, and GEFs acting selectively on RAB6B are unknown.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No single Rab6b knockout phenotype reported\", \"RAB6B-specific GEF and GAP not identified\", \"Full cargo repertoire of RAB6B-positive vesicles uncharacterized\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003924\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [0, 2, 3, 5, 6, 9]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [0, 2, 6, 7, 9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [2, 6, 7, 9]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [5, 6, 8, 9]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [6, 9]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"BICD1\",\n      \"DYNLRB1\",\n      \"ELKS1\",\n      \"GDAP1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}