{"gene":"UVRAG","run_date":"2026-06-11T09:02:06","timeline":{"discoveries":[{"year":2006,"finding":"UVRAG associates with the Beclin1-Bcl-2-PI(3)KC3 multiprotein complex and positively activates PI(3)KC3 lipid kinase activity; UVRAG and Beclin1 interdependently induce autophagy, and UVRAG was identified as a positive regulator of the Beclin1-PI(3)KC3 complex that promotes autophagy and suppresses tumor cell growth.","method":"Co-immunoprecipitation, overexpression and knockdown in human colon cancer cells, in vitro PI3K lipid kinase assay","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP with functional lipid kinase assay, replicated across multiple labs","pmids":["16799551"],"is_preprint":false},{"year":2007,"finding":"Bif-1 (Endophilin B1) interacts with UVRAG through its SH3 domain to join the UVRAG-Beclin1 complex and activate PI(3)KC3; both the BAR and SH3 domains of Bif-1 are required for PI(3)KC3 activation and autophagosome formation.","method":"Co-immunoprecipitation, domain mapping, siRNA knockdown, fluorescence microscopy of autophagosome formation","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP with domain mapping and functional autophagy readout, replicated in multiple cell systems","pmids":["17891140"],"is_preprint":false},{"year":2008,"finding":"UVRAG is the mammalian ortholog of yeast Vps38 and forms a distinct PI3K complex (with Vps34, p150/VPS15, and Beclin1) that is mutually exclusive from the Atg14-containing complex; UVRAG primarily localizes to Rab9-positive late endosomes, while Atg14 localizes to isolation membranes/phagophores.","method":"Computational homology analysis, co-immunoprecipitation, immunofluorescence localization in HeLa cells, siRNA knockdown","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP plus localization, replicated in multiple studies","pmids":["18843052"],"is_preprint":false},{"year":2008,"finding":"UVRAG promotes autophagosome maturation and endocytic trafficking by recruiting class C Vps tethering complex (HOPS complex) and Rab7 on late endosomes, thereby facilitating fusion with lysosomes.","method":"Co-immunoprecipitation, localization studies, functional maturation assays","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — single lab, Co-IP-based; mechanistic model supported by multiple downstream papers","pmids":["18612260"],"is_preprint":false},{"year":2010,"finding":"A specific PI3K-III sub-complex containing VPS15, VPS34, Beclin1, UVRAG and BIF-1 (but not ATG14L) regulates both growth factor receptor degradation (EGFR downregulation) and cytokinesis; UVRAG and BIF-1 localize to the midbody during cytokinesis.","method":"siRNA-mediated depletion of individual subunits, high-content microscopy-based assays, immunofluorescence localization","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — orthogonal functional assays with subcellular localization, single lab","pmids":["20643123"],"is_preprint":false},{"year":2011,"finding":"UVRAG has anti-apoptotic activity through direct interaction with Bax via its C2 domain; UVRAG inhibits Bax translocation from cytosol to mitochondria during chemotherapy- or UV-induced apoptosis. Deletion of the C2 domain abolishes Bax binding and anti-apoptotic activity.","method":"Co-immunoprecipitation, domain deletion mutants, mitochondrial fractionation, cell death assays","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain mapping with functional apoptosis readout, Co-IP, single lab","pmids":["21606679"],"is_preprint":false},{"year":2011,"finding":"UVRAG loss-of-function in Drosophila impairs endocytic trafficking (not autophagy), causing endosomal accumulation of Notch and abnormally enhanced Notch signaling, which leads to defective organ rotation; this phenotype is rescued by knockdown of Notch or expression of dominant-negative Mastermind.","method":"Drosophila loss-of-function genetics, epistasis analysis, immunofluorescence, dominant-negative rescue","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with multiple orthogonal rescue experiments in Drosophila model","pmids":["21729695"],"is_preprint":false},{"year":2012,"finding":"UVRAG promotes DNA double-strand-break repair by directly binding and activating DNA-PK in nonhomologous end joining (NHEJ); UVRAG also localizes to centrosomes and physically associates with CEP63, and disruption of this association causes centrosome instability and aneuploidy. These functions are independent of autophagy.","method":"Co-immunoprecipitation, in vitro DNA-PK kinase assay, immunofluorescence, genetic instability assays, irradiation sensitivity","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro kinase assay plus Co-IP plus localization, multiple functional readouts, single lab","pmids":["22542840"],"is_preprint":false},{"year":2012,"finding":"The Beclin1 coiled-coil domain forms a metastable antiparallel homodimer with imperfect a-d' pairings; Atg14L and UVRAG promote transition from this homodimer to stable Beclin1-Atg14L or Beclin1-UVRAG heterodimers. Beclin1 mutants with enhanced self-interaction show altered interactions with Atg14L or UVRAG.","method":"Crystal structure of Beclin1 coiled-coil domain, mutagenesis, co-immunoprecipitation, in vitro binding assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure plus mutagenesis plus Co-IP, single lab with multiple orthogonal methods","pmids":["22314358"],"is_preprint":false},{"year":2013,"finding":"UVRAG is a PtdIns(3)P-binding protein that depends on PtdIns(3)P for ER localization; UVRAG interacts with RINT-1 as an integral component of the ER tethering complex to couple phosphoinositide metabolism to COPI-vesicle tethering. During autophagy, UVRAG dissociates from the ER tether and cooperates with the Bif-1-Beclin1-PI(3)KC3 complex to mobilize Atg9 translocation for autophagosome formation.","method":"Co-immunoprecipitation, PtdIns(3)P binding assay, UVRAG knockdown, live-cell imaging, COPI vesicle trafficking assay","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — PtdIns(3)P binding assay plus Co-IP plus functional trafficking readouts, multiple orthogonal methods, single lab","pmids":["24056303"],"is_preprint":false},{"year":2014,"finding":"mTORC1 directly phosphorylates UVRAG under nutrient-enriched conditions; this phosphorylation promotes UVRAG association with RUBICON, enhancing RUBICON's antagonizing effect on autophagosome maturation. Upon nutrient deprivation and dephosphorylation, UVRAG is released from RUBICON to interact with the HOPS complex, enhancing autophagosome and endosome maturation and facilitating lysosomal EGFR degradation.","method":"In vitro mTORC1 kinase assay, phosphorylation site mapping, co-immunoprecipitation, autophagy flux assays, EGFR degradation assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay plus Co-IP plus multiple functional readouts, single lab","pmids":["25533187"],"is_preprint":false},{"year":2014,"finding":"Beclin1 deficiency causes complete loss of the UVRAG-VPS34 complex and associated lipid kinase activity; the UVRAG-Beclin1 interaction underlies Beclin1's function in endocytosis including Rab5-associated early endosome formation and endosome maturation. UVRAG overexpression rescues impaired p40phox-linked endosome formation caused by Beclin1 deficiency, while coiled-coil domain-truncated Beclin1 (UVRAG-binding mutant) does not.","method":"Conditional knockout mice, PI3K lipid kinase assay, immunofluorescence, fractionation, rescue with UVRAG mutants","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro kinase assay, genetic knockout, domain-specific rescue experiments, multiple orthogonal methods","pmids":["25275521"],"is_preprint":false},{"year":2014,"finding":"UVRAG is required for the entry of influenza A virus and vesicular stomatitis virus by mediating viral endocytic transport and membrane penetration through interactions with the class C vacuolar protein sorting (C-Vps) tethering complex and endosomal glutamine-containing SNAREs (STX7, STX8, Vti1b), leading to assembly of a fusogenic VAMP8-containing trans-SNARE complex. UVRAG stimulates VAMP8 translocation to virus-bearing endosomes.","method":"Co-immunoprecipitation, siRNA knockdown, viral entry assays, SNARE complex reconstitution, immunofluorescence","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional viral entry assay plus SNARE complex assembly, multiple orthogonal methods, single lab","pmids":["24550300"],"is_preprint":false},{"year":2014,"finding":"In Drosophila wing development, the UVRAG-containing PI3K(III) complex (not the Atg14-containing complex) is specifically required for receptor downregulation through endolysosomal degradation (Notch, Wingless) and for epithelial cell polarity, while the Atg14-containing complex is involved in autophagosome formation.","method":"Drosophila loss-of-function genetics, UVRAG/Atg14/Atg6 knockdown, immunofluorescence, epistasis","journal":"BioMed research international","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with multiple pathway readouts in Drosophila model","pmids":["25006588"],"is_preprint":false},{"year":2015,"finding":"mTOR directly phosphorylates UVRAG at S550 and S571, activating VPS34 lipid kinase activity; disruption of these phosphorylation sites reduces VPS34 lipid kinase activity and impairs autolysosomal tubulation (autophagosome-lysosome reformation), leading to increased lysosomal tubules and massive cell death under nutrient stress.","method":"In vitro mTOR kinase assay, phosphorylation site mutagenesis, VPS34 lipid kinase assay, live-cell imaging of lysosomal tubulation","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay plus mutagenesis plus VPS34 lipid kinase assay plus imaging, multiple orthogonal methods, single lab","pmids":["26139536"],"is_preprint":false},{"year":2015,"finding":"Cancer-derived UVRAG frameshift (FS) mutation produces a truncated UVRAG protein that acts in a dominant-negative manner to abrogate normal UVRAG functions in autophagy, centrosome stability, and DNA repair; UVRAGFS promotes CRC metastasis through Rac1 activation and EMT independently of autophagy, and confers chemosensitivity due to DNA repair defects.","method":"Expression of UVRAGFS in CRC cells, dominant-negative functional assays, Rac1 activity assays, DNA repair assays, in vivo xenograft","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal functional assays with dominant-negative mutant, in vivo xenograft, single lab","pmids":["26234763"],"is_preprint":false},{"year":2016,"finding":"UVRAG localizes to UV-induced photolesions and associates with DDB1 to promote assembly and activity of the CRL4(DDB2) ubiquitin ligase complex (DDB2-DDB1-Cul4A-Roc1), leading to efficient XPC recruitment and global genomic nucleotide excision repair (NER). UVRAG depletion decreases substrate handover to XPC and confers UV-damage hypersensitivity.","method":"Co-immunoprecipitation, immunofluorescence localization to photolesions, NER activity assays, siRNA knockdown, Drosophila genetic model","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP plus functional NER assay plus Drosophila model for cross-species validation, multiple orthogonal methods","pmids":["27203177"],"is_preprint":false},{"year":2018,"finding":"Crystal structure of the Beclin1-UVRAG coiled-coil complex reveals a strengthened interface with both hydrophobic pairings and electrostatic complementary interactions, explaining why Beclin1-UVRAG interaction is more potent than the Beclin1 homodimer. UVRAG coiled-coil mutants with weakened Beclin1 binding fail to outcompete Atg14L and cannot promote endolysosomal EGFR degradation.","method":"Crystal structure determination, site-directed mutagenesis, competitive binding assay, EGFR degradation assay, stapled peptide design","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure plus mutagenesis plus functional assay, multiple orthogonal methods in one study","pmids":["29866835"],"is_preprint":false},{"year":2018,"finding":"UVRAG interacts with RINT-1-containing ER tethering complex and, via PtdIns(3)P binding, is required for Golgi-ER retrograde transport; during autophagy induction, UVRAG dissociates from this ER tether. Separately, UVRAG interacts with BLOC-1 complex and this interaction is required for BLOC-1 stability and BLOC-1-mediated cargo sorting to melanosomes; UVRAG is a direct transcriptional target of MITF downstream of α-MSH signaling.","method":"Co-immunoprecipitation, UVRAG knockout cells/zebrafish, melanosome biogenesis assays, ChIP/luciferase reporter for MITF target","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus zebrafish in vivo model plus functional cargo sorting assay, single lab","pmids":["30061422"],"is_preprint":false},{"year":2019,"finding":"UVRAG is ubiquitinated by SMURF1 E3 ligase at lysine residues K517 and K559 (via K29/K33-linked polyubiquitin chains), which decreases UVRAG association with RUBICON and promotes autophagosome maturation. The deubiquitinase ZRANB1 removes these chains to restore RUBICON binding and inhibit autophagy flux. CSNK1A1 phosphorylation of UVRAG at Ser522 disrupts SMURF1 binding via PPxY motif, blocking ubiquitination.","method":"In vitro ubiquitination assay, deubiquitinase assay, site-directed mutagenesis, co-immunoprecipitation, autophagy flux assays","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro ubiquitination and deubiquitinase assays plus mutagenesis plus Co-IP, multiple orthogonal methods, single lab","pmids":["30686098"],"is_preprint":false},{"year":2019,"finding":"GORASP2/GRASP55 interacts with BECN1 to facilitate assembly and membrane association of the PtdIns3K UVRAG complex, and physically links autophagosomes to lysosomes via LC3 and LAMP2 interactions to promote autophagosome-lysosome fusion.","method":"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, autophagy flux assays","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional autophagy assays, single lab","pmids":["30894053"],"is_preprint":false},{"year":2019,"finding":"In vivo, UVRAG frameshift (UVRAGFS) truncation disrupts the UVRAG-autophagy complex and impairs starvation- and LPS-induced autophagy (but not basal autophagy); UVRAGFS mice show NLRP3-inflammasome hyperactivation, increased inflammatory response, and enhanced spontaneous tumorigenesis associated with β-catenin stabilization and centrosome amplification.","method":"Inducible knock-in mouse model, autophagy flux assays, NLRP3 inflammasome activity, inflammatory and tumor phenotyping","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — inducible mouse model with multiple pathway readouts, in vivo validation across multiple pathological contexts","pmids":["31831743"],"is_preprint":false},{"year":2012,"finding":"Slamf1 recruits a Beclin1/Vps34/UVRAG complex (but not Atg14L or Rubicon) to phagosomes in macrophages; both BD and CCD domains of Beclin1 are required for Slamf1 binding. This complex regulates membrane fusion and NOX2 oxidase activity during bacterial phagocytosis.","method":"Co-immunoprecipitation, Beclin1 domain deletion mutants, NOX2 activity assay in Beclin1+/- macrophages","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with domain mapping plus functional NOX2 assay, single lab","pmids":["22493499"],"is_preprint":false},{"year":2021,"finding":"UVRAG downregulation impairs autophagy flux, leading to ectopic accumulation of p62; accumulated p62 recruits RIPK1 and induces its self-oligomerization, activating the RIPK1/RIPK3/MLKL cascade and neuronal necroptosis. UVRAG overexpression inhibits neuronal necroptosis in cell and AD mouse models.","method":"UVRAG knockdown/overexpression, AAV-mediated gene manipulation in mice, Western blot, autophagy flux assays, necroptosis signaling assays","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo rescue with UVRAG overexpression, multiple signaling readouts, single lab","pmids":["34646380"],"is_preprint":false},{"year":2022,"finding":"Miga, a mitochondrial outer-membrane ER-mitochondrial contact site protein, binds both Atg14 and Uvrag and recruits them to mitochondria; Miga-induced PI3K activity requires Uvrag, while Miga-mediated stabilization of Syx17 (a SNARE for autophagosome-lysosome fusion) requires Atg14. Miga-regulated ER-mitochondria contact sites are critical for PI3P formation.","method":"Co-immunoprecipitation, Miga mutant Drosophila, PI3P assay, immunofluorescence, autophagy flux assays","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus Drosophila genetic model plus PI3P assay, single lab","pmids":["36323251"],"is_preprint":false},{"year":2023,"finding":"Upon starvation, UVRAG localizes to ER-phagy sites (ERPHS) and interacts with ER-phagy cargo receptors FAM134B, ATL3, and RTN3L; UVRAG regulates oligomerization of these receptors and facilitates recruitment of Atg8 family proteins to promote efficient ER-phagy (reticulophagy) initiation and clearance of pathogenic proinsulin aggregates. This function is independent of UVRAG's role as a PI3KC3-II subunit.","method":"Co-immunoprecipitation, immunofluorescence, siRNA knockdown, ER-phagy flux assays, receptor oligomerization assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional ER-phagy assay plus independence from PI3KC3-II established by domain analysis, multiple orthogonal methods, single lab","pmids":["37902287"],"is_preprint":false},{"year":2020,"finding":"UVRAG is required for efficient filovirus (Ebola virus and other pathogenic filoviruses) entry; UVRAG depletion impairs delivery of EBOV virions to NPC1+ compartments. Deletion of the UVRAG domain required for HOPS complex interaction abolishes EBOV entry, demonstrating that UVRAG coordinates with the HOPS tethering complex for endolysosomal trafficking of virions to the filoviral receptor NPC1.","method":"Inducible CRISPR/Cas9 knockout, viral entry assays, immunofluorescence of virion trafficking, UVRAG domain deletion mutants","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — CRISPR knockout plus domain deletion mutants plus functional viral entry and trafficking assays, multiple orthogonal methods","pmids":["32493822"],"is_preprint":false},{"year":2015,"finding":"HCV differentially induces expression of Rubicon (early, inhibits autophagosome maturation) and UVRAG (delayed, stimulates maturation); UVRAG overexpression facilitates autophagosome maturation and suppresses HCV replication, while Rubicon promotes viral replication. The HCV NS4B protein is sufficient to induce Rubicon expression and autophagosome accumulation.","method":"siRNA knockdown and overexpression of UVRAG/Rubicon, HCV replication assays, autophagosome maturation assays, NS4B expression","journal":"PLoS pathogens","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA plus overexpression with functional viral and autophagy readouts, single lab","pmids":["25807108"],"is_preprint":false},{"year":2015,"finding":"In T cells, UVRAG deficiency causes defects in peripheral naive T-cell homeostasis (reduced homeostatic proliferation, impaired CD8+ T-cell responses to LCMV infection) through autophagy-independent mechanisms; UVRAG-deficient T-cells show normal mitochondrial clearance and activation-induced autophagy, suggesting an autophagy-independent role in T-cell homeostasis.","method":"T-cell-specific conditional knockout mice, LCMV infection model, autophagy flux assays, mitophagy assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO mice with multiple functional readouts, negative result for autophagy dependence strengthens specificity claim","pmids":["25583492"],"is_preprint":false},{"year":2013,"finding":"UVRAG is essential for autophagic flux and cardiac function in vivo; UVRAG-deficient mice develop age-related cardiomyopathy with impaired autophagic flux (autophagosome accumulation without progression), while basal autophagosome formation is preserved, indicating UVRAG's primary role is in autophagosome maturation.","method":"PiggyBac transposon gene disruption mouse model, autophagic flux assay with chloroquine, cardiac function assessment","journal":"Cardiovascular research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo mouse knockout with autophagy flux assay and cardiac functional readout, single lab","pmids":["24081163"],"is_preprint":false},{"year":2012,"finding":"Akt1 inhibits autophagy by downregulating UVRAG expression at the transcriptional level; this effect is kinase-activity independent. Dominant-negative Akt1 also reduces UVRAG, and re-introduction of UVRAG rescues autophagic activity in Akt1-overexpressing cells.","method":"Akt1 overexpression and siRNA in 293T and breast cancer cells, UVRAG mRNA quantification, LC3 flux assays, UV-induced autophagy rescue","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — transcriptional downregulation shown by expression analysis plus functional rescue, single lab","pmids":["23200933"],"is_preprint":false}],"current_model":"UVRAG (the mammalian ortholog of yeast Vps38) is a multifunctional tumor suppressor that serves as a subunit of the Beclin1-VPS34-VPS15 class III PI3K complex II, where it promotes autophagosome maturation by recruiting the HOPS complex/Rab7 for lysosomal fusion, regulates endolysosomal trafficking, mediates Golgi-ER retrograde transport via the RINT-1 tether, initiates ER-phagy by interacting with cargo receptors, facilitates viral entry through SNARE complex assembly, promotes nucleotide excision repair via CRL4(DDB2) E3 ligase activation, repairs DNA double-strand breaks by activating DNA-PK in NHEJ, maintains centrosome stability through CEP63 interaction, and drives melanogenesis via BLOC-1; its activity is regulated by mTORC1 phosphorylation (promoting RUBICON association to inhibit maturation), SMURF1 ubiquitination (promoting autophagosome maturation by releasing RUBICON), and CSNK1A1 phosphorylation (blocking SMURF1-mediated ubiquitination)."},"narrative":{"mechanistic_narrative":"UVRAG is the mammalian ortholog of yeast Vps38 and a defining subunit of a distinct class III PI3K complex (Vps34-VPS15-Beclin1-UVRAG, with Bif-1/Endophilin B1), where it positively activates VPS34 lipid kinase activity and acts as a tumor suppressor [PMID:16799551, PMID:17891140, PMID:18843052]. UVRAG outcompetes Atg14L for the Beclin1 coiled-coil to form a strengthened, more stable heterodimer, partitioning these mutually exclusive complexes toward separate functions [PMID:22314358, PMID:29866835]. The UVRAG complex governs the maturation arm of the pathway: localizing to Rab9/Rab7-positive late endosomes, it recruits the HOPS/class C Vps tethering complex to drive autophagosome and endosome fusion with lysosomes and lysosomal degradation of cargoes such as EGFR [PMID:18612260, PMID:25533187, PMID:29866835], and it also mediates Rab5-associated early endosome formation and growth-factor receptor downregulation [PMID:20643123, PMID:25275521, PMID:25006588]. This maturation activity is tightly regulated: mTORC1 phosphorylates UVRAG (at S550/S571) to promote RUBICON association and inhibit maturation under nutrient-rich conditions while also sustaining VPS34 activity for autolysosome reformation [PMID:25533187, PMID:26139536], SMURF1 ubiquitinates UVRAG (K517/K559) to release it from RUBICON and accelerate maturation—an event reversed by the deubiquitinase ZRANB1 and blocked by CSNK1A1 phosphorylation [PMID:30686098]. As a PtdIns(3)P-binding protein, UVRAG additionally engages the RINT-1 ER tethering complex to support Golgi-ER retrograde COPI-vesicle transport, dissociating from this tether upon autophagy induction to mobilize Atg9 [PMID:24056303, PMID:30061422], and independently of its PI3KC3-II role it initiates ER-phagy by binding and organizing the cargo receptors FAM134B, ATL3 and RTN3L [PMID:37902287]. Beyond membrane trafficking, UVRAG carries autophagy-independent genome-maintenance functions: it activates DNA-PK in nonhomologous end joining, associates with CEP63 to preserve centrosome stability, and binds DDB1 to assemble the CRL4(DDB2) ligase for nucleotide excision repair [PMID:22542840, PMID:27203177]. It further mediates SNARE-dependent viral entry [PMID:24550300, PMID:32493822] and BLOC-1-dependent melanogenesis [PMID:30061422]. Cancer-derived frameshift truncation acts dominant-negatively to abrogate autophagy, centrosome stability and DNA repair, driving Rac1-mediated metastasis, NLRP3 inflammasome hyperactivation and tumorigenesis [PMID:26234763, PMID:31831743].","teleology":[{"year":2006,"claim":"Established UVRAG as a functional component of the autophagy machinery rather than merely a UV-resistance gene, by showing it activates the Beclin1-associated lipid kinase and suppresses tumor growth.","evidence":"Co-IP, knockdown, and in vitro PI3K lipid kinase assay in colon cancer cells","pmids":["16799551"],"confidence":"High","gaps":["Did not resolve how UVRAG enters the complex relative to other regulators","Mechanism of tumor suppression beyond autophagy not addressed"]},{"year":2007,"claim":"Identified Bif-1/Endophilin B1 as a UVRAG partner that bridges into the Beclin1-VPS34 complex, linking membrane curvature/SH3-BAR domains to PI3KC3 activation and autophagosome formation.","evidence":"Co-IP with domain mapping, siRNA, fluorescence microscopy","pmids":["17891140"],"confidence":"High","gaps":["Did not define stoichiometry of UVRAG-Bif-1-Beclin1 assembly","Membrane source of curvature not identified"]},{"year":2008,"claim":"Defined UVRAG as the Vps38 ortholog forming a complex mutually exclusive from Atg14, explaining functional division of labor by distinct subcellular localization (late endosomes vs phagophore).","evidence":"Homology analysis, Co-IP, immunofluorescence, siRNA in HeLa","pmids":["18843052","18612260"],"confidence":"High","gaps":["HOPS/Rab7 recruitment mechanism was single-lab Co-IP at this stage","Switch between complexes not mechanistically defined"]},{"year":2012,"claim":"Demonstrated UVRAG functions outside autophagy in genome maintenance, directly activating DNA-PK for NHEJ and stabilizing centrosomes via CEP63.","evidence":"Co-IP, in vitro DNA-PK kinase assay, immunofluorescence, genetic instability and irradiation assays","pmids":["22542840"],"confidence":"High","gaps":["Single lab","Structural basis of DNA-PK activation not resolved","Relationship between repair and trafficking pools of UVRAG unclear"]},{"year":2012,"claim":"Resolved the structural basis for complex assembly, showing Atg14L and UVRAG convert a metastable Beclin1 homodimer into stable heterodimers.","evidence":"Crystal structure of Beclin1 coiled-coil, mutagenesis, Co-IP","pmids":["22314358"],"confidence":"High","gaps":["Did not capture full UVRAG-bound complex","Cellular triggers of heterodimer switching not defined"]},{"year":2013,"claim":"Showed UVRAG is a PtdIns(3)P-binding protein that couples phosphoinositide metabolism to membrane tethering, working through RINT-1 at the ER and switching to autophagosome biogenesis upon induction.","evidence":"PtdIns(3)P binding assay, Co-IP, COPI vesicle and live-cell trafficking assays","pmids":["24056303"],"confidence":"High","gaps":["Signal driving ER-tether dissociation not identified","How Atg9 mobilization is mechanistically linked unclear"]},{"year":2014,"claim":"Defined nutrient-responsive regulation: mTORC1 phosphorylation of UVRAG toggles between RUBICON-bound (maturation off) and HOPS-bound (maturation on) states and sustains VPS34 activity for lysosome reformation.","evidence":"In vitro mTOR(C1) kinase assays, phosphosite mapping (S550/S571), Co-IP, autophagy flux and EGFR degradation, lysosomal tubulation imaging","pmids":["25533187","26139536"],"confidence":"High","gaps":["Phosphatase responsible for dephosphorylation not identified","Quantitative occupancy of RUBICON vs HOPS states not measured"]},{"year":2014,"claim":"Genetically separated UVRAG-complex functions, establishing Beclin1-UVRAG as the endocytic/maturation arm required for receptor degradation and endosome formation in vivo and across species.","evidence":"Conditional knockout mice with lipid kinase and rescue assays; Drosophila loss-of-function epistasis","pmids":["25275521","25006588"],"confidence":"High","gaps":["Tissue-specific requirements not fully mapped","Distinction of early- vs late-endosome roles incomplete"]},{"year":2014,"claim":"Revealed a trafficking-dependent role in pathogen entry, with UVRAG coordinating C-Vps tethering and SNARE assembly to deliver virions through the endolysosomal system.","evidence":"Co-IP, siRNA, viral entry assays, SNARE complex reconstitution","pmids":["24550300"],"confidence":"High","gaps":["Generalizability across virus families addressed only later","Direct vs indirect SNARE engagement not fully resolved"]},{"year":2016,"claim":"Extended UVRAG genome-maintenance roles to nucleotide excision repair, showing it promotes CRL4(DDB2) ligase assembly and XPC handover at photolesions.","evidence":"Co-IP, localization to photolesions, NER activity assays, siRNA, Drosophila model","pmids":["27203177"],"confidence":"High","gaps":["How UVRAG is recruited to DNA damage sites unclear","Relationship to its lipid-kinase complex not addressed"]},{"year":2018,"claim":"Provided atomic-resolution rationale for why UVRAG outcompetes Atg14L for Beclin1, linking interface strength to endolysosomal EGFR degradation.","evidence":"Crystal structure of Beclin1-UVRAG coiled-coil, mutagenesis, competitive binding and EGFR degradation assays, stapled peptides","pmids":["29866835"],"confidence":"High","gaps":["In vivo competition dynamics not quantified","Regulation of competition by post-translational modifications not integrated"]},{"year":2018,"claim":"Broadened UVRAG trafficking roles to Golgi-ER retrograde transport and to BLOC-1-dependent melanogenesis, placing UVRAG transcriptionally downstream of MITF/α-MSH signaling.","evidence":"Co-IP, knockout cells/zebrafish, melanosome biogenesis assays, ChIP/luciferase","pmids":["30061422"],"confidence":"Medium","gaps":["Single lab","Mechanism of BLOC-1 stabilization by UVRAG not defined","Whether melanogenic and trafficking pools overlap unclear"]},{"year":2019,"claim":"Defined ubiquitin- and phospho-regulatory control of the UVRAG-RUBICON switch, identifying SMURF1, ZRANB1, and CSNK1A1 as opposing regulators of autophagosome maturation.","evidence":"In vitro ubiquitination/deubiquitination assays, site mutagenesis (K517/K559, S522), Co-IP, autophagy flux","pmids":["30686098"],"confidence":"High","gaps":["Integration with mTORC1 phosphorylation not fully reconciled","Signals controlling SMURF1/ZRANB1 balance unknown"]},{"year":2019,"claim":"Validated UVRAG functions in vivo and tied loss-of-function to inflammasome hyperactivation and tumorigenesis, showing GRASP55 facilitates UVRAG-complex assembly and fusion.","evidence":"Inducible knock-in mouse model (UVRAGFS) with autophagy, NLRP3, and tumor phenotyping; Co-IP and flux assays for GORASP2","pmids":["31831743","30894053"],"confidence":"High","gaps":["Causal chain from autophagy defect to β-catenin/centrosome phenotypes incomplete","GRASP55 role replicated only in single lab"]},{"year":2023,"claim":"Identified a PI3KC3-II-independent role for UVRAG in ER-phagy initiation, organizing cargo-receptor oligomerization and Atg8 recruitment to clear pathogenic protein aggregates.","evidence":"Co-IP, immunofluorescence, siRNA, ER-phagy flux and receptor oligomerization assays","pmids":["37902287"],"confidence":"High","gaps":["Structural basis of receptor oligomerization control unknown","How UVRAG is targeted to ERPHS not defined"]},{"year":null,"claim":"How UVRAG's distinct functional pools (PI3KC3-II maturation, DNA repair, ER-phagy, centrosome stability, viral entry) are physically and temporally partitioned within a cell remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model for how a single protein is allocated across mutually independent functions","Stoichiometry and interconversion of complexes in vivo not measured"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[9,18]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[3,12,25]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,7,16]}],"localization":[{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[2,3,11]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[9,18,25]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[7]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[16]}],"pathway":[{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[0,3,10,25]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[3,9,12]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[7,16]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[10,19]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[15,21]}],"complexes":["Beclin1-VPS34-VPS15-UVRAG PI3KC3 complex II","HOPS/class C Vps tethering complex","RINT-1 ER tethering complex","CRL4(DDB2) ubiquitin ligase complex"],"partners":["BECN1","BIF-1/SH3GLB1","RUBICON","SMURF1","CEP63","DDB1","RINT1","FAM134B"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9P2Y5","full_name":"UV radiation resistance-associated gene protein","aliases":["p63"],"length_aa":699,"mass_kda":78.2,"function":"Versatile protein that is involved in regulation of different cellular pathways implicated in membrane trafficking. Involved in regulation of the COPI-dependent retrograde transport from Golgi and the endoplasmic reticulum by associating with the NRZ complex; the function is dependent on its binding to phosphatidylinositol 3-phosphate (PtdIns(3)P) (PubMed:16799551, PubMed:18552835, PubMed:20643123, PubMed:24056303, PubMed:28306502). During autophagy acts as a regulatory subunit of the alternative PI3K complex II (PI3KC3-C2) that mediates formation of phosphatidylinositol 3-phosphate and is believed to be involved in maturation of autophagosomes and endocytosis. Activates lipid kinase activity of PIK3C3 (PubMed:16799551, PubMed:20643123, PubMed:24056303, PubMed:28306502). Involved in the regulation of degradative endocytic trafficking and cytokinesis, and in regulation of ATG9A transport from the Golgi to the autophagosome; the functions seems to implicate its association with PI3KC3-C2 (PubMed:16799551, PubMed:20643123, PubMed:24056303). Involved in maturation of autophagosomes and degradative endocytic trafficking independently of BECN1 but depending on its association with a class C Vps complex (possibly the HOPS complex); the association is also proposed to promote autophagosome recruitment and activation of Rab7 and endosome-endosome fusion events (PubMed:18552835, PubMed:28306502). Enhances class C Vps complex (possibly HOPS complex) association with a SNARE complex and promotes fusogenic SNARE complex formation during late endocytic membrane fusion (PubMed:24550300). In case of negative-strand RNA virus infection is required for efficient virus entry, promotes endocytic transport of virions and is implicated in a VAMP8-specific fusogenic SNARE complex assembly (PubMed:24550300) Involved in maintaining chromosomal stability. Promotes DNA double-strand break (DSB) repair by association with DNA-dependent protein kinase complex DNA-PK and activating it in non-homologous end joining (NHEJ) (PubMed:22542840). Required for centrosome stability and proper chromosome segregation (PubMed:22542840)","subcellular_location":"Late endosome; Lysosome; Cytoplasmic vesicle, autophagosome; Early endosome; Endoplasmic reticulum; Midbody; Chromosome, centromere","url":"https://www.uniprot.org/uniprotkb/Q9P2Y5/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/UVRAG","classification":"Not Classified","n_dependent_lines":65,"n_total_lines":1208,"dependency_fraction":0.05380794701986755},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000198382","cell_line_id":"CID001854","localizations":[{"compartment":"cytoplasmic","grade":3},{"compartment":"vesicles","grade":3}],"interactors":[{"gene":"BECN1","stoichiometry":10.0},{"gene":"PIK3C3","stoichiometry":10.0},{"gene":"KIAA0226","stoichiometry":10.0},{"gene":"KIAA0226L","stoichiometry":10.0},{"gene":"BLVRA","stoichiometry":0.2},{"gene":"POLR2E","stoichiometry":0.2},{"gene":"POLR2F","stoichiometry":0.2},{"gene":"POLR2H","stoichiometry":0.2},{"gene":"POLR2K","stoichiometry":0.2},{"gene":"POLR3B","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID001854","total_profiled":1310},"omim":[{"mim_id":"615687","title":"BECLIN 2; BECN2","url":"https://www.omim.org/entry/615687"},{"mim_id":"613516","title":"RUN DOMAIN- AND CYSTEINE-RICH DOMAIN-CONTAINING BECLIN-1-INTERACTING PROTEIN; RUBCN","url":"https://www.omim.org/entry/613516"},{"mim_id":"613515","title":"AUTOPHAGY-RELATED 14; ATG14","url":"https://www.omim.org/entry/613515"},{"mim_id":"605474","title":"TOLL-LIKE RECEPTOR 9; TLR9","url":"https://www.omim.org/entry/605474"},{"mim_id":"604378","title":"BECLIN 1; BECN1","url":"https://www.omim.org/entry/604378"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/UVRAG"},"hgnc":{"alias_symbol":["VPS38"],"prev_symbol":[]},"alphafold":{"accession":"Q9P2Y5","domains":[{"cath_id":"2.60.40,2.60.40","chopping":"43-167","consensus_level":"high","plddt":83.6871,"start":43,"end":167},{"cath_id":"1.10.418.40","chopping":"330-463","consensus_level":"high","plddt":90.8878,"start":330,"end":463},{"cath_id":"1.20.5","chopping":"194-273","consensus_level":"medium","plddt":95.6536,"start":194,"end":273}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9P2Y5","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9P2Y5-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9P2Y5-F1-predicted_aligned_error_v6.png","plddt_mean":67.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=UVRAG","jax_strain_url":"https://www.jax.org/strain/search?query=UVRAG"},"sequence":{"accession":"Q9P2Y5","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9P2Y5.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9P2Y5/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9P2Y5"}},"corpus_meta":[{"pmid":"18843052","id":"PMC_18843052","title":"Beclin 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\"method\": \"Co-immunoprecipitation, overexpression and knockdown in human colon cancer cells, in vitro PI3K lipid kinase assay\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP with functional lipid kinase assay, replicated across multiple labs\",\n      \"pmids\": [\"16799551\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Bif-1 (Endophilin B1) interacts with UVRAG through its SH3 domain to join the UVRAG-Beclin1 complex and activate PI(3)KC3; both the BAR and SH3 domains of Bif-1 are required for PI(3)KC3 activation and autophagosome formation.\",\n      \"method\": \"Co-immunoprecipitation, domain mapping, siRNA knockdown, fluorescence microscopy of autophagosome formation\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP with domain mapping and functional autophagy readout, replicated in multiple cell systems\",\n      \"pmids\": [\"17891140\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"UVRAG is the mammalian ortholog of yeast Vps38 and forms a distinct PI3K complex (with Vps34, p150/VPS15, and Beclin1) that is mutually exclusive from the Atg14-containing complex; UVRAG primarily localizes to Rab9-positive late endosomes, while Atg14 localizes to isolation membranes/phagophores.\",\n      \"method\": \"Computational homology analysis, co-immunoprecipitation, immunofluorescence localization in HeLa cells, siRNA knockdown\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP plus localization, replicated in multiple studies\",\n      \"pmids\": [\"18843052\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"UVRAG promotes autophagosome maturation and endocytic trafficking by recruiting class C Vps tethering complex (HOPS complex) and Rab7 on late endosomes, thereby facilitating fusion with lysosomes.\",\n      \"method\": \"Co-immunoprecipitation, localization studies, functional maturation assays\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — single lab, Co-IP-based; mechanistic model supported by multiple downstream papers\",\n      \"pmids\": [\"18612260\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"A specific PI3K-III sub-complex containing VPS15, VPS34, Beclin1, UVRAG and BIF-1 (but not ATG14L) regulates both growth factor receptor degradation (EGFR downregulation) and cytokinesis; UVRAG and BIF-1 localize to the midbody during cytokinesis.\",\n      \"method\": \"siRNA-mediated depletion of individual subunits, high-content microscopy-based assays, immunofluorescence localization\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — orthogonal functional assays with subcellular localization, single lab\",\n      \"pmids\": [\"20643123\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"UVRAG has anti-apoptotic activity through direct interaction with Bax via its C2 domain; UVRAG inhibits Bax translocation from cytosol to mitochondria during chemotherapy- or UV-induced apoptosis. Deletion of the C2 domain abolishes Bax binding and anti-apoptotic activity.\",\n      \"method\": \"Co-immunoprecipitation, domain deletion mutants, mitochondrial fractionation, cell death assays\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain mapping with functional apoptosis readout, Co-IP, single lab\",\n      \"pmids\": [\"21606679\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"UVRAG loss-of-function in Drosophila impairs endocytic trafficking (not autophagy), causing endosomal accumulation of Notch and abnormally enhanced Notch signaling, which leads to defective organ rotation; this phenotype is rescued by knockdown of Notch or expression of dominant-negative Mastermind.\",\n      \"method\": \"Drosophila loss-of-function genetics, epistasis analysis, immunofluorescence, dominant-negative rescue\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with multiple orthogonal rescue experiments in Drosophila model\",\n      \"pmids\": [\"21729695\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"UVRAG promotes DNA double-strand-break repair by directly binding and activating DNA-PK in nonhomologous end joining (NHEJ); UVRAG also localizes to centrosomes and physically associates with CEP63, and disruption of this association causes centrosome instability and aneuploidy. These functions are independent of autophagy.\",\n      \"method\": \"Co-immunoprecipitation, in vitro DNA-PK kinase assay, immunofluorescence, genetic instability assays, irradiation sensitivity\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro kinase assay plus Co-IP plus localization, multiple functional readouts, single lab\",\n      \"pmids\": [\"22542840\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The Beclin1 coiled-coil domain forms a metastable antiparallel homodimer with imperfect a-d' pairings; Atg14L and UVRAG promote transition from this homodimer to stable Beclin1-Atg14L or Beclin1-UVRAG heterodimers. Beclin1 mutants with enhanced self-interaction show altered interactions with Atg14L or UVRAG.\",\n      \"method\": \"Crystal structure of Beclin1 coiled-coil domain, mutagenesis, co-immunoprecipitation, in vitro binding assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure plus mutagenesis plus Co-IP, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"22314358\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"UVRAG is a PtdIns(3)P-binding protein that depends on PtdIns(3)P for ER localization; UVRAG interacts with RINT-1 as an integral component of the ER tethering complex to couple phosphoinositide metabolism to COPI-vesicle tethering. During autophagy, UVRAG dissociates from the ER tether and cooperates with the Bif-1-Beclin1-PI(3)KC3 complex to mobilize Atg9 translocation for autophagosome formation.\",\n      \"method\": \"Co-immunoprecipitation, PtdIns(3)P binding assay, UVRAG knockdown, live-cell imaging, COPI vesicle trafficking assay\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — PtdIns(3)P binding assay plus Co-IP plus functional trafficking readouts, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"24056303\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"mTORC1 directly phosphorylates UVRAG under nutrient-enriched conditions; this phosphorylation promotes UVRAG association with RUBICON, enhancing RUBICON's antagonizing effect on autophagosome maturation. Upon nutrient deprivation and dephosphorylation, UVRAG is released from RUBICON to interact with the HOPS complex, enhancing autophagosome and endosome maturation and facilitating lysosomal EGFR degradation.\",\n      \"method\": \"In vitro mTORC1 kinase assay, phosphorylation site mapping, co-immunoprecipitation, autophagy flux assays, EGFR degradation assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay plus Co-IP plus multiple functional readouts, single lab\",\n      \"pmids\": [\"25533187\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Beclin1 deficiency causes complete loss of the UVRAG-VPS34 complex and associated lipid kinase activity; the UVRAG-Beclin1 interaction underlies Beclin1's function in endocytosis including Rab5-associated early endosome formation and endosome maturation. UVRAG overexpression rescues impaired p40phox-linked endosome formation caused by Beclin1 deficiency, while coiled-coil domain-truncated Beclin1 (UVRAG-binding mutant) does not.\",\n      \"method\": \"Conditional knockout mice, PI3K lipid kinase assay, immunofluorescence, fractionation, rescue with UVRAG mutants\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro kinase assay, genetic knockout, domain-specific rescue experiments, multiple orthogonal methods\",\n      \"pmids\": [\"25275521\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"UVRAG is required for the entry of influenza A virus and vesicular stomatitis virus by mediating viral endocytic transport and membrane penetration through interactions with the class C vacuolar protein sorting (C-Vps) tethering complex and endosomal glutamine-containing SNAREs (STX7, STX8, Vti1b), leading to assembly of a fusogenic VAMP8-containing trans-SNARE complex. UVRAG stimulates VAMP8 translocation to virus-bearing endosomes.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, viral entry assays, SNARE complex reconstitution, immunofluorescence\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional viral entry assay plus SNARE complex assembly, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"24550300\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In Drosophila wing development, the UVRAG-containing PI3K(III) complex (not the Atg14-containing complex) is specifically required for receptor downregulation through endolysosomal degradation (Notch, Wingless) and for epithelial cell polarity, while the Atg14-containing complex is involved in autophagosome formation.\",\n      \"method\": \"Drosophila loss-of-function genetics, UVRAG/Atg14/Atg6 knockdown, immunofluorescence, epistasis\",\n      \"journal\": \"BioMed research international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with multiple pathway readouts in Drosophila model\",\n      \"pmids\": [\"25006588\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"mTOR directly phosphorylates UVRAG at S550 and S571, activating VPS34 lipid kinase activity; disruption of these phosphorylation sites reduces VPS34 lipid kinase activity and impairs autolysosomal tubulation (autophagosome-lysosome reformation), leading to increased lysosomal tubules and massive cell death under nutrient stress.\",\n      \"method\": \"In vitro mTOR kinase assay, phosphorylation site mutagenesis, VPS34 lipid kinase assay, live-cell imaging of lysosomal tubulation\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay plus mutagenesis plus VPS34 lipid kinase assay plus imaging, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"26139536\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Cancer-derived UVRAG frameshift (FS) mutation produces a truncated UVRAG protein that acts in a dominant-negative manner to abrogate normal UVRAG functions in autophagy, centrosome stability, and DNA repair; UVRAGFS promotes CRC metastasis through Rac1 activation and EMT independently of autophagy, and confers chemosensitivity due to DNA repair defects.\",\n      \"method\": \"Expression of UVRAGFS in CRC cells, dominant-negative functional assays, Rac1 activity assays, DNA repair assays, in vivo xenograft\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal functional assays with dominant-negative mutant, in vivo xenograft, single lab\",\n      \"pmids\": [\"26234763\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"UVRAG localizes to UV-induced photolesions and associates with DDB1 to promote assembly and activity of the CRL4(DDB2) ubiquitin ligase complex (DDB2-DDB1-Cul4A-Roc1), leading to efficient XPC recruitment and global genomic nucleotide excision repair (NER). UVRAG depletion decreases substrate handover to XPC and confers UV-damage hypersensitivity.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence localization to photolesions, NER activity assays, siRNA knockdown, Drosophila genetic model\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP plus functional NER assay plus Drosophila model for cross-species validation, multiple orthogonal methods\",\n      \"pmids\": [\"27203177\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Crystal structure of the Beclin1-UVRAG coiled-coil complex reveals a strengthened interface with both hydrophobic pairings and electrostatic complementary interactions, explaining why Beclin1-UVRAG interaction is more potent than the Beclin1 homodimer. UVRAG coiled-coil mutants with weakened Beclin1 binding fail to outcompete Atg14L and cannot promote endolysosomal EGFR degradation.\",\n      \"method\": \"Crystal structure determination, site-directed mutagenesis, competitive binding assay, EGFR degradation assay, stapled peptide design\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure plus mutagenesis plus functional assay, multiple orthogonal methods in one study\",\n      \"pmids\": [\"29866835\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"UVRAG interacts with RINT-1-containing ER tethering complex and, via PtdIns(3)P binding, is required for Golgi-ER retrograde transport; during autophagy induction, UVRAG dissociates from this ER tether. Separately, UVRAG interacts with BLOC-1 complex and this interaction is required for BLOC-1 stability and BLOC-1-mediated cargo sorting to melanosomes; UVRAG is a direct transcriptional target of MITF downstream of α-MSH signaling.\",\n      \"method\": \"Co-immunoprecipitation, UVRAG knockout cells/zebrafish, melanosome biogenesis assays, ChIP/luciferase reporter for MITF target\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus zebrafish in vivo model plus functional cargo sorting assay, single lab\",\n      \"pmids\": [\"30061422\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"UVRAG is ubiquitinated by SMURF1 E3 ligase at lysine residues K517 and K559 (via K29/K33-linked polyubiquitin chains), which decreases UVRAG association with RUBICON and promotes autophagosome maturation. The deubiquitinase ZRANB1 removes these chains to restore RUBICON binding and inhibit autophagy flux. CSNK1A1 phosphorylation of UVRAG at Ser522 disrupts SMURF1 binding via PPxY motif, blocking ubiquitination.\",\n      \"method\": \"In vitro ubiquitination assay, deubiquitinase assay, site-directed mutagenesis, co-immunoprecipitation, autophagy flux assays\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro ubiquitination and deubiquitinase assays plus mutagenesis plus Co-IP, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"30686098\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"GORASP2/GRASP55 interacts with BECN1 to facilitate assembly and membrane association of the PtdIns3K UVRAG complex, and physically links autophagosomes to lysosomes via LC3 and LAMP2 interactions to promote autophagosome-lysosome fusion.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, autophagy flux assays\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional autophagy assays, single lab\",\n      \"pmids\": [\"30894053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In vivo, UVRAG frameshift (UVRAGFS) truncation disrupts the UVRAG-autophagy complex and impairs starvation- and LPS-induced autophagy (but not basal autophagy); UVRAGFS mice show NLRP3-inflammasome hyperactivation, increased inflammatory response, and enhanced spontaneous tumorigenesis associated with β-catenin stabilization and centrosome amplification.\",\n      \"method\": \"Inducible knock-in mouse model, autophagy flux assays, NLRP3 inflammasome activity, inflammatory and tumor phenotyping\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — inducible mouse model with multiple pathway readouts, in vivo validation across multiple pathological contexts\",\n      \"pmids\": [\"31831743\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Slamf1 recruits a Beclin1/Vps34/UVRAG complex (but not Atg14L or Rubicon) to phagosomes in macrophages; both BD and CCD domains of Beclin1 are required for Slamf1 binding. This complex regulates membrane fusion and NOX2 oxidase activity during bacterial phagocytosis.\",\n      \"method\": \"Co-immunoprecipitation, Beclin1 domain deletion mutants, NOX2 activity assay in Beclin1+/- macrophages\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with domain mapping plus functional NOX2 assay, single lab\",\n      \"pmids\": [\"22493499\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"UVRAG downregulation impairs autophagy flux, leading to ectopic accumulation of p62; accumulated p62 recruits RIPK1 and induces its self-oligomerization, activating the RIPK1/RIPK3/MLKL cascade and neuronal necroptosis. UVRAG overexpression inhibits neuronal necroptosis in cell and AD mouse models.\",\n      \"method\": \"UVRAG knockdown/overexpression, AAV-mediated gene manipulation in mice, Western blot, autophagy flux assays, necroptosis signaling assays\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo rescue with UVRAG overexpression, multiple signaling readouts, single lab\",\n      \"pmids\": [\"34646380\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Miga, a mitochondrial outer-membrane ER-mitochondrial contact site protein, binds both Atg14 and Uvrag and recruits them to mitochondria; Miga-induced PI3K activity requires Uvrag, while Miga-mediated stabilization of Syx17 (a SNARE for autophagosome-lysosome fusion) requires Atg14. Miga-regulated ER-mitochondria contact sites are critical for PI3P formation.\",\n      \"method\": \"Co-immunoprecipitation, Miga mutant Drosophila, PI3P assay, immunofluorescence, autophagy flux assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus Drosophila genetic model plus PI3P assay, single lab\",\n      \"pmids\": [\"36323251\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Upon starvation, UVRAG localizes to ER-phagy sites (ERPHS) and interacts with ER-phagy cargo receptors FAM134B, ATL3, and RTN3L; UVRAG regulates oligomerization of these receptors and facilitates recruitment of Atg8 family proteins to promote efficient ER-phagy (reticulophagy) initiation and clearance of pathogenic proinsulin aggregates. This function is independent of UVRAG's role as a PI3KC3-II subunit.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, siRNA knockdown, ER-phagy flux assays, receptor oligomerization assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional ER-phagy assay plus independence from PI3KC3-II established by domain analysis, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"37902287\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"UVRAG is required for efficient filovirus (Ebola virus and other pathogenic filoviruses) entry; UVRAG depletion impairs delivery of EBOV virions to NPC1+ compartments. Deletion of the UVRAG domain required for HOPS complex interaction abolishes EBOV entry, demonstrating that UVRAG coordinates with the HOPS tethering complex for endolysosomal trafficking of virions to the filoviral receptor NPC1.\",\n      \"method\": \"Inducible CRISPR/Cas9 knockout, viral entry assays, immunofluorescence of virion trafficking, UVRAG domain deletion mutants\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR knockout plus domain deletion mutants plus functional viral entry and trafficking assays, multiple orthogonal methods\",\n      \"pmids\": [\"32493822\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"HCV differentially induces expression of Rubicon (early, inhibits autophagosome maturation) and UVRAG (delayed, stimulates maturation); UVRAG overexpression facilitates autophagosome maturation and suppresses HCV replication, while Rubicon promotes viral replication. The HCV NS4B protein is sufficient to induce Rubicon expression and autophagosome accumulation.\",\n      \"method\": \"siRNA knockdown and overexpression of UVRAG/Rubicon, HCV replication assays, autophagosome maturation assays, NS4B expression\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA plus overexpression with functional viral and autophagy readouts, single lab\",\n      \"pmids\": [\"25807108\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"In T cells, UVRAG deficiency causes defects in peripheral naive T-cell homeostasis (reduced homeostatic proliferation, impaired CD8+ T-cell responses to LCMV infection) through autophagy-independent mechanisms; UVRAG-deficient T-cells show normal mitochondrial clearance and activation-induced autophagy, suggesting an autophagy-independent role in T-cell homeostasis.\",\n      \"method\": \"T-cell-specific conditional knockout mice, LCMV infection model, autophagy flux assays, mitophagy assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO mice with multiple functional readouts, negative result for autophagy dependence strengthens specificity claim\",\n      \"pmids\": [\"25583492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"UVRAG is essential for autophagic flux and cardiac function in vivo; UVRAG-deficient mice develop age-related cardiomyopathy with impaired autophagic flux (autophagosome accumulation without progression), while basal autophagosome formation is preserved, indicating UVRAG's primary role is in autophagosome maturation.\",\n      \"method\": \"PiggyBac transposon gene disruption mouse model, autophagic flux assay with chloroquine, cardiac function assessment\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo mouse knockout with autophagy flux assay and cardiac functional readout, single lab\",\n      \"pmids\": [\"24081163\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Akt1 inhibits autophagy by downregulating UVRAG expression at the transcriptional level; this effect is kinase-activity independent. Dominant-negative Akt1 also reduces UVRAG, and re-introduction of UVRAG rescues autophagic activity in Akt1-overexpressing cells.\",\n      \"method\": \"Akt1 overexpression and siRNA in 293T and breast cancer cells, UVRAG mRNA quantification, LC3 flux assays, UV-induced autophagy rescue\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — transcriptional downregulation shown by expression analysis plus functional rescue, single lab\",\n      \"pmids\": [\"23200933\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"UVRAG (the mammalian ortholog of yeast Vps38) is a multifunctional tumor suppressor that serves as a subunit of the Beclin1-VPS34-VPS15 class III PI3K complex II, where it promotes autophagosome maturation by recruiting the HOPS complex/Rab7 for lysosomal fusion, regulates endolysosomal trafficking, mediates Golgi-ER retrograde transport via the RINT-1 tether, initiates ER-phagy by interacting with cargo receptors, facilitates viral entry through SNARE complex assembly, promotes nucleotide excision repair via CRL4(DDB2) E3 ligase activation, repairs DNA double-strand breaks by activating DNA-PK in NHEJ, maintains centrosome stability through CEP63 interaction, and drives melanogenesis via BLOC-1; its activity is regulated by mTORC1 phosphorylation (promoting RUBICON association to inhibit maturation), SMURF1 ubiquitination (promoting autophagosome maturation by releasing RUBICON), and CSNK1A1 phosphorylation (blocking SMURF1-mediated ubiquitination).\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"UVRAG is the mammalian ortholog of yeast Vps38 and a defining subunit of a distinct class III PI3K complex (Vps34-VPS15-Beclin1-UVRAG, with Bif-1/Endophilin B1), where it positively activates VPS34 lipid kinase activity and acts as a tumor suppressor [#0, #1, #2]. UVRAG outcompetes Atg14L for the Beclin1 coiled-coil to form a strengthened, more stable heterodimer, partitioning these mutually exclusive complexes toward separate functions [#8, #17]. The UVRAG complex governs the maturation arm of the pathway: localizing to Rab9/Rab7-positive late endosomes, it recruits the HOPS/class C Vps tethering complex to drive autophagosome and endosome fusion with lysosomes and lysosomal degradation of cargoes such as EGFR [#3, #10, #17], and it also mediates Rab5-associated early endosome formation and growth-factor receptor downregulation [#4, #11, #13]. This maturation activity is tightly regulated: mTORC1 phosphorylates UVRAG (at S550/S571) to promote RUBICON association and inhibit maturation under nutrient-rich conditions while also sustaining VPS34 activity for autolysosome reformation [#10, #14], SMURF1 ubiquitinates UVRAG (K517/K559) to release it from RUBICON and accelerate maturation—an event reversed by the deubiquitinase ZRANB1 and blocked by CSNK1A1 phosphorylation [#19]. As a PtdIns(3)P-binding protein, UVRAG additionally engages the RINT-1 ER tethering complex to support Golgi-ER retrograde COPI-vesicle transport, dissociating from this tether upon autophagy induction to mobilize Atg9 [#9, #18], and independently of its PI3KC3-II role it initiates ER-phagy by binding and organizing the cargo receptors FAM134B, ATL3 and RTN3L [#25]. Beyond membrane trafficking, UVRAG carries autophagy-independent genome-maintenance functions: it activates DNA-PK in nonhomologous end joining, associates with CEP63 to preserve centrosome stability, and binds DDB1 to assemble the CRL4(DDB2) ligase for nucleotide excision repair [#7, #16]. It further mediates SNARE-dependent viral entry [#12, #26] and BLOC-1-dependent melanogenesis [#18]. Cancer-derived frameshift truncation acts dominant-negatively to abrogate autophagy, centrosome stability and DNA repair, driving Rac1-mediated metastasis, NLRP3 inflammasome hyperactivation and tumorigenesis [#15, #21].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Established UVRAG as a functional component of the autophagy machinery rather than merely a UV-resistance gene, by showing it activates the Beclin1-associated lipid kinase and suppresses tumor growth.\",\n      \"evidence\": \"Co-IP, knockdown, and in vitro PI3K lipid kinase assay in colon cancer cells\",\n      \"pmids\": [\"16799551\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve how UVRAG enters the complex relative to other regulators\", \"Mechanism of tumor suppression beyond autophagy not addressed\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identified Bif-1/Endophilin B1 as a UVRAG partner that bridges into the Beclin1-VPS34 complex, linking membrane curvature/SH3-BAR domains to PI3KC3 activation and autophagosome formation.\",\n      \"evidence\": \"Co-IP with domain mapping, siRNA, fluorescence microscopy\",\n      \"pmids\": [\"17891140\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define stoichiometry of UVRAG-Bif-1-Beclin1 assembly\", \"Membrane source of curvature not identified\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defined UVRAG as the Vps38 ortholog forming a complex mutually exclusive from Atg14, explaining functional division of labor by distinct subcellular localization (late endosomes vs phagophore).\",\n      \"evidence\": \"Homology analysis, Co-IP, immunofluorescence, siRNA in HeLa\",\n      \"pmids\": [\"18843052\", \"18612260\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"HOPS/Rab7 recruitment mechanism was single-lab Co-IP at this stage\", \"Switch between complexes not mechanistically defined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstrated UVRAG functions outside autophagy in genome maintenance, directly activating DNA-PK for NHEJ and stabilizing centrosomes via CEP63.\",\n      \"evidence\": \"Co-IP, in vitro DNA-PK kinase assay, immunofluorescence, genetic instability and irradiation assays\",\n      \"pmids\": [\"22542840\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Single lab\", \"Structural basis of DNA-PK activation not resolved\", \"Relationship between repair and trafficking pools of UVRAG unclear\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Resolved the structural basis for complex assembly, showing Atg14L and UVRAG convert a metastable Beclin1 homodimer into stable heterodimers.\",\n      \"evidence\": \"Crystal structure of Beclin1 coiled-coil, mutagenesis, Co-IP\",\n      \"pmids\": [\"22314358\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not capture full UVRAG-bound complex\", \"Cellular triggers of heterodimer switching not defined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showed UVRAG is a PtdIns(3)P-binding protein that couples phosphoinositide metabolism to membrane tethering, working through RINT-1 at the ER and switching to autophagosome biogenesis upon induction.\",\n      \"evidence\": \"PtdIns(3)P binding assay, Co-IP, COPI vesicle and live-cell trafficking assays\",\n      \"pmids\": [\"24056303\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signal driving ER-tether dissociation not identified\", \"How Atg9 mobilization is mechanistically linked unclear\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined nutrient-responsive regulation: mTORC1 phosphorylation of UVRAG toggles between RUBICON-bound (maturation off) and HOPS-bound (maturation on) states and sustains VPS34 activity for lysosome reformation.\",\n      \"evidence\": \"In vitro mTOR(C1) kinase assays, phosphosite mapping (S550/S571), Co-IP, autophagy flux and EGFR degradation, lysosomal tubulation imaging\",\n      \"pmids\": [\"25533187\", \"26139536\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phosphatase responsible for dephosphorylation not identified\", \"Quantitative occupancy of RUBICON vs HOPS states not measured\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Genetically separated UVRAG-complex functions, establishing Beclin1-UVRAG as the endocytic/maturation arm required for receptor degradation and endosome formation in vivo and across species.\",\n      \"evidence\": \"Conditional knockout mice with lipid kinase and rescue assays; Drosophila loss-of-function epistasis\",\n      \"pmids\": [\"25275521\", \"25006588\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific requirements not fully mapped\", \"Distinction of early- vs late-endosome roles incomplete\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Revealed a trafficking-dependent role in pathogen entry, with UVRAG coordinating C-Vps tethering and SNARE assembly to deliver virions through the endolysosomal system.\",\n      \"evidence\": \"Co-IP, siRNA, viral entry assays, SNARE complex reconstitution\",\n      \"pmids\": [\"24550300\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generalizability across virus families addressed only later\", \"Direct vs indirect SNARE engagement not fully resolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Extended UVRAG genome-maintenance roles to nucleotide excision repair, showing it promotes CRL4(DDB2) ligase assembly and XPC handover at photolesions.\",\n      \"evidence\": \"Co-IP, localization to photolesions, NER activity assays, siRNA, Drosophila model\",\n      \"pmids\": [\"27203177\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How UVRAG is recruited to DNA damage sites unclear\", \"Relationship to its lipid-kinase complex not addressed\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Provided atomic-resolution rationale for why UVRAG outcompetes Atg14L for Beclin1, linking interface strength to endolysosomal EGFR degradation.\",\n      \"evidence\": \"Crystal structure of Beclin1-UVRAG coiled-coil, mutagenesis, competitive binding and EGFR degradation assays, stapled peptides\",\n      \"pmids\": [\"29866835\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo competition dynamics not quantified\", \"Regulation of competition by post-translational modifications not integrated\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Broadened UVRAG trafficking roles to Golgi-ER retrograde transport and to BLOC-1-dependent melanogenesis, placing UVRAG transcriptionally downstream of MITF/\\u03b1-MSH signaling.\",\n      \"evidence\": \"Co-IP, knockout cells/zebrafish, melanosome biogenesis assays, ChIP/luciferase\",\n      \"pmids\": [\"30061422\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Mechanism of BLOC-1 stabilization by UVRAG not defined\", \"Whether melanogenic and trafficking pools overlap unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined ubiquitin- and phospho-regulatory control of the UVRAG-RUBICON switch, identifying SMURF1, ZRANB1, and CSNK1A1 as opposing regulators of autophagosome maturation.\",\n      \"evidence\": \"In vitro ubiquitination/deubiquitination assays, site mutagenesis (K517/K559, S522), Co-IP, autophagy flux\",\n      \"pmids\": [\"30686098\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Integration with mTORC1 phosphorylation not fully reconciled\", \"Signals controlling SMURF1/ZRANB1 balance unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Validated UVRAG functions in vivo and tied loss-of-function to inflammasome hyperactivation and tumorigenesis, showing GRASP55 facilitates UVRAG-complex assembly and fusion.\",\n      \"evidence\": \"Inducible knock-in mouse model (UVRAGFS) with autophagy, NLRP3, and tumor phenotyping; Co-IP and flux assays for GORASP2\",\n      \"pmids\": [\"31831743\", \"30894053\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Causal chain from autophagy defect to \\u03b2-catenin/centrosome phenotypes incomplete\", \"GRASP55 role replicated only in single lab\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified a PI3KC3-II-independent role for UVRAG in ER-phagy initiation, organizing cargo-receptor oligomerization and Atg8 recruitment to clear pathogenic protein aggregates.\",\n      \"evidence\": \"Co-IP, immunofluorescence, siRNA, ER-phagy flux and receptor oligomerization assays\",\n      \"pmids\": [\"37902287\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of receptor oligomerization control unknown\", \"How UVRAG is targeted to ERPHS not defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How UVRAG's distinct functional pools (PI3KC3-II maturation, DNA repair, ER-phagy, centrosome stability, viral entry) are physically and temporally partitioned within a cell remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model for how a single protein is allocated across mutually independent functions\", \"Stoichiometry and interconversion of complexes in vivo not measured\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [9, 18]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [3, 12, 25]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 7, 16]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [2, 3, 11]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [9, 18, 25]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [7]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [16]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [0, 3, 10, 25]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [3, 9, 12]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [7, 16]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [10, 19]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [15, 21]}\n    ],\n    \"complexes\": [\n      \"Beclin1-VPS34-VPS15-UVRAG PI3KC3 complex II\",\n      \"HOPS/class C Vps tethering complex\",\n      \"RINT-1 ER tethering complex\",\n      \"CRL4(DDB2) ubiquitin ligase complex\"\n    ],\n    \"partners\": [\n      \"BECN1\",\n      \"Bif-1/SH3GLB1\",\n      \"RUBICON\",\n      \"SMURF1\",\n      \"CEP63\",\n      \"DDB1\",\n      \"RINT1\",\n      \"FAM134B\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}