{"gene":"RB1CC1","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":2000,"finding":"FIP200 (RB1CC1) was identified as a novel inhibitor of Pyk2 kinase by yeast two-hybrid screen and confirmed by coimmunoprecipitation; FIP200 binds to the kinase domain of Pyk2 and inhibits its kinase activity in vitro kinase assays and in vivo, and dissociation of the endogenous FIP200-Pyk2 complex correlates with Pyk2 activation by biological stimuli.","method":"Yeast two-hybrid, in vitro binding, coimmunoprecipitation, in vitro kinase assay","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay with domain mapping, confirmed by reciprocal co-IP and in vivo activation assays, single lab but multiple orthogonal methods","pmids":["10769033"],"is_preprint":false},{"year":2002,"finding":"FIP200 (RB1CC1) associates with FAK through multiple domains and inhibits FAK kinase activity in vitro; FIP200 binds the kinase domain of FAK, inhibits FAK autophosphorylation in vivo, and overexpression inhibits cell spreading, migration, and cell cycle progression in a FAK-dependent manner. Disruption of endogenous FIP200-FAK interaction increases FAK phosphorylation.","method":"In vitro binding, coimmunoprecipitation, in vitro kinase assay, cell biological assays, domain mapping","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase reconstitution, domain mutagenesis, multiple orthogonal assays, single lab","pmids":["12221124"],"is_preprint":false},{"year":2002,"finding":"RB1CC1 is localized in the nucleus and its C-terminus is required for nuclear localization. Nuclear RB1CC1 directly binds a GC-rich region 201 bp upstream of the RB1 promoter and activates RB1 transcription.","method":"Western blot, immunocytochemistry, chromatin immunoprecipitation, luciferase reporter, EMSA","journal":"Oncogene / International journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and EMSA showing direct promoter binding, luciferase reporter, replicated across two papers from same group","pmids":["11850849","19437535"],"is_preprint":false},{"year":2005,"finding":"FIP200 interacts with TSC1 (not TSC2) to form a complex with TSC1-TSC2, and this interaction regulates cell size and S6 kinase phosphorylation. FIP200 overexpression reduces TSC1-TSC2 complex formation; knockdown of FIP200 reduces S6K phosphorylation and cell size in a TSC1-dependent manner.","method":"Coimmunoprecipitation, RNAi knockdown, cell size measurement, Western blot","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP, genetic epistasis via siRNA, multiple cellular assays, single lab","pmids":["16043512"],"is_preprint":false},{"year":2005,"finding":"FIP200 (RB1CC1) stabilizes p53 protein by increasing its half-life, reducing proteasomal degradation via a ubiquitin- and Hdm2-independent mechanism. The N-terminal 154 residues of FIP200 are sufficient for p53 interaction. FIP200 also decreases cyclin D1 protein half-life by promoting proteasome-dependent degradation, leading to G1 arrest in breast cancer cells.","method":"Coimmunoprecipitation, pulse-chase/half-life assay, flow cytometry, luciferase reporter, domain mapping","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal biochemical assays, domain deletion mapping, single lab","pmids":["16061648"],"is_preprint":false},{"year":2006,"finding":"FIP200 knockout in mice leads to reduced S6 kinase activation and cell size via increased TSC1-TSC2 complex function, and increased apoptosis through impaired JNK phosphorylation in response to TNFα. FIP200 interacts with ASK1 and TRAF2, regulates TRAF2-ASK1 interaction, and affects ASK1 phosphorylation.","method":"Mouse knockout, coimmunoprecipitation, kinase assays, Western blot","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo KO mouse model with defined phenotypes, biochemical pathway dissection, co-IP of endogenous complexes, multiple orthogonal methods","pmids":["17015619"],"is_preprint":false},{"year":2006,"finding":"RB1CC1 promotes TSC1 degradation through the ubiquitin-proteasomal pathway to maintain mTOR/S6K activity and cell size, particularly in neuromuscular cells.","method":"RNAi knockdown, Western blot, cell size measurement, proteasome inhibitor experiments","journal":"International journal of molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — single lab, cellular assays with proteasome inhibitor but no direct ubiquitination reconstitution","pmids":["16865226"],"is_preprint":false},{"year":2008,"finding":"FIP200 was identified as a ULK1/2-interacting protein required for autophagosome formation. FIP200 localizes to the autophagic isolation membrane under starvation. FIP200-deficient cells exhibit abolished autophagy induction and impaired ULK1 stability and phosphorylation.","method":"Coimmunoprecipitation, immunofluorescence, conditional KO mouse embryo fibroblasts, Western blot","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP with endogenous proteins, conditional KO with multiple autophagy readouts, localization by live imaging, replicated by multiple groups","pmids":["18443221"],"is_preprint":false},{"year":2008,"finding":"FIP200 interacts with PIASy via the RING finger of PIASy and the C-terminus of FIP200. PIASy redistributes FIP200 from cytoplasm to nucleus, abolishing FIP200 regulation of TSC/S6K signaling. FIP200 and PIASy are co-recruited to the p21 promoter and cooperate to enhance p21 transcriptional activation.","method":"Coimmunoprecipitation, immunofluorescence, subcellular fractionation, ChIP, luciferase reporter, siRNA","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP of endogenous proteins, co-IP, multiple orthogonal methods, single lab","pmids":["18285457"],"is_preprint":false},{"year":2009,"finding":"FIP200 forms a stable ~3 MDa complex with ULK1 and Atg13 in mammalian cells. In contrast to yeast, this complex formation is not altered by nutrient conditions. mTORC1 is incorporated into the ULK1-Atg13-FIP200 complex through ULK1 in a nutrient-dependent manner and phosphorylates ULK1 and Atg13. Starvation or rapamycin causes ULK1 dephosphorylation.","method":"Coimmunoprecipitation, gel filtration, mass spectrometry, Western blot","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — endogenous complex purification, nutrient-regulated mTORC1 incorporation shown biochemically, replicated independently by multiple labs","pmids":["19211835"],"is_preprint":false},{"year":2009,"finding":"FIP200 and ATG13 are required for correct localization of ULK1 to the pre-autophagosome and for ULK1 protein stability. In a de novo in vitro reconstituted reaction, FIP200 and ATG13 individually enhance ULK1 kinase activity but both are required for maximal stimulation.","method":"In vitro kinase reconstitution, coimmunoprecipitation, immunofluorescence, KO/knockdown","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution of kinase activation with purified proteins, replicated across labs","pmids":["19258318"],"is_preprint":false},{"year":2009,"finding":"FIP200 is essential for autophagy induction; neural-specific deletion of FIP200 in mice leads to cerebellar degeneration with accumulation of ubiquitinated protein aggregates, increased p62/SQSTM1, reduced autophagosome formation, accumulation of damaged mitochondria, and increased apoptosis with reduced JNK activation.","method":"Conditional KO mouse, electron microscopy, immunohistochemistry, Western blot, in vitro neuron culture","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic deletion with multiple autophagy readouts and defined neuropathological phenotype","pmids":["19940130"],"is_preprint":false},{"year":2011,"finding":"Cytoplasmic p53 inhibits autophagy through a direct molecular interaction with RB1CC1/FIP200. A single point mutation in p53 (K382R) abolishes both its autophagy-inhibiting capacity and its ability to co-immunoprecipitate with RB1CC1/FIP200.","method":"Coimmunoprecipitation, point mutagenesis, autophagy functional assays in p53-deficient cells","journal":"Cell cycle","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP with mutagenesis establishing the interaction determinant, functional rescue, single lab","pmids":["21775823"],"is_preprint":false},{"year":2011,"finding":"RB1CC1 (nuclear) forms a complex with hSNF5 and/or p53 and activates transcription of RB1, p16, and p21 by direct binding to the RB1 promoter, suppressing tumor cell growth.","method":"Coimmunoprecipitation, ChIP, luciferase reporter, RT-PCR, flow cytometry","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP with endogenous proteins, luciferase assay, co-IP of complex, single lab","pmids":["20614030"],"is_preprint":false},{"year":2011,"finding":"RB1CC1/FIP200 positively regulates TGF-β signaling by acting as a substrate-selective cofactor of Arkadia E3 ubiquitin ligase. RB1CC1 enhances Arkadia-mediated ubiquitination and degradation of c-Ski (but not SnoN) through direct physical interaction with c-Ski as a scaffold.","method":"Coimmunoprecipitation, ubiquitination assay, knockdown/overexpression with target gene expression readouts","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical ubiquitination assay, co-IP of endogenous proteins, functional knockdown, single lab","pmids":["21795712"],"is_preprint":false},{"year":2012,"finding":"FIP200 directly interacts with ATG16L1 via a short FIP200-binding domain (FBD) in ATG16L1. This interaction connects the ULK1 complex to the ATG5 complex. The FBD is not required for ATG16L1 dimerization or ATG5 binding but is required for amino acid starvation-induced (ULK1-dependent) autophagy, while glucose deprivation-induced (ULK1-independent) autophagy is retained in FBD-deleted ATG16L1.","method":"Coimmunoprecipitation, domain deletion mutagenesis, autophagy flux assays","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct interaction demonstrated with domain mapping, genetic epistasis distinguishing ULK1-dependent vs independent autophagy, multiple orthogonal methods","pmids":["23262492"],"is_preprint":false},{"year":2013,"finding":"FIP200 directly interacts with Atg16L1 in a phosphatidylinositol 3-kinase- and Atg14-independent manner. Atg16L1 deletion mutants lacking the FIP200-interacting domain are defective in proper membrane targeting to the isolation membrane, indicating FIP200 regulates both early and late events of autophagosome formation.","method":"Coimmunoprecipitation, domain deletion mutagenesis, immunofluorescence localization of Atg16L1 mutants","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct interaction, domain deletion with functional consequence on membrane targeting, replicated finding of FIP200-ATG16L1 interaction","pmids":["23392225"],"is_preprint":false},{"year":2016,"finding":"Residues 582-585 (LQFL) in FIP200 are required for interaction with Atg13. Mutation of these residues to AAAA (FIP200-4A) abolishes canonical autophagy in vitro and in vivo (knock-in mouse). The FIP200-4A knock-in mouse demonstrates that nonautophagic FIP200 functions (including protection from TNFα-induced apoptosis) are sufficient for embryogenesis, but autophagy-dependent FIP200 function is required for neonatal survival and tumor growth.","method":"Point mutagenesis, conditional KO and knock-in mouse models, autophagy flux assays, co-IP","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — structure-function mutagenesis with in vivo knock-in validation, genetic separation of autophagy-dependent from -independent functions, rigorous multi-method approach","pmids":["27013233"],"is_preprint":false},{"year":2019,"finding":"The C-terminal region (CTR) of FIP200 contains a dimeric globular domain called the 'Claw', which directly interacts with disordered residues 326-380 of p62/SQSTM1. The interaction is mediated by a positively charged pocket in the Claw, is enhanced by p62 phosphorylation, is mutually exclusive with p62-LC3B binding, promotes degradation of ubiquitinated cargo, and slows phase separation of ubiquitinated proteins by p62 in reconstituted systems.","method":"Crystal structure determination, in vitro binding/pulldown, reconstituted phase separation assay, mutagenesis, functional cargo degradation assay","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with functional validation, in vitro reconstitution, mutagenesis, multiple orthogonal methods in single rigorous study","pmids":["30853400"],"is_preprint":false},{"year":2020,"finding":"The N-terminal 640 residues (NTD) of FIP200 interact with the C-terminal IDR of ATG13. FIP200 is a dimer, while single copies of ULK1, ATG13, and ATG101 are present in the complex. In the presence of ATG13, the FIP200 NTD adopts a C-shaped conformation ~20 nm across. The FIP200 coiled coil projects away from the crescent-shaped NTD dimer and mediates membrane and NDP52 binding.","method":"HDX-MS, negative stain EM, cryo-EM, multiangle light scattering, mutagenesis","journal":"The Journal of cell biology / eLife","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure combined with HDX-MS interaction mapping and mutagenesis, two complementary papers","pmids":["32516362","32773036"],"is_preprint":false},{"year":2020,"finding":"NDP52 allosterically stimulates membrane binding by the ULK1 complex by promoting a more dynamic conformation of the membrane-binding portion of the FIP200 coiled coil. Giant unilamellar vesicle reconstitution confirmed NDP52-triggered membrane recruitment of the ULK1 complex. The membrane and NDP52 binding sites map to unique regions of the FIP200 coiled coil.","method":"HDX-MS, GUV reconstitution, electron microscopy","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution on GUVs, structural HDX-MS, mechanistically defines allosteric activation of ULK1 complex by NDP52 via FIP200","pmids":["32773036"],"is_preprint":false},{"year":2020,"finding":"In the absence of LC3 lipidation machinery (ATG7KO), FIP200 is still required for NBR1 flux. TAX1BP1 clusters FIP200 around NBR1 cargo and induces local autophagosome formation, replacing the requirement for lipidated LC3. TAX1BP1 recruitment to NBR1 puncta occurs via a ubiquitin-independent mode.","method":"Genome-wide CRISPR screens, KO cells, immunofluorescence, autophagy flux assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide CRISPR screen plus mechanistic follow-up in defined KO cells, multiple orthogonal methods","pmids":["33226137"],"is_preprint":false},{"year":2020,"finding":"CALCOCO2/NDP52 interacts with RB1CC1 to initiate de novo biogenesis of autophagic membranes on ubiquitin-coated damaged mitochondria, defining the CALCOCO2-RB1CC1 axis as one of two axes (the other being OPTN-ATG9A) for PINK1/PRKN-mediated mitophagy.","method":"Coimmunoprecipitation, mitophagy assays, KO cell lines","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP, functional mitophagy assays, genetic axis defined, single lab perspective/commentary format","pmids":["32892694"],"is_preprint":false},{"year":2021,"finding":"Crystal structures of the FIP200 Claw domain in complex with phosphorylated CCPG1 and Optineurin reveal that phosphorylation in their FIP200-binding regions enhances interactions with the FIP200 Claw. A consensus FIP200 Claw-binding motif was defined, present in multiple autophagy receptors within or near their LIR regions.","method":"Crystal structure determination, in vitro binding assays, phosphorylation site mutagenesis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structures with mutagenesis and functional validation, defines phosphoregulation of receptor-FIP200 interactions","pmids":["33692357"],"is_preprint":false},{"year":2021,"finding":"FIP200 controls the TBK1 activation threshold at SQSTM1/p62-positive condensates. In the absence of FIP200 or when FIP200 cannot bind TAX1BP1, TBK1 activation is strongly increased at p62 condensates, where TBK1 phosphorylates SQSTM1/p62 at Ser403.","method":"KO cells, Western blot, immunofluorescence, phosphorylation assays","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — FIP200 KO with specific phosphorylation readout, functional epistasis between FIP200 and TBK1 at p62 condensates, single lab","pmids":["34226595"],"is_preprint":false},{"year":2022,"finding":"CREBBP acetyltransferase acetylates RB1CC1 at multiple lysine residues, with K276 as the major site. K276 acetylation by CREBBP reduces ubiquitination of RB1CC1 at the same site to inhibit its ubiquitin-dependent proteasomal degradation. The N-terminal IDR of RB1CC1 can undergo liquid-liquid phase separation in vitro and drives RB1CC1 puncta formation in cells. Both K276 acetylation and the IDR are required for canonical autophagy function.","method":"Mass spectrometry, mutagenesis, in vitro LLPS assay, FRAP, co-IP, cycloheximide chase","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 1 / Moderate — identification of acetyltransferase writer (CREBBP), mutagenesis of modification site, in vitro LLPS reconstitution, multiple orthogonal methods, single lab","pmids":["36394358"],"is_preprint":false},{"year":2022,"finding":"Autophagy stimuli trigger Ca2+ transients on the outer surface of the ER membrane, controlled by EPG-4/EI24. These Ca2+ transients trigger liquid-liquid phase separation of FIP200, forming dynamic liquid-like FIP200 puncta that nucleate autophagosome initiation sites. Multiple FIP200 puncta on the ER assemble into autophagosome formation sites dependent on ER proteins VAPA/B and ATL2/3.","method":"Multi-modal SIM imaging, Ca2+ imaging, siRNA depletion, live cell imaging, phase separation analysis","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — live super-resolution imaging, genetic epistasis, multiple orthogonal methods establishing Ca2+-triggered FIP200 phase separation as the initiating event in metazoans","pmids":["36198318"],"is_preprint":false},{"year":2022,"finding":"Upon ferroptosis induction, RB1CC1 undergoes JNK-dependent phosphorylation at Ser537 and translocates to the nucleus, where it recruits ELP3 acetyltransferase to strengthen H4K12Ac histone modifications at enhancers linked to ferroptosis-associated genes including CHCHD3.","method":"Immunofluorescence, ChIP-seq, mutagenesis of phosphorylation site, cell-derived xenograft mouse model","journal":"Clinical and translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq, phospho-site mutagenesis, in vivo xenograft validation, single lab","pmids":["35220675"],"is_preprint":false},{"year":2024,"finding":"TAX1BP1 has two distinct binding sites for RB1CC1: the TAX1BP1 SKICH domain binds the RB1CC1 coiled coil, and the first coiled-coil domain of TAX1BP1 binds the extreme C-terminal coiled-coil and Claw region of RB1CC1. Crystal structure of the TAX1BP1 SKICH/RB1CC1 coiled-coil complex was determined. NAP1 and RB1CC1 compete for TAX1BP1 SKICH binding but the NAP1 FIR motif can stabilize a ternary TAX1BP1/NAP1/RB1CC1 complex.","method":"Crystal structure determination, in vitro binding/pulldown, competition assay, mutagenesis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with functional binding validation and competition assays, single rigorous study","pmids":["38437556"],"is_preprint":false},{"year":2016,"finding":"FIP200 deletion in neural stem/progenitor cells increases Ccl5 and Cxcl10 expression (via p62 aggregate-induced NF-κB activation, independent of p53), mediating increased microglia infiltration. Activated microglia (M1 phenotype) inhibit differentiation of FIP200-null NSCs non-cell-autonomously. Blocking microglia infiltration or activation rescues differentiation defects.","method":"Conditional KO mouse, NF-κB pathway analysis, microglia depletion/blocking experiments, flow cytometry","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo conditional KO with epistasis experiments (blocking microglia rescues phenotype), mechanistic pathway dissection","pmids":["28634261"],"is_preprint":false},{"year":2020,"finding":"FIP200 suppresses TBK1-IFN signaling independently of its autophagy function by interacting with the TBK1 adaptor protein AZI2. Complete ablation or disruption of non-canonical autophagy function of FIP200 activates the AZI2/TBK1/IRF signaling axis to promote T-cell recruitment in mammary tumors.","method":"Conditional KO mouse models, co-IP of FIP200-AZI2 interaction, gene expression analysis, immune cell profiling","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP demonstrating FIP200-AZI2 interaction, genetic mouse models separating autophagy-dependent from non-canonical FIP200 function, single lab","pmids":["32580962"],"is_preprint":false},{"year":2016,"finding":"PSCA interacts with RB1CC1 in the cytoplasm and binding of PSCA to RB1CC1 results in stabilization and nuclear translocation of RB1CC1, thereby activating cell cycle arrest and differentiation programs.","method":"Coimmunoprecipitation, immunofluorescence, nuclear/cytoplasmic fractionation","journal":"Carcinogenesis","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single co-IP and localization experiment, single lab, no reconstitution or mutagenesis","pmids":["26785734"],"is_preprint":false}],"current_model":"RB1CC1/FIP200 is a large scaffold protein that serves as an essential and multifunctional node in autophagy initiation and diverse signaling pathways: it forms the core ULK1-ATG13-FIP200-ATG101 complex (with FIP200 as a dimer adopting a C-shaped NTD that binds ATG13, and a coiled-coil domain that binds NDP52 and membranes), where mTORC1 phosphorylates ULK1 and ATG13 to suppress autophagy under nutrient-replete conditions; upon autophagy induction, FIP200 directly interacts with ATG16L1 to bridge the ULK1 and ATG5 complexes, and its C-terminal Claw domain directly binds multiple autophagy cargo receptors (p62/SQSTM1, CCPG1, Optineurin, TAX1BP1, NDP52/CALCOCO2) in a phosphorylation-regulated manner to couple cargo condensation to autophagosome biogenesis; Ca2+ transients on the ER surface trigger liquid-liquid phase separation of FIP200 to specify autophagosome initiation sites; independently of autophagy, nuclear RB1CC1 activates transcription of RB1, p16, and p21 in complex with hSNF5 and p53, inhibits FAK and Pyk2 kinase activity by binding their kinase domains, modulates TSC1-mTOR signaling, acts as a scaffold for Arkadia-mediated ubiquitination of TGF-β signaling inhibitors, and interacts with AZI2 to suppress TBK1-IFN signaling; CREBBP-mediated acetylation at K276 stabilizes RB1CC1 against ubiquitin-dependent degradation."},"narrative":{"mechanistic_narrative":"RB1CC1/FIP200 is a large dimeric scaffold protein that serves as the organizing node of autophagy initiation while also functioning in autophagy-independent signaling and transcription [PMID:18443221, PMID:19211835]. As a core subunit of the ULK1–ATG13–FIP200–ATG101 complex, it is required for autophagosome formation: it localizes to the isolation membrane, supports ULK1 stability and kinase activity, and—together with ATG13—maximally stimulates ULK1 in reconstituted reactions [PMID:18443221, PMID:19258318]. Within this complex, FIP200 is a dimer whose N-terminal domain adopts a C-shaped conformation that binds the C-terminal IDR of ATG13 via a critical LQFL motif (residues 582–585), while its coiled-coil region mediates membrane and NDP52 binding [PMID:27013233, PMID:32516362, PMID:32773036]; mTORC1 is incorporated through ULK1 and phosphorylates ULK1 and ATG13 to suppress autophagy under nutrient-replete conditions [PMID:19211835]. FIP200 bridges the ULK1 and ATG5/ATG16L1 machineries through a direct interaction with a short FIP200-binding domain in ATG16L1, governing both early and late stages of autophagosome biogenesis [PMID:23262492, PMID:23392225]. Selective autophagy is coordinated through the dimeric C-terminal Claw domain, which binds phosphorylation-enhanced motifs in cargo receptors p62/SQSTM1, CCPG1, and Optineurin, coupling cargo condensation and phase separation to autophagosome biogenesis [PMID:30853400, PMID:33692357]; FIP200 likewise engages NDP52/CALCOCO2 and TAX1BP1 to drive mitophagy and ubiquitin-independent cargo clearance and to set the TBK1 activation threshold at p62 condensates [PMID:33226137, PMID:32892694, PMID:34226595, PMID:38437556]. Autophagy site specification is initiated when ER-surface Ca2+ transients trigger liquid–liquid phase separation of FIP200 into puncta that nucleate autophagosome formation sites, an activity dependent on its N-terminal IDR and stabilized by CREBBP-mediated acetylation at K276 that protects FIP200 from ubiquitin-dependent degradation [PMID:36394358, PMID:36198318]. Independently of autophagy, FIP200 acts as a kinase inhibitor binding the kinase domains of Pyk2 and FAK [PMID:10769033, PMID:12221124], translocates to the nucleus to activate transcription of RB1, p16, and p21 in complex with hSNF5 and p53 [PMID:11850849, PMID:19437535, PMID:20614030], modulates TSC1–mTOR signaling and TNFα/JNK-dependent apoptosis [PMID:16043512, PMID:17015619], and serves as a substrate-selective cofactor for Arkadia-mediated ubiquitination in TGF-β signaling [PMID:21795712]. In vivo, FIP200 deletion produces autophagy-dependent neurodegeneration and apoptosis, and genetic separation-of-function knock-ins establish that its autophagic and non-autophagic activities serve distinct developmental requirements [PMID:19940130, PMID:27013233].","teleology":[{"year":2000,"claim":"Established the first molecular function of FIP200 as a kinase inhibitor, before any autophagy role was known, by showing it binds and suppresses Pyk2.","evidence":"Yeast two-hybrid, in vitro kinase assay, and reciprocal co-IP with domain mapping","pmids":["10769033"],"confidence":"High","gaps":["Physiological contexts where FIP200-Pyk2 dissociation is regulated not fully defined","Does not address structural basis of kinase-domain binding"]},{"year":2002,"claim":"Extended the kinase-inhibitor role to FAK and linked FIP200 to control of cell spreading, migration, and cell cycle, defining a cytoskeletal/adhesion signaling function.","evidence":"In vitro binding, kinase assay, domain mapping, and cell-biological assays","pmids":["12221124"],"confidence":"High","gaps":["Whether FAK and Pyk2 inhibition occur in the same cellular pool of FIP200 unknown","Relationship to nuclear/transcriptional functions not addressed"]},{"year":2002,"claim":"Identified a nuclear, sequence-specific transcriptional activity, showing FIP200 binds the RB1 promoter and activates its transcription—a function distinct from cytoplasmic signaling.","evidence":"ChIP, EMSA, luciferase reporter, and immunocytochemistry across two papers from one group","pmids":["11850849","19437535"],"confidence":"Medium","gaps":["Mechanism of regulated nuclear translocation not defined","Direct vs cofactor-mediated DNA binding not fully resolved"]},{"year":2005,"claim":"Connected FIP200 to mTOR/cell-size control and to p53 stabilization and cyclin D1 turnover, framing it as a growth and cell-cycle regulator.","evidence":"Co-IP, RNAi, half-life/pulse-chase assays, and cell size measurement","pmids":["16043512","16061648"],"confidence":"Medium","gaps":["Mechanism by which FIP200 stabilizes p53 (ubiquitin/Hdm2-independent) undefined","Direct vs indirect effect on TSC1-TSC2 complex unresolved"]},{"year":2006,"claim":"In vivo knockout established FIP200 as required for S6K activation, cell size, and protection from TNFα-induced apoptosis via TRAF2-ASK1-JNK signaling.","evidence":"Mouse knockout with co-IP, kinase assays, and pathway dissection","pmids":["17015619"],"confidence":"High","gaps":["Did not yet separate these phenotypes from FIP200's autophagy role","Direct biochemical link between FIP200 and TRAF2-ASK1 not structurally defined"]},{"year":2008,"claim":"Discovered FIP200's central role in autophagy by identifying it as a ULK1/2 interactor essential for autophagosome formation and ULK1 stability, redefining the protein's primary function.","evidence":"Co-IP, immunofluorescence localization to isolation membrane, and conditional KO MEFs","pmids":["18443221"],"confidence":"High","gaps":["Stoichiometry and architecture of the complex not yet known","Mechanism of ULK1 stabilization unresolved"]},{"year":2009,"claim":"Defined the architecture and nutrient regulation of the autophagy-initiation complex, showing FIP200-ULK1-ATG13 forms a stable ~3 MDa assembly into which mTORC1 is recruited to phosphorylate ULK1 and ATG13.","evidence":"Gel filtration, mass spectrometry, co-IP, and in vitro kinase reconstitution","pmids":["19211835","19258318"],"confidence":"High","gaps":["Precise contribution of FIP200 vs ATG13 to ULK1 activation not separated","Structural basis of complex assembly not yet determined"]},{"year":2009,"claim":"In vivo neural deletion demonstrated that FIP200-dependent autophagy clears ubiquitinated aggregates and damaged mitochondria, with loss causing neurodegeneration.","evidence":"Neural-specific conditional KO mouse with EM, IHC, and Western blot","pmids":["19940130"],"confidence":"High","gaps":["Did not separate autophagy-dependent from autophagy-independent contributions to neurodegeneration"]},{"year":2011,"claim":"Mapped autophagy-independent functions in transcription (RB1/p16/p21 activation with hSNF5/p53) and cytoplasmic p53-mediated autophagy inhibition, expanding the protein's regulatory repertoire.","evidence":"ChIP, luciferase, co-IP, and point mutagenesis (p53 K382R)","pmids":["20614030","21775823"],"confidence":"Medium","gaps":["Determinants distinguishing nuclear-transcriptional from cytoplasmic-autophagy pools of FIP200 unclear","Structural basis of p53-FIP200 interaction undefined"]},{"year":2011,"claim":"Identified FIP200 as a substrate-selective cofactor for Arkadia E3 ligase, positively regulating TGF-β signaling by promoting c-Ski ubiquitination.","evidence":"Co-IP, ubiquitination assay, and knockdown with target-gene readouts","pmids":["21795712"],"confidence":"Medium","gaps":["Structural basis of substrate selectivity (c-Ski vs SnoN) unresolved","Single-lab finding without reconstitution"]},{"year":2013,"claim":"Showed FIP200 bridges the ULK1 and ATG5 machineries via a direct interaction with a short FIP200-binding domain in ATG16L1, controlling membrane targeting in ULK1-dependent autophagy.","evidence":"Co-IP, domain deletion mutagenesis, and autophagy flux/localization assays across two papers","pmids":["23262492","23392225"],"confidence":"High","gaps":["Structural details of the FIP200-ATG16L1 interface not resolved","Whether bridging is direct contact or relayed through other factors"]},{"year":2016,"claim":"Genetically separated autophagy-dependent from -independent FIP200 functions in vivo, defining the ATG13-binding LQFL motif and showing non-autophagic functions support embryogenesis while autophagy supports neonatal survival and tumor growth.","evidence":"Point mutagenesis (FIP200-4A), conditional KO and knock-in mouse models, and autophagy flux assays","pmids":["27013233"],"confidence":"High","gaps":["Full molecular catalog of autophagy-independent functions still incomplete"]},{"year":2016,"claim":"Defined a non-cell-autonomous consequence of FIP200 loss, where p62 aggregate-driven NF-κB activation recruits microglia that block neural stem cell differentiation.","evidence":"Conditional KO mouse with NF-κB analysis and microglia blocking/depletion rescue","pmids":["28634261"],"confidence":"High","gaps":["Direct link from FIP200 to chemokine induction beyond p62 aggregation not detailed"]},{"year":2019,"claim":"Provided the structural mechanism for selective cargo recognition, showing the dimeric Claw domain binds disordered, phosphorylation-enhanced regions of p62 to couple cargo phase separation to degradation.","evidence":"Crystal structure, in vitro pulldown, reconstituted phase separation, and mutagenesis","pmids":["30853400"],"confidence":"High","gaps":["Generality of Claw motif across all receptors addressed only later","In vivo significance of mutually exclusive p62-LC3B binding not tested"]},{"year":2020,"claim":"Resolved the overall architecture of the ULK1 complex, establishing FIP200 as a dimer whose C-shaped NTD binds ATG13 and whose coiled coil binds membranes and NDP52, with NDP52 allosterically stimulating membrane recruitment.","evidence":"Cryo-EM, HDX-MS, MALS, GUV reconstitution, and mutagenesis across multiple papers","pmids":["32516362","32773036"],"confidence":"High","gaps":["Conformational changes upon full complex assembly on membranes not fully captured","How membrane binding integrates with kinase activation unresolved"]},{"year":2020,"claim":"Established FIP200 cargo-receptor axes for selective autophagy and mitophagy, showing TAX1BP1 and NDP52/CALCOCO2 recruit FIP200 to drive autophagosome formation, including LC3-lipidation-independent flux.","evidence":"Genome-wide CRISPR screens, KO cells, co-IP, and mitophagy/flux assays","pmids":["33226137","32892694"],"confidence":"High","gaps":["Mechanism of ubiquitin-independent TAX1BP1 recruitment to NBR1 incompletely defined","Relative contributions of parallel axes in vivo not quantified"]},{"year":2020,"claim":"Identified an autophagy-independent immunoregulatory function in which FIP200 suppresses TBK1-IFN signaling by binding the adaptor AZI2, modulating anti-tumor T-cell recruitment.","evidence":"Conditional KO mouse models, co-IP, gene expression, and immune profiling","pmids":["32580962"],"confidence":"Medium","gaps":["Structural basis of FIP200-AZI2 interaction undefined","Single-lab study"]},{"year":2021,"claim":"Generalized the phosphoregulated Claw-binding mechanism by defining a consensus motif in CCPG1 and Optineurin, and showed FIP200 sets the TBK1 activation threshold at p62 condensates via TAX1BP1.","evidence":"Crystal structures with phospho-site mutagenesis; KO cells with phosphorylation readouts","pmids":["33692357","34226595"],"confidence":"High","gaps":["How kinases generating the phospho-marks are coordinated with FIP200 recruitment not resolved","TBK1-threshold finding (Medium) from a single lab"]},{"year":2022,"claim":"Defined the initiating trigger for autophagosome site specification: ER-surface Ca2+ transients drive FIP200 liquid-liquid phase separation into puncta that nucleate formation sites, with CREBBP acetylation at K276 stabilizing FIP200 and its N-terminal IDR enabling LLPS.","evidence":"Super-resolution live imaging, Ca2+ imaging, siRNA epistasis; mass spectrometry, in vitro LLPS, FRAP, and CHX chase","pmids":["36198318","36394358"],"confidence":"High","gaps":["How Ca2+ is sensed by FIP200 to trigger phase separation mechanistically undefined","Interplay between acetylation, IDR, and Ca2+-triggered LLPS not fully integrated"]},{"year":2022,"claim":"Linked FIP200 to ferroptosis through a JNK-dependent phospho-switch (Ser537) driving nuclear translocation and ELP3-mediated histone acetylation at ferroptosis gene enhancers.","evidence":"ChIP-seq, phospho-site mutagenesis, immunofluorescence, and xenograft model","pmids":["35220675"],"confidence":"Medium","gaps":["Relationship between this nuclear function and prior RB1/p21 transcriptional activity unclear","Single-lab finding"]},{"year":2024,"claim":"Resolved the structural basis of TAX1BP1-FIP200 engagement, defining two distinct binding sites and competition with NAP1 that can form a stabilized ternary complex.","evidence":"Crystal structure, in vitro pulldown, competition assays, and mutagenesis","pmids":["38437556"],"confidence":"High","gaps":["Functional significance of the ternary TAX1BP1/NAP1/RB1CC1 complex in cells not established"]},{"year":null,"claim":"How the many autophagy-dependent and -independent functions of FIP200 are spatially and temporally partitioned within a single cell—and how its nuclear, transcriptional, kinase-inhibitory, and condensate-forming activities are switched—remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model of how post-translational marks select among FIP200 functions","Determinants of nuclear vs cytoplasmic partitioning incompletely mapped","Structural basis of most autophagy-independent interactions undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[7,15,18,19]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,10]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[2,13]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[2,13]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[19,20]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,7,9]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[2,8,13,27]},{"term_id":"GO:0005783","term_label":"endoplasmic 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Plays an indispensable role in fetal hematopoiesis and in the regulation of neuronal homeostasis (By similarity)","subcellular_location":"Nucleus; Cytoplasm; Cytoplasm, cytosol; Preautophagosomal structure; Lysosome","url":"https://www.uniprot.org/uniprotkb/Q8TDY2/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RB1CC1","classification":"Not 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ATG13","url":"https://www.omim.org/entry/615088"},{"mim_id":"614260","title":"CHROMOSOME 9 OPEN READING FRAME 72; C9ORF72","url":"https://www.omim.org/entry/614260"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Cytosol","reliability":"Supported"},{"location":"Nuclear membrane","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in 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\"method\": \"Yeast two-hybrid, in vitro binding, coimmunoprecipitation, in vitro kinase assay\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay with domain mapping, confirmed by reciprocal co-IP and in vivo activation assays, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"10769033\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"FIP200 (RB1CC1) associates with FAK through multiple domains and inhibits FAK kinase activity in vitro; FIP200 binds the kinase domain of FAK, inhibits FAK autophosphorylation in vivo, and overexpression inhibits cell spreading, migration, and cell cycle progression in a FAK-dependent manner. Disruption of endogenous FIP200-FAK interaction increases FAK phosphorylation.\",\n      \"method\": \"In vitro binding, coimmunoprecipitation, in vitro kinase assay, cell biological assays, domain mapping\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase reconstitution, domain mutagenesis, multiple orthogonal assays, single lab\",\n      \"pmids\": [\"12221124\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"RB1CC1 is localized in the nucleus and its C-terminus is required for nuclear localization. Nuclear RB1CC1 directly binds a GC-rich region 201 bp upstream of the RB1 promoter and activates RB1 transcription.\",\n      \"method\": \"Western blot, immunocytochemistry, chromatin immunoprecipitation, luciferase reporter, EMSA\",\n      \"journal\": \"Oncogene / International journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and EMSA showing direct promoter binding, luciferase reporter, replicated across two papers from same group\",\n      \"pmids\": [\"11850849\", \"19437535\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"FIP200 interacts with TSC1 (not TSC2) to form a complex with TSC1-TSC2, and this interaction regulates cell size and S6 kinase phosphorylation. FIP200 overexpression reduces TSC1-TSC2 complex formation; knockdown of FIP200 reduces S6K phosphorylation and cell size in a TSC1-dependent manner.\",\n      \"method\": \"Coimmunoprecipitation, RNAi knockdown, cell size measurement, Western blot\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP, genetic epistasis via siRNA, multiple cellular assays, single lab\",\n      \"pmids\": [\"16043512\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"FIP200 (RB1CC1) stabilizes p53 protein by increasing its half-life, reducing proteasomal degradation via a ubiquitin- and Hdm2-independent mechanism. The N-terminal 154 residues of FIP200 are sufficient for p53 interaction. FIP200 also decreases cyclin D1 protein half-life by promoting proteasome-dependent degradation, leading to G1 arrest in breast cancer cells.\",\n      \"method\": \"Coimmunoprecipitation, pulse-chase/half-life assay, flow cytometry, luciferase reporter, domain mapping\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal biochemical assays, domain deletion mapping, single lab\",\n      \"pmids\": [\"16061648\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"FIP200 knockout in mice leads to reduced S6 kinase activation and cell size via increased TSC1-TSC2 complex function, and increased apoptosis through impaired JNK phosphorylation in response to TNFα. FIP200 interacts with ASK1 and TRAF2, regulates TRAF2-ASK1 interaction, and affects ASK1 phosphorylation.\",\n      \"method\": \"Mouse knockout, coimmunoprecipitation, kinase assays, Western blot\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo KO mouse model with defined phenotypes, biochemical pathway dissection, co-IP of endogenous complexes, multiple orthogonal methods\",\n      \"pmids\": [\"17015619\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"RB1CC1 promotes TSC1 degradation through the ubiquitin-proteasomal pathway to maintain mTOR/S6K activity and cell size, particularly in neuromuscular cells.\",\n      \"method\": \"RNAi knockdown, Western blot, cell size measurement, proteasome inhibitor experiments\",\n      \"journal\": \"International journal of molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — single lab, cellular assays with proteasome inhibitor but no direct ubiquitination reconstitution\",\n      \"pmids\": [\"16865226\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"FIP200 was identified as a ULK1/2-interacting protein required for autophagosome formation. FIP200 localizes to the autophagic isolation membrane under starvation. FIP200-deficient cells exhibit abolished autophagy induction and impaired ULK1 stability and phosphorylation.\",\n      \"method\": \"Coimmunoprecipitation, immunofluorescence, conditional KO mouse embryo fibroblasts, Western blot\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP with endogenous proteins, conditional KO with multiple autophagy readouts, localization by live imaging, replicated by multiple groups\",\n      \"pmids\": [\"18443221\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"FIP200 interacts with PIASy via the RING finger of PIASy and the C-terminus of FIP200. PIASy redistributes FIP200 from cytoplasm to nucleus, abolishing FIP200 regulation of TSC/S6K signaling. FIP200 and PIASy are co-recruited to the p21 promoter and cooperate to enhance p21 transcriptional activation.\",\n      \"method\": \"Coimmunoprecipitation, immunofluorescence, subcellular fractionation, ChIP, luciferase reporter, siRNA\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP of endogenous proteins, co-IP, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"18285457\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"FIP200 forms a stable ~3 MDa complex with ULK1 and Atg13 in mammalian cells. In contrast to yeast, this complex formation is not altered by nutrient conditions. mTORC1 is incorporated into the ULK1-Atg13-FIP200 complex through ULK1 in a nutrient-dependent manner and phosphorylates ULK1 and Atg13. Starvation or rapamycin causes ULK1 dephosphorylation.\",\n      \"method\": \"Coimmunoprecipitation, gel filtration, mass spectrometry, Western blot\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — endogenous complex purification, nutrient-regulated mTORC1 incorporation shown biochemically, replicated independently by multiple labs\",\n      \"pmids\": [\"19211835\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"FIP200 and ATG13 are required for correct localization of ULK1 to the pre-autophagosome and for ULK1 protein stability. In a de novo in vitro reconstituted reaction, FIP200 and ATG13 individually enhance ULK1 kinase activity but both are required for maximal stimulation.\",\n      \"method\": \"In vitro kinase reconstitution, coimmunoprecipitation, immunofluorescence, KO/knockdown\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution of kinase activation with purified proteins, replicated across labs\",\n      \"pmids\": [\"19258318\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"FIP200 is essential for autophagy induction; neural-specific deletion of FIP200 in mice leads to cerebellar degeneration with accumulation of ubiquitinated protein aggregates, increased p62/SQSTM1, reduced autophagosome formation, accumulation of damaged mitochondria, and increased apoptosis with reduced JNK activation.\",\n      \"method\": \"Conditional KO mouse, electron microscopy, immunohistochemistry, Western blot, in vitro neuron culture\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic deletion with multiple autophagy readouts and defined neuropathological phenotype\",\n      \"pmids\": [\"19940130\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Cytoplasmic p53 inhibits autophagy through a direct molecular interaction with RB1CC1/FIP200. A single point mutation in p53 (K382R) abolishes both its autophagy-inhibiting capacity and its ability to co-immunoprecipitate with RB1CC1/FIP200.\",\n      \"method\": \"Coimmunoprecipitation, point mutagenesis, autophagy functional assays in p53-deficient cells\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP with mutagenesis establishing the interaction determinant, functional rescue, single lab\",\n      \"pmids\": [\"21775823\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"RB1CC1 (nuclear) forms a complex with hSNF5 and/or p53 and activates transcription of RB1, p16, and p21 by direct binding to the RB1 promoter, suppressing tumor cell growth.\",\n      \"method\": \"Coimmunoprecipitation, ChIP, luciferase reporter, RT-PCR, flow cytometry\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP with endogenous proteins, luciferase assay, co-IP of complex, single lab\",\n      \"pmids\": [\"20614030\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"RB1CC1/FIP200 positively regulates TGF-β signaling by acting as a substrate-selective cofactor of Arkadia E3 ubiquitin ligase. RB1CC1 enhances Arkadia-mediated ubiquitination and degradation of c-Ski (but not SnoN) through direct physical interaction with c-Ski as a scaffold.\",\n      \"method\": \"Coimmunoprecipitation, ubiquitination assay, knockdown/overexpression with target gene expression readouts\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical ubiquitination assay, co-IP of endogenous proteins, functional knockdown, single lab\",\n      \"pmids\": [\"21795712\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"FIP200 directly interacts with ATG16L1 via a short FIP200-binding domain (FBD) in ATG16L1. This interaction connects the ULK1 complex to the ATG5 complex. The FBD is not required for ATG16L1 dimerization or ATG5 binding but is required for amino acid starvation-induced (ULK1-dependent) autophagy, while glucose deprivation-induced (ULK1-independent) autophagy is retained in FBD-deleted ATG16L1.\",\n      \"method\": \"Coimmunoprecipitation, domain deletion mutagenesis, autophagy flux assays\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct interaction demonstrated with domain mapping, genetic epistasis distinguishing ULK1-dependent vs independent autophagy, multiple orthogonal methods\",\n      \"pmids\": [\"23262492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"FIP200 directly interacts with Atg16L1 in a phosphatidylinositol 3-kinase- and Atg14-independent manner. Atg16L1 deletion mutants lacking the FIP200-interacting domain are defective in proper membrane targeting to the isolation membrane, indicating FIP200 regulates both early and late events of autophagosome formation.\",\n      \"method\": \"Coimmunoprecipitation, domain deletion mutagenesis, immunofluorescence localization of Atg16L1 mutants\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct interaction, domain deletion with functional consequence on membrane targeting, replicated finding of FIP200-ATG16L1 interaction\",\n      \"pmids\": [\"23392225\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Residues 582-585 (LQFL) in FIP200 are required for interaction with Atg13. Mutation of these residues to AAAA (FIP200-4A) abolishes canonical autophagy in vitro and in vivo (knock-in mouse). The FIP200-4A knock-in mouse demonstrates that nonautophagic FIP200 functions (including protection from TNFα-induced apoptosis) are sufficient for embryogenesis, but autophagy-dependent FIP200 function is required for neonatal survival and tumor growth.\",\n      \"method\": \"Point mutagenesis, conditional KO and knock-in mouse models, autophagy flux assays, co-IP\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — structure-function mutagenesis with in vivo knock-in validation, genetic separation of autophagy-dependent from -independent functions, rigorous multi-method approach\",\n      \"pmids\": [\"27013233\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The C-terminal region (CTR) of FIP200 contains a dimeric globular domain called the 'Claw', which directly interacts with disordered residues 326-380 of p62/SQSTM1. The interaction is mediated by a positively charged pocket in the Claw, is enhanced by p62 phosphorylation, is mutually exclusive with p62-LC3B binding, promotes degradation of ubiquitinated cargo, and slows phase separation of ubiquitinated proteins by p62 in reconstituted systems.\",\n      \"method\": \"Crystal structure determination, in vitro binding/pulldown, reconstituted phase separation assay, mutagenesis, functional cargo degradation assay\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with functional validation, in vitro reconstitution, mutagenesis, multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"30853400\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The N-terminal 640 residues (NTD) of FIP200 interact with the C-terminal IDR of ATG13. FIP200 is a dimer, while single copies of ULK1, ATG13, and ATG101 are present in the complex. In the presence of ATG13, the FIP200 NTD adopts a C-shaped conformation ~20 nm across. The FIP200 coiled coil projects away from the crescent-shaped NTD dimer and mediates membrane and NDP52 binding.\",\n      \"method\": \"HDX-MS, negative stain EM, cryo-EM, multiangle light scattering, mutagenesis\",\n      \"journal\": \"The Journal of cell biology / eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure combined with HDX-MS interaction mapping and mutagenesis, two complementary papers\",\n      \"pmids\": [\"32516362\", \"32773036\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"NDP52 allosterically stimulates membrane binding by the ULK1 complex by promoting a more dynamic conformation of the membrane-binding portion of the FIP200 coiled coil. Giant unilamellar vesicle reconstitution confirmed NDP52-triggered membrane recruitment of the ULK1 complex. The membrane and NDP52 binding sites map to unique regions of the FIP200 coiled coil.\",\n      \"method\": \"HDX-MS, GUV reconstitution, electron microscopy\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution on GUVs, structural HDX-MS, mechanistically defines allosteric activation of ULK1 complex by NDP52 via FIP200\",\n      \"pmids\": [\"32773036\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"In the absence of LC3 lipidation machinery (ATG7KO), FIP200 is still required for NBR1 flux. TAX1BP1 clusters FIP200 around NBR1 cargo and induces local autophagosome formation, replacing the requirement for lipidated LC3. TAX1BP1 recruitment to NBR1 puncta occurs via a ubiquitin-independent mode.\",\n      \"method\": \"Genome-wide CRISPR screens, KO cells, immunofluorescence, autophagy flux assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide CRISPR screen plus mechanistic follow-up in defined KO cells, multiple orthogonal methods\",\n      \"pmids\": [\"33226137\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CALCOCO2/NDP52 interacts with RB1CC1 to initiate de novo biogenesis of autophagic membranes on ubiquitin-coated damaged mitochondria, defining the CALCOCO2-RB1CC1 axis as one of two axes (the other being OPTN-ATG9A) for PINK1/PRKN-mediated mitophagy.\",\n      \"method\": \"Coimmunoprecipitation, mitophagy assays, KO cell lines\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, functional mitophagy assays, genetic axis defined, single lab perspective/commentary format\",\n      \"pmids\": [\"32892694\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Crystal structures of the FIP200 Claw domain in complex with phosphorylated CCPG1 and Optineurin reveal that phosphorylation in their FIP200-binding regions enhances interactions with the FIP200 Claw. A consensus FIP200 Claw-binding motif was defined, present in multiple autophagy receptors within or near their LIR regions.\",\n      \"method\": \"Crystal structure determination, in vitro binding assays, phosphorylation site mutagenesis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structures with mutagenesis and functional validation, defines phosphoregulation of receptor-FIP200 interactions\",\n      \"pmids\": [\"33692357\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"FIP200 controls the TBK1 activation threshold at SQSTM1/p62-positive condensates. In the absence of FIP200 or when FIP200 cannot bind TAX1BP1, TBK1 activation is strongly increased at p62 condensates, where TBK1 phosphorylates SQSTM1/p62 at Ser403.\",\n      \"method\": \"KO cells, Western blot, immunofluorescence, phosphorylation assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — FIP200 KO with specific phosphorylation readout, functional epistasis between FIP200 and TBK1 at p62 condensates, single lab\",\n      \"pmids\": [\"34226595\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CREBBP acetyltransferase acetylates RB1CC1 at multiple lysine residues, with K276 as the major site. K276 acetylation by CREBBP reduces ubiquitination of RB1CC1 at the same site to inhibit its ubiquitin-dependent proteasomal degradation. The N-terminal IDR of RB1CC1 can undergo liquid-liquid phase separation in vitro and drives RB1CC1 puncta formation in cells. Both K276 acetylation and the IDR are required for canonical autophagy function.\",\n      \"method\": \"Mass spectrometry, mutagenesis, in vitro LLPS assay, FRAP, co-IP, cycloheximide chase\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — identification of acetyltransferase writer (CREBBP), mutagenesis of modification site, in vitro LLPS reconstitution, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"36394358\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Autophagy stimuli trigger Ca2+ transients on the outer surface of the ER membrane, controlled by EPG-4/EI24. These Ca2+ transients trigger liquid-liquid phase separation of FIP200, forming dynamic liquid-like FIP200 puncta that nucleate autophagosome initiation sites. Multiple FIP200 puncta on the ER assemble into autophagosome formation sites dependent on ER proteins VAPA/B and ATL2/3.\",\n      \"method\": \"Multi-modal SIM imaging, Ca2+ imaging, siRNA depletion, live cell imaging, phase separation analysis\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — live super-resolution imaging, genetic epistasis, multiple orthogonal methods establishing Ca2+-triggered FIP200 phase separation as the initiating event in metazoans\",\n      \"pmids\": [\"36198318\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Upon ferroptosis induction, RB1CC1 undergoes JNK-dependent phosphorylation at Ser537 and translocates to the nucleus, where it recruits ELP3 acetyltransferase to strengthen H4K12Ac histone modifications at enhancers linked to ferroptosis-associated genes including CHCHD3.\",\n      \"method\": \"Immunofluorescence, ChIP-seq, mutagenesis of phosphorylation site, cell-derived xenograft mouse model\",\n      \"journal\": \"Clinical and translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq, phospho-site mutagenesis, in vivo xenograft validation, single lab\",\n      \"pmids\": [\"35220675\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TAX1BP1 has two distinct binding sites for RB1CC1: the TAX1BP1 SKICH domain binds the RB1CC1 coiled coil, and the first coiled-coil domain of TAX1BP1 binds the extreme C-terminal coiled-coil and Claw region of RB1CC1. Crystal structure of the TAX1BP1 SKICH/RB1CC1 coiled-coil complex was determined. NAP1 and RB1CC1 compete for TAX1BP1 SKICH binding but the NAP1 FIR motif can stabilize a ternary TAX1BP1/NAP1/RB1CC1 complex.\",\n      \"method\": \"Crystal structure determination, in vitro binding/pulldown, competition assay, mutagenesis\",\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 with functional binding validation and competition assays, single rigorous study\",\n      \"pmids\": [\"38437556\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"FIP200 deletion in neural stem/progenitor cells increases Ccl5 and Cxcl10 expression (via p62 aggregate-induced NF-κB activation, independent of p53), mediating increased microglia infiltration. Activated microglia (M1 phenotype) inhibit differentiation of FIP200-null NSCs non-cell-autonomously. Blocking microglia infiltration or activation rescues differentiation defects.\",\n      \"method\": \"Conditional KO mouse, NF-κB pathway analysis, microglia depletion/blocking experiments, flow cytometry\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo conditional KO with epistasis experiments (blocking microglia rescues phenotype), mechanistic pathway dissection\",\n      \"pmids\": [\"28634261\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"FIP200 suppresses TBK1-IFN signaling independently of its autophagy function by interacting with the TBK1 adaptor protein AZI2. Complete ablation or disruption of non-canonical autophagy function of FIP200 activates the AZI2/TBK1/IRF signaling axis to promote T-cell recruitment in mammary tumors.\",\n      \"method\": \"Conditional KO mouse models, co-IP of FIP200-AZI2 interaction, gene expression analysis, immune cell profiling\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP demonstrating FIP200-AZI2 interaction, genetic mouse models separating autophagy-dependent from non-canonical FIP200 function, single lab\",\n      \"pmids\": [\"32580962\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PSCA interacts with RB1CC1 in the cytoplasm and binding of PSCA to RB1CC1 results in stabilization and nuclear translocation of RB1CC1, thereby activating cell cycle arrest and differentiation programs.\",\n      \"method\": \"Coimmunoprecipitation, immunofluorescence, nuclear/cytoplasmic fractionation\",\n      \"journal\": \"Carcinogenesis\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single co-IP and localization experiment, single lab, no reconstitution or mutagenesis\",\n      \"pmids\": [\"26785734\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RB1CC1/FIP200 is a large scaffold protein that serves as an essential and multifunctional node in autophagy initiation and diverse signaling pathways: it forms the core ULK1-ATG13-FIP200-ATG101 complex (with FIP200 as a dimer adopting a C-shaped NTD that binds ATG13, and a coiled-coil domain that binds NDP52 and membranes), where mTORC1 phosphorylates ULK1 and ATG13 to suppress autophagy under nutrient-replete conditions; upon autophagy induction, FIP200 directly interacts with ATG16L1 to bridge the ULK1 and ATG5 complexes, and its C-terminal Claw domain directly binds multiple autophagy cargo receptors (p62/SQSTM1, CCPG1, Optineurin, TAX1BP1, NDP52/CALCOCO2) in a phosphorylation-regulated manner to couple cargo condensation to autophagosome biogenesis; Ca2+ transients on the ER surface trigger liquid-liquid phase separation of FIP200 to specify autophagosome initiation sites; independently of autophagy, nuclear RB1CC1 activates transcription of RB1, p16, and p21 in complex with hSNF5 and p53, inhibits FAK and Pyk2 kinase activity by binding their kinase domains, modulates TSC1-mTOR signaling, acts as a scaffold for Arkadia-mediated ubiquitination of TGF-β signaling inhibitors, and interacts with AZI2 to suppress TBK1-IFN signaling; CREBBP-mediated acetylation at K276 stabilizes RB1CC1 against ubiquitin-dependent degradation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RB1CC1/FIP200 is a large dimeric scaffold protein that serves as the organizing node of autophagy initiation while also functioning in autophagy-independent signaling and transcription [#7, #9]. As a core subunit of the ULK1–ATG13–FIP200–ATG101 complex, it is required for autophagosome formation: it localizes to the isolation membrane, supports ULK1 stability and kinase activity, and—together with ATG13—maximally stimulates ULK1 in reconstituted reactions [#7, #10]. Within this complex, FIP200 is a dimer whose N-terminal domain adopts a C-shaped conformation that binds the C-terminal IDR of ATG13 via a critical LQFL motif (residues 582–585), while its coiled-coil region mediates membrane and NDP52 binding [#17, #19, #20]; mTORC1 is incorporated through ULK1 and phosphorylates ULK1 and ATG13 to suppress autophagy under nutrient-replete conditions [#9]. FIP200 bridges the ULK1 and ATG5/ATG16L1 machineries through a direct interaction with a short FIP200-binding domain in ATG16L1, governing both early and late stages of autophagosome biogenesis [#15, #16]. Selective autophagy is coordinated through the dimeric C-terminal Claw domain, which binds phosphorylation-enhanced motifs in cargo receptors p62/SQSTM1, CCPG1, and Optineurin, coupling cargo condensation and phase separation to autophagosome biogenesis [#18, #23]; FIP200 likewise engages NDP52/CALCOCO2 and TAX1BP1 to drive mitophagy and ubiquitin-independent cargo clearance and to set the TBK1 activation threshold at p62 condensates [#21, #22, #24, #28]. Autophagy site specification is initiated when ER-surface Ca2+ transients trigger liquid–liquid phase separation of FIP200 into puncta that nucleate autophagosome formation sites, an activity dependent on its N-terminal IDR and stabilized by CREBBP-mediated acetylation at K276 that protects FIP200 from ubiquitin-dependent degradation [#25, #26]. Independently of autophagy, FIP200 acts as a kinase inhibitor binding the kinase domains of Pyk2 and FAK [#0, #1], translocates to the nucleus to activate transcription of RB1, p16, and p21 in complex with hSNF5 and p53 [#2, #13], modulates TSC1–mTOR signaling and TNFα/JNK-dependent apoptosis [#3, #5], and serves as a substrate-selective cofactor for Arkadia-mediated ubiquitination in TGF-β signaling [#14]. In vivo, FIP200 deletion produces autophagy-dependent neurodegeneration and apoptosis, and genetic separation-of-function knock-ins establish that its autophagic and non-autophagic activities serve distinct developmental requirements [#11, #17].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established the first molecular function of FIP200 as a kinase inhibitor, before any autophagy role was known, by showing it binds and suppresses Pyk2.\",\n      \"evidence\": \"Yeast two-hybrid, in vitro kinase assay, and reciprocal co-IP with domain mapping\",\n      \"pmids\": [\"10769033\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological contexts where FIP200-Pyk2 dissociation is regulated not fully defined\", \"Does not address structural basis of kinase-domain binding\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Extended the kinase-inhibitor role to FAK and linked FIP200 to control of cell spreading, migration, and cell cycle, defining a cytoskeletal/adhesion signaling function.\",\n      \"evidence\": \"In vitro binding, kinase assay, domain mapping, and cell-biological assays\",\n      \"pmids\": [\"12221124\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether FAK and Pyk2 inhibition occur in the same cellular pool of FIP200 unknown\", \"Relationship to nuclear/transcriptional functions not addressed\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identified a nuclear, sequence-specific transcriptional activity, showing FIP200 binds the RB1 promoter and activates its transcription—a function distinct from cytoplasmic signaling.\",\n      \"evidence\": \"ChIP, EMSA, luciferase reporter, and immunocytochemistry across two papers from one group\",\n      \"pmids\": [\"11850849\", \"19437535\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of regulated nuclear translocation not defined\", \"Direct vs cofactor-mediated DNA binding not fully resolved\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Connected FIP200 to mTOR/cell-size control and to p53 stabilization and cyclin D1 turnover, framing it as a growth and cell-cycle regulator.\",\n      \"evidence\": \"Co-IP, RNAi, half-life/pulse-chase assays, and cell size measurement\",\n      \"pmids\": [\"16043512\", \"16061648\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which FIP200 stabilizes p53 (ubiquitin/Hdm2-independent) undefined\", \"Direct vs indirect effect on TSC1-TSC2 complex unresolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"In vivo knockout established FIP200 as required for S6K activation, cell size, and protection from TNFα-induced apoptosis via TRAF2-ASK1-JNK signaling.\",\n      \"evidence\": \"Mouse knockout with co-IP, kinase assays, and pathway dissection\",\n      \"pmids\": [\"17015619\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not yet separate these phenotypes from FIP200's autophagy role\", \"Direct biochemical link between FIP200 and TRAF2-ASK1 not structurally defined\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Discovered FIP200's central role in autophagy by identifying it as a ULK1/2 interactor essential for autophagosome formation and ULK1 stability, redefining the protein's primary function.\",\n      \"evidence\": \"Co-IP, immunofluorescence localization to isolation membrane, and conditional KO MEFs\",\n      \"pmids\": [\"18443221\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and architecture of the complex not yet known\", \"Mechanism of ULK1 stabilization unresolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined the architecture and nutrient regulation of the autophagy-initiation complex, showing FIP200-ULK1-ATG13 forms a stable ~3 MDa assembly into which mTORC1 is recruited to phosphorylate ULK1 and ATG13.\",\n      \"evidence\": \"Gel filtration, mass spectrometry, co-IP, and in vitro kinase reconstitution\",\n      \"pmids\": [\"19211835\", \"19258318\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise contribution of FIP200 vs ATG13 to ULK1 activation not separated\", \"Structural basis of complex assembly not yet determined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"In vivo neural deletion demonstrated that FIP200-dependent autophagy clears ubiquitinated aggregates and damaged mitochondria, with loss causing neurodegeneration.\",\n      \"evidence\": \"Neural-specific conditional KO mouse with EM, IHC, and Western blot\",\n      \"pmids\": [\"19940130\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not separate autophagy-dependent from autophagy-independent contributions to neurodegeneration\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Mapped autophagy-independent functions in transcription (RB1/p16/p21 activation with hSNF5/p53) and cytoplasmic p53-mediated autophagy inhibition, expanding the protein's regulatory repertoire.\",\n      \"evidence\": \"ChIP, luciferase, co-IP, and point mutagenesis (p53 K382R)\",\n      \"pmids\": [\"20614030\", \"21775823\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Determinants distinguishing nuclear-transcriptional from cytoplasmic-autophagy pools of FIP200 unclear\", \"Structural basis of p53-FIP200 interaction undefined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identified FIP200 as a substrate-selective cofactor for Arkadia E3 ligase, positively regulating TGF-β signaling by promoting c-Ski ubiquitination.\",\n      \"evidence\": \"Co-IP, ubiquitination assay, and knockdown with target-gene readouts\",\n      \"pmids\": [\"21795712\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of substrate selectivity (c-Ski vs SnoN) unresolved\", \"Single-lab finding without reconstitution\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showed FIP200 bridges the ULK1 and ATG5 machineries via a direct interaction with a short FIP200-binding domain in ATG16L1, controlling membrane targeting in ULK1-dependent autophagy.\",\n      \"evidence\": \"Co-IP, domain deletion mutagenesis, and autophagy flux/localization assays across two papers\",\n      \"pmids\": [\"23262492\", \"23392225\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural details of the FIP200-ATG16L1 interface not resolved\", \"Whether bridging is direct contact or relayed through other factors\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Genetically separated autophagy-dependent from -independent FIP200 functions in vivo, defining the ATG13-binding LQFL motif and showing non-autophagic functions support embryogenesis while autophagy supports neonatal survival and tumor growth.\",\n      \"evidence\": \"Point mutagenesis (FIP200-4A), conditional KO and knock-in mouse models, and autophagy flux assays\",\n      \"pmids\": [\"27013233\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full molecular catalog of autophagy-independent functions still incomplete\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined a non-cell-autonomous consequence of FIP200 loss, where p62 aggregate-driven NF-κB activation recruits microglia that block neural stem cell differentiation.\",\n      \"evidence\": \"Conditional KO mouse with NF-κB analysis and microglia blocking/depletion rescue\",\n      \"pmids\": [\"28634261\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct link from FIP200 to chemokine induction beyond p62 aggregation not detailed\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Provided the structural mechanism for selective cargo recognition, showing the dimeric Claw domain binds disordered, phosphorylation-enhanced regions of p62 to couple cargo phase separation to degradation.\",\n      \"evidence\": \"Crystal structure, in vitro pulldown, reconstituted phase separation, and mutagenesis\",\n      \"pmids\": [\"30853400\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generality of Claw motif across all receptors addressed only later\", \"In vivo significance of mutually exclusive p62-LC3B binding not tested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Resolved the overall architecture of the ULK1 complex, establishing FIP200 as a dimer whose C-shaped NTD binds ATG13 and whose coiled coil binds membranes and NDP52, with NDP52 allosterically stimulating membrane recruitment.\",\n      \"evidence\": \"Cryo-EM, HDX-MS, MALS, GUV reconstitution, and mutagenesis across multiple papers\",\n      \"pmids\": [\"32516362\", \"32773036\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Conformational changes upon full complex assembly on membranes not fully captured\", \"How membrane binding integrates with kinase activation unresolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Established FIP200 cargo-receptor axes for selective autophagy and mitophagy, showing TAX1BP1 and NDP52/CALCOCO2 recruit FIP200 to drive autophagosome formation, including LC3-lipidation-independent flux.\",\n      \"evidence\": \"Genome-wide CRISPR screens, KO cells, co-IP, and mitophagy/flux assays\",\n      \"pmids\": [\"33226137\", \"32892694\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of ubiquitin-independent TAX1BP1 recruitment to NBR1 incompletely defined\", \"Relative contributions of parallel axes in vivo not quantified\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified an autophagy-independent immunoregulatory function in which FIP200 suppresses TBK1-IFN signaling by binding the adaptor AZI2, modulating anti-tumor T-cell recruitment.\",\n      \"evidence\": \"Conditional KO mouse models, co-IP, gene expression, and immune profiling\",\n      \"pmids\": [\"32580962\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of FIP200-AZI2 interaction undefined\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Generalized the phosphoregulated Claw-binding mechanism by defining a consensus motif in CCPG1 and Optineurin, and showed FIP200 sets the TBK1 activation threshold at p62 condensates via TAX1BP1.\",\n      \"evidence\": \"Crystal structures with phospho-site mutagenesis; KO cells with phosphorylation readouts\",\n      \"pmids\": [\"33692357\", \"34226595\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How kinases generating the phospho-marks are coordinated with FIP200 recruitment not resolved\", \"TBK1-threshold finding (Medium) from a single lab\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined the initiating trigger for autophagosome site specification: ER-surface Ca2+ transients drive FIP200 liquid-liquid phase separation into puncta that nucleate formation sites, with CREBBP acetylation at K276 stabilizing FIP200 and its N-terminal IDR enabling LLPS.\",\n      \"evidence\": \"Super-resolution live imaging, Ca2+ imaging, siRNA epistasis; mass spectrometry, in vitro LLPS, FRAP, and CHX chase\",\n      \"pmids\": [\"36198318\", \"36394358\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Ca2+ is sensed by FIP200 to trigger phase separation mechanistically undefined\", \"Interplay between acetylation, IDR, and Ca2+-triggered LLPS not fully integrated\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Linked FIP200 to ferroptosis through a JNK-dependent phospho-switch (Ser537) driving nuclear translocation and ELP3-mediated histone acetylation at ferroptosis gene enhancers.\",\n      \"evidence\": \"ChIP-seq, phospho-site mutagenesis, immunofluorescence, and xenograft model\",\n      \"pmids\": [\"35220675\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relationship between this nuclear function and prior RB1/p21 transcriptional activity unclear\", \"Single-lab finding\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Resolved the structural basis of TAX1BP1-FIP200 engagement, defining two distinct binding sites and competition with NAP1 that can form a stabilized ternary complex.\",\n      \"evidence\": \"Crystal structure, in vitro pulldown, competition assays, and mutagenesis\",\n      \"pmids\": [\"38437556\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional significance of the ternary TAX1BP1/NAP1/RB1CC1 complex in cells not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the many autophagy-dependent and -independent functions of FIP200 are spatially and temporally partitioned within a single cell—and how its nuclear, transcriptional, kinase-inhibitory, and condensate-forming activities are switched—remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model of how post-translational marks select among FIP200 functions\", \"Determinants of nuclear vs cytoplasmic partitioning incompletely mapped\", \"Structural basis of most autophagy-independent interactions undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [7, 15, 18, 19]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 10]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [2, 13]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [2, 13]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [19, 20]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 7, 9]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [2, 8, 13, 27]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [26]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [7, 9, 11, 15, 18, 26]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 3, 14, 30]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [2, 13]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [5, 17]}\n    ],\n    \"complexes\": [\n      \"ULK1-ATG13-FIP200-ATG101 complex\"\n    ],\n    \"partners\": [\n      \"ULK1\",\n      \"ATG13\",\n      \"ATG16L1\",\n      \"SQSTM1\",\n      \"CALCOCO2\",\n      \"TAX1BP1\",\n      \"OPTN\",\n      \"TSC1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}