{"gene":"RAB7B","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":2004,"finding":"RAB7B (Rab7b) is a novel small GTPase that localizes to lysosomal organelles, as demonstrated by immunofluorescence confocal microscopy. It is selectively expressed in monocytes and monocyte-derived cells and is involved in PMA-induced monocytic differentiation of APL cells.","method":"Immunofluorescence confocal microscopy, Western blot, RT-PCR, overexpression in HL-60/NB4 cell lines","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — direct localization experiment with functional KO/OE readout, single lab, multiple methods","pmids":["15144907"],"is_preprint":false},{"year":2007,"finding":"Rab7b localizes to LAMP-1-positive (lysosomal) compartments and colocalizes with TLR4 after LPS treatment. Overexpression of Rab7b promotes lysosomal degradation of TLR4, thereby negatively regulating LPS-induced TNF-α, IL-6, nitric oxide, and IFN-β production, as well as MAP kinase, NF-κB, and IRF3 signaling in macrophages.","method":"Immunofluorescence colocalization, Western blot (TLR4 protein level), overexpression and knockdown in macrophages, cytokine measurement","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal gain/loss-of-function with multiple orthogonal readouts (protein degradation, colocalization, cytokine assays), replicated across subsequent independent studies","pmids":["17395780"],"is_preprint":false},{"year":2009,"finding":"Late endosome/lysosome-localized Rab7b colocalizes with TLR9 in LAMP-1-positive compartments and promotes TLR9 degradation upon TLR9 activation, thereby negatively regulating TLR9-triggered TNF-α, IL-6, and IFN-β production and impairing MAPK and NF-κB pathway activation in macrophages. TLR9 ligation inhibits Rab7b expression via ERK and p38 activation.","method":"Immunofluorescence colocalization, Western blot (TLR9 protein levels), overexpression/knockdown in macrophages, cytokine ELISA, kinase activation assays","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods, gain/loss-of-function, mechanistic pathway placement, consistent with TLR4 findings from same group","pmids":["19587007"],"is_preprint":false},{"year":2010,"finding":"Rab7b controls retrograde transport from late endosomes to the trans-Golgi network (TGN). Wild-type Rab7b is lysosome-associated, while GTP-bound (constitutively active) Rab7b localizes to the Golgi. Depletion or dominant-negative Rab7b T22N impairs cathepsin-D maturation, increases hexosaminidase secretion, alters TGN46 distribution, impairs CI-MPR trafficking, increases CI-MPR and cathepsin-D levels, and prevents cholera toxin B-subunit from reaching the Golgi. VSV-G trafficking is unaffected. Rab7b is not involved in EGF/EGFR degradation.","method":"siRNA knockdown, dominant-negative mutant expression (T22N), constitutively active mutant (Q67L), immunofluorescence, Western blot, hexosaminidase secretion assay, cholera toxin trafficking assay","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (depletion + dominant-negative + constitutively active mutants), specific cargo readouts, negative control (VSV-G), single rigorous study","pmids":["20375062"],"is_preprint":false},{"year":2010,"finding":"Rab7b promotes PMA-induced megakaryocytic differentiation by activating NF-κB-dependent IL-6 production and enhancing the association of activated STAT3 with GATA-1. Rab7b silencing impairs NF-κB activation, IL-6 production, and megakaryocytic differentiation markers.","method":"siRNA knockdown, overexpression, NF-κB inhibitor, IL-6 neutralizing antibody, STAT3-GATA-1 co-immunoprecipitation, flow cytometry for differentiation markers","journal":"Journal of molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — gain/loss-of-function with pathway inhibition and co-IP, single lab","pmids":["20953574"],"is_preprint":false},{"year":2012,"finding":"Rab7b regulates retrograde transport of both CI-MPR and sortilin (a mannose-6-phosphate-independent sorting receptor) from late endosomes to the TGN. Rab7b interacts with sortilin directly. Expression of Rab7b mutants or silencing reduces CI-MPR and sortilin tubulation from TGN, and the constitutively active mutant Q67L impairs carrier formation from TGN.","method":"siRNA knockdown, constitutively active (Q67L) and dominant-negative (T22N) mutant expression, endosome-to-Golgi retrieval assays, immunofluorescence, live-cell imaging, co-immunoprecipitation (Rab7b-sortilin interaction)","journal":"Traffic","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple mutants, co-IP for direct interaction, live-cell imaging, cargo-specific assays, single lab","pmids":["22708738"],"is_preprint":false},{"year":2014,"finding":"Rab7b directly interacts with myosin II (actomyosin). Myosin II mediates transport of Rab7b-positive endosomes, as Rab7b vesicle dynamics are strongly impaired after myosin II depletion or inhibition. Rab7b also controls RhoA activation status, thereby regulating myosin light chain phosphorylation, stress fiber formation, cell adhesion, polarization, and migration.","method":"Co-immunoprecipitation/pulldown (direct interaction with myosin II), myosin II siRNA depletion, myosin II inhibition, live-cell imaging of Rab7b dynamics, RhoA activation assay, myosin light chain phosphorylation assay, cell migration assay","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct interaction established by pulldown, functional consequence via depletion/inhibition with multiple orthogonal readouts, single lab","pmids":["25217632"],"is_preprint":false},{"year":2017,"finding":"Rab7b interacts with and co-localizes with the cysteine protease Atg4B on vesicles. Depletion of Rab7b increases autophagic flux (increased size of autophagic structures, increased macroautophagic sequestration and degradation). Rab7b negatively regulates autophagy by modulating Atg4B activity and thus LC3 processing.","method":"Co-immunoprecipitation (Rab7b-Atg4B interaction), colocalization by immunofluorescence, siRNA knockdown of Rab7b, autophagic flux assays (LC3 processing, sequestration/degradation assays)","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — co-IP for direct interaction, loss-of-function with multiple orthogonal autophagic flux readouts, mechanistic link to Atg4B activity, single lab","pmids":["28835545"],"is_preprint":false},{"year":2018,"finding":"TBC1D5 is a GTPase-activating protein (GAP) for Rab7b. TBC1D5 localizes to Rab7b-positive vesicles, physically interacts with Rab7b, and has GAP activity towards Rab7b in vitro; this GAP activity is further increased by retromer proteins. Silencing TBC1D5 reduces the number of CI-MPR- and sortilin-positive vesicles, phenocopying constitutively active Rab7b. An siRNA screen of TBC domain-containing proteins identified TBC1D5 as the strongest hit affecting Rab7b distribution.","method":"siRNA screen (TBC domain proteins), in vitro GAP activity assay, co-immunoprecipitation (TBC1D5-Rab7b), immunofluorescence colocalization, cell-based phenotypic assays (CI-MPR/sortilin vesicle number)","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro GAP assay plus co-IP plus cell-based phenotype, multiple orthogonal methods, single lab","pmids":["30111580"],"is_preprint":false},{"year":2020,"finding":"Rab7B (also identified as Rab42) localizes to melanosome-containing compartments in keratinocytes and is required for protein degradation on incorporated melanosomes. Knockdown or CRISPR/Cas9 knockout of Rab7B strongly inhibits protein degradation on melanosomes in keratinocytes.","method":"Comprehensive Rab localization screen (Rab1–45), CRISPR/Cas9 knockout, siRNA knockdown, melanosome protein degradation assay (M-INK probe), immunofluorescence","journal":"Cell structure and function","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR KO and KD with quantitative functional readout, single lab","pmids":["32037382"],"is_preprint":false},{"year":2021,"finding":"Rab7b links lysosomes to the actomyosin cytoskeleton to enable dendritic cell migration. Lack of Rab7b reduces myosin II light chain phosphorylation and activation of the transcription factor TFEB (required for lysosomal signaling and fast DC migration). Rab7b directly interacts with the lysosomal Ca2+ channel TRPML1 (MCOLN1), enabling local activation of myosin II at the cell rear.","method":"Rab7b knockout/knockdown in dendritic cells, 1D and 3D migration assays, co-immunoprecipitation (Rab7b-TRPML1 interaction), myosin light chain phosphorylation assay, TFEB activation assay","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Moderate — co-IP for direct interaction with TRPML1, loss-of-function with multiple functional readouts (migration, MLC phosphorylation, TFEB), builds on established Rab7b-myosin II interaction","pmids":["34494097"],"is_preprint":false},{"year":2023,"finding":"Rab7B negatively regulates oligodendroglial cell morphological differentiation. Knockdown of Rab7B (but not Rab7A) recovers tunicamycin-induced ER stress-impaired morphological differentiation in FBD-102b oligodendroglial precursor cells, as measured by changes in differentiation- and myelination-related structural protein markers.","method":"siRNA knockdown of Rab7B and Rab7A, tunicamycin-induced ER stress model, morphological differentiation assay, Western blot for differentiation/myelination markers","journal":"Journal of molecular neuroscience","confidence":"Medium","confidence_rationale":"Tier 2–3 / Weak — loss-of-function with defined phenotypic readout but single lab and single method set","pmids":["37248316"],"is_preprint":false},{"year":2024,"finding":"Knockdown of Rab7B via CRISPR/CasRx restores incomplete cell shapes induced by the PMD-associated PLP1 p.Ala243Val mutation in oligodendroglial FBD-102b cells, and promotes trafficking of mutant PLP1 to LAMP1-positive organelles.","method":"CRISPR/CasRx-mediated Rab7B knockdown, immunofluorescence (LAMP1 colocalization), cell morphology assay","journal":"Neuroscience insights","confidence":"Medium","confidence_rationale":"Tier 2–3 / Weak — specific genetic tool with defined morphological and trafficking readouts, single lab","pmids":["39280331"],"is_preprint":false},{"year":2014,"finding":"In thrombin-stimulated platelets, a calpain-myosin 9-Rab7b axis regulates TLR4-containing α-granule trafficking. Calpain cleaves myosin-9, and the interaction between TLR4 and myosin-9 is regulated by calpain. Co-IP indicated that myosin-9 does not coordinate with Rab7b to negatively regulate TLR4 trafficking in thrombin-treated platelets (negative finding for this specific context).","method":"Co-immunoprecipitation, flow cytometry (surface TLR4), Western blot, pharmacological inhibitors (calpeptin, TMB-8, U73122), transmission electron microscopy","journal":"PloS one","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single co-IP, single lab, limited mechanistic resolution for Rab7b's specific role; the main finding for Rab7b is negative (no myosin-9 coordination with Rab7b)","pmids":["24489676"],"is_preprint":false}],"current_model":"RAB7B is a late endosome/lysosome-localized small GTPase that mediates retrograde transport from late endosomes to the trans-Golgi network (TGN) — regulating CI-MPR and sortilin trafficking, cathepsin-D maturation, and lysosomal enzyme delivery — while its GTPase cycle is controlled by the GAP TBC1D5 (potentiated by retromer); it also promotes lysosomal degradation of TLR4 and TLR9 to negatively regulate innate immune signaling, directly interacts with myosin II (via RhoA–myosin light chain phosphorylation axis) and the lysosomal Ca²⁺ channel TRPML1 to link lysosomes to the actomyosin cytoskeleton for cell migration, modulates autophagy by interacting with and restraining the Atg4B protease, and promotes protein degradation on melanosomes in keratinocytes."},"narrative":{"mechanistic_narrative":"RAB7B is a late endosome/lysosome-localized small GTPase that governs retrograde membrane traffic from late endosomes to the trans-Golgi network and, through this control of lysosomal trafficking, modulates innate immune signaling, autophagy, and cell migration [PMID:20375062, PMID:17395780]. Cycling between a lysosome-associated wild-type pool and a Golgi-localized GTP-bound state, RAB7B controls retrieval of the cargo receptors CI-MPR and sortilin — with which it interacts directly — back to the TGN, and its loss disrupts cathepsin-D maturation and lysosomal enzyme delivery [PMID:20375062, PMID:22708738]. Its GTPase cycle is terminated by the GAP TBC1D5, which binds RAB7B and exhibits GAP activity that is potentiated by retromer, such that TBC1D5 depletion phenocopies constitutively active RAB7B in CI-MPR/sortilin vesicle distribution [PMID:30111580]. In macrophages, RAB7B drives lysosomal degradation of activated TLR4 and TLR9, thereby attenuating LPS- and CpG-induced MAPK, NF-κB, and IRF3 signaling and cytokine output [PMID:17395780, PMID:19587007]. RAB7B additionally links lysosomes to the actomyosin cytoskeleton: it interacts directly with myosin II and with the lysosomal Ca²⁺ channel TRPML1, controlling RhoA activity and myosin light-chain phosphorylation to support stress-fiber formation, adhesion, and dendritic-cell migration [PMID:25217632, PMID:34494097]. It also restrains autophagy by binding the protease Atg4B and limiting LC3 processing [PMID:28835545].","teleology":[{"year":2004,"claim":"Established RAB7B as a distinct lysosome-localized small GTPase with a cell-type-restricted expression pattern, defining the organelle and lineage context for all later mechanistic work.","evidence":"Immunofluorescence, RT-PCR, and overexpression in monocytic cell lines","pmids":["15144907"],"confidence":"Medium","gaps":["No biochemical demonstration of GTPase activity","Molecular effectors and traffic step undefined"]},{"year":2007,"claim":"Answered what RAB7B does in immune cells by showing it routes activated TLR4 to lysosomes for degradation, defining a negative-feedback role in innate immune signaling.","evidence":"Reciprocal overexpression/knockdown in macrophages with TLR4 protein, cytokine, and pathway readouts","pmids":["17395780"],"confidence":"High","gaps":["Adaptor linking RAB7B to TLR4 cargo not identified","GTPase cycle requirement not tested here"]},{"year":2009,"claim":"Generalized the immune-regulatory mechanism by showing RAB7B also degrades TLR9 and is itself transcriptionally suppressed downstream of TLR9 activation, revealing a regulatory loop.","evidence":"Colocalization, knockdown/overexpression, cytokine ELISA and kinase assays in macrophages","pmids":["19587007"],"confidence":"High","gaps":["Selectivity for which receptor cargoes is degraded unresolved","Mechanism of ERK/p38-mediated Rab7b suppression not detailed"]},{"year":2010,"claim":"Defined the core trafficking activity of RAB7B as retrograde transport from late endosomes to the TGN, coupling its GTP state to Golgi localization and to lysosomal enzyme delivery.","evidence":"siRNA, dominant-negative (T22N) and constitutively active (Q67L) mutants, cargo-specific assays including cholera toxin and VSV-G controls","pmids":["20375062"],"confidence":"High","gaps":["Direct cargo receptors not yet identified","Tubulation/carrier machinery undefined"]},{"year":2012,"claim":"Identified the specific cargoes of RAB7B-dependent retrieval, showing it directly binds sortilin and controls both CI-MPR and sortilin retrieval and TGN carrier formation.","evidence":"Mutant expression, endosome-to-Golgi retrieval assays, live imaging, Rab7b-sortilin co-IP","pmids":["22708738"],"confidence":"High","gaps":["Whether sortilin binding is direct vs complex-mediated not structurally resolved","GAP/GEF controlling the cycle still unknown"]},{"year":2010,"claim":"Extended RAB7B function to hematopoietic differentiation, linking it to NF-κB/IL-6 signaling and STAT3-GATA-1 association during megakaryocytic differentiation.","evidence":"siRNA/overexpression, pathway inhibitors, STAT3-GATA-1 co-IP, differentiation marker flow cytometry","pmids":["20953574"],"confidence":"Medium","gaps":["Connection between trafficking role and NF-κB activation mechanistically unclear","Single lineage context"]},{"year":2014,"claim":"Connected RAB7B to the cytoskeleton by establishing direct binding to myosin II and control of RhoA/MLC signaling, explaining how RAB7B vesicles move and how it influences adhesion and migration.","evidence":"Pulldown for direct interaction, myosin II depletion/inhibition, RhoA and MLC phosphorylation assays, migration assays","pmids":["25217632"],"confidence":"High","gaps":["Direct vs indirect basis of RhoA regulation unresolved","How GTPase cycle gates myosin engagement unknown"]},{"year":2017,"claim":"Revealed a role in autophagy regulation: RAB7B binds the protease Atg4B and restrains LC3 processing, so its loss elevates autophagic flux.","evidence":"Rab7b-Atg4B co-IP, colocalization, siRNA knockdown with multiple autophagic flux readouts","pmids":["28835545"],"confidence":"High","gaps":["Whether binding directly inhibits Atg4B catalysis not shown biochemically","Link to retrograde trafficking role unclear"]},{"year":2018,"claim":"Identified TBC1D5 as the GAP that terminates the RAB7B GTPase cycle, with retromer potentiation, placing RAB7B in a defined regulatory circuit for CI-MPR/sortilin retrieval.","evidence":"TBC-domain siRNA screen, in vitro GAP assay, TBC1D5-Rab7b co-IP, vesicle-number phenotypes","pmids":["30111580"],"confidence":"High","gaps":["GEF activating RAB7B not identified","Structural basis of TBC1D5-retromer-Rab7b coupling unresolved"]},{"year":2020,"claim":"Demonstrated a tissue-specific function in keratinocytes, where RAB7B is required for degradation of incorporated melanosomes.","evidence":"Rab localization screen, CRISPR/Cas9 KO and siRNA with melanosome protein degradation probe","pmids":["32037382"],"confidence":"Medium","gaps":["Molecular effectors on melanosomes unidentified","Relation to TGN retrieval role unclear"]},{"year":2021,"claim":"Integrated lysosomal and cytoskeletal roles by showing RAB7B binds TRPML1 to enable local myosin II activation and TFEB signaling driving dendritic-cell migration.","evidence":"Rab7b KO/KD in dendritic cells, 3D migration assays, Rab7b-TRPML1 co-IP, MLC phosphorylation and TFEB assays","pmids":["34494097"],"confidence":"High","gaps":["How Ca2+ flux through TRPML1 is spatially restricted by RAB7B not resolved","Direct vs indirect TFEB regulation unclear"]},{"year":2023,"claim":"Implicated RAB7B in oligodendroglial differentiation, where its knockdown rescues ER-stress-impaired morphological differentiation, distinguishing it from RAB7A.","evidence":"siRNA of Rab7B vs Rab7A in a tunicamycin ER-stress model with differentiation markers","pmids":["37248316"],"confidence":"Medium","gaps":["Mechanism linking RAB7B to ER stress/differentiation undefined","Single cell-line model"]},{"year":2024,"claim":"Extended the oligodendroglial role to disease, showing RAB7B knockdown rescues morphology in cells expressing a PMD-associated PLP1 mutant and reroutes mutant PLP1 to lysosomes.","evidence":"CRISPR/CasRx knockdown with LAMP1 colocalization and morphology assays","pmids":["39280331"],"confidence":"Medium","gaps":["Causal trafficking mechanism for mutant PLP1 not defined","Single model system"]},{"year":null,"claim":"The activating GEF for RAB7B and a unified structural model coupling its GTPase cycle to retrograde retrieval, cytoskeletal engagement, and Atg4B regulation remain undefined.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No GEF identified","No structure of RAB7B with its effectors","Mechanistic unification of trafficking, immune, and migration roles lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003924","term_label":"GTPase activity","supporting_discovery_ids":[3,5,8]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[6,10]}],"localization":[{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[0,1,2,3]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[3,5]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[7]}],"pathway":[{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[3,5]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[3,5,8]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[1,2]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[7]}],"complexes":[],"partners":["SORT1","TBC1D5","MYH9","MCOLN1","ATG4B","TLR4","TLR9"],"other_free_text":[]}},"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":178,"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":32,"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":30,"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 : MN","url":"https://pubmed.ncbi.nlm.nih.gov/30911939","citation_count":22,"is_preprint":false},{"pmid":"20953574","id":"PMC_20953574","title":"Small Rab GTPase Rab7b promotes megakaryocytic differentiation by enhancing IL-6 production and STAT3-GATA-1 association.","date":"2010","source":"Journal of molecular medicine (Berlin, Germany)","url":"https://pubmed.ncbi.nlm.nih.gov/20953574","citation_count":19,"is_preprint":false},{"pmid":"35100921","id":"PMC_35100921","title":"Hyperthermia promotes exosome secretion by regulating Rab7b while increasing drug sensitivity in adriamycin-resistant breast cancer.","date":"2022","source":"International journal of hyperthermia : the official journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group","url":"https://pubmed.ncbi.nlm.nih.gov/35100921","citation_count":14,"is_preprint":false},{"pmid":"27066171","id":"PMC_27066171","title":"Rab7b at the intersection of intracellular trafficking and cell migration.","date":"2015","source":"Communicative & integrative biology","url":"https://pubmed.ncbi.nlm.nih.gov/27066171","citation_count":12,"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":"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":"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":13825,"output_tokens":4148,"usd":0.051847,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":11801,"output_tokens":4068,"usd":0.080352,"stage2_stop_reason":"end_turn"},"total_usd":0.132199,"stage1_batch_id":"msgbatch_01CNoDbkChHEkgrJnL7BwtGJ","stage2_batch_id":"msgbatch_016Y4x9E9Wg5VQDANj9quSQD","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2004,\n      \"finding\": \"RAB7B (Rab7b) is a novel small GTPase that localizes to lysosomal organelles, as demonstrated by immunofluorescence confocal microscopy. It is selectively expressed in monocytes and monocyte-derived cells and is involved in PMA-induced monocytic differentiation of APL cells.\",\n      \"method\": \"Immunofluorescence confocal microscopy, Western blot, RT-PCR, overexpression in HL-60/NB4 cell lines\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — direct localization experiment with functional KO/OE readout, single lab, multiple methods\",\n      \"pmids\": [\"15144907\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Rab7b localizes to LAMP-1-positive (lysosomal) compartments and colocalizes with TLR4 after LPS treatment. Overexpression of Rab7b promotes lysosomal degradation of TLR4, thereby negatively regulating LPS-induced TNF-α, IL-6, nitric oxide, and IFN-β production, as well as MAP kinase, NF-κB, and IRF3 signaling in macrophages.\",\n      \"method\": \"Immunofluorescence colocalization, Western blot (TLR4 protein level), overexpression and knockdown in macrophages, cytokine measurement\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal gain/loss-of-function with multiple orthogonal readouts (protein degradation, colocalization, cytokine assays), replicated across subsequent independent studies\",\n      \"pmids\": [\"17395780\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Late endosome/lysosome-localized Rab7b colocalizes with TLR9 in LAMP-1-positive compartments and promotes TLR9 degradation upon TLR9 activation, thereby negatively regulating TLR9-triggered TNF-α, IL-6, and IFN-β production and impairing MAPK and NF-κB pathway activation in macrophages. TLR9 ligation inhibits Rab7b expression via ERK and p38 activation.\",\n      \"method\": \"Immunofluorescence colocalization, Western blot (TLR9 protein levels), overexpression/knockdown in macrophages, cytokine ELISA, kinase activation assays\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods, gain/loss-of-function, mechanistic pathway placement, consistent with TLR4 findings from same group\",\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). Wild-type Rab7b is lysosome-associated, while GTP-bound (constitutively active) Rab7b localizes to the Golgi. Depletion or dominant-negative Rab7b T22N impairs cathepsin-D maturation, increases hexosaminidase secretion, alters TGN46 distribution, impairs CI-MPR trafficking, increases CI-MPR and cathepsin-D levels, and prevents cholera toxin B-subunit from reaching the Golgi. VSV-G trafficking is unaffected. Rab7b is not involved in EGF/EGFR degradation.\",\n      \"method\": \"siRNA knockdown, dominant-negative mutant expression (T22N), constitutively active mutant (Q67L), immunofluorescence, Western blot, hexosaminidase secretion assay, cholera toxin trafficking assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (depletion + dominant-negative + constitutively active mutants), specific cargo readouts, negative control (VSV-G), single rigorous study\",\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 enhancing the association of activated STAT3 with GATA-1. Rab7b silencing impairs NF-κB activation, IL-6 production, and megakaryocytic differentiation markers.\",\n      \"method\": \"siRNA knockdown, overexpression, NF-κB inhibitor, IL-6 neutralizing antibody, STAT3-GATA-1 co-immunoprecipitation, flow cytometry for differentiation markers\",\n      \"journal\": \"Journal of molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — gain/loss-of-function with pathway inhibition and co-IP, single lab\",\n      \"pmids\": [\"20953574\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Rab7b regulates retrograde transport of both CI-MPR and sortilin (a mannose-6-phosphate-independent sorting receptor) from late endosomes to the TGN. Rab7b interacts with sortilin directly. Expression of Rab7b mutants or silencing reduces CI-MPR and sortilin tubulation from TGN, and the constitutively active mutant Q67L impairs carrier formation from TGN.\",\n      \"method\": \"siRNA knockdown, constitutively active (Q67L) and dominant-negative (T22N) mutant expression, endosome-to-Golgi retrieval assays, immunofluorescence, live-cell imaging, co-immunoprecipitation (Rab7b-sortilin interaction)\",\n      \"journal\": \"Traffic\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple mutants, co-IP for direct interaction, live-cell imaging, cargo-specific assays, single lab\",\n      \"pmids\": [\"22708738\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Rab7b directly interacts with myosin II (actomyosin). Myosin II mediates transport of Rab7b-positive endosomes, as Rab7b vesicle dynamics are strongly impaired after myosin II depletion or inhibition. Rab7b also controls RhoA activation status, thereby regulating myosin light chain phosphorylation, stress fiber formation, cell adhesion, polarization, and migration.\",\n      \"method\": \"Co-immunoprecipitation/pulldown (direct interaction with myosin II), myosin II siRNA depletion, myosin II inhibition, live-cell imaging of Rab7b dynamics, RhoA activation assay, myosin light chain phosphorylation assay, cell migration assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct interaction established by pulldown, functional consequence via depletion/inhibition with multiple orthogonal readouts, single lab\",\n      \"pmids\": [\"25217632\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Rab7b interacts with and co-localizes with the cysteine protease Atg4B on vesicles. Depletion of Rab7b increases autophagic flux (increased size of autophagic structures, increased macroautophagic sequestration and degradation). Rab7b negatively regulates autophagy by modulating Atg4B activity and thus LC3 processing.\",\n      \"method\": \"Co-immunoprecipitation (Rab7b-Atg4B interaction), colocalization by immunofluorescence, siRNA knockdown of Rab7b, autophagic flux assays (LC3 processing, sequestration/degradation assays)\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP for direct interaction, loss-of-function with multiple orthogonal autophagic flux readouts, mechanistic link to Atg4B activity, single lab\",\n      \"pmids\": [\"28835545\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TBC1D5 is a GTPase-activating protein (GAP) for Rab7b. TBC1D5 localizes to Rab7b-positive vesicles, physically interacts with Rab7b, and has GAP activity towards Rab7b in vitro; this GAP activity is further increased by retromer proteins. Silencing TBC1D5 reduces the number of CI-MPR- and sortilin-positive vesicles, phenocopying constitutively active Rab7b. An siRNA screen of TBC domain-containing proteins identified TBC1D5 as the strongest hit affecting Rab7b distribution.\",\n      \"method\": \"siRNA screen (TBC domain proteins), in vitro GAP activity assay, co-immunoprecipitation (TBC1D5-Rab7b), immunofluorescence colocalization, cell-based phenotypic assays (CI-MPR/sortilin vesicle number)\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro GAP assay plus co-IP plus cell-based phenotype, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"30111580\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Rab7B (also identified as Rab42) localizes to melanosome-containing compartments in keratinocytes and is required for protein degradation on incorporated melanosomes. Knockdown or CRISPR/Cas9 knockout of Rab7B strongly inhibits protein degradation on melanosomes in keratinocytes.\",\n      \"method\": \"Comprehensive Rab localization screen (Rab1–45), CRISPR/Cas9 knockout, siRNA knockdown, melanosome protein degradation assay (M-INK probe), immunofluorescence\",\n      \"journal\": \"Cell structure and function\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR KO and KD with quantitative functional readout, single lab\",\n      \"pmids\": [\"32037382\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Rab7b links lysosomes to the actomyosin cytoskeleton to enable dendritic cell migration. Lack of Rab7b reduces myosin II light chain phosphorylation and activation of the transcription factor TFEB (required for lysosomal signaling and fast DC migration). Rab7b directly interacts with the lysosomal Ca2+ channel TRPML1 (MCOLN1), enabling local activation of myosin II at the cell rear.\",\n      \"method\": \"Rab7b knockout/knockdown in dendritic cells, 1D and 3D migration assays, co-immunoprecipitation (Rab7b-TRPML1 interaction), myosin light chain phosphorylation assay, TFEB activation assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP for direct interaction with TRPML1, loss-of-function with multiple functional readouts (migration, MLC phosphorylation, TFEB), builds on established Rab7b-myosin II interaction\",\n      \"pmids\": [\"34494097\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Rab7B negatively regulates oligodendroglial cell morphological differentiation. Knockdown of Rab7B (but not Rab7A) recovers tunicamycin-induced ER stress-impaired morphological differentiation in FBD-102b oligodendroglial precursor cells, as measured by changes in differentiation- and myelination-related structural protein markers.\",\n      \"method\": \"siRNA knockdown of Rab7B and Rab7A, tunicamycin-induced ER stress model, morphological differentiation assay, Western blot for differentiation/myelination markers\",\n      \"journal\": \"Journal of molecular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Weak — loss-of-function with defined phenotypic readout but single lab and single method set\",\n      \"pmids\": [\"37248316\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Knockdown of Rab7B via CRISPR/CasRx restores incomplete cell shapes induced by the PMD-associated PLP1 p.Ala243Val mutation in oligodendroglial FBD-102b cells, and promotes trafficking of mutant PLP1 to LAMP1-positive organelles.\",\n      \"method\": \"CRISPR/CasRx-mediated Rab7B knockdown, immunofluorescence (LAMP1 colocalization), cell morphology assay\",\n      \"journal\": \"Neuroscience insights\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Weak — specific genetic tool with defined morphological and trafficking readouts, single lab\",\n      \"pmids\": [\"39280331\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In thrombin-stimulated platelets, a calpain-myosin 9-Rab7b axis regulates TLR4-containing α-granule trafficking. Calpain cleaves myosin-9, and the interaction between TLR4 and myosin-9 is regulated by calpain. Co-IP indicated that myosin-9 does not coordinate with Rab7b to negatively regulate TLR4 trafficking in thrombin-treated platelets (negative finding for this specific context).\",\n      \"method\": \"Co-immunoprecipitation, flow cytometry (surface TLR4), Western blot, pharmacological inhibitors (calpeptin, TMB-8, U73122), transmission electron microscopy\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single co-IP, single lab, limited mechanistic resolution for Rab7b's specific role; the main finding for Rab7b is negative (no myosin-9 coordination with Rab7b)\",\n      \"pmids\": [\"24489676\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RAB7B is a late endosome/lysosome-localized small GTPase that mediates retrograde transport from late endosomes to the trans-Golgi network (TGN) — regulating CI-MPR and sortilin trafficking, cathepsin-D maturation, and lysosomal enzyme delivery — while its GTPase cycle is controlled by the GAP TBC1D5 (potentiated by retromer); it also promotes lysosomal degradation of TLR4 and TLR9 to negatively regulate innate immune signaling, directly interacts with myosin II (via RhoA–myosin light chain phosphorylation axis) and the lysosomal Ca²⁺ channel TRPML1 to link lysosomes to the actomyosin cytoskeleton for cell migration, modulates autophagy by interacting with and restraining the Atg4B protease, and promotes protein degradation on melanosomes in keratinocytes.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RAB7B is a late endosome/lysosome-localized small GTPase that governs retrograde membrane traffic from late endosomes to the trans-Golgi network and, through this control of lysosomal trafficking, modulates innate immune signaling, autophagy, and cell migration [#3, #1]. Cycling between a lysosome-associated wild-type pool and a Golgi-localized GTP-bound state, RAB7B controls retrieval of the cargo receptors CI-MPR and sortilin — with which it interacts directly — back to the TGN, and its loss disrupts cathepsin-D maturation and lysosomal enzyme delivery [#3, #5]. Its GTPase cycle is terminated by the GAP TBC1D5, which binds RAB7B and exhibits GAP activity that is potentiated by retromer, such that TBC1D5 depletion phenocopies constitutively active RAB7B in CI-MPR/sortilin vesicle distribution [#8]. In macrophages, RAB7B drives lysosomal degradation of activated TLR4 and TLR9, thereby attenuating LPS- and CpG-induced MAPK, NF-\\u03baB, and IRF3 signaling and cytokine output [#1, #2]. RAB7B additionally links lysosomes to the actomyosin cytoskeleton: it interacts directly with myosin II and with the lysosomal Ca\\u00b2\\u207a channel TRPML1, controlling RhoA activity and myosin light-chain phosphorylation to support stress-fiber formation, adhesion, and dendritic-cell migration [#6, #10]. It also restrains autophagy by binding the protease Atg4B and limiting LC3 processing [#7].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Established RAB7B as a distinct lysosome-localized small GTPase with a cell-type-restricted expression pattern, defining the organelle and lineage context for all later mechanistic work.\",\n      \"evidence\": \"Immunofluorescence, RT-PCR, and overexpression in monocytic cell lines\",\n      \"pmids\": [\"15144907\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No biochemical demonstration of GTPase activity\", \"Molecular effectors and traffic step undefined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Answered what RAB7B does in immune cells by showing it routes activated TLR4 to lysosomes for degradation, defining a negative-feedback role in innate immune signaling.\",\n      \"evidence\": \"Reciprocal overexpression/knockdown in macrophages with TLR4 protein, cytokine, and pathway readouts\",\n      \"pmids\": [\"17395780\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Adaptor linking RAB7B to TLR4 cargo not identified\", \"GTPase cycle requirement not tested here\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Generalized the immune-regulatory mechanism by showing RAB7B also degrades TLR9 and is itself transcriptionally suppressed downstream of TLR9 activation, revealing a regulatory loop.\",\n      \"evidence\": \"Colocalization, knockdown/overexpression, cytokine ELISA and kinase assays in macrophages\",\n      \"pmids\": [\"19587007\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Selectivity for which receptor cargoes is degraded unresolved\", \"Mechanism of ERK/p38-mediated Rab7b suppression not detailed\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined the core trafficking activity of RAB7B as retrograde transport from late endosomes to the TGN, coupling its GTP state to Golgi localization and to lysosomal enzyme delivery.\",\n      \"evidence\": \"siRNA, dominant-negative (T22N) and constitutively active (Q67L) mutants, cargo-specific assays including cholera toxin and VSV-G controls\",\n      \"pmids\": [\"20375062\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct cargo receptors not yet identified\", \"Tubulation/carrier machinery undefined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identified the specific cargoes of RAB7B-dependent retrieval, showing it directly binds sortilin and controls both CI-MPR and sortilin retrieval and TGN carrier formation.\",\n      \"evidence\": \"Mutant expression, endosome-to-Golgi retrieval assays, live imaging, Rab7b-sortilin co-IP\",\n      \"pmids\": [\"22708738\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether sortilin binding is direct vs complex-mediated not structurally resolved\", \"GAP/GEF controlling the cycle still unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Extended RAB7B function to hematopoietic differentiation, linking it to NF-\\u03baB/IL-6 signaling and STAT3-GATA-1 association during megakaryocytic differentiation.\",\n      \"evidence\": \"siRNA/overexpression, pathway inhibitors, STAT3-GATA-1 co-IP, differentiation marker flow cytometry\",\n      \"pmids\": [\"20953574\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Connection between trafficking role and NF-\\u03baB activation mechanistically unclear\", \"Single lineage context\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Connected RAB7B to the cytoskeleton by establishing direct binding to myosin II and control of RhoA/MLC signaling, explaining how RAB7B vesicles move and how it influences adhesion and migration.\",\n      \"evidence\": \"Pulldown for direct interaction, myosin II depletion/inhibition, RhoA and MLC phosphorylation assays, migration assays\",\n      \"pmids\": [\"25217632\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs indirect basis of RhoA regulation unresolved\", \"How GTPase cycle gates myosin engagement unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Revealed a role in autophagy regulation: RAB7B binds the protease Atg4B and restrains LC3 processing, so its loss elevates autophagic flux.\",\n      \"evidence\": \"Rab7b-Atg4B co-IP, colocalization, siRNA knockdown with multiple autophagic flux readouts\",\n      \"pmids\": [\"28835545\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether binding directly inhibits Atg4B catalysis not shown biochemically\", \"Link to retrograde trafficking role unclear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified TBC1D5 as the GAP that terminates the RAB7B GTPase cycle, with retromer potentiation, placing RAB7B in a defined regulatory circuit for CI-MPR/sortilin retrieval.\",\n      \"evidence\": \"TBC-domain siRNA screen, in vitro GAP assay, TBC1D5-Rab7b co-IP, vesicle-number phenotypes\",\n      \"pmids\": [\"30111580\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"GEF activating RAB7B not identified\", \"Structural basis of TBC1D5-retromer-Rab7b coupling unresolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrated a tissue-specific function in keratinocytes, where RAB7B is required for degradation of incorporated melanosomes.\",\n      \"evidence\": \"Rab localization screen, CRISPR/Cas9 KO and siRNA with melanosome protein degradation probe\",\n      \"pmids\": [\"32037382\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular effectors on melanosomes unidentified\", \"Relation to TGN retrieval role unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Integrated lysosomal and cytoskeletal roles by showing RAB7B binds TRPML1 to enable local myosin II activation and TFEB signaling driving dendritic-cell migration.\",\n      \"evidence\": \"Rab7b KO/KD in dendritic cells, 3D migration assays, Rab7b-TRPML1 co-IP, MLC phosphorylation and TFEB assays\",\n      \"pmids\": [\"34494097\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Ca2+ flux through TRPML1 is spatially restricted by RAB7B not resolved\", \"Direct vs indirect TFEB regulation unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Implicated RAB7B in oligodendroglial differentiation, where its knockdown rescues ER-stress-impaired morphological differentiation, distinguishing it from RAB7A.\",\n      \"evidence\": \"siRNA of Rab7B vs Rab7A in a tunicamycin ER-stress model with differentiation markers\",\n      \"pmids\": [\"37248316\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking RAB7B to ER stress/differentiation undefined\", \"Single cell-line model\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Extended the oligodendroglial role to disease, showing RAB7B knockdown rescues morphology in cells expressing a PMD-associated PLP1 mutant and reroutes mutant PLP1 to lysosomes.\",\n      \"evidence\": \"CRISPR/CasRx knockdown with LAMP1 colocalization and morphology assays\",\n      \"pmids\": [\"39280331\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal trafficking mechanism for mutant PLP1 not defined\", \"Single model system\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The activating GEF for RAB7B and a unified structural model coupling its GTPase cycle to retrograde retrieval, cytoskeletal engagement, and Atg4B regulation remain undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No GEF identified\", \"No structure of RAB7B with its effectors\", \"Mechanistic unification of trafficking, immune, and migration roles lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003924\", \"supporting_discovery_ids\": [3, 5, 8]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [6, 10]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [0, 1, 2, 3]},\n      {\"term_id\": \"GO:0005770\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [3, 5]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [3, 5]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [3, 5, 8]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"SORT1\", \"TBC1D5\", \"MYH9\", \"MCOLN1\", \"ATG4B\", \"TLR4\", \"TLR9\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":6,"faith_pct":83.33333333333333}}