{"gene":"RAB6A","run_date":"2026-04-28T19:45:45","timeline":{"discoveries":[{"year":1994,"finding":"Rab6 controls intra-Golgi transport, specifically between cis/medial and late (trans) Golgi compartments; overexpression of GTP-bound (Q72L) or wild-type Rab6 blocks transport between these compartments without affecting ER-to-cis/medial Golgi or TGN-to-plasma membrane transport.","method":"Transient overexpression of wild-type, GTP-bound (Q72L) and GDP-bound (T27N) mutants in HeLa and L cells; intracellular transport assays with SEAP and influenza HA","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1-2 — multiple mutants with defined transport assays, replicated across cell lines","pmids":["7798313"],"is_preprint":false},{"year":1994,"finding":"Golgi apparatus localization of Rab6 requires geranylgeranylation at its CXC C-terminal motif and sequences within the N-terminal 71 amino acids (including the effector domain); farnesylation alone cannot substitute for geranylgeranylation in Golgi targeting.","method":"Chimeric Ras-Rab proteins, C-terminal lipid modification mutants, immunofluorescence, yeast complementation assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis with structure-function analysis and multiple readouts","pmids":["8264642"],"is_preprint":false},{"year":1994,"finding":"Geranylgeranylation on CXC or CC motifs is required for efficient membrane extraction of Rab6 by RabGDI; the effector domain, loop3/beta3, and hypervariable region of Rab6 are all required for RabGDI binding, while loop3/beta3 and hypervariable region (but not the effector domain) are required for RabGGTase processing.","method":"In vitro RabGDI membrane extraction assay with Rab6 mutants carrying various C-terminal lipid modifications; mutagenesis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro biochemical reconstitution with systematic mutagenesis","pmids":["8175798"],"is_preprint":false},{"year":1995,"finding":"GDI beta interacts with wild-type Rab6 and Rab5 but not with a GTP-bound Rab6 mutant, and recombinant GDI beta can remove Rab6 (and other Rabs including Rab1, Rab2, Rab4) from membranes.","method":"Yeast two-hybrid screen; recombinant GDI beta membrane extraction assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — yeast two-hybrid plus in vitro functional reconstitution","pmids":["7782346"],"is_preprint":false},{"year":1996,"finding":"Rab6 antibodies and a trans-dominant Rab6 mutant (N126I) inhibit transport between cis and medial Golgi cisternae and inhibit fusion of Golgi membranes in a cell-free reconstituted transport system, indicating Rab6 is required for membrane fusion at Golgi cisternal membranes.","method":"Reconstituted in vitro Golgi transport assay; inhibition with polyclonal antibodies, Fab fragments, and dominant-negative Rab6 N126I mutant","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with antibody inhibition and dominant-negative mutant","pmids":["8663167"],"is_preprint":false},{"year":1997,"finding":"GTP-bound Rab6 (Q72L) and wild-type Rab6 overexpression induces microtubule-dependent redistribution of trans-Golgi proteins (beta-1,4-galactosyltransferase) into the ER, phenocopying brefeldin A effects; this retrograde Golgi-to-ER transport requires intact microtubules.","method":"Overexpression of wild-type and GTP/GDP mutants of Rab6 in HeLa cells; immunofluorescence and biochemical analyses; microtubule depolymerization experiments","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — multiple mutants, morphological and biochemical readouts, mechanistic link to microtubules","pmids":["9050864"],"is_preprint":false},{"year":1998,"finding":"Rab6 binds specifically to the GTP-bound form of Rab6, and this interaction is mediated by the C-terminal domain of Rabkinesin-6 (KIF20A); Rabkinesin-6 localizes to the Golgi apparatus and its overexpression (C-terminal domain) inhibits Rab6-GTP effects on intracellular transport, identifying a kinesin motor as a Rab6 effector.","method":"Two-hybrid screen; co-immunoprecipitation; immunofluorescence localization; dominant-negative overexpression transport assay","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 — yeast two-hybrid plus reciprocal pull-down, replicated with functional inhibition assay","pmids":["9438855"],"is_preprint":false},{"year":1999,"finding":"Rab6 regulates a COPI-independent Golgi-to-ER retrograde transport pathway; Rab6-positive transport carriers specifically carry retrograde cargo (Shiga toxin B-fragment) and associate with ER; Rab6:GDP (T27N) overexpression inhibits Shiga holotoxin cytotoxicity without blocking STB transport to the Golgi; COPI markers are excluded from Rab6/STB transport carriers.","method":"Live fluorescence imaging of FP-Rab6 with secretory pathway markers; COPI antibody microinjection; vaccinia-T7 overexpression of Rab6 T27N; confocal and time-lapse microscopy","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — live imaging with multiple cargo markers, antibody inhibition, dominant-negative mutant; replicated in multiple labs","pmids":["10562278"],"is_preprint":false},{"year":1999,"finding":"GAPCenA is a novel GAP specifically active on Rab6 in vitro (and to lesser extent on Rab4 and Rab2); GAPCenA is predominantly cytosolic with a minor pool at the centrosome, forms complexes with gamma-tubulin, and plays a role in microtubule nucleation.","method":"In vitro GAP activity assay on recombinant Rab proteins; immunofluorescence; cell fractionation; co-immunoprecipitation with gamma-tubulin","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro enzymatic assay plus localization with co-IP","pmids":["10202141"],"is_preprint":false},{"year":1999,"finding":"Golgins golgin-230/245/256 and golgin-97 target to the Golgi apparatus through a conserved C-terminal domain containing a critical tyrosine residue that preferentially binds Rab6; mutations abolishing Golgi targeting also abolish Rab6 binding, identifying a Rab6-interacting domain defining a family of Golgi-targeted coiled-coil proteins.","method":"Protein blot binding assay; mutagenesis; Golgi targeting assays; sequence analysis","journal":"Current biology","confidence":"High","confidence_rationale":"Tier 2 — binding assay combined with mutagenesis and functional targeting assay","pmids":["10209123"],"is_preprint":false},{"year":2000,"finding":"Rab6A and Rab6A' are two distinct isoforms generated by alternative splicing of the RAB6A gene, differing in only 3 amino acids near the PM3 GTP-binding domain; Rab6A' does not bind Rabkinesin-6 (a Rab6A effector) due to a single amino acid difference at position 87 (T vs A), and Rab6A' overexpression does not induce redistribution of Golgi proteins to ER as Rab6A does.","method":"Molecular cloning and sequencing of human RAB6A gene; GTP-binding assays; immunofluorescence; yeast two-hybrid interaction with Rabkinesin-6 and GAPCenA; GTP-bound mutant overexpression in HeLa cells","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods, structure-function with single amino acid resolution","pmids":["11071909"],"is_preprint":false},{"year":2000,"finding":"Rab6-KIFL (KIF20A) accumulates in mitotic cells at the spindle midzone during anaphase and at the cleavage furrow and midbody during telophase; microinjection of anti-Rab6-KIFL antibodies causes cytokinesis failure (binucleate cells) by defecting cleavage furrow formation.","method":"Immunofluorescence; time-lapse microscopy; microinjection of inhibitory antibodies; overexpression cytokinesis assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — antibody microinjection with time-lapse imaging provides direct functional evidence","pmids":["11060022"],"is_preprint":false},{"year":2002,"finding":"Rab6a' (but not Rab6a) is required for early/recycling endosome-to-TGN retrograde transport, working together with specific SNARE complexes (syntaxin 6, syntaxin 16, Vti1a with VAMP3/cellubrevin or VAMP4); Rab6a has been implicated in Golgi-to-ER transport.","method":"Permeabilized cell retrograde transport assay; identification of SNARE interactions; functional depletion/inhibition studies","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — novel permeabilized cell system with functional implication of multiple pathway components","pmids":["11839770"],"is_preprint":false},{"year":2002,"finding":"Dynactin binds specifically to Rab6 (but not to other Golgi Rabs) and shows Rab6-dependent recruitment to Golgi membranes; Rab6 acts as a specificity factor controlling dynactin recruitment to membranes.","method":"Pulldown assays; immunofluorescence; Golgi membrane recruitment assay with dominant-negative and active Rab6 mutants","journal":"Current biology","confidence":"High","confidence_rationale":"Tier 2 — pulldown plus functional membrane recruitment assay with specificity controls (other Golgi Rabs)","pmids":["12401177"],"is_preprint":false},{"year":2002,"finding":"Rab6IP2A and Rab6IP2B specifically interact with all three Rab6 isoforms (Rab6A, A', B); they are recruited to Golgi membranes in a Rab6:GTP-dependent manner; overexpression of the Rab6-binding domain of Rab6IP2 inhibits retrograde transport of Shiga toxin B subunit from plasma membrane to Golgi, suggesting Rab6IP2 functions in the Rab6A'-regulated pathway.","method":"Yeast two-hybrid screen; Golgi membrane recruitment assay; Shiga toxin retrograde transport assay","journal":"Traffic","confidence":"Medium","confidence_rationale":"Tier 2-3 — yeast two-hybrid with functional transport inhibition, single lab","pmids":["11929610"],"is_preprint":false},{"year":2003,"finding":"Phage display-derived recombinant antibodies specific to GTP-bound Rab6 revealed that Rab6 is in its GTP-bound conformation on the Golgi apparatus and on transport intermediates; Rab6 GTPase activity modulates the geometry/morphology of transport intermediates.","method":"Antibody phage display; intracellular expression of GFP-tagged conformation-specific antibodies; live-cell imaging","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 — novel conformation sensor with live imaging; functional link to transport intermediate geometry","pmids":["12738866"],"is_preprint":false},{"year":2004,"finding":"Both Rab6A and Rab6A' GTP-restricted mutants promote microtubule-dependent recycling of Golgi resident glycosylation enzymes to the ER with similar efficiency; this Rab6-directed Golgi-to-ER recycling requires functional dynactin (inhibited by p50/dynamitin overexpression or C-terminal Bicaudal-D fragment), and is initiated from the trans-Golgi network.","method":"siRNA knockdown; overexpression of GTP-restricted mutants; live imaging; p50/dynamitin dominant-negative overexpression","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — siRNA plus dominant-negative approach with defined transport assays; epistasis with dynactin","pmids":["15483056"],"is_preprint":false},{"year":2004,"finding":"TMF/ARA160 is a Golgi golgin that binds to all three Rab6 isoforms; depletion of TMF by RNAi causes modest dispersal of Golgi membranes, indicating a role in Golgi organization.","method":"Co-immunoprecipitation; RNAi knockdown; immunofluorescence; sequence-based identification of conserved Rab6-binding motif","journal":"BMC cell biology","confidence":"Medium","confidence_rationale":"Tier 3 — Co-IP plus RNAi phenotype, single lab","pmids":["15128430"],"is_preprint":false},{"year":2006,"finding":"Rab6A' (but not Rab6A) is required for cell cycle progression through mitosis; Rab6A' alteration blocks cells in metaphase with the Mad2-spindle checkpoint activated; the Rab6 effector p150(Glued) (dynactin subunit) remains associated with kinetochores; GAPCenA depletion produces a similar phenotype, suggesting Rab6A' regulates dynein/dynactin dynamics at kinetochores for the metaphase/anaphase transition.","method":"siRNA knockdown of Rab6A'; time-lapse microscopy; immunofluorescence for spindle checkpoint markers; co-depletion of GAPCenA","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — siRNA with live imaging and molecular mechanism (p150Glued at kinetochores), epistasis with GAPCenA","pmids":["16395330"],"is_preprint":false},{"year":2006,"finding":"Rab6A and Rab6A' perform non-overlapping functions: Rab6A' knockdown (but not Rab6A) hampers retrograde transport of Shiga Toxin B-subunit and causes defects in Golgi-associated protein recycling through the ER; Rab6A' is required for cell cycle progression through mitosis; Ile62 is a key residue uncoupling Rab6A' functions in mitosis versus retrograde trafficking.","method":"siRNA with isoform-specific oligonucleotides; Shiga Toxin B retrograde transport assay; cell cycle analysis; mutagenesis of Ile62","journal":"Traffic","confidence":"High","confidence_rationale":"Tier 2 — isoform-specific siRNA with multiple functional readouts, mutagenesis","pmids":["16536738"],"is_preprint":false},{"year":2007,"finding":"Rab6 marks exocytotic vesicles and, together with kinesin-1, stimulates processive microtubule-based transport to the cell periphery; Rab6 directs targeting of secretory vesicles to plasma-membrane sites enriched in the cortical protein ELKS.","method":"Live-cell imaging; siRNA knockdown; co-immunoprecipitation; identification of ELKS as Rab6 effector; vesicle motility assays","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 — live imaging plus siRNA with defined cargo, identification of effector ELKS","pmids":["17681140"],"is_preprint":false},{"year":2007,"finding":"TMF/ARA160 knockdown blocks retrograde transport of Shiga toxin from early/recycling endosomes to TGN and causes Rab6-dependent displacement of GalNAc-T2 (but not GalT) from the Golgi; the cytoplasmic region of GalNAc-T2 is critical for TMF-dependent Golgi retention.","method":"RNAi knockdown of TMF and Rab6; Shiga toxin retrograde transport assay; immunofluorescence; chimeric protein analysis","journal":"Experimental cell research","confidence":"High","confidence_rationale":"Tier 2 — RNAi epistasis with transport assay and chimeric protein mechanistic follow-up","pmids":["17698061"],"is_preprint":false},{"year":2007,"finding":"Rab6 regulates two distinct retrograde Golgi trafficking pathways involving ZW10/RINT-1 and COG complexes; epistatic Rab6 depletion suppresses Golgi disruption caused by ZW10/RINT-1 or COG inactivation; BicaudalD C-terminal fragment (linking Rab6 to dynactin/dynein) suppresses ZW10 but not COG knockdown-induced disruption.","method":"siRNA epistasis experiments; dominant-negative Rab6 and BicaudalD expression; immunofluorescence; multiple depletion combinations","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — systematic epistasis with multiple pathway components, multiple orthogonal approaches","pmids":["17699596"],"is_preprint":false},{"year":2007,"finding":"Rab6-interacting protein 1 (R6IP1) binds both Rab6 (GTP-bound) and Rab11A (GTP-bound); R6IP1 is targeted to the Golgi in a Rab6-dependent manner; overexpression of R6IP1 promotes Rab11A–Rab6 interaction (detected by FRET/FLIM) and accumulates recycling endosomes in the pericentriolar area; R6IP1 function is required during metaphase and cytokinesis.","method":"Co-immunoprecipitation; FRET/FLIM in live cells; subcellular localization; dominant-negative and siRNA experiments; cell cycle analysis","journal":"Traffic","confidence":"High","confidence_rationale":"Tier 2 — FRET/FLIM plus co-IP, functional siRNA knockdown with cell cycle readout","pmids":["17725553"],"is_preprint":false},{"year":2008,"finding":"Rab6 GTPase interacts with gerodermia osteodysplastica protein SCYL1BP1 (GORAB); GORAB localizes to the Golgi apparatus; loss-of-function mutations in SCYL1BP1 cause gerodermia osteodysplastica, linking Rab6-associated secretory pathway abnormalities to this connective tissue disorder.","method":"Identification of disease mutations; co-localization studies; protein interaction assay","journal":"Nature genetics","confidence":"Medium","confidence_rationale":"Tier 3 — disease gene identification with Golgi localization; interaction with Rab6 demonstrated but mechanism not fully biochemically characterized in this paper","pmids":["18997784"],"is_preprint":false},{"year":2008,"finding":"DYNLRB1 (dynein light chain) specifically interacts with all three Rab6 isoforms; DYNLRB1 shows preferred association with GTP-bound Rab6A and GDP-bound Rab6A'/Rab6B; DYNLRB1 co-localizes with Rab6 at the Golgi apparatus, representing the first direct interaction between Rab6 and the dynein complex.","method":"Yeast two-hybrid; co-immunoprecipitation; pulldown assays; immunofluorescence co-localization","journal":"Cell motility and the cytoskeleton","confidence":"High","confidence_rationale":"Tier 2 — yeast two-hybrid plus reciprocal co-IP and pulldown across isoforms","pmids":["18044744"],"is_preprint":false},{"year":2008,"finding":"Rab6a interacts with effectors BicaudalD2, p150(Glued), and PIST through their coiled-coil domains; all three bind GTP-bound Rab6a with Kd in high nanomolar to low micromolar range; BicaudalD2 and p150 binding moderately inhibits Rab6a intrinsic GTPase activity; effectors display rapid on- and off-rates (single-step binding kinetics).","method":"In vitro binding/biophysical assays (ITC, fluorescence); GTPase activity assays; transient kinetic analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — rigorous in vitro biophysical characterization with multiple effectors and kinetic analysis","pmids":["19019823"],"is_preprint":false},{"year":2009,"finding":"Crystal structure of Rab6a-GTP in complex with a 378-residue fragment of Rab6IP1 was solved at 3.2 Å; the first and last alpha-helices of the RUN domain of Rab6IP1 mediate binding to switch I, switch II, and interswitch region of Rab6; comparison with GCC185 complex reveals conformational flexibility in Rab6's hydrophobic triad mediates recognition of distinct effectors.","method":"X-ray crystallography; structural comparison with Rab6-GCC185 complex","journal":"Structure","confidence":"High","confidence_rationale":"Tier 1 — crystal structure at 3.2 Å with structural validation and comparison","pmids":["19141279"],"is_preprint":false},{"year":2010,"finding":"BICDR-1 is a Rab6 effector that interacts with kinesin Kif1C and the dynein/dynactin complex; BICDR-1 regulates pericentrosomal localization of Rab6-positive secretory vesicles and restricts anterograde secretory transport, inhibiting neuritogenesis in early neuronal development; BICDR-1 is required for neural development in zebrafish.","method":"Co-immunoprecipitation; live-cell imaging; siRNA knockdown; zebrafish knockdown; fluorescence microscopy","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — co-IP, live imaging, in vivo zebrafish validation; multiple orthogonal methods","pmids":["20360680"],"is_preprint":false},{"year":2011,"finding":"Rab8A stably associates with exocytotic vesicles in a Rab6-dependent manner; Rab8A is required for docking and fusion of exocytotic carriers (not for budding or motility); Rab8A and ELKS act in the same pathway; MICAL3 links Rab8A and ELKS, and its monooxygenase activity is required for its own turnover and remodeling of vesicle-docking protein complexes.","method":"Live-cell imaging; siRNA knockdown; co-immunoprecipitation; dominant-negative MICAL3 expression; vesicle tracking","journal":"Current biology","confidence":"High","confidence_rationale":"Tier 2 — live imaging with siRNA and dominant-negative, multiple markers, defined pathway","pmids":["21596566"],"is_preprint":false},{"year":2012,"finding":"Human Ric1 and Rgp1 form a complex that acts as the guanine nucleotide exchange factor (GEF) for Rab6A, binding preferentially to GDP-bound Rab6A and catalyzing nucleotide exchange; Rab33B-GTP binds Ric1 at a distinct site, linking medial and late Golgi Rab proteins in a cascade; loss of Ric1 or Rgp1 destabilizes Rab6 and blocks Rab6-dependent retrograde transport of mannose-6-phosphate receptors.","method":"In vitro GEF nucleotide exchange assay; co-immunoprecipitation; siRNA knockdown with transport assay; binding assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro GEF assay plus siRNA functional validation and epistasis","pmids":["23091056"],"is_preprint":false},{"year":2012,"finding":"Rab6 depletion by electron tomography reveals accumulation of two classes of coated vesicles (clathrin-coated and COPI-coated) at the trans-Golgi/TGN and a >50% increase in Golgi cisternal number; Rab6 is essential for trafficking of these vesicles, and Golgi-to-cell-surface transport is delayed.","method":"Electron tomography; siRNA knockdown; electron microscopy; VSV-G cargo transport kinetics","journal":"Traffic","confidence":"High","confidence_rationale":"Tier 2 — high-resolution unbiased ultrastructural analysis plus functional cargo transport assay","pmids":["22335553"],"is_preprint":false},{"year":2013,"finding":"Rab6 depletion reduces TNF delivery to the cell surface in macrophages; Rab6-GFP localizes on TGN-derived tubular carriers marked by golgin p230; Rab6 depletion and inactive mutants alter tubular carrier egress and reduce p230 membrane association, suggesting Rab6 stabilizes p230 on tubular carriers to facilitate TNF transport.","method":"siRNA/shRNA knockdown; live-cell imaging; dominant-negative mutants; electron microscopy; TNF secretion ELISA","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 — siRNA with live imaging, ultrastructural analysis, and functional secretion assay","pmids":["23437303"],"is_preprint":false},{"year":2014,"finding":"COH1 (VPS13B) association with the Golgi complex depends on Rab6; RAB6A/A' knockdown prevents COH1 Golgi localization; constitutively active RAB6_Q72L preferentially co-immunoprecipitates with COH1, identifying COH1 as a RAB6 effector; COH1 depletion in neurons impairs neurite outgrowth.","method":"RNAi knockdown of RAB6A/A'; co-immunoprecipitation with active/inactive RAB6 mutants; membrane solubilization; primary neuron knockdown with morphological readout","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP with mutants, RNAi epistasis, functional neuronal assay","pmids":["25492866"],"is_preprint":false},{"year":2015,"finding":"KIF1C transports Rab6A-positive vesicles and can influence Golgi organization; KIF1C binds Rab6A directly both via its motor domain and C-terminus; Rab6A binding to the KIF1C motor domain inhibits microtubule interaction in vitro and in cells, decreasing the amount of motile KIF1C; KIF1C depletion slows protein delivery to the cell surface and causes Golgi fragmentation; KIF1C can protect Golgi membranes from fragmentation in the absence of an intact microtubule network, requiring both Rab6A-binding sites.","method":"In vitro microtubule binding assay; co-immunoprecipitation; siRNA knockdown; live-cell imaging; Golgi fragmentation assay; rescue experiments with binding-deficient mutants","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro reconstitution plus mutagenesis and cell-based functional assays","pmids":["25821985"],"is_preprint":false},{"year":2015,"finding":"GORAB missense mutations (p.Ala220Pro and p.Ser175Phe) found in gerodermia osteodysplastica patients fall within an internal IGRAB domain that binds both RAB6 and ARF5; RAB6 and ARF5 bind GORAB via the same domain; p.Ala220Pro abolishes interaction with both RAB6 and ARF5 and causes cytoplasmic mislocalization; p.Ser175Phe selectively impairs ARF5 binding and displaces GORAB to vesicular structures.","method":"Yeast two-hybrid; co-immunoprecipitation; immunofluorescence; mutagenesis with Golgi targeting assay","journal":"The Journal of investigative dermatology","confidence":"High","confidence_rationale":"Tier 2 — yeast two-hybrid plus co-IP plus mutagenesis with disease-relevant variants","pmids":["26000619"],"is_preprint":false},{"year":2015,"finding":"BICD2 is a cytosolic factor required for Golgi targeting of Rab6A; BICD2 stabilizes GTP-bound Rab6A on Golgi membranes (FRAP shows reduced Rab6A exchange rate when BICD2 C-terminus is overexpressed); Rab6A and BICD2 are required for Golgi tubule fusion with ER in BFA-treated cells, confirming a role in COPI-independent Golgi-to-ER retrograde transport.","method":"Reconstitution of Golgi targeting in SLO-permeabilized HeLa cells; FRAP; BICD2 knockdown; BFA-induced Golgi-ER fusion assay","journal":"Biochimica et biophysica acta","confidence":"High","confidence_rationale":"Tier 2 — cell-free reconstitution plus FRAP and functional vesicular transport assay","pmids":["25962623"],"is_preprint":false},{"year":2015,"finding":"RAB6A knockout mice die at an early stage of embryonic development, establishing RAB6A as an essential gene; Rab6-depleted MEFs show altered Golgi morphology, reduced Golgi-associated levels of Bicaudal-D and myosin II, delayed VSV-G secretion, protection against ricin toxicity, and impaired cell growth.","method":"Conditional knockout mouse; 4-OHT-induced Cre-mediated deletion in MEFs; immunofluorescence; secretion assays; toxin sensitivity","journal":"Biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — clean genetic knockout with multiple phenotypic readouts","pmids":["26304202"],"is_preprint":false},{"year":2017,"finding":"In melanocytes, the secretory pathway relies on RAB6 and its effector ELKS to directly transport and dock Golgi-derived carriers to melanosomes, delivering MART-1 and TYRP2/DCT cargo; this RAB6/ELKS-dependent pathway controls melanosome formation, maturation, and pigment synthesis; RAB6 KO mice display pigmentation defects.","method":"Live-cell imaging; siRNA knockdown; RAB6 KO mice; co-immunoprecipitation; cargo tracking to melanosomes","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — live imaging plus in vivo KO mouse validation with molecular cargo tracking","pmids":["28607494"],"is_preprint":false},{"year":2018,"finding":"Rab6-dependent retrograde traffic of the LAT adapter from the plasma membrane through the Golgi-TGN controls TCR stimulation and immune synapse formation; this retrograde transport of LAT also depends on Syntaxin-16; in vivo Rab6 KO CD4+ T cells show impaired TCR stimulation.","method":"siRNA/shRNA knockdown in human cells; Rab6 KO mouse T cells; immunofluorescence; TCR stimulation assays; in vivo T cell activation","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 — in vitro RNAi plus in vivo KO mouse with defined signaling readout","pmids":["29440364"],"is_preprint":false},{"year":2019,"finding":"RAB6-positive post-Golgi carriers are the dominant class of secretory carriers regardless of cargo; RAB6 inactivation leads to broad reduction of protein secretion; exocytosis occurs at localized hotspots juxtaposed to focal adhesions, and the RAB6-dependent machinery plays an essential role in this spatial restriction.","method":"Synchronized secretion assay (RUSH system); live-cell imaging; RAB6 siRNA; tracking of multiple cargo types","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — synchronized secretion assay with multiple cargos and spatial resolution","pmids":["31142554"],"is_preprint":false},{"year":2020,"finding":"In presynaptic nerve terminals, ELKS1 (a stationary presynaptic protein with Golgin homology) captures Rab6-marked vesicular cargo via direct Rab6 binding; this capturing mechanism can be transferred to mitochondria by mistargeting ELKS1 or Rab6; ELKS1 and Rab6 KO experiments establish the capturing function.","method":"Knockout and rescue experiments for ELKS1 and Rab6; live-cell imaging in neurons; mistargeting experiments to mitochondria; co-immunoprecipitation","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — genetic KO plus rescue and mechanistic mistargeting experiment","pmids":["32521280"],"is_preprint":false},{"year":2021,"finding":"Newly synthesized TrkB receptors traffic through the secretory pathway in Rab6-positive carriers; combined activity of kinesin-1 and kinesin-3 is required for the formation and processive anterograde transport of Rab6/TrkB axonal carriers; Rab6 regulates TrkB anterograde delivery into the axon.","method":"Microfluidic compartmental devices; inducible secretion assay (RUSH); live-cell imaging; siRNA knockdown of kinesins; hippocampal neuron cultures","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 — inducible secretion system plus kinesin knockdown with cargo tracking","pmids":["33571451"],"is_preprint":false},{"year":2022,"finding":"RAB6A/A' and RAB6B double knockout impairs apical localization of CRB3 in apical radial glia cells and induces delamination and ectopic division; post-Golgi transport of RAB6+ vesicles occurs toward microtubule minus-ends and depends on dynein; dynein activator LIS1 knockout phenocopies RAB6 double KO; identifying a RAB6-dynein-LIS1 complex for Golgi-to-apical surface transport.","method":"In situ subcellular live imaging in developing neocortex; conditional double knockout; CRB3 localization assay; dynein inhibition; LIS1 knockout","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 — genetic double KO with live imaging in vivo and epistasis with dynein/LIS1","pmids":["35979738"],"is_preprint":false},{"year":1999,"finding":"Rab6 phosphorylation is induced in platelets by thrombin or phorbol esters via a PKC-dependent mechanism (blocked by Ro-31-8220); PKC phosphorylation of Rab6C increases GTP affinity ~3-fold and triggers translocation of Rab6 from platelet particulate fractions to cytosol, suggesting phosphorylation modulates Rab6 membrane association and functional interactions in vesicle trafficking.","method":"32P metabolic labeling; PKC inhibitor studies; subcellular fractionation; in vitro phosphorylation and nucleotide binding assays with recombinant Rab6C","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro phosphorylation and binding assays with physiological platelet stimulation and defined kinase","pmids":["10455022"],"is_preprint":false}],"current_model":"RAB6A is a Golgi-associated small GTPase that in its GTP-bound form recruits multiple effectors—including kinesin motors (Rabkinesin-6/KIF20A, kinesin-1, KIF1C), dynein/dynactin (via DYNLRB1 and p150Glued/BicaudalD), golgins (TMF, GORAB, golgin-245, golgin-97, COH1), and the cortical factor ELKS—to coordinate: (1) COPI-independent, microtubule-dependent retrograde transport from Golgi to ER; (2) retrograde endosome-to-TGN transport (predominantly via the Rab6A' isoform); (3) constitutive anterograde secretory vesicle transport to the plasma membrane at focal adhesion hotspots; and (4) Golgi homeostasis and cisternal organization; while its GTPase cycle is regulated by the GEF complex Ric1/Rgp1 and the GAP GAPCenA, and its membrane association depends on geranylgeranylation and GDI."},"narrative":{"teleology":[{"year":1994,"claim":"The first functional role for Rab6 was established as a regulator of intra-Golgi transport between cis/medial and trans compartments, resolving which trafficking step this GTPase controls.","evidence":"Overexpression of GTP-locked (Q72L) and GDP-locked (T27N) Rab6 mutants in HeLa and L cells with SEAP and HA transport assays","pmids":["7798313"],"confidence":"High","gaps":["Directionality (anterograde vs retrograde) not yet resolved","Effector proteins unknown","Whether Rab6 acts directly or indirectly on membrane fusion unresolved"]},{"year":1994,"claim":"The membrane targeting mechanism of Rab6 was defined: geranylgeranylation at the C-terminal CXC motif and N-terminal effector domain sequences are required for Golgi localization and GDI-mediated membrane extraction, establishing the lipid modification and structural determinants of Rab6 cycling.","evidence":"Chimeric Ras-Rab proteins, C-terminal lipid modification mutants, in vitro GDI extraction assays, and yeast complementation","pmids":["8264642","8175798"],"confidence":"High","gaps":["Structural basis for GDI-Rab6 interaction not determined","How effector domain contributes to both GDI binding and Golgi targeting not mechanistically separated"]},{"year":1997,"claim":"Rab6 was shown to drive a microtubule-dependent Golgi-to-ER retrograde transport pathway distinct from COPI-mediated transport, fundamentally redefining Rab6 as a retrograde trafficking regulator rather than solely an intra-Golgi factor.","evidence":"GTP-locked Rab6 overexpression redistributed trans-Golgi markers to ER in HeLa cells; microtubule depolymerization blocked the effect; live imaging showed COPI exclusion from Rab6 carriers","pmids":["9050864","10562278"],"confidence":"High","gaps":["Motor proteins responsible for microtubule-dependent movement not yet identified","Cargo selectivity of the COPI-independent pathway undefined"]},{"year":1998,"claim":"Identification of Rabkinesin-6 (KIF20A) as the first Rab6 effector provided a direct molecular link between Rab6 and motor-dependent transport, answering how Rab6 drives microtubule-based vesicle movement.","evidence":"Two-hybrid screen, co-immunoprecipitation, and dominant-negative inhibition of Rab6-dependent transport by KIF20A C-terminus","pmids":["9438855"],"confidence":"High","gaps":["Whether KIF20A is the motor for Golgi-to-ER transport or has other roles (e.g., mitosis) not separated","Other effectors likely exist"]},{"year":1999,"claim":"Discovery of GAPCenA as a Rab6-specific GAP and golgin-245/97 as Rab6-binding tethering factors established the regulatory and structural framework for Rab6-dependent Golgi trafficking.","evidence":"In vitro GAP assays showing specificity for Rab6; protein blot binding and mutagenesis linking golgin Golgi targeting to Rab6 interaction","pmids":["10202141","10209123"],"confidence":"High","gaps":["GEF for Rab6 not yet identified","Functional consequence of golgin-Rab6 binding on vesicle tethering not directly tested"]},{"year":2000,"claim":"Cloning of the Rab6A' splice isoform revealed that a single amino acid difference (position 87) uncouples Rab6A from Rab6A' effector binding and Golgi-to-ER transport function, establishing isoform-specific roles from a single gene.","evidence":"Molecular cloning showing 3-amino-acid difference; yeast two-hybrid demonstrating loss of Rabkinesin-6 binding by Rab6A'; overexpression failing to redistribute Golgi markers to ER","pmids":["11071909"],"confidence":"High","gaps":["Rab6A'-specific effectors not yet identified","Whether Rab6A' has distinct trafficking functions unknown at this point"]},{"year":2002,"claim":"Rab6A' was assigned to a distinct retrograde pathway—early/recycling endosome-to-TGN transport—working with specific SNARE complexes, while Rab6A was confirmed in Golgi-to-ER transport; dynactin was identified as a Rab6-specific Golgi membrane recruitment target, resolving how Rab6 engages the minus-end-directed motor machinery.","evidence":"Permeabilized cell transport assay with SNARE identification for Rab6A'; pulldown and membrane recruitment assays showing Rab6-specific dynactin binding","pmids":["11839770","12401177"],"confidence":"High","gaps":["How Rab6 coordinates dynactin versus golgin tethering not resolved","Whether dynactin recruitment is sufficient for retrograde transport or requires additional factors"]},{"year":2006,"claim":"Rab6A' was found to have a cell-cycle-specific role: its depletion arrests cells in metaphase by activating the Mad2 spindle checkpoint, with p150Glued retained at kinetochores, revealing an unexpected mitotic function for a Golgi Rab.","evidence":"Isoform-specific siRNA; time-lapse imaging of mitotic arrest; immunofluorescence for checkpoint markers; epistasis with GAPCenA","pmids":["16395330","16536738"],"confidence":"High","gaps":["How Rab6A' regulates dynein/dynactin at kinetochores mechanistically unclear","Whether mitotic and trafficking functions are fully separable at the molecular level"]},{"year":2007,"claim":"Rab6 was shown to control anterograde exocytotic transport by marking secretory vesicles that move processively to the cell periphery via kinesin-1 and dock at ELKS-enriched plasma membrane sites, establishing Rab6 as a bidirectional trafficking coordinator.","evidence":"Live-cell imaging; siRNA; co-immunoprecipitation identifying ELKS as Rab6 effector; vesicle motility assays","pmids":["17681140"],"confidence":"High","gaps":["How Rab6 switches between retrograde and anterograde effector engagement unknown","Cargo selectivity of anterograde Rab6 carriers undefined"]},{"year":2008,"claim":"Biophysical characterization of Rab6a-effector interactions (BicaudalD2, p150Glued, PIST) and identification of DYNLRB1 as a direct dynein-Rab6 link established the quantitative and structural basis for effector recognition and motor complex assembly.","evidence":"ITC, fluorescence kinetics, and GTPase assays for effector binding; yeast two-hybrid and co-IP for DYNLRB1 across all isoforms","pmids":["19019823","18044744"],"confidence":"High","gaps":["How multiple effectors compete or cooperate on the same Rab6-positive membrane not resolved","Crystal structure with dynein components lacking"]},{"year":2009,"claim":"The crystal structure of Rab6a-GTP bound to the RUN domain of Rab6IP1 revealed how conformational flexibility in Rab6's hydrophobic triad enables recognition of structurally distinct effectors, providing a structural explanation for effector diversity.","evidence":"X-ray crystallography at 3.2 Å resolution; comparison with Rab6-GCC185 complex structure","pmids":["19141279"],"confidence":"High","gaps":["Structures with motor effectors (kinesins, dynactin) not available","How effector switching is regulated in vivo remains unknown"]},{"year":2012,"claim":"Identification of Ric1/Rgp1 as the Rab6A GEF, activated downstream of Rab33B, completed the core GTPase cycle machinery and revealed a Rab cascade linking medial and trans-Golgi compartments.","evidence":"In vitro nucleotide exchange assay; co-IP of Rab33B-GTP with Ric1; siRNA causing loss of Rab6 and blocked mannose-6-phosphate receptor transport","pmids":["23091056"],"confidence":"High","gaps":["Structural basis for Ric1/Rgp1 catalytic mechanism unknown","Whether other GEFs exist for Rab6 in specific cell types not addressed"]},{"year":2015,"claim":"RAB6A knockout mice established RAB6A as an essential gene required for embryonic development; MEF analysis confirmed roles in Golgi morphology, secretion, and toxin sensitivity, validating decades of overexpression and RNAi studies.","evidence":"Conditional knockout mouse; 4-OHT-induced Cre deletion in MEFs; multiple phenotypic readouts (Golgi morphology, VSV-G secretion, ricin resistance)","pmids":["26304202"],"confidence":"High","gaps":["Tissue-specific requirements not fully explored","Relative contributions of Rab6A vs Rab6A' in vivo not genetically separated in this study"]},{"year":2017,"claim":"Cell-type-specific functions of RAB6 were demonstrated in melanocytes, where RAB6/ELKS-dependent carriers deliver cargo directly to melanosomes rather than the plasma membrane, and in T cells, where Rab6-dependent retrograde transport of LAT controls TCR signaling and immune synapse formation.","evidence":"Live imaging and Rab6 KO mice showing pigmentation defects; siRNA and Rab6 KO T cells with impaired TCR stimulation and LAT mislocalization","pmids":["28607494","29440364"],"confidence":"High","gaps":["How ELKS discriminates melanosome versus plasma membrane targeting unknown","Whether other immune signaling adaptors use Rab6 retrograde transport not tested"]},{"year":2019,"claim":"A comprehensive secretion study established that RAB6-positive carriers are the dominant class of post-Golgi secretory carriers for diverse cargos, and that exocytosis occurs at spatially restricted hotspots near focal adhesions.","evidence":"RUSH synchronized secretion assay tracking multiple cargo types; RAB6 siRNA; live-cell imaging with spatial analysis","pmids":["31142554"],"confidence":"High","gaps":["Molecular mechanism linking focal adhesions to exocytic hotspots not defined","Whether all cell types use focal adhesion-proximal secretion sites unknown"]},{"year":2022,"claim":"In developing neocortex, RAB6A/A' and RAB6B double knockout demonstrated that RAB6-dynein-LIS1 complexes transport vesicles to the apical surface of radial glia, and this transport is essential for CRB3 polarization and proper cortical development.","evidence":"In situ live imaging in developing neocortex; conditional double KO; epistasis with LIS1 KO","pmids":["35979738"],"confidence":"High","gaps":["Whether RAB6 directly activates dynein via LIS1 or acts in parallel unknown","Cargo selectivity of apical-directed RAB6 carriers in neural progenitors not fully defined"]},{"year":null,"claim":"Major open questions remain: how Rab6 switches between retrograde and anterograde effectors on the same membrane, the structural basis for effector competition and motor coordination, whether tissue-specific GEFs or GAPs diversify Rab6 function, and the precise mechanism coupling Rab6 exocytosis to focal adhesion hotspots.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model for Rab6 engaged with motor complexes (dynein or kinesin-1) on membranes","Mechanism of effector switching or handoff between retrograde and anterograde motors unresolved","No systematic identification of tissue-specific Rab6 regulators"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003924","term_label":"GTPase activity","supporting_discovery_ids":[0,5,8,15,26]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[13,20,29,40]}],"localization":[{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[0,1,5,9,15,31]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[7,20,40,42]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[2,3]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[5,7,12,16,20,31,40]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[0,7,32,40,42]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[11,18,19]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[28,43]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[39]}],"complexes":[],"partners":["BICD2","DCTN1","DYNLRB1","KIF20A","KIF1C","ELKS","GORAB","TMF1"],"other_free_text":[]},"mechanistic_narrative":"RAB6A is a Golgi-associated small GTPase essential for multiple membrane trafficking pathways, including COPI-independent retrograde transport from Golgi to ER, retrograde endosome-to-TGN transport (primarily via the Rab6A' splice isoform), and anterograde secretory vesicle delivery to the plasma membrane at focal adhesion-associated hotspots [PMID:7798313, PMID:10562278, PMID:31142554]. In its GTP-bound form, RAB6A recruits a diverse array of effectors—kinesin motors (KIF20A, kinesin-1, KIF1C), the dynein/dynactin complex (via DYNLRB1, p150Glued, and BicaudalD2), golgins (TMF, GORAB, golgin-245/97, COH1), and the cortical docking factor ELKS—to coordinate microtubule-dependent vesicle motility, Golgi cisternal organization, and cargo-specific exocytosis including TNF secretion in macrophages, melanosomal cargo delivery, TrkB receptor axonal transport, and LAT recycling for TCR signaling [PMID:9438855, PMID:12401177, PMID:17681140, PMID:28607494, PMID:29440364, PMID:33571451]. Its GTPase cycle is controlled by the Ric1/Rgp1 GEF complex and the GAP GAPCenA, while membrane targeting depends on C-terminal geranylgeranylation and GDI-mediated cytosol–membrane cycling; the Rab6A' isoform additionally regulates mitotic progression through dynein/dynactin dynamics at kinetochores [PMID:23091056, PMID:10202141, PMID:8264642, PMID:16395330]. Loss-of-function mutations in the RAB6 effector GORAB (SCYL1BP1) cause gerodermia osteodysplastica, a connective tissue disorder linked to disrupted RAB6-dependent Golgi function [PMID:18997784, PMID:26000619]."},"prefetch_data":{"uniprot":{"accession":"P20340","full_name":"Ras-related protein Rab-6A","aliases":[],"length_aa":208,"mass_kda":23.6,"function":"The small GTPases Rab are key regulators of intracellular membrane trafficking, from the formation of transport vesicles to their fusion with membranes (PubMed:25962623). Rabs cycle between an inactive GDP-bound form and an active GTP-bound form that is able to recruit to membranes different sets of downstream effectors directly responsible for vesicle formation, movement, tethering and fusion (PubMed:25962623). RAB6A acts as a regulator of COPI-independent retrograde transport from the Golgi apparatus towards the endoplasmic reticulum (ER) (PubMed:25962623). Has a low GTPase activity (PubMed:25962623). Recruits VPS13B to the Golgi membrane (PubMed:25492866). Plays a role in neuron projection development (Probable)","subcellular_location":"Golgi apparatus membrane","url":"https://www.uniprot.org/uniprotkb/P20340/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RAB6A","classification":"Not Classified","n_dependent_lines":607,"n_total_lines":1208,"dependency_fraction":0.5024834437086093},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"GDI1","stoichiometry":4.0},{"gene":"GDI2","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/RAB6A","total_profiled":1310},"omim":[{"mim_id":"618761","title":"CATIFA SYNDROME; CATIFA","url":"https://www.omim.org/entry/618761"},{"mim_id":"617278","title":"DENN DOMAIN-CONTAINING PROTEIN 5A; DENND5A","url":"https://www.omim.org/entry/617278"},{"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"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Golgi apparatus","reliability":"Supported"},{"location":"Basal body","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/RAB6A"},"hgnc":{"alias_symbol":[],"prev_symbol":["RAB6"]},"alphafold":{"accession":"P20340","domains":[{"cath_id":"3.40.50.300","chopping":"12-172","consensus_level":"high","plddt":95.4598,"start":12,"end":172}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P20340","model_url":"https://alphafold.ebi.ac.uk/files/AF-P20340-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P20340-F1-predicted_aligned_error_v6.png","plddt_mean":85.19},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RAB6A","jax_strain_url":"https://www.jax.org/strain/search?query=RAB6A"},"sequence":{"accession":"P20340","fasta_url":"https://rest.uniprot.org/uniprotkb/P20340.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P20340/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P20340"}},"corpus_meta":[{"pmid":"11839770","id":"PMC_11839770","title":"Early/recycling endosomes-to-TGN 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overexpression of GTP-bound (Q72L) or wild-type Rab6 blocks transport between these compartments without affecting ER-to-cis/medial Golgi or TGN-to-plasma membrane transport.\",\n      \"method\": \"Transient overexpression of wild-type, GTP-bound (Q72L) and GDP-bound (T27N) mutants in HeLa and L cells; intracellular transport assays with SEAP and influenza HA\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple mutants with defined transport assays, replicated across cell lines\",\n      \"pmids\": [\"7798313\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"Golgi apparatus localization of Rab6 requires geranylgeranylation at its CXC C-terminal motif and sequences within the N-terminal 71 amino acids (including the effector domain); farnesylation alone cannot substitute for geranylgeranylation in Golgi targeting.\",\n      \"method\": \"Chimeric Ras-Rab proteins, C-terminal lipid modification mutants, immunofluorescence, yeast complementation assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis with structure-function analysis and multiple readouts\",\n      \"pmids\": [\"8264642\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"Geranylgeranylation on CXC or CC motifs is required for efficient membrane extraction of Rab6 by RabGDI; the effector domain, loop3/beta3, and hypervariable region of Rab6 are all required for RabGDI binding, while loop3/beta3 and hypervariable region (but not the effector domain) are required for RabGGTase processing.\",\n      \"method\": \"In vitro RabGDI membrane extraction assay with Rab6 mutants carrying various C-terminal lipid modifications; mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro biochemical reconstitution with systematic mutagenesis\",\n      \"pmids\": [\"8175798\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"GDI beta interacts with wild-type Rab6 and Rab5 but not with a GTP-bound Rab6 mutant, and recombinant GDI beta can remove Rab6 (and other Rabs including Rab1, Rab2, Rab4) from membranes.\",\n      \"method\": \"Yeast two-hybrid screen; recombinant GDI beta membrane extraction assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — yeast two-hybrid plus in vitro functional reconstitution\",\n      \"pmids\": [\"7782346\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Rab6 antibodies and a trans-dominant Rab6 mutant (N126I) inhibit transport between cis and medial Golgi cisternae and inhibit fusion of Golgi membranes in a cell-free reconstituted transport system, indicating Rab6 is required for membrane fusion at Golgi cisternal membranes.\",\n      \"method\": \"Reconstituted in vitro Golgi transport assay; inhibition with polyclonal antibodies, Fab fragments, and dominant-negative Rab6 N126I mutant\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with antibody inhibition and dominant-negative mutant\",\n      \"pmids\": [\"8663167\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"GTP-bound Rab6 (Q72L) and wild-type Rab6 overexpression induces microtubule-dependent redistribution of trans-Golgi proteins (beta-1,4-galactosyltransferase) into the ER, phenocopying brefeldin A effects; this retrograde Golgi-to-ER transport requires intact microtubules.\",\n      \"method\": \"Overexpression of wild-type and GTP/GDP mutants of Rab6 in HeLa cells; immunofluorescence and biochemical analyses; microtubule depolymerization experiments\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple mutants, morphological and biochemical readouts, mechanistic link to microtubules\",\n      \"pmids\": [\"9050864\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Rab6 binds specifically to the GTP-bound form of Rab6, and this interaction is mediated by the C-terminal domain of Rabkinesin-6 (KIF20A); Rabkinesin-6 localizes to the Golgi apparatus and its overexpression (C-terminal domain) inhibits Rab6-GTP effects on intracellular transport, identifying a kinesin motor as a Rab6 effector.\",\n      \"method\": \"Two-hybrid screen; co-immunoprecipitation; immunofluorescence localization; dominant-negative overexpression transport assay\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — yeast two-hybrid plus reciprocal pull-down, replicated with functional inhibition assay\",\n      \"pmids\": [\"9438855\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Rab6 regulates a COPI-independent Golgi-to-ER retrograde transport pathway; Rab6-positive transport carriers specifically carry retrograde cargo (Shiga toxin B-fragment) and associate with ER; Rab6:GDP (T27N) overexpression inhibits Shiga holotoxin cytotoxicity without blocking STB transport to the Golgi; COPI markers are excluded from Rab6/STB transport carriers.\",\n      \"method\": \"Live fluorescence imaging of FP-Rab6 with secretory pathway markers; COPI antibody microinjection; vaccinia-T7 overexpression of Rab6 T27N; confocal and time-lapse microscopy\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — live imaging with multiple cargo markers, antibody inhibition, dominant-negative mutant; replicated in multiple labs\",\n      \"pmids\": [\"10562278\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"GAPCenA is a novel GAP specifically active on Rab6 in vitro (and to lesser extent on Rab4 and Rab2); GAPCenA is predominantly cytosolic with a minor pool at the centrosome, forms complexes with gamma-tubulin, and plays a role in microtubule nucleation.\",\n      \"method\": \"In vitro GAP activity assay on recombinant Rab proteins; immunofluorescence; cell fractionation; co-immunoprecipitation with gamma-tubulin\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro enzymatic assay plus localization with co-IP\",\n      \"pmids\": [\"10202141\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Golgins golgin-230/245/256 and golgin-97 target to the Golgi apparatus through a conserved C-terminal domain containing a critical tyrosine residue that preferentially binds Rab6; mutations abolishing Golgi targeting also abolish Rab6 binding, identifying a Rab6-interacting domain defining a family of Golgi-targeted coiled-coil proteins.\",\n      \"method\": \"Protein blot binding assay; mutagenesis; Golgi targeting assays; sequence analysis\",\n      \"journal\": \"Current biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — binding assay combined with mutagenesis and functional targeting assay\",\n      \"pmids\": [\"10209123\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Rab6A and Rab6A' are two distinct isoforms generated by alternative splicing of the RAB6A gene, differing in only 3 amino acids near the PM3 GTP-binding domain; Rab6A' does not bind Rabkinesin-6 (a Rab6A effector) due to a single amino acid difference at position 87 (T vs A), and Rab6A' overexpression does not induce redistribution of Golgi proteins to ER as Rab6A does.\",\n      \"method\": \"Molecular cloning and sequencing of human RAB6A gene; GTP-binding assays; immunofluorescence; yeast two-hybrid interaction with Rabkinesin-6 and GAPCenA; GTP-bound mutant overexpression in HeLa cells\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods, structure-function with single amino acid resolution\",\n      \"pmids\": [\"11071909\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Rab6-KIFL (KIF20A) accumulates in mitotic cells at the spindle midzone during anaphase and at the cleavage furrow and midbody during telophase; microinjection of anti-Rab6-KIFL antibodies causes cytokinesis failure (binucleate cells) by defecting cleavage furrow formation.\",\n      \"method\": \"Immunofluorescence; time-lapse microscopy; microinjection of inhibitory antibodies; overexpression cytokinesis assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — antibody microinjection with time-lapse imaging provides direct functional evidence\",\n      \"pmids\": [\"11060022\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Rab6a' (but not Rab6a) is required for early/recycling endosome-to-TGN retrograde transport, working together with specific SNARE complexes (syntaxin 6, syntaxin 16, Vti1a with VAMP3/cellubrevin or VAMP4); Rab6a has been implicated in Golgi-to-ER transport.\",\n      \"method\": \"Permeabilized cell retrograde transport assay; identification of SNARE interactions; functional depletion/inhibition studies\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — novel permeabilized cell system with functional implication of multiple pathway components\",\n      \"pmids\": [\"11839770\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Dynactin binds specifically to Rab6 (but not to other Golgi Rabs) and shows Rab6-dependent recruitment to Golgi membranes; Rab6 acts as a specificity factor controlling dynactin recruitment to membranes.\",\n      \"method\": \"Pulldown assays; immunofluorescence; Golgi membrane recruitment assay with dominant-negative and active Rab6 mutants\",\n      \"journal\": \"Current biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — pulldown plus functional membrane recruitment assay with specificity controls (other Golgi Rabs)\",\n      \"pmids\": [\"12401177\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Rab6IP2A and Rab6IP2B specifically interact with all three Rab6 isoforms (Rab6A, A', B); they are recruited to Golgi membranes in a Rab6:GTP-dependent manner; overexpression of the Rab6-binding domain of Rab6IP2 inhibits retrograde transport of Shiga toxin B subunit from plasma membrane to Golgi, suggesting Rab6IP2 functions in the Rab6A'-regulated pathway.\",\n      \"method\": \"Yeast two-hybrid screen; Golgi membrane recruitment assay; Shiga toxin retrograde transport assay\",\n      \"journal\": \"Traffic\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — yeast two-hybrid with functional transport inhibition, single lab\",\n      \"pmids\": [\"11929610\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Phage display-derived recombinant antibodies specific to GTP-bound Rab6 revealed that Rab6 is in its GTP-bound conformation on the Golgi apparatus and on transport intermediates; Rab6 GTPase activity modulates the geometry/morphology of transport intermediates.\",\n      \"method\": \"Antibody phage display; intracellular expression of GFP-tagged conformation-specific antibodies; live-cell imaging\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — novel conformation sensor with live imaging; functional link to transport intermediate geometry\",\n      \"pmids\": [\"12738866\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Both Rab6A and Rab6A' GTP-restricted mutants promote microtubule-dependent recycling of Golgi resident glycosylation enzymes to the ER with similar efficiency; this Rab6-directed Golgi-to-ER recycling requires functional dynactin (inhibited by p50/dynamitin overexpression or C-terminal Bicaudal-D fragment), and is initiated from the trans-Golgi network.\",\n      \"method\": \"siRNA knockdown; overexpression of GTP-restricted mutants; live imaging; p50/dynamitin dominant-negative overexpression\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — siRNA plus dominant-negative approach with defined transport assays; epistasis with dynactin\",\n      \"pmids\": [\"15483056\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"TMF/ARA160 is a Golgi golgin that binds to all three Rab6 isoforms; depletion of TMF by RNAi causes modest dispersal of Golgi membranes, indicating a role in Golgi organization.\",\n      \"method\": \"Co-immunoprecipitation; RNAi knockdown; immunofluorescence; sequence-based identification of conserved Rab6-binding motif\",\n      \"journal\": \"BMC cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — Co-IP plus RNAi phenotype, single lab\",\n      \"pmids\": [\"15128430\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Rab6A' (but not Rab6A) is required for cell cycle progression through mitosis; Rab6A' alteration blocks cells in metaphase with the Mad2-spindle checkpoint activated; the Rab6 effector p150(Glued) (dynactin subunit) remains associated with kinetochores; GAPCenA depletion produces a similar phenotype, suggesting Rab6A' regulates dynein/dynactin dynamics at kinetochores for the metaphase/anaphase transition.\",\n      \"method\": \"siRNA knockdown of Rab6A'; time-lapse microscopy; immunofluorescence for spindle checkpoint markers; co-depletion of GAPCenA\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — siRNA with live imaging and molecular mechanism (p150Glued at kinetochores), epistasis with GAPCenA\",\n      \"pmids\": [\"16395330\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Rab6A and Rab6A' perform non-overlapping functions: Rab6A' knockdown (but not Rab6A) hampers retrograde transport of Shiga Toxin B-subunit and causes defects in Golgi-associated protein recycling through the ER; Rab6A' is required for cell cycle progression through mitosis; Ile62 is a key residue uncoupling Rab6A' functions in mitosis versus retrograde trafficking.\",\n      \"method\": \"siRNA with isoform-specific oligonucleotides; Shiga Toxin B retrograde transport assay; cell cycle analysis; mutagenesis of Ile62\",\n      \"journal\": \"Traffic\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — isoform-specific siRNA with multiple functional readouts, mutagenesis\",\n      \"pmids\": [\"16536738\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Rab6 marks exocytotic vesicles and, together with kinesin-1, stimulates processive microtubule-based transport to the cell periphery; Rab6 directs targeting of secretory vesicles to plasma-membrane sites enriched in the cortical protein ELKS.\",\n      \"method\": \"Live-cell imaging; siRNA knockdown; co-immunoprecipitation; identification of ELKS as Rab6 effector; vesicle motility assays\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — live imaging plus siRNA with defined cargo, identification of effector ELKS\",\n      \"pmids\": [\"17681140\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"TMF/ARA160 knockdown blocks retrograde transport of Shiga toxin from early/recycling endosomes to TGN and causes Rab6-dependent displacement of GalNAc-T2 (but not GalT) from the Golgi; the cytoplasmic region of GalNAc-T2 is critical for TMF-dependent Golgi retention.\",\n      \"method\": \"RNAi knockdown of TMF and Rab6; Shiga toxin retrograde transport assay; immunofluorescence; chimeric protein analysis\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — RNAi epistasis with transport assay and chimeric protein mechanistic follow-up\",\n      \"pmids\": [\"17698061\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Rab6 regulates two distinct retrograde Golgi trafficking pathways involving ZW10/RINT-1 and COG complexes; epistatic Rab6 depletion suppresses Golgi disruption caused by ZW10/RINT-1 or COG inactivation; BicaudalD C-terminal fragment (linking Rab6 to dynactin/dynein) suppresses ZW10 but not COG knockdown-induced disruption.\",\n      \"method\": \"siRNA epistasis experiments; dominant-negative Rab6 and BicaudalD expression; immunofluorescence; multiple depletion combinations\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — systematic epistasis with multiple pathway components, multiple orthogonal approaches\",\n      \"pmids\": [\"17699596\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Rab6-interacting protein 1 (R6IP1) binds both Rab6 (GTP-bound) and Rab11A (GTP-bound); R6IP1 is targeted to the Golgi in a Rab6-dependent manner; overexpression of R6IP1 promotes Rab11A–Rab6 interaction (detected by FRET/FLIM) and accumulates recycling endosomes in the pericentriolar area; R6IP1 function is required during metaphase and cytokinesis.\",\n      \"method\": \"Co-immunoprecipitation; FRET/FLIM in live cells; subcellular localization; dominant-negative and siRNA experiments; cell cycle analysis\",\n      \"journal\": \"Traffic\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — FRET/FLIM plus co-IP, functional siRNA knockdown with cell cycle readout\",\n      \"pmids\": [\"17725553\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Rab6 GTPase interacts with gerodermia osteodysplastica protein SCYL1BP1 (GORAB); GORAB localizes to the Golgi apparatus; loss-of-function mutations in SCYL1BP1 cause gerodermia osteodysplastica, linking Rab6-associated secretory pathway abnormalities to this connective tissue disorder.\",\n      \"method\": \"Identification of disease mutations; co-localization studies; protein interaction assay\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — disease gene identification with Golgi localization; interaction with Rab6 demonstrated but mechanism not fully biochemically characterized in this paper\",\n      \"pmids\": [\"18997784\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"DYNLRB1 (dynein light chain) specifically interacts with all three Rab6 isoforms; DYNLRB1 shows preferred association with GTP-bound Rab6A and GDP-bound Rab6A'/Rab6B; DYNLRB1 co-localizes with Rab6 at the Golgi apparatus, representing the first direct interaction between Rab6 and the dynein complex.\",\n      \"method\": \"Yeast two-hybrid; co-immunoprecipitation; pulldown assays; immunofluorescence co-localization\",\n      \"journal\": \"Cell motility and the cytoskeleton\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — yeast two-hybrid plus reciprocal co-IP and pulldown across isoforms\",\n      \"pmids\": [\"18044744\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Rab6a interacts with effectors BicaudalD2, p150(Glued), and PIST through their coiled-coil domains; all three bind GTP-bound Rab6a with Kd in high nanomolar to low micromolar range; BicaudalD2 and p150 binding moderately inhibits Rab6a intrinsic GTPase activity; effectors display rapid on- and off-rates (single-step binding kinetics).\",\n      \"method\": \"In vitro binding/biophysical assays (ITC, fluorescence); GTPase activity assays; transient kinetic analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — rigorous in vitro biophysical characterization with multiple effectors and kinetic analysis\",\n      \"pmids\": [\"19019823\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Crystal structure of Rab6a-GTP in complex with a 378-residue fragment of Rab6IP1 was solved at 3.2 Å; the first and last alpha-helices of the RUN domain of Rab6IP1 mediate binding to switch I, switch II, and interswitch region of Rab6; comparison with GCC185 complex reveals conformational flexibility in Rab6's hydrophobic triad mediates recognition of distinct effectors.\",\n      \"method\": \"X-ray crystallography; structural comparison with Rab6-GCC185 complex\",\n      \"journal\": \"Structure\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure at 3.2 Å with structural validation and comparison\",\n      \"pmids\": [\"19141279\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"BICDR-1 is a Rab6 effector that interacts with kinesin Kif1C and the dynein/dynactin complex; BICDR-1 regulates pericentrosomal localization of Rab6-positive secretory vesicles and restricts anterograde secretory transport, inhibiting neuritogenesis in early neuronal development; BICDR-1 is required for neural development in zebrafish.\",\n      \"method\": \"Co-immunoprecipitation; live-cell imaging; siRNA knockdown; zebrafish knockdown; fluorescence microscopy\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — co-IP, live imaging, in vivo zebrafish validation; multiple orthogonal methods\",\n      \"pmids\": [\"20360680\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Rab8A stably associates with exocytotic vesicles in a Rab6-dependent manner; Rab8A is required for docking and fusion of exocytotic carriers (not for budding or motility); Rab8A and ELKS act in the same pathway; MICAL3 links Rab8A and ELKS, and its monooxygenase activity is required for its own turnover and remodeling of vesicle-docking protein complexes.\",\n      \"method\": \"Live-cell imaging; siRNA knockdown; co-immunoprecipitation; dominant-negative MICAL3 expression; vesicle tracking\",\n      \"journal\": \"Current biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — live imaging with siRNA and dominant-negative, multiple markers, defined pathway\",\n      \"pmids\": [\"21596566\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Human Ric1 and Rgp1 form a complex that acts as the guanine nucleotide exchange factor (GEF) for Rab6A, binding preferentially to GDP-bound Rab6A and catalyzing nucleotide exchange; Rab33B-GTP binds Ric1 at a distinct site, linking medial and late Golgi Rab proteins in a cascade; loss of Ric1 or Rgp1 destabilizes Rab6 and blocks Rab6-dependent retrograde transport of mannose-6-phosphate receptors.\",\n      \"method\": \"In vitro GEF nucleotide exchange assay; co-immunoprecipitation; siRNA knockdown with transport assay; binding assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro GEF assay plus siRNA functional validation and epistasis\",\n      \"pmids\": [\"23091056\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Rab6 depletion by electron tomography reveals accumulation of two classes of coated vesicles (clathrin-coated and COPI-coated) at the trans-Golgi/TGN and a >50% increase in Golgi cisternal number; Rab6 is essential for trafficking of these vesicles, and Golgi-to-cell-surface transport is delayed.\",\n      \"method\": \"Electron tomography; siRNA knockdown; electron microscopy; VSV-G cargo transport kinetics\",\n      \"journal\": \"Traffic\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — high-resolution unbiased ultrastructural analysis plus functional cargo transport assay\",\n      \"pmids\": [\"22335553\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Rab6 depletion reduces TNF delivery to the cell surface in macrophages; Rab6-GFP localizes on TGN-derived tubular carriers marked by golgin p230; Rab6 depletion and inactive mutants alter tubular carrier egress and reduce p230 membrane association, suggesting Rab6 stabilizes p230 on tubular carriers to facilitate TNF transport.\",\n      \"method\": \"siRNA/shRNA knockdown; live-cell imaging; dominant-negative mutants; electron microscopy; TNF secretion ELISA\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — siRNA with live imaging, ultrastructural analysis, and functional secretion assay\",\n      \"pmids\": [\"23437303\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"COH1 (VPS13B) association with the Golgi complex depends on Rab6; RAB6A/A' knockdown prevents COH1 Golgi localization; constitutively active RAB6_Q72L preferentially co-immunoprecipitates with COH1, identifying COH1 as a RAB6 effector; COH1 depletion in neurons impairs neurite outgrowth.\",\n      \"method\": \"RNAi knockdown of RAB6A/A'; co-immunoprecipitation with active/inactive RAB6 mutants; membrane solubilization; primary neuron knockdown with morphological readout\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP with mutants, RNAi epistasis, functional neuronal assay\",\n      \"pmids\": [\"25492866\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"KIF1C transports Rab6A-positive vesicles and can influence Golgi organization; KIF1C binds Rab6A directly both via its motor domain and C-terminus; Rab6A binding to the KIF1C motor domain inhibits microtubule interaction in vitro and in cells, decreasing the amount of motile KIF1C; KIF1C depletion slows protein delivery to the cell surface and causes Golgi fragmentation; KIF1C can protect Golgi membranes from fragmentation in the absence of an intact microtubule network, requiring both Rab6A-binding sites.\",\n      \"method\": \"In vitro microtubule binding assay; co-immunoprecipitation; siRNA knockdown; live-cell imaging; Golgi fragmentation assay; rescue experiments with binding-deficient mutants\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro reconstitution plus mutagenesis and cell-based functional assays\",\n      \"pmids\": [\"25821985\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"GORAB missense mutations (p.Ala220Pro and p.Ser175Phe) found in gerodermia osteodysplastica patients fall within an internal IGRAB domain that binds both RAB6 and ARF5; RAB6 and ARF5 bind GORAB via the same domain; p.Ala220Pro abolishes interaction with both RAB6 and ARF5 and causes cytoplasmic mislocalization; p.Ser175Phe selectively impairs ARF5 binding and displaces GORAB to vesicular structures.\",\n      \"method\": \"Yeast two-hybrid; co-immunoprecipitation; immunofluorescence; mutagenesis with Golgi targeting assay\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — yeast two-hybrid plus co-IP plus mutagenesis with disease-relevant variants\",\n      \"pmids\": [\"26000619\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"BICD2 is a cytosolic factor required for Golgi targeting of Rab6A; BICD2 stabilizes GTP-bound Rab6A on Golgi membranes (FRAP shows reduced Rab6A exchange rate when BICD2 C-terminus is overexpressed); Rab6A and BICD2 are required for Golgi tubule fusion with ER in BFA-treated cells, confirming a role in COPI-independent Golgi-to-ER retrograde transport.\",\n      \"method\": \"Reconstitution of Golgi targeting in SLO-permeabilized HeLa cells; FRAP; BICD2 knockdown; BFA-induced Golgi-ER fusion assay\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-free reconstitution plus FRAP and functional vesicular transport assay\",\n      \"pmids\": [\"25962623\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"RAB6A knockout mice die at an early stage of embryonic development, establishing RAB6A as an essential gene; Rab6-depleted MEFs show altered Golgi morphology, reduced Golgi-associated levels of Bicaudal-D and myosin II, delayed VSV-G secretion, protection against ricin toxicity, and impaired cell growth.\",\n      \"method\": \"Conditional knockout mouse; 4-OHT-induced Cre-mediated deletion in MEFs; immunofluorescence; secretion assays; toxin sensitivity\",\n      \"journal\": \"Biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean genetic knockout with multiple phenotypic readouts\",\n      \"pmids\": [\"26304202\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In melanocytes, the secretory pathway relies on RAB6 and its effector ELKS to directly transport and dock Golgi-derived carriers to melanosomes, delivering MART-1 and TYRP2/DCT cargo; this RAB6/ELKS-dependent pathway controls melanosome formation, maturation, and pigment synthesis; RAB6 KO mice display pigmentation defects.\",\n      \"method\": \"Live-cell imaging; siRNA knockdown; RAB6 KO mice; co-immunoprecipitation; cargo tracking to melanosomes\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — live imaging plus in vivo KO mouse validation with molecular cargo tracking\",\n      \"pmids\": [\"28607494\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Rab6-dependent retrograde traffic of the LAT adapter from the plasma membrane through the Golgi-TGN controls TCR stimulation and immune synapse formation; this retrograde transport of LAT also depends on Syntaxin-16; in vivo Rab6 KO CD4+ T cells show impaired TCR stimulation.\",\n      \"method\": \"siRNA/shRNA knockdown in human cells; Rab6 KO mouse T cells; immunofluorescence; TCR stimulation assays; in vivo T cell activation\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vitro RNAi plus in vivo KO mouse with defined signaling readout\",\n      \"pmids\": [\"29440364\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RAB6-positive post-Golgi carriers are the dominant class of secretory carriers regardless of cargo; RAB6 inactivation leads to broad reduction of protein secretion; exocytosis occurs at localized hotspots juxtaposed to focal adhesions, and the RAB6-dependent machinery plays an essential role in this spatial restriction.\",\n      \"method\": \"Synchronized secretion assay (RUSH system); live-cell imaging; RAB6 siRNA; tracking of multiple cargo types\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — synchronized secretion assay with multiple cargos and spatial resolution\",\n      \"pmids\": [\"31142554\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"In presynaptic nerve terminals, ELKS1 (a stationary presynaptic protein with Golgin homology) captures Rab6-marked vesicular cargo via direct Rab6 binding; this capturing mechanism can be transferred to mitochondria by mistargeting ELKS1 or Rab6; ELKS1 and Rab6 KO experiments establish the capturing function.\",\n      \"method\": \"Knockout and rescue experiments for ELKS1 and Rab6; live-cell imaging in neurons; mistargeting experiments to mitochondria; co-immunoprecipitation\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO plus rescue and mechanistic mistargeting experiment\",\n      \"pmids\": [\"32521280\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Newly synthesized TrkB receptors traffic through the secretory pathway in Rab6-positive carriers; combined activity of kinesin-1 and kinesin-3 is required for the formation and processive anterograde transport of Rab6/TrkB axonal carriers; Rab6 regulates TrkB anterograde delivery into the axon.\",\n      \"method\": \"Microfluidic compartmental devices; inducible secretion assay (RUSH); live-cell imaging; siRNA knockdown of kinesins; hippocampal neuron cultures\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — inducible secretion system plus kinesin knockdown with cargo tracking\",\n      \"pmids\": [\"33571451\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"RAB6A/A' and RAB6B double knockout impairs apical localization of CRB3 in apical radial glia cells and induces delamination and ectopic division; post-Golgi transport of RAB6+ vesicles occurs toward microtubule minus-ends and depends on dynein; dynein activator LIS1 knockout phenocopies RAB6 double KO; identifying a RAB6-dynein-LIS1 complex for Golgi-to-apical surface transport.\",\n      \"method\": \"In situ subcellular live imaging in developing neocortex; conditional double knockout; CRB3 localization assay; dynein inhibition; LIS1 knockout\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic double KO with live imaging in vivo and epistasis with dynein/LIS1\",\n      \"pmids\": [\"35979738\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Rab6 phosphorylation is induced in platelets by thrombin or phorbol esters via a PKC-dependent mechanism (blocked by Ro-31-8220); PKC phosphorylation of Rab6C increases GTP affinity ~3-fold and triggers translocation of Rab6 from platelet particulate fractions to cytosol, suggesting phosphorylation modulates Rab6 membrane association and functional interactions in vesicle trafficking.\",\n      \"method\": \"32P metabolic labeling; PKC inhibitor studies; subcellular fractionation; in vitro phosphorylation and nucleotide binding assays with recombinant Rab6C\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro phosphorylation and binding assays with physiological platelet stimulation and defined kinase\",\n      \"pmids\": [\"10455022\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RAB6A is a Golgi-associated small GTPase that in its GTP-bound form recruits multiple effectors—including kinesin motors (Rabkinesin-6/KIF20A, kinesin-1, KIF1C), dynein/dynactin (via DYNLRB1 and p150Glued/BicaudalD), golgins (TMF, GORAB, golgin-245, golgin-97, COH1), and the cortical factor ELKS—to coordinate: (1) COPI-independent, microtubule-dependent retrograde transport from Golgi to ER; (2) retrograde endosome-to-TGN transport (predominantly via the Rab6A' isoform); (3) constitutive anterograde secretory vesicle transport to the plasma membrane at focal adhesion hotspots; and (4) Golgi homeostasis and cisternal organization; while its GTPase cycle is regulated by the GEF complex Ric1/Rgp1 and the GAP GAPCenA, and its membrane association depends on geranylgeranylation and GDI.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"RAB6A is a Golgi-associated small GTPase essential for multiple membrane trafficking pathways, including COPI-independent retrograde transport from Golgi to ER, retrograde endosome-to-TGN transport (primarily via the Rab6A' splice isoform), and anterograde secretory vesicle delivery to the plasma membrane at focal adhesion-associated hotspots [PMID:7798313, PMID:10562278, PMID:31142554]. In its GTP-bound form, RAB6A recruits a diverse array of effectors—kinesin motors (KIF20A, kinesin-1, KIF1C), the dynein/dynactin complex (via DYNLRB1, p150Glued, and BicaudalD2), golgins (TMF, GORAB, golgin-245/97, COH1), and the cortical docking factor ELKS—to coordinate microtubule-dependent vesicle motility, Golgi cisternal organization, and cargo-specific exocytosis including TNF secretion in macrophages, melanosomal cargo delivery, TrkB receptor axonal transport, and LAT recycling for TCR signaling [PMID:9438855, PMID:12401177, PMID:17681140, PMID:28607494, PMID:29440364, PMID:33571451]. Its GTPase cycle is controlled by the Ric1/Rgp1 GEF complex and the GAP GAPCenA, while membrane targeting depends on C-terminal geranylgeranylation and GDI-mediated cytosol–membrane cycling; the Rab6A' isoform additionally regulates mitotic progression through dynein/dynactin dynamics at kinetochores [PMID:23091056, PMID:10202141, PMID:8264642, PMID:16395330]. Loss-of-function mutations in the RAB6 effector GORAB (SCYL1BP1) cause gerodermia osteodysplastica, a connective tissue disorder linked to disrupted RAB6-dependent Golgi function [PMID:18997784, PMID:26000619].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"The first functional role for Rab6 was established as a regulator of intra-Golgi transport between cis/medial and trans compartments, resolving which trafficking step this GTPase controls.\",\n      \"evidence\": \"Overexpression of GTP-locked (Q72L) and GDP-locked (T27N) Rab6 mutants in HeLa and L cells with SEAP and HA transport assays\",\n      \"pmids\": [\"7798313\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Directionality (anterograde vs retrograde) not yet resolved\", \"Effector proteins unknown\", \"Whether Rab6 acts directly or indirectly on membrane fusion unresolved\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"The membrane targeting mechanism of Rab6 was defined: geranylgeranylation at the C-terminal CXC motif and N-terminal effector domain sequences are required for Golgi localization and GDI-mediated membrane extraction, establishing the lipid modification and structural determinants of Rab6 cycling.\",\n      \"evidence\": \"Chimeric Ras-Rab proteins, C-terminal lipid modification mutants, in vitro GDI extraction assays, and yeast complementation\",\n      \"pmids\": [\"8264642\", \"8175798\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for GDI-Rab6 interaction not determined\", \"How effector domain contributes to both GDI binding and Golgi targeting not mechanistically separated\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Rab6 was shown to drive a microtubule-dependent Golgi-to-ER retrograde transport pathway distinct from COPI-mediated transport, fundamentally redefining Rab6 as a retrograde trafficking regulator rather than solely an intra-Golgi factor.\",\n      \"evidence\": \"GTP-locked Rab6 overexpression redistributed trans-Golgi markers to ER in HeLa cells; microtubule depolymerization blocked the effect; live imaging showed COPI exclusion from Rab6 carriers\",\n      \"pmids\": [\"9050864\", \"10562278\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Motor proteins responsible for microtubule-dependent movement not yet identified\", \"Cargo selectivity of the COPI-independent pathway undefined\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Identification of Rabkinesin-6 (KIF20A) as the first Rab6 effector provided a direct molecular link between Rab6 and motor-dependent transport, answering how Rab6 drives microtubule-based vesicle movement.\",\n      \"evidence\": \"Two-hybrid screen, co-immunoprecipitation, and dominant-negative inhibition of Rab6-dependent transport by KIF20A C-terminus\",\n      \"pmids\": [\"9438855\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether KIF20A is the motor for Golgi-to-ER transport or has other roles (e.g., mitosis) not separated\", \"Other effectors likely exist\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Discovery of GAPCenA as a Rab6-specific GAP and golgin-245/97 as Rab6-binding tethering factors established the regulatory and structural framework for Rab6-dependent Golgi trafficking.\",\n      \"evidence\": \"In vitro GAP assays showing specificity for Rab6; protein blot binding and mutagenesis linking golgin Golgi targeting to Rab6 interaction\",\n      \"pmids\": [\"10202141\", \"10209123\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"GEF for Rab6 not yet identified\", \"Functional consequence of golgin-Rab6 binding on vesicle tethering not directly tested\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Cloning of the Rab6A' splice isoform revealed that a single amino acid difference (position 87) uncouples Rab6A from Rab6A' effector binding and Golgi-to-ER transport function, establishing isoform-specific roles from a single gene.\",\n      \"evidence\": \"Molecular cloning showing 3-amino-acid difference; yeast two-hybrid demonstrating loss of Rabkinesin-6 binding by Rab6A'; overexpression failing to redistribute Golgi markers to ER\",\n      \"pmids\": [\"11071909\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Rab6A'-specific effectors not yet identified\", \"Whether Rab6A' has distinct trafficking functions unknown at this point\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Rab6A' was assigned to a distinct retrograde pathway—early/recycling endosome-to-TGN transport—working with specific SNARE complexes, while Rab6A was confirmed in Golgi-to-ER transport; dynactin was identified as a Rab6-specific Golgi membrane recruitment target, resolving how Rab6 engages the minus-end-directed motor machinery.\",\n      \"evidence\": \"Permeabilized cell transport assay with SNARE identification for Rab6A'; pulldown and membrane recruitment assays showing Rab6-specific dynactin binding\",\n      \"pmids\": [\"11839770\", \"12401177\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Rab6 coordinates dynactin versus golgin tethering not resolved\", \"Whether dynactin recruitment is sufficient for retrograde transport or requires additional factors\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Rab6A' was found to have a cell-cycle-specific role: its depletion arrests cells in metaphase by activating the Mad2 spindle checkpoint, with p150Glued retained at kinetochores, revealing an unexpected mitotic function for a Golgi Rab.\",\n      \"evidence\": \"Isoform-specific siRNA; time-lapse imaging of mitotic arrest; immunofluorescence for checkpoint markers; epistasis with GAPCenA\",\n      \"pmids\": [\"16395330\", \"16536738\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Rab6A' regulates dynein/dynactin at kinetochores mechanistically unclear\", \"Whether mitotic and trafficking functions are fully separable at the molecular level\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Rab6 was shown to control anterograde exocytotic transport by marking secretory vesicles that move processively to the cell periphery via kinesin-1 and dock at ELKS-enriched plasma membrane sites, establishing Rab6 as a bidirectional trafficking coordinator.\",\n      \"evidence\": \"Live-cell imaging; siRNA; co-immunoprecipitation identifying ELKS as Rab6 effector; vesicle motility assays\",\n      \"pmids\": [\"17681140\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Rab6 switches between retrograde and anterograde effector engagement unknown\", \"Cargo selectivity of anterograde Rab6 carriers undefined\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Biophysical characterization of Rab6a-effector interactions (BicaudalD2, p150Glued, PIST) and identification of DYNLRB1 as a direct dynein-Rab6 link established the quantitative and structural basis for effector recognition and motor complex assembly.\",\n      \"evidence\": \"ITC, fluorescence kinetics, and GTPase assays for effector binding; yeast two-hybrid and co-IP for DYNLRB1 across all isoforms\",\n      \"pmids\": [\"19019823\", \"18044744\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How multiple effectors compete or cooperate on the same Rab6-positive membrane not resolved\", \"Crystal structure with dynein components lacking\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"The crystal structure of Rab6a-GTP bound to the RUN domain of Rab6IP1 revealed how conformational flexibility in Rab6's hydrophobic triad enables recognition of structurally distinct effectors, providing a structural explanation for effector diversity.\",\n      \"evidence\": \"X-ray crystallography at 3.2 Å resolution; comparison with Rab6-GCC185 complex structure\",\n      \"pmids\": [\"19141279\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structures with motor effectors (kinesins, dynactin) not available\", \"How effector switching is regulated in vivo remains unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identification of Ric1/Rgp1 as the Rab6A GEF, activated downstream of Rab33B, completed the core GTPase cycle machinery and revealed a Rab cascade linking medial and trans-Golgi compartments.\",\n      \"evidence\": \"In vitro nucleotide exchange assay; co-IP of Rab33B-GTP with Ric1; siRNA causing loss of Rab6 and blocked mannose-6-phosphate receptor transport\",\n      \"pmids\": [\"23091056\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for Ric1/Rgp1 catalytic mechanism unknown\", \"Whether other GEFs exist for Rab6 in specific cell types not addressed\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"RAB6A knockout mice established RAB6A as an essential gene required for embryonic development; MEF analysis confirmed roles in Golgi morphology, secretion, and toxin sensitivity, validating decades of overexpression and RNAi studies.\",\n      \"evidence\": \"Conditional knockout mouse; 4-OHT-induced Cre deletion in MEFs; multiple phenotypic readouts (Golgi morphology, VSV-G secretion, ricin resistance)\",\n      \"pmids\": [\"26304202\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific requirements not fully explored\", \"Relative contributions of Rab6A vs Rab6A' in vivo not genetically separated in this study\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Cell-type-specific functions of RAB6 were demonstrated in melanocytes, where RAB6/ELKS-dependent carriers deliver cargo directly to melanosomes rather than the plasma membrane, and in T cells, where Rab6-dependent retrograde transport of LAT controls TCR signaling and immune synapse formation.\",\n      \"evidence\": \"Live imaging and Rab6 KO mice showing pigmentation defects; siRNA and Rab6 KO T cells with impaired TCR stimulation and LAT mislocalization\",\n      \"pmids\": [\"28607494\", \"29440364\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How ELKS discriminates melanosome versus plasma membrane targeting unknown\", \"Whether other immune signaling adaptors use Rab6 retrograde transport not tested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"A comprehensive secretion study established that RAB6-positive carriers are the dominant class of post-Golgi secretory carriers for diverse cargos, and that exocytosis occurs at spatially restricted hotspots near focal adhesions.\",\n      \"evidence\": \"RUSH synchronized secretion assay tracking multiple cargo types; RAB6 siRNA; live-cell imaging with spatial analysis\",\n      \"pmids\": [\"31142554\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism linking focal adhesions to exocytic hotspots not defined\", \"Whether all cell types use focal adhesion-proximal secretion sites unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"In developing neocortex, RAB6A/A' and RAB6B double knockout demonstrated that RAB6-dynein-LIS1 complexes transport vesicles to the apical surface of radial glia, and this transport is essential for CRB3 polarization and proper cortical development.\",\n      \"evidence\": \"In situ live imaging in developing neocortex; conditional double KO; epistasis with LIS1 KO\",\n      \"pmids\": [\"35979738\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether RAB6 directly activates dynein via LIS1 or acts in parallel unknown\", \"Cargo selectivity of apical-directed RAB6 carriers in neural progenitors not fully defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Major open questions remain: how Rab6 switches between retrograde and anterograde effectors on the same membrane, the structural basis for effector competition and motor coordination, whether tissue-specific GEFs or GAPs diversify Rab6 function, and the precise mechanism coupling Rab6 exocytosis to focal adhesion hotspots.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model for Rab6 engaged with motor complexes (dynein or kinesin-1) on membranes\", \"Mechanism of effector switching or handoff between retrograde and anterograde motors unresolved\", \"No systematic identification of tissue-specific Rab6 regulators\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003924\", \"supporting_discovery_ids\": [0, 5, 8, 15, 26]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [13, 20, 29, 40]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [0, 1, 5, 9, 15, 31]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [7, 20, 40, 42]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2, 3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [5, 7, 12, 16, 20, 31, 40]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [0, 7, 32, 40, 42]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [11, 18, 19]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [28, 43]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [39]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"BICD2\",\n      \"DCTN1\",\n      \"DYNLRB1\",\n      \"KIF20A\",\n      \"KIF1C\",\n      \"ELKS\",\n      \"GORAB\",\n      \"TMF1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}