{"gene":"RAB7B","run_date":"2026-04-28T19:45:45","timeline":{"discoveries":[{"year":2004,"finding":"Rab7b is a lysosome-localized small GTPase selectively expressed in monocytes and monocyte-derived dendritic cells, identified by immunofluorescence confocal microscopy to associate with lysosomal organelles.","method":"Immunofluorescence confocal microscopy, Northern blot, RT-PCR, Western blot","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization by immunofluorescence in single study; foundational cloning paper","pmids":["15144907"],"is_preprint":false},{"year":2007,"finding":"Rab7b negatively regulates TLR4 signaling in macrophages by promoting lysosomal degradation of TLR4; Rab7b localizes to LAMP-1-positive compartments and colocalizes with TLR4 after LPS stimulation, decreasing TLR4 protein levels and dampening downstream TNF-α, IL-6, NO, and IFN-β production.","method":"Overexpression and knockdown in macrophages, co-localization by immunofluorescence, Western blot for TLR4 protein levels, cytokine measurement","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (localization, loss/gain-of-function, protein level measurement), replicated in subsequent studies","pmids":["17395780"],"is_preprint":false},{"year":2009,"finding":"Rab7b localizes to late endosome/lysosome compartments, colocalizes with TLR9 in LAMP-1-positive compartments, and promotes TLR9 degradation, thereby negatively regulating TLR9-triggered proinflammatory cytokine and type I IFN production in macrophages. TLR9 ligation inhibits Rab7b expression via ERK and p38 activation.","method":"Overexpression and siRNA knockdown in macrophages, co-localization by immunofluorescence, Western blot, cytokine ELISA, kinase inhibitor assays","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal approaches (localization, gain/loss-of-function, signaling pathway inhibitors) in single study consistent with TLR4 findings","pmids":["19587007"],"is_preprint":false},{"year":2010,"finding":"Rab7b controls retrograde transport from late endosomes to the trans-Golgi network (TGN): GTP-bound (active) Rab7b localizes to the Golgi, while wild-type localizes to lysosomes. Depletion or dominant-negative expression of Rab7b impairs cathepsin-D maturation, causes increased hexosaminidase secretion, alters TGN46 distribution, and disrupts cation-independent mannose-6-phosphate receptor (CI-MPR) trafficking. Cholera toxin B retrograde transport to the Golgi is also blocked by Rab7b depletion.","method":"siRNA knockdown, dominant-negative and constitutively active mutant expression, subcellular fractionation, enzyme activity assays, immunofluorescence, cholera toxin retrograde transport assay","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods across multiple trafficking assays and markers; replicated by subsequent work","pmids":["20375062"],"is_preprint":false},{"year":2010,"finding":"Rab7b promotes PMA-induced megakaryocytic differentiation by activating NF-κB-dependent IL-6 production and subsequently enhancing the association of activated STAT3 with GATA-1.","method":"Overexpression and siRNA knockdown in leukemia cell lines, NF-κB inhibitor, neutralizing antibodies for IL-6/gp130, co-immunoprecipitation for STAT3-GATA-1 association, megakaryocytic marker quantification","journal":"Journal of molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 — gain/loss-of-function with multiple signaling readouts and Co-IP in single study","pmids":["20953574"],"is_preprint":false},{"year":2012,"finding":"Rab7b regulates retrograde transport of both CI-MPR (mannose 6-phosphate-dependent) and sortilin (mannose 6-phosphate-independent sorting receptor); Rab7b directly interacts with sortilin, and expression of Rab7b mutants or silencing reduces CI-MPR and sortilin tubulation from TGN. Constitutively active Rab7b Q67L impairs carrier formation from TGN.","method":"Endosome-to-Golgi retrieval assays, co-immunoprecipitation, siRNA knockdown, mutant expression, live-cell imaging of TGN tubulation","journal":"Traffic","confidence":"High","confidence_rationale":"Tier 2 — interaction validated by Co-IP, functional role confirmed by multiple orthogonal assays","pmids":["22708738"],"is_preprint":false},{"year":2014,"finding":"Rab7b directly interacts with myosin II; myosin II mediates transport of Rab7b-positive endosomes (Rab7b dynamics are disrupted by myosin II depletion or inhibition). Rab7b controls actin remodeling, stress fiber formation, cell adhesion, polarization, and migration by regulating activation of RhoA, which in turn controls myosin light chain phosphorylation.","method":"Co-immunoprecipitation, pulldown, live-cell imaging, myosin II siRNA/inhibitor, RhoA activity assay, myosin light chain phosphorylation Western blot, cell migration and adhesion assays","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1-2 — direct interaction confirmed by pulldown and Co-IP, functional consequences via multiple orthogonal assays","pmids":["25217632"],"is_preprint":false},{"year":2014,"finding":"In platelets, a calpain–myosin-9–Rab7b axis regulates TLR4-containing α-granule trafficking; calpain cleavage of myosin-9 modulates TLR4 expression, with co-immunoprecipitation showing interaction between TLR4 and myosin-9 regulated by calpain.","method":"Co-immunoprecipitation, flow cytometry, Western blot, pharmacological inhibitors (calpeptin, TMB-8), transmission electron microscopy","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2-3 — Co-IP in platelets with inhibitor experiments, but Rab7b mechanistic role less directly established than the calpain-myosin-9 axis","pmids":["24489676"],"is_preprint":false},{"year":2017,"finding":"Rab7b interacts with the autophagy cysteine protease Atg4B; Rab7b and Atg4B co-localize on vesicles. Depletion of Rab7b increases autophagic flux (larger autophagic structures, increased sequestration and degradation). Rab7b negatively regulates autophagy by modulating Atg4B activity and LC3 processing.","method":"Co-immunoprecipitation, co-localization by immunofluorescence, autophagic flux assays (LC3 processing, sequestration assay), siRNA knockdown","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 — interaction validated by Co-IP and co-localization, functional role confirmed by multiple orthogonal autophagic flux assays","pmids":["28835545"],"is_preprint":false},{"year":2018,"finding":"TBC1D5 is a GTPase-activating protein (GAP) for Rab7b that controls the endosomal transport to the TGN; TBC1D5 localizes to Rab7b-positive vesicles, physically interacts with Rab7b, and has GAP activity toward Rab7b in vitro, which is further enhanced by retromer proteins. Inactivation of TBC1D5 phenocopies constitutively active Rab7b by reducing CI-MPR- and sortilin-positive vesicles.","method":"siRNA screen of TBC-domain proteins, in vitro GAP assay, co-immunoprecipitation, co-localization by immunofluorescence, CI-MPR/sortilin vesicle quantification","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro biochemical GAP assay combined with interaction studies and cell-based phenotypic validation","pmids":["30111580"],"is_preprint":false},{"year":2020,"finding":"Rab7b/Rab42 is recruited to melanosome-containing compartments in keratinocytes and promotes protein degradation on melanosomes; knockdown or CRISPR/Cas9 knockout of Rab7B strongly inhibits protein degradation on incorporated melanosomes.","method":"Comprehensive Rab localization screen by fluorescence microscopy, CRISPR/Cas9 knockout, siRNA knockdown, melanosome degradation assay (M-INK probe)","journal":"Cell structure and function","confidence":"High","confidence_rationale":"Tier 2 — quantitative degradation assay with both KD and KO approaches, systematic screen with defined readout","pmids":["32037382"],"is_preprint":false},{"year":2021,"finding":"Rab7b regulates dendritic cell migration by physically linking lysosomes to the actomyosin cytoskeleton; Rab7b directly interacts with the lysosomal Ca²⁺ channel TRPML1 (MCOLN1), enabling local activation of myosin II at the cell rear. Loss of Rab7b reduces myosin II light chain phosphorylation and activation of the transcription factor EB (TFEB), impairing lysosomal signaling required for fast DC migration.","method":"Co-immunoprecipitation (Rab7b–TRPML1 interaction), Rab7b knockout in dendritic cells, 1D and 3D migration assays, myosin light chain phosphorylation Western blot, TFEB activity assay","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — direct interaction validated by Co-IP, functional consequences in multiple migration assays, mechanistic downstream signaling established","pmids":["34494097"],"is_preprint":false},{"year":2023,"finding":"Rab7B negatively regulates oligodendroglial cell morphological differentiation; siRNA knockdown of Rab7B promotes differentiation of FBD-102b oligodendroglial precursor cells and rescues tunicamycin-induced ER-stress-mediated impairment of differentiation.","method":"siRNA knockdown, morphological differentiation assays, Western blot for differentiation/myelination markers, ER stress induction with tunicamycin","journal":"Journal of molecular neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 — loss-of-function with defined cellular and molecular phenotypic readouts in single study","pmids":["37248316"],"is_preprint":false},{"year":2024,"finding":"Rab7B knockdown using CRISPR/CasRx restores incomplete cell shapes induced by PLP1 p.Ala243Val mutation in oligodendroglial cells and promotes trafficking of mutant PLP1 to LAMP1-positive organelles.","method":"CRISPR/CasRx knockdown, morphological differentiation assay, immunofluorescence co-localization of PLP1 with LAMP1","journal":"Neuroscience insights","confidence":"Medium","confidence_rationale":"Tier 2 — specific genetic knockdown with defined morphological and trafficking readouts","pmids":["39280331"],"is_preprint":false}],"current_model":"RAB7B is a lysosome/late endosome-associated small GTPase that mediates retrograde transport from late endosomes to the trans-Golgi network (TGN) — regulated by its GAP TBC1D5 and retromer — and promotes lysosomal degradation of TLR4 and TLR9 to negatively regulate innate immune signaling; it directly interacts with myosin II (controlling actomyosin organization, RhoA activation, and cell migration), with the lysosomal Ca²⁺ channel TRPML1 (linking lysosomes to actomyosin for immune cell migration), and with the autophagy protease Atg4B (negatively regulating autophagic flux and LC3 processing), while also facilitating sorting receptor (CI-MPR, sortilin) trafficking and melanosome protein degradation in keratinocytes."},"narrative":{"teleology":[{"year":2004,"claim":"The initial identification of RAB7B as a lysosome-associated Rab GTPase with restricted expression in monocytic lineage cells established it as a candidate regulator of endolysosomal function in immune cells.","evidence":"Immunofluorescence, Northern blot, and RT-PCR in monocytes and monocyte-derived dendritic cells","pmids":["15144907"],"confidence":"Medium","gaps":["No functional role established","Expression in non-monocytic tissues not assessed","No interacting partners identified"]},{"year":2007,"claim":"The discovery that RAB7B promotes lysosomal degradation of TLR4 and dampens LPS-induced cytokine production defined its first functional role as a negative regulator of innate immune signaling.","evidence":"Overexpression and knockdown in macrophages with TLR4 protein level measurement and cytokine quantification","pmids":["17395780"],"confidence":"High","gaps":["Mechanism by which RAB7B targets TLR4 for degradation unclear","Whether other TLRs are similarly regulated unknown"]},{"year":2009,"claim":"Extension of the TLR degradation role to TLR9 demonstrated that RAB7B is a general negative regulator of endosomal TLR signaling, with a feedback loop whereby TLR9 ligation suppresses RAB7B expression via ERK/p38.","evidence":"Overexpression, siRNA knockdown, cytokine ELISA, and kinase inhibitor assays in macrophages","pmids":["19587007"],"confidence":"High","gaps":["Whether RAB7B regulates other endosomal TLRs (TLR3, TLR7, TLR8) not tested","Structural basis for TLR recognition unknown"]},{"year":2010,"claim":"Demonstration that RAB7B controls retrograde transport from late endosomes to the TGN — affecting CI-MPR trafficking, cathepsin-D maturation, and cholera toxin B retrieval — revealed a fundamental membrane trafficking function beyond immune-specific cargo degradation.","evidence":"siRNA knockdown, dominant-negative/constitutively-active mutants, multiple retrograde transport assays, enzyme activity assays","pmids":["20375062"],"confidence":"High","gaps":["Effector proteins mediating retrograde transport not identified","Relationship between lysosomal and TGN-retrograde functions unresolved"]},{"year":2012,"claim":"The finding that RAB7B also regulates sortilin retrograde trafficking and directly interacts with sortilin broadened its role to both MPR-dependent and MPR-independent sorting receptor pathways and identified its first direct cargo interaction.","evidence":"Co-immunoprecipitation, endosome-to-Golgi retrieval assays, live-cell imaging of TGN tubulation","pmids":["22708738"],"confidence":"High","gaps":["Nature of the Rab7b–sortilin binding interface unknown","Whether other sorting receptors are directly bound not tested"]},{"year":2014,"claim":"Identification of myosin II as a direct RAB7B interactor that transports RAB7B-positive endosomes and mediates RAB7B-dependent RhoA activation, stress fiber formation, and cell migration linked RAB7B to actomyosin cytoskeletal control.","evidence":"Co-immunoprecipitation, pulldown, live-cell imaging, myosin II depletion/inhibition, RhoA and MLC phosphorylation assays, migration assays","pmids":["25217632"],"confidence":"High","gaps":["How RAB7B activates RhoA mechanistically not established","Whether the myosin II interaction is GTP-dependent not fully resolved"]},{"year":2017,"claim":"Discovery of the RAB7B–Atg4B interaction and the demonstration that RAB7B depletion increases autophagic flux established RAB7B as a negative regulator of autophagy acting through modulation of LC3 processing.","evidence":"Co-immunoprecipitation, co-localization, autophagic flux assays including LC3 processing and sequestration assays, siRNA knockdown","pmids":["28835545"],"confidence":"High","gaps":["Whether RAB7B directly inhibits Atg4B enzymatic activity or sequesters it from substrates not distinguished","In vivo relevance of autophagy regulation not tested"]},{"year":2018,"claim":"Identification of TBC1D5 as the GAP for RAB7B, with retromer-enhanced activity, and phenocopy of constitutively active RAB7B by TBC1D5 depletion established the regulatory circuit controlling RAB7B GTPase cycling in endosome-to-TGN transport.","evidence":"In vitro GAP assay, siRNA screen of TBC-domain proteins, co-immunoprecipitation, CI-MPR/sortilin vesicle quantification","pmids":["30111580"],"confidence":"High","gaps":["GEF for RAB7B not identified","Structural basis of TBC1D5–retromer–RAB7B ternary interaction unknown"]},{"year":2020,"claim":"Demonstration that RAB7B is recruited to melanosome-containing compartments in keratinocytes and is required for protein degradation on melanosomes expanded its functional repertoire to pigmentation biology.","evidence":"Systematic Rab localization screen, CRISPR/Cas9 knockout and siRNA knockdown with M-INK melanosome degradation probe","pmids":["32037382"],"confidence":"High","gaps":["Effectors mediating melanosome protein degradation not identified","Relationship to lysosomal fusion machinery unresolved"]},{"year":2021,"claim":"The finding that RAB7B directly interacts with the lysosomal Ca²⁺ channel TRPML1 to locally activate myosin II at the cell rear, enabling fast dendritic cell migration, unified the lysosomal and actomyosin functions into a single mechanistic pathway coupling lysosomal signaling to cell motility.","evidence":"Co-immunoprecipitation of RAB7B–TRPML1, Rab7b knockout dendritic cells, 1D and 3D migration assays, MLC phosphorylation and TFEB activity measurements","pmids":["34494097"],"confidence":"High","gaps":["Whether TRPML1-dependent Ca²⁺ release directly activates myosin II or acts through intermediate kinases not fully resolved","Relevance to in vivo immune cell trafficking not shown"]},{"year":2023,"claim":"RAB7B was shown to negatively regulate oligodendroglial morphological differentiation, with its depletion rescuing ER-stress-impaired differentiation, revealing a role in CNS glial biology.","evidence":"siRNA knockdown in FBD-102b oligodendroglial cells, differentiation markers, tunicamycin-induced ER stress","pmids":["37248316"],"confidence":"Medium","gaps":["Mechanism connecting RAB7B to oligodendrocyte differentiation signaling unknown","Single cell line used","In vivo relevance in myelination not tested"]},{"year":null,"claim":"The GEF activating RAB7B, the structural basis of its interactions with multiple effectors (TRPML1, myosin II, Atg4B, sortilin), and its in vivo roles in immune regulation and myelination remain to be established.","evidence":"","pmids":[],"confidence":"Low","gaps":["No GEF for RAB7B has been identified","No crystal or cryo-EM structure of RAB7B or its effector complexes exists","In vivo knockout phenotype not reported"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003924","term_label":"GTPase activity","supporting_discovery_ids":[3,9]}],"localization":[{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[0,1,2,10,11]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[3,5,9]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[3,5]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[3,5,9]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[1,2,11]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[8]}],"complexes":[],"partners":["MYH9","MCOLN1","ATG4B","SORT1","TBC1D5","TLR4","TLR9"],"other_free_text":[]},"mechanistic_narrative":"RAB7B is a late endosome/lysosome-associated small GTPase that controls retrograde membrane transport from endosomes to the trans-Golgi network and promotes lysosomal degradation of specific cargo, thereby regulating innate immune signaling, cell migration, and autophagy. It mediates retrograde trafficking of sorting receptors CI-MPR and sortilin, with TBC1D5 serving as its GAP whose activity is enhanced by retromer, and its depletion impairs cathepsin-D maturation and cholera toxin B retrograde transport [PMID:20375062, PMID:22708738, PMID:30111580]. RAB7B promotes lysosomal degradation of TLR4 and TLR9 to dampen macrophage inflammatory responses [PMID:17395780, PMID:19587007], directly interacts with myosin II and the lysosomal Ca²⁺ channel TRPML1 to couple lysosomes to the actomyosin cytoskeleton for dendritic cell migration [PMID:25217632, PMID:34494097], and negatively regulates autophagic flux through interaction with the protease Atg4B [PMID:28835545]. RAB7B additionally functions in melanosome protein degradation in keratinocytes and negatively regulates oligodendroglial morphological differentiation [PMID:32037382, PMID:37248316]."},"prefetch_data":{"uniprot":{"accession":"Q96AH8","full_name":"Ras-related protein Rab-7b","aliases":[],"length_aa":199,"mass_kda":22.5,"function":"Controls vesicular trafficking from endosomes to the trans-Golgi network (TGN). Acts as a negative regulator of TLR9 signaling and can suppress TLR9-triggered TNFA, IL6, and IFNB production in macrophages by promoting TLR9 lysosomal degradation. Also negatively regulates TLR4 signaling in macrophages by promoting lysosomal degradation of TLR4. Promotes megakaryocytic differentiation by increasing NF-kappa-B-dependent IL6 production and subsequently enhancing the association of STAT3 with GATA1. Not involved in the regulation of the EGF- and EGFR degradation pathway","subcellular_location":"Late endosome; Lysosome; Golgi apparatus; Golgi apparatus, trans-Golgi network; Cytoplasmic vesicle, phagosome; Cytoplasmic vesicle, phagosome membrane","url":"https://www.uniprot.org/uniprotkb/Q96AH8/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RAB7B","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":74,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/RAB7B","total_profiled":1310},"omim":[{"mim_id":"612994","title":"RAS-ASSOCIATED PROTEIN 28; RAB28","url":"https://www.omim.org/entry/612994"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"skin 1","ntpm":49.2}],"url":"https://www.proteinatlas.org/search/RAB7B"},"hgnc":{"alias_symbol":["MGC9726","MGC16212"],"prev_symbol":[]},"alphafold":{"accession":"Q96AH8","domains":[{"cath_id":"3.40.50.300","chopping":"4-186","consensus_level":"high","plddt":92.2443,"start":4,"end":186}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96AH8","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96AH8-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96AH8-F1-predicted_aligned_error_v6.png","plddt_mean":88.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RAB7B","jax_strain_url":"https://www.jax.org/strain/search?query=RAB7B"},"sequence":{"accession":"Q96AH8","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96AH8.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96AH8/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96AH8"}},"corpus_meta":[{"pmid":"17395780","id":"PMC_17395780","title":"Lysosome-associated small Rab GTPase Rab7b negatively regulates TLR4 signaling in macrophages by promoting lysosomal degradation of TLR4.","date":"2007","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/17395780","citation_count":176,"is_preprint":false},{"pmid":"20375062","id":"PMC_20375062","title":"Rab7b controls trafficking from endosomes to the TGN.","date":"2010","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/20375062","citation_count":108,"is_preprint":false},{"pmid":"19587007","id":"PMC_19587007","title":"Late endosome/lysosome-localized Rab7b suppresses TLR9-initiated proinflammatory cytokine and type I IFN production in macrophages.","date":"2009","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/19587007","citation_count":56,"is_preprint":false},{"pmid":"15144907","id":"PMC_15144907","title":"Rab7b, a novel lysosome-associated small GTPase, is involved in monocytic differentiation of human acute promyelocytic leukemia cells.","date":"2004","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/15144907","citation_count":55,"is_preprint":false},{"pmid":"30111580","id":"PMC_30111580","title":"TBC1D5 controls the GTPase cycle of Rab7b.","date":"2018","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/30111580","citation_count":38,"is_preprint":false},{"pmid":"25217632","id":"PMC_25217632","title":"A novel interaction between Rab7b and actomyosin reveals a dual role in intracellular transport and cell migration.","date":"2014","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/25217632","citation_count":38,"is_preprint":false},{"pmid":"22708738","id":"PMC_22708738","title":"Dynamics of Rab7b-dependent transport of sorting receptors.","date":"2012","source":"Traffic (Copenhagen, Denmark)","url":"https://pubmed.ncbi.nlm.nih.gov/22708738","citation_count":36,"is_preprint":false},{"pmid":"25996526","id":"PMC_25996526","title":"Trichuris suis soluble products induce Rab7b expression and limit TLR4 responses in human dendritic cells.","date":"2015","source":"Genes and immunity","url":"https://pubmed.ncbi.nlm.nih.gov/25996526","citation_count":31,"is_preprint":false},{"pmid":"28835545","id":"PMC_28835545","title":"Rab7b modulates autophagic flux by interacting with Atg4B.","date":"2017","source":"EMBO reports","url":"https://pubmed.ncbi.nlm.nih.gov/28835545","citation_count":31,"is_preprint":false},{"pmid":"21057625","id":"PMC_21057625","title":"Rab7b and receptors trafficking.","date":"2010","source":"Communicative & integrative biology","url":"https://pubmed.ncbi.nlm.nih.gov/21057625","citation_count":28,"is_preprint":false},{"pmid":"24489676","id":"PMC_24489676","title":"The role of calpain-myosin 9-Rab7b pathway in mediating the expression of Toll-like receptor 4 in platelets: a novel mechanism involved in α-granules trafficking.","date":"2014","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/24489676","citation_count":26,"is_preprint":false},{"pmid":"32037382","id":"PMC_32037382","title":"Rab7B/42 Is Functionally Involved in Protein Degradation on Melanosomes in Keratinocytes.","date":"2020","source":"Cell structure and function","url":"https://pubmed.ncbi.nlm.nih.gov/32037382","citation_count":23,"is_preprint":false},{"pmid":"34494097","id":"PMC_34494097","title":"Rab7b regulates dendritic cell migration by linking lysosomes to the actomyosin cytoskeleton.","date":"2021","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/34494097","citation_count":22,"is_preprint":false},{"pmid":"30911939","id":"PMC_30911939","title":"Rab7b Overexpression-Ameliorated Ischemic Brain Damage Following tMCAO Involves Suppression of TLR4 and NF-κB p65.","date":"2019","source":"Journal of molecular neuroscience : 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migration.","date":"2015","source":"Communicative & integrative biology","url":"https://pubmed.ncbi.nlm.nih.gov/27066171","citation_count":12,"is_preprint":false},{"pmid":"31153054","id":"PMC_31153054","title":"Rab7b participation on the TLR4 (Toll-like receptor) endocytic pathway in Shiga toxin-associated Hemolytic Uremic Syndrome (HUS).","date":"2019","source":"Cytokine","url":"https://pubmed.ncbi.nlm.nih.gov/31153054","citation_count":7,"is_preprint":false},{"pmid":"38513840","id":"PMC_38513840","title":"Acetyl-11-keto-beta-boswellic acid inhibits cell proliferation and growth of oral squamous cell carcinoma via RAB7B-mediated autophagy.","date":"2024","source":"Toxicology and applied pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/38513840","citation_count":7,"is_preprint":false},{"pmid":"39280331","id":"PMC_39280331","title":"CRISPR/CasRx-Mediated Knockdown of Rab7B Restores Incomplete Cell Shape Induced by Pelizaeus-Merzbacher Disease-Associated PLP1 p.Ala243Val.","date":"2024","source":"Neuroscience insights","url":"https://pubmed.ncbi.nlm.nih.gov/39280331","citation_count":4,"is_preprint":false},{"pmid":"37248316","id":"PMC_37248316","title":"Knockdown of Rab7B, But Not of Rab7A, Which Antagonistically Regulates Oligodendroglial Cell Morphological Differentiation, Recovers Tunicamycin-Induced Defective Differentiation in FBD-102b Cells.","date":"2023","source":"Journal of molecular neuroscience : MN","url":"https://pubmed.ncbi.nlm.nih.gov/37248316","citation_count":3,"is_preprint":false},{"pmid":"40681176","id":"PMC_40681176","title":"Therapeutic potential of T-cell receptor targeting the HLA-A*11:01-restricted KRASG12V neoantigen without cross-recognition of the self-antigen RAB7B in solid tumors.","date":"2025","source":"Journal for immunotherapy of cancer","url":"https://pubmed.ncbi.nlm.nih.gov/40681176","citation_count":2,"is_preprint":false},{"pmid":"27349314","id":"PMC_27349314","title":"Site-directed mutagenesis, in vivo electroporation and mass spectrometry in search for determinants of the subcellular targeting of Rab7b paralogue in the model eukaryote Paramecium octaurelia.","date":"2016","source":"European journal of histochemistry : EJH","url":"https://pubmed.ncbi.nlm.nih.gov/27349314","citation_count":2,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":13062,"output_tokens":3655,"usd":0.047005},"stage2":{"model":"claude-opus-4-6","input_tokens":7078,"output_tokens":2857,"usd":0.160222},"total_usd":0.207227,"stage1_batch_id":"msgbatch_01SUR8NDzVrNmyszWyJeCct7","stage2_batch_id":"msgbatch_01G7Yfutko3cDWzejrwH5AMx","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2004,\n      \"finding\": \"Rab7b is a lysosome-localized small GTPase selectively expressed in monocytes and monocyte-derived dendritic cells, identified by immunofluorescence confocal microscopy to associate with lysosomal organelles.\",\n      \"method\": \"Immunofluorescence confocal microscopy, Northern blot, RT-PCR, Western blot\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization by immunofluorescence in single study; foundational cloning paper\",\n      \"pmids\": [\"15144907\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Rab7b negatively regulates TLR4 signaling in macrophages by promoting lysosomal degradation of TLR4; Rab7b localizes to LAMP-1-positive compartments and colocalizes with TLR4 after LPS stimulation, decreasing TLR4 protein levels and dampening downstream TNF-α, IL-6, NO, and IFN-β production.\",\n      \"method\": \"Overexpression and knockdown in macrophages, co-localization by immunofluorescence, Western blot for TLR4 protein levels, cytokine measurement\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (localization, loss/gain-of-function, protein level measurement), replicated in subsequent studies\",\n      \"pmids\": [\"17395780\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Rab7b localizes to late endosome/lysosome compartments, colocalizes with TLR9 in LAMP-1-positive compartments, and promotes TLR9 degradation, thereby negatively regulating TLR9-triggered proinflammatory cytokine and type I IFN production in macrophages. TLR9 ligation inhibits Rab7b expression via ERK and p38 activation.\",\n      \"method\": \"Overexpression and siRNA knockdown in macrophages, co-localization by immunofluorescence, Western blot, cytokine ELISA, kinase inhibitor assays\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal approaches (localization, gain/loss-of-function, signaling pathway inhibitors) in single study consistent with TLR4 findings\",\n      \"pmids\": [\"19587007\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Rab7b controls retrograde transport from late endosomes to the trans-Golgi network (TGN): GTP-bound (active) Rab7b localizes to the Golgi, while wild-type localizes to lysosomes. Depletion or dominant-negative expression of Rab7b impairs cathepsin-D maturation, causes increased hexosaminidase secretion, alters TGN46 distribution, and disrupts cation-independent mannose-6-phosphate receptor (CI-MPR) trafficking. Cholera toxin B retrograde transport to the Golgi is also blocked by Rab7b depletion.\",\n      \"method\": \"siRNA knockdown, dominant-negative and constitutively active mutant expression, subcellular fractionation, enzyme activity assays, immunofluorescence, cholera toxin retrograde transport assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods across multiple trafficking assays and markers; replicated by subsequent work\",\n      \"pmids\": [\"20375062\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Rab7b promotes PMA-induced megakaryocytic differentiation by activating NF-κB-dependent IL-6 production and subsequently enhancing the association of activated STAT3 with GATA-1.\",\n      \"method\": \"Overexpression and siRNA knockdown in leukemia cell lines, NF-κB inhibitor, neutralizing antibodies for IL-6/gp130, co-immunoprecipitation for STAT3-GATA-1 association, megakaryocytic marker quantification\",\n      \"journal\": \"Journal of molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — gain/loss-of-function with multiple signaling readouts and Co-IP in single study\",\n      \"pmids\": [\"20953574\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Rab7b regulates retrograde transport of both CI-MPR (mannose 6-phosphate-dependent) and sortilin (mannose 6-phosphate-independent sorting receptor); Rab7b directly interacts with sortilin, and expression of Rab7b mutants or silencing reduces CI-MPR and sortilin tubulation from TGN. Constitutively active Rab7b Q67L impairs carrier formation from TGN.\",\n      \"method\": \"Endosome-to-Golgi retrieval assays, co-immunoprecipitation, siRNA knockdown, mutant expression, live-cell imaging of TGN tubulation\",\n      \"journal\": \"Traffic\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — interaction validated by Co-IP, functional role confirmed by multiple orthogonal assays\",\n      \"pmids\": [\"22708738\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Rab7b directly interacts with myosin II; myosin II mediates transport of Rab7b-positive endosomes (Rab7b dynamics are disrupted by myosin II depletion or inhibition). Rab7b controls actin remodeling, stress fiber formation, cell adhesion, polarization, and migration by regulating activation of RhoA, which in turn controls myosin light chain phosphorylation.\",\n      \"method\": \"Co-immunoprecipitation, pulldown, live-cell imaging, myosin II siRNA/inhibitor, RhoA activity assay, myosin light chain phosphorylation Western blot, cell migration and adhesion assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct interaction confirmed by pulldown and Co-IP, functional consequences via multiple orthogonal assays\",\n      \"pmids\": [\"25217632\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In platelets, a calpain–myosin-9–Rab7b axis regulates TLR4-containing α-granule trafficking; calpain cleavage of myosin-9 modulates TLR4 expression, with co-immunoprecipitation showing interaction between TLR4 and myosin-9 regulated by calpain.\",\n      \"method\": \"Co-immunoprecipitation, flow cytometry, Western blot, pharmacological inhibitors (calpeptin, TMB-8), transmission electron microscopy\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP in platelets with inhibitor experiments, but Rab7b mechanistic role less directly established than the calpain-myosin-9 axis\",\n      \"pmids\": [\"24489676\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Rab7b interacts with the autophagy cysteine protease Atg4B; Rab7b and Atg4B co-localize on vesicles. Depletion of Rab7b increases autophagic flux (larger autophagic structures, increased sequestration and degradation). Rab7b negatively regulates autophagy by modulating Atg4B activity and LC3 processing.\",\n      \"method\": \"Co-immunoprecipitation, co-localization by immunofluorescence, autophagic flux assays (LC3 processing, sequestration assay), siRNA knockdown\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — interaction validated by Co-IP and co-localization, functional role confirmed by multiple orthogonal autophagic flux assays\",\n      \"pmids\": [\"28835545\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TBC1D5 is a GTPase-activating protein (GAP) for Rab7b that controls the endosomal transport to the TGN; TBC1D5 localizes to Rab7b-positive vesicles, physically interacts with Rab7b, and has GAP activity toward Rab7b in vitro, which is further enhanced by retromer proteins. Inactivation of TBC1D5 phenocopies constitutively active Rab7b by reducing CI-MPR- and sortilin-positive vesicles.\",\n      \"method\": \"siRNA screen of TBC-domain proteins, in vitro GAP assay, co-immunoprecipitation, co-localization by immunofluorescence, CI-MPR/sortilin vesicle quantification\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro biochemical GAP assay combined with interaction studies and cell-based phenotypic validation\",\n      \"pmids\": [\"30111580\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Rab7b/Rab42 is recruited to melanosome-containing compartments in keratinocytes and promotes protein degradation on melanosomes; knockdown or CRISPR/Cas9 knockout of Rab7B strongly inhibits protein degradation on incorporated melanosomes.\",\n      \"method\": \"Comprehensive Rab localization screen by fluorescence microscopy, CRISPR/Cas9 knockout, siRNA knockdown, melanosome degradation assay (M-INK probe)\",\n      \"journal\": \"Cell structure and function\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — quantitative degradation assay with both KD and KO approaches, systematic screen with defined readout\",\n      \"pmids\": [\"32037382\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Rab7b regulates dendritic cell migration by physically linking lysosomes to the actomyosin cytoskeleton; Rab7b directly interacts with the lysosomal Ca²⁺ channel TRPML1 (MCOLN1), enabling local activation of myosin II at the cell rear. Loss of Rab7b reduces myosin II light chain phosphorylation and activation of the transcription factor EB (TFEB), impairing lysosomal signaling required for fast DC migration.\",\n      \"method\": \"Co-immunoprecipitation (Rab7b–TRPML1 interaction), Rab7b knockout in dendritic cells, 1D and 3D migration assays, myosin light chain phosphorylation Western blot, TFEB activity assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct interaction validated by Co-IP, functional consequences in multiple migration assays, mechanistic downstream signaling established\",\n      \"pmids\": [\"34494097\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Rab7B negatively regulates oligodendroglial cell morphological differentiation; siRNA knockdown of Rab7B promotes differentiation of FBD-102b oligodendroglial precursor cells and rescues tunicamycin-induced ER-stress-mediated impairment of differentiation.\",\n      \"method\": \"siRNA knockdown, morphological differentiation assays, Western blot for differentiation/myelination markers, ER stress induction with tunicamycin\",\n      \"journal\": \"Journal of molecular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function with defined cellular and molecular phenotypic readouts in single study\",\n      \"pmids\": [\"37248316\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Rab7B knockdown using CRISPR/CasRx restores incomplete cell shapes induced by PLP1 p.Ala243Val mutation in oligodendroglial cells and promotes trafficking of mutant PLP1 to LAMP1-positive organelles.\",\n      \"method\": \"CRISPR/CasRx knockdown, morphological differentiation assay, immunofluorescence co-localization of PLP1 with LAMP1\",\n      \"journal\": \"Neuroscience insights\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — specific genetic knockdown with defined morphological and trafficking readouts\",\n      \"pmids\": [\"39280331\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RAB7B is a lysosome/late endosome-associated small GTPase that mediates retrograde transport from late endosomes to the trans-Golgi network (TGN) — regulated by its GAP TBC1D5 and retromer — and promotes lysosomal degradation of TLR4 and TLR9 to negatively regulate innate immune signaling; it directly interacts with myosin II (controlling actomyosin organization, RhoA activation, and cell migration), with the lysosomal Ca²⁺ channel TRPML1 (linking lysosomes to actomyosin for immune cell migration), and with the autophagy protease Atg4B (negatively regulating autophagic flux and LC3 processing), while also facilitating sorting receptor (CI-MPR, sortilin) trafficking and melanosome protein degradation in keratinocytes.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"RAB7B is a late endosome/lysosome-associated small GTPase that controls retrograde membrane transport from endosomes to the trans-Golgi network and promotes lysosomal degradation of specific cargo, thereby regulating innate immune signaling, cell migration, and autophagy. It mediates retrograde trafficking of sorting receptors CI-MPR and sortilin, with TBC1D5 serving as its GAP whose activity is enhanced by retromer, and its depletion impairs cathepsin-D maturation and cholera toxin B retrograde transport [PMID:20375062, PMID:22708738, PMID:30111580]. RAB7B promotes lysosomal degradation of TLR4 and TLR9 to dampen macrophage inflammatory responses [PMID:17395780, PMID:19587007], directly interacts with myosin II and the lysosomal Ca²⁺ channel TRPML1 to couple lysosomes to the actomyosin cytoskeleton for dendritic cell migration [PMID:25217632, PMID:34494097], and negatively regulates autophagic flux through interaction with the protease Atg4B [PMID:28835545]. RAB7B additionally functions in melanosome protein degradation in keratinocytes and negatively regulates oligodendroglial morphological differentiation [PMID:32037382, PMID:37248316].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"The initial identification of RAB7B as a lysosome-associated Rab GTPase with restricted expression in monocytic lineage cells established it as a candidate regulator of endolysosomal function in immune cells.\",\n      \"evidence\": \"Immunofluorescence, Northern blot, and RT-PCR in monocytes and monocyte-derived dendritic cells\",\n      \"pmids\": [\"15144907\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional role established\", \"Expression in non-monocytic tissues not assessed\", \"No interacting partners identified\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"The discovery that RAB7B promotes lysosomal degradation of TLR4 and dampens LPS-induced cytokine production defined its first functional role as a negative regulator of innate immune signaling.\",\n      \"evidence\": \"Overexpression and knockdown in macrophages with TLR4 protein level measurement and cytokine quantification\",\n      \"pmids\": [\"17395780\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which RAB7B targets TLR4 for degradation unclear\", \"Whether other TLRs are similarly regulated unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Extension of the TLR degradation role to TLR9 demonstrated that RAB7B is a general negative regulator of endosomal TLR signaling, with a feedback loop whereby TLR9 ligation suppresses RAB7B expression via ERK/p38.\",\n      \"evidence\": \"Overexpression, siRNA knockdown, cytokine ELISA, and kinase inhibitor assays in macrophages\",\n      \"pmids\": [\"19587007\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether RAB7B regulates other endosomal TLRs (TLR3, TLR7, TLR8) not tested\", \"Structural basis for TLR recognition unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Demonstration that RAB7B controls retrograde transport from late endosomes to the TGN — affecting CI-MPR trafficking, cathepsin-D maturation, and cholera toxin B retrieval — revealed a fundamental membrane trafficking function beyond immune-specific cargo degradation.\",\n      \"evidence\": \"siRNA knockdown, dominant-negative/constitutively-active mutants, multiple retrograde transport assays, enzyme activity assays\",\n      \"pmids\": [\"20375062\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Effector proteins mediating retrograde transport not identified\", \"Relationship between lysosomal and TGN-retrograde functions unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"The finding that RAB7B also regulates sortilin retrograde trafficking and directly interacts with sortilin broadened its role to both MPR-dependent and MPR-independent sorting receptor pathways and identified its first direct cargo interaction.\",\n      \"evidence\": \"Co-immunoprecipitation, endosome-to-Golgi retrieval assays, live-cell imaging of TGN tubulation\",\n      \"pmids\": [\"22708738\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Nature of the Rab7b–sortilin binding interface unknown\", \"Whether other sorting receptors are directly bound not tested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identification of myosin II as a direct RAB7B interactor that transports RAB7B-positive endosomes and mediates RAB7B-dependent RhoA activation, stress fiber formation, and cell migration linked RAB7B to actomyosin cytoskeletal control.\",\n      \"evidence\": \"Co-immunoprecipitation, pulldown, live-cell imaging, myosin II depletion/inhibition, RhoA and MLC phosphorylation assays, migration assays\",\n      \"pmids\": [\"25217632\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How RAB7B activates RhoA mechanistically not established\", \"Whether the myosin II interaction is GTP-dependent not fully resolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Discovery of the RAB7B–Atg4B interaction and the demonstration that RAB7B depletion increases autophagic flux established RAB7B as a negative regulator of autophagy acting through modulation of LC3 processing.\",\n      \"evidence\": \"Co-immunoprecipitation, co-localization, autophagic flux assays including LC3 processing and sequestration assays, siRNA knockdown\",\n      \"pmids\": [\"28835545\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether RAB7B directly inhibits Atg4B enzymatic activity or sequesters it from substrates not distinguished\", \"In vivo relevance of autophagy regulation not tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identification of TBC1D5 as the GAP for RAB7B, with retromer-enhanced activity, and phenocopy of constitutively active RAB7B by TBC1D5 depletion established the regulatory circuit controlling RAB7B GTPase cycling in endosome-to-TGN transport.\",\n      \"evidence\": \"In vitro GAP assay, siRNA screen of TBC-domain proteins, co-immunoprecipitation, CI-MPR/sortilin vesicle quantification\",\n      \"pmids\": [\"30111580\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"GEF for RAB7B not identified\", \"Structural basis of TBC1D5–retromer–RAB7B ternary interaction unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstration that RAB7B is recruited to melanosome-containing compartments in keratinocytes and is required for protein degradation on melanosomes expanded its functional repertoire to pigmentation biology.\",\n      \"evidence\": \"Systematic Rab localization screen, CRISPR/Cas9 knockout and siRNA knockdown with M-INK melanosome degradation probe\",\n      \"pmids\": [\"32037382\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Effectors mediating melanosome protein degradation not identified\", \"Relationship to lysosomal fusion machinery unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"The finding that RAB7B directly interacts with the lysosomal Ca²⁺ channel TRPML1 to locally activate myosin II at the cell rear, enabling fast dendritic cell migration, unified the lysosomal and actomyosin functions into a single mechanistic pathway coupling lysosomal signaling to cell motility.\",\n      \"evidence\": \"Co-immunoprecipitation of RAB7B–TRPML1, Rab7b knockout dendritic cells, 1D and 3D migration assays, MLC phosphorylation and TFEB activity measurements\",\n      \"pmids\": [\"34494097\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TRPML1-dependent Ca²⁺ release directly activates myosin II or acts through intermediate kinases not fully resolved\", \"Relevance to in vivo immune cell trafficking not shown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"RAB7B was shown to negatively regulate oligodendroglial morphological differentiation, with its depletion rescuing ER-stress-impaired differentiation, revealing a role in CNS glial biology.\",\n      \"evidence\": \"siRNA knockdown in FBD-102b oligodendroglial cells, differentiation markers, tunicamycin-induced ER stress\",\n      \"pmids\": [\"37248316\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism connecting RAB7B to oligodendrocyte differentiation signaling unknown\", \"Single cell line used\", \"In vivo relevance in myelination not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The GEF activating RAB7B, the structural basis of its interactions with multiple effectors (TRPML1, myosin II, Atg4B, sortilin), and its in vivo roles in immune regulation and myelination remain to be established.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No GEF for RAB7B has been identified\", \"No crystal or cryo-EM structure of RAB7B or its effector complexes exists\", \"In vivo knockout phenotype not reported\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003924\", \"supporting_discovery_ids\": [3, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [0, 1, 2, 10, 11]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [3, 5, 9]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [3, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [3, 5, 9]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1, 2, 11]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"MYH9\",\n      \"MCOLN1\",\n      \"ATG4B\",\n      \"SORT1\",\n      \"TBC1D5\",\n      \"TLR4\",\n      \"TLR9\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}