{"gene":"AMBRA1","run_date":"2026-04-28T17:12:37","timeline":{"discoveries":[{"year":2007,"finding":"AMBRA1 was identified as a positive regulator of BECLIN1-dependent autophagy; it contains a WD40 domain and its loss in mouse embryos impairs autophagy, causes accumulation of ubiquitinated proteins, and leads to severe neural tube defects with unbalanced cell proliferation and excessive apoptosis.","method":"RNA interference in vitro, overexpression assays, and mouse knockout/hypomorphic model with phenotypic readout","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — foundational study with multiple orthogonal methods (RNAi, OE, in vivo KO), highly cited and replicated","pmids":["17589504"],"is_preprint":false},{"year":2010,"finding":"AMBRA1 tethers the BECLIN1-VPS34 core complex to the dynein motor through direct interaction with dynein light chains 1/2 (DLC1/2); upon autophagy induction, ULK1 phosphorylates AMBRA1, releasing the complex from dynein and allowing its relocalization to the ER where autophagosome nucleation occurs.","method":"Co-immunoprecipitation, live-cell imaging, ULK1 kinase assay, dominant-negative DLC1 experiments, AMBRA1 DLC1-binding site mutagenesis","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1-2 — reciprocal Co-IP, mutagenesis of binding sites, kinase assay, direct localization with functional consequence; independently replicated","pmids":["20921139"],"is_preprint":false},{"year":2011,"finding":"AMBRA1 binds preferentially to the mitochondrial pool of BCL-2; upon autophagy induction this interaction is disrupted, releasing AMBRA1 to promote BECLIN1 activity; AMBRA1 can compete with both mitochondrial and ER-resident BCL-2 for BECLIN1 binding.","method":"Co-immunoprecipitation, subcellular fractionation, overexpression and knockdown assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP with fractionation showing organelle-specific interaction, functional competition assay","pmids":["21358617"],"is_preprint":false},{"year":2011,"finding":"Parkin interacts with AMBRA1 and this interaction increases strongly during prolonged mitochondrial depolarization; AMBRA1 is recruited in a Parkin-dependent manner to perinuclear clusters of depolarized mitochondria and activates PI3K (class III) locally to promote mitophagy; AMBRA1 is not required for Parkin translocation but is critical for subsequent mitochondrial clearance.","method":"Tandem affinity purification/mass spectrometry, reciprocal co-immunoprecipitation from HEK293, SH-SY5Y, and mouse brain; AMBRA1 siRNA knockdown with mitophagy readout","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — MS-identified interactor validated by reciprocal Co-IP in multiple cell types including brain; KD with defined mitophagy phenotype","pmids":["21753002"],"is_preprint":false},{"year":2012,"finding":"During apoptosis, AMBRA1 is cleaved by caspases at D482 and further degraded by calpains; a caspase non-cleavable AMBRA1 mutant prolongs autophagy and counteracts cell death; AMBRA1 downregulation sensitizes cells to apoptotic stimuli.","method":"In vitro cleavage assays, caspase/calpain inhibitor experiments, caspase non-cleavable mutant, siRNA knockdown with apoptosis readout","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro cleavage assay combined with mutagenesis and functional readout","pmids":["22441670"],"is_preprint":false},{"year":2013,"finding":"Under non-autophagic conditions, mTOR inhibits AMBRA1 by phosphorylation; upon autophagy induction AMBRA1 is dephosphorylated and then interacts with the E3 ligase TRAF6 to promote K63-linked ubiquitylation and stabilization of ULK1, forming a positive feedback loop with ULK1-mediated AMBRA1 phosphorylation.","method":"Co-immunoprecipitation, ubiquitylation assays (K63 linkage-specific), phosphorylation assays, mTOR inhibition/activation experiments, ULK1 kinase assays","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal biochemical methods demonstrating the regulatory loop; highly cited","pmids":["23524951"],"is_preprint":false},{"year":2014,"finding":"Cullin-4 (CRL4) binds AMBRA1 under basal conditions to limit its abundance via degradation; ULK1-dependent phosphorylation upon autophagy induction causes Cullin-4 to release AMBRA1; the re-established Cullin-4/AMBRA1 interaction terminates autophagy by degrading AMBRA1. Upon Cullin-4 dissociation, AMBRA1 binds and inhibits Cullin-5, stabilizing the mTOR inhibitor DEPTOR to create a positive feedback loop for autophagy onset.","method":"Co-immunoprecipitation, ubiquitylation assays, siRNA knockdown, autophagy flux assays","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods; mechanistic dissection of dynamic CRL interactions with functional consequence","pmids":["25499913"],"is_preprint":false},{"year":2014,"finding":"AMBRA1 promotes c-Myc dephosphorylation and degradation by directly facilitating the interaction between c-Myc and the phosphatase PP2A; when mTOR is inhibited, AMBRA1 enhances PP2A activity toward c-Myc, reducing cell division rate; loss of AMBRA1 increases tumorigenesis, identifying AMBRA1 as a haploinsufficient tumor suppressor.","method":"Co-immunoprecipitation, PP2A phosphatase assay, c-Myc stability assays, AMBRA1 KO/KD with proliferation and tumor growth readouts","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including biochemical phosphatase assay and in vivo tumor models; replicated by multiple groups","pmids":["25438055"],"is_preprint":false},{"year":2014,"finding":"RNF2 associates with AMBRA1 and acts as an E3 ligase to ubiquitinate AMBRA1 via K48-linked chains at lysine 45, promoting its proteasomal degradation; WASH recruits RNF2 to AMBRA1 to mediate this degradation and thereby downregulate autophagy.","method":"Co-immunoprecipitation, in vitro ubiquitination assay, ubiquitin linkage determination, RNF2 knockdown/overexpression with autophagy flux readout","journal":"Cell research","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro ubiquitination assay with site mapping (K45) and functional autophagy readout","pmids":["24980959"],"is_preprint":false},{"year":2016,"finding":"The C-terminal part of AMBRA1, generated by caspase cleavage during apoptosis, contains a BH3-like domain that directly binds and inhibits the antiapoptotic factor BCL2, creating a proapoptotic positive feedback loop.","method":"Co-immunoprecipitation, caspase cleavage assays, BH3 domain mutagenesis, apoptosis assays","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 1-2 — biochemical demonstration of BH3-domain-dependent BCL2 binding with functional apoptosis consequence","pmids":["27123694"],"is_preprint":false},{"year":2017,"finding":"AMBRA1 regulates the spatial activity of Src kinase; it binds both FAK and Src in cancer cells and controls targeting of active phospho-Src away from focal adhesions into autophagic structures. When FAK is present, AMBRA1 is recruited to focal adhesions promoting direction-sensing invasion; trafficking partners Dynactin 1 and IFITM3 were identified as AMBRA1 binding partners by interaction proteomics.","method":"Co-immunoprecipitation, interaction proteomics, live-cell imaging of phospho-Src localization, invasion assays, FAK/AMBRA1 mutant analysis","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 — proteomics-identified interactors validated by Co-IP; functional localization experiments with direct phenotypic consequence","pmids":["28362576"],"is_preprint":false},{"year":2018,"finding":"The E3 ubiquitin ligase HUWE1 is required for AMBRA1-mediated mitophagy independently of PINK1/PARKIN; IKKα phosphorylates AMBRA1 at serine 1014, promoting structural changes in AMBRA1 that increase its interaction with LC3/GABARAP proteins and mitophagic activity.","method":"Co-immunoprecipitation, in vitro kinase assay, phosphomimetic/phosphodeficient mutants, HUWE1 and IKKα knockdown/KO with mitophagy readout (mitochondrial markers, LC3 co-localization)","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — kinase assay, phosphosite mutagenesis, multiple orthogonal methods; novel regulatory pathway established","pmids":["30217973"],"is_preprint":false},{"year":2018,"finding":"AMBRA1 promotes Treg differentiation by interacting with the phosphatase PP2A to stabilize the transcriptional activator FOXO3, which in turn triggers FOXP3 transcription; this pathway was validated in mouse models of tumor growth and multiple sclerosis.","method":"Co-immunoprecipitation, PP2A activity assay, FOXO3/FOXP3 reporter assays, AMBRA1 KD with Treg differentiation readout in vivo","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 — biochemical phosphatase interaction assay, transcriptional readout, in vivo validation","pmids":["30513302"],"is_preprint":false},{"year":2018,"finding":"HUWE1-mediated regulation of MCL1 stability controls AMBRA1-mediated mitophagy: MCL1 overexpression inhibits HUWE1 recruitment to mitochondria; GSK-3β phosphorylates MCL1 at S159 during AMBRA1-mediated mitophagy, triggering HUWE1-dependent MCL1 degradation and enabling mitophagy.","method":"Co-immunoprecipitation, mitophagy flux assay, GSK-3β inhibition, phosphomimetic MCL1 mutants, HUWE1 and MCL1 overexpression/knockdown","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal biochemical methods with defined phosphosite and functional mitophagy readout","pmids":["31434979"],"is_preprint":false},{"year":2019,"finding":"The E3 ubiquitin ligase TRIM32 activates ULK1 kinase activity in muscle cells through unanchored K63-linked polyubiquitin chains; AMBRA1 acts as a scaffold that conveys TRIM32 to ULK1; muscular dystrophy 2H mutations in TRIM32 disrupt its ability to bind ULK1 and induce autophagy.","method":"Co-immunoprecipitation, in vitro ULK1 kinase assay, ubiquitin chain type determination, TRIM32 disease mutant analysis, autophagy flux assay in muscle cells","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro kinase assay combined with disease mutant validation and functional autophagy readout","pmids":["31234693"],"is_preprint":false},{"year":2020,"finding":"AMBRA1 interacts with ERLIN1 at MAM (mitochondria-associated membrane) raft-like microdomains; this interaction is essential for autophagosome formation upon nutrient starvation and depends on ganglioside GD3 and MFN2 integrity.","method":"Co-immunoprecipitation, FRET analysis, subcellular fractionation to MAMs, siRNA knockdown of ERLIN1/ST8SIA1/MFN2 with autophagy flux readout","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 2 — FRET validation of interaction at specific membrane domain, functional genetic dissection with multiple KDs","pmids":["33034545"],"is_preprint":false},{"year":2021,"finding":"AMBRA1 functions as the substrate receptor for the CRL4 (cullin 4) E3 ubiquitin ligase complex (CRL4AMBRA1/CRL4DCAF3) that targets all three D-type cyclins (cyclin D1, D2, D3) for ubiquitylation and proteasomal degradation; cancer hotspot mutations in D-type cyclins abrogate their binding to AMBRA1 and stabilize them.","method":"Biochemical ubiquitylation assays, genetic KO in somatic cells and mice, genome-wide CRISPR screen, Co-immunoprecipitation, CDK4/6 inhibitor treatment, in vivo mouse models","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1-2 — reconstituted ubiquitylation, confirmed by three independent groups simultaneously, CRISPR screen, in vivo validation; Strong evidence","pmids":["33854235","33854239","33854232"],"is_preprint":false},{"year":2021,"finding":"AMBRA1 regulates G1-to-S transition and replication-phase entry by controlling D-type cyclin abundance through both proteasomal degradation and MYC/MYCN-mediated transcription; AMBRA1 loss causes replication stress and genomic instability; CHK1 kinase is a synthetic lethal target in AMBRA1-deficient tumors.","method":"Cell cycle analysis, cyclin D protein stability assays, DNA damage markers, AMBRA1 KO mouse models, CHK1 inhibitor sensitivity assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — genetic and biochemical approaches with multiple in vivo and in vitro readouts; simultaneous publication with two other Nature papers","pmids":["33854232"],"is_preprint":false},{"year":2021,"finding":"AMBRA1 is recruited to the outer mitochondrial membrane (OMM) upon mitochondrial depolarization where it interacts with PINK1 and ATAD3A; AMBRA1 promotes PINK1 stability by counteracting ATAD3A-mediated import and LONP1-dependent degradation of PINK1, thereby facilitating PINK1-PARKIN mitophagy.","method":"Co-immunoprecipitation at OMM fractions, AMBRA1/ATAD3A siRNA knockdown, PINK1 stability assays, mitophagy flux (phospho-ubiquitin, PARKIN recruitment)","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP at specific subcellular compartment, epistasis (ATAD3A KD rescues AMBRA1 KD phenotype), multiple orthogonal methods","pmids":["34798798"],"is_preprint":false},{"year":2021,"finding":"AMBRA1 acts as a substrate receptor for the CRL4 complex to mediate nonproteolytic K63-linked polyubiquitylation of Smad4, enhancing its transcriptional activity and TGFβ signaling, thereby promoting TGFβ-induced EMT, migration, and invasion of breast cancer cells.","method":"Co-immunoprecipitation, in vitro ubiquitination assay (K63 linkage determination), Smad4 transcriptional reporter assay, AMBRA1 KD with EMT/invasion readouts, mouse breast cancer metastasis model","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro ubiquitination with linkage specificity, functional TGFβ reporter, in vivo metastasis model","pmids":["34362797"],"is_preprint":false},{"year":2021,"finding":"HPV E7 protein interacts with AMBRA1, competes with its binding to BECLIN1, and triggers calpain-dependent AMBRA1 degradation, thereby reducing autophagy activity in HPV-positive oropharyngeal squamous cell carcinoma cells.","method":"Co-immunoprecipitation, calpain inhibitor experiments, AMBRA1 and BECLIN1 binding competition assays, autophagy flux assays in HPV+ vs HPV- cells","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP competition assay with calpain pharmacological validation and functional autophagy readout","pmids":["33172332"],"is_preprint":false},{"year":2021,"finding":"AMBRA1 suppresses SOCS3 to maintain STAT3 activation in medulloblastoma; this c-MYC/AMBRA1/STAT3 axis regulates stem cell potential, growth, and migration of Group 3 medulloblastoma.","method":"AMBRA1 knockdown in MB stem cells, STAT3 reporter assays, SOCS3 rescue experiments, sphere-forming and invasion assays, autophagy inhibition","journal":"Acta neuropathologica","confidence":"Medium","confidence_rationale":"Tier 2 — genetic KD with pathway rescue, but single lab","pmids":["34302498"],"is_preprint":false},{"year":2022,"finding":"Muscle-specific AMBRA1 knockout in mice leads to impaired mitophagic flux, accumulation of TOMM20, swollen mitochondria, decreased DRP1 and Parkin recruitment to mitochondria, lysosomal accumulation, and reduced oxidative fiber proportion; AMBRA1 overexpression in wild-type muscle is sufficient to enhance mitochondrial clearance.","method":"Muscle-specific conditional KO (Ambra1fl/fl:Mlc1f-Cre), AMBRA1 overexpression in vivo, mitochondrial fractionation, electron microscopy, respiratory complex activity assay","journal":"Journal of cachexia, sarcopenia and muscle","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with tissue-specific phenotype, confirmed by OE experiments, multiple orthogonal readouts","pmids":["35593053"],"is_preprint":false},{"year":2023,"finding":"Cryo-EM structure of AMBRA1 in complex with DDB1 at 3.08 Å resolution reveals that AMBRA1's N-terminal helix-loop-helix motif and WD40 domain associate with the double-propeller fold of DDB1; DDB1-binding-defective AMBRA1 mutants prevent ubiquitination of cyclin D1 in vitro and increase cell cycle progression.","method":"Cryo-EM structure determination, hydrogen-deuterium exchange mass spectrometry (HDX-MS), DDB1-binding mutants, in vitro ubiquitination assay, cell cycle analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 — atomic resolution cryo-EM structure with mutagenesis validation and in vitro reconstitution of ubiquitination","pmids":["37993427"],"is_preprint":false},{"year":2023,"finding":"AMBRA1 is phosphorylated during mitosis on multiple sites by CDK1 and PLK1; this phosphorylation is required for proper mitotic spindle orientation through regulation of NUMA1 localization and dynamics.","method":"In vitro CDK1/PLK1 kinase assays, phosphomimetic/phosphodeficient AMBRA1 mutants, live-cell imaging of spindle orientation, NUMA1 localization analysis, AMBRA1 KD","journal":"Cellular and molecular life sciences","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro kinase assay with mutagenesis, functional spindle orientation readout with imaging","pmids":["37584777"],"is_preprint":false},{"year":2024,"finding":"The ULK1 complex effector BAG2 regulates AMBRA1 subcellular localization: in growth conditions, unphosphorylated BAG2 sequesters AMBRA1, attenuating autophagy; upon starvation, ULK1 phosphorylates BAG2 on Ser31, releasing AMBRA1 to be recruited to the ER membrane to promote autophagy.","method":"Affinity purification/proximity labeling mass spectrometry, Co-immunoprecipitation, phosphomimetic BAG2 mutants, AMBRA1 localization imaging, autophagy flux assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — AP-MS interactome validated by Co-IP and phosphomimetic mutants, direct localization with functional autophagy consequence","pmids":["39207901"],"is_preprint":false},{"year":2024,"finding":"AMBRA1 promotes intestinal inflammation in an autophagy-independent manner by competing with PP4R1/PP4c to bind IKK, thereby antagonizing IKK dephosphorylation and sustaining NF-κB pathway activation; IKKα phosphorylates AMBRA1 at S1043 to stabilize it by impairing its CUL4A-mediated K48-linked ubiquitination.","method":"Co-immunoprecipitation, in vitro phosphatase competition assay, AMBRA1 KO mouse colitis model, phosphomimetic S1043 mutant, ubiquitination assays","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 — biochemical competition assay, phosphosite mutagenesis, in vivo KO model, multiple orthogonal methods","pmids":["38424148"],"is_preprint":false},{"year":2025,"finding":"USP7 deubiquitinates AMBRA1 at K83 and K86 in response to H2O2, stabilizing AMBRA1; AMBRA1 in turn suppresses NRF2 by competing with DUB3 for binding to the N-terminal domain of NRF2 through its F1 domain, thereby antagonizing DUB3-mediated NRF2 deubiquitination and promoting NRF2 degradation.","method":"Co-immunoprecipitation, in vitro deubiquitination assay, ubiquitination site mapping (K83/K86), NRF2 stability assays, AMBRA1 domain mapping, USP7 inhibitor in vivo","journal":"Advanced science","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro deubiquitination assay with site mapping and domain mutagenesis; multiple orthogonal methods","pmids":["39887666"],"is_preprint":false},{"year":2018,"finding":"CRL4AMBRA1 ubiquitin ligase targets Elongin C (ELOC), the essential adapter of CRL5 complexes, for polyubiquitination and degradation, thereby disrupting CRL5 assembly and attenuating CRL5SOCS3 and CRL5VIF activities; AMBRA1 depletion leads to hyperactivation of both CRL5 complexes and altered IL-6/STAT3 signaling and HIV-1 infectivity.","method":"Proteomics, co-immunoprecipitation, in vitro ubiquitination assay, AMBRA1 KD with CRL5 activity and STAT3 signaling readouts","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — proteomics-identified substrate validated by ubiquitination assay and functional CRL5 activity readouts","pmids":["30166453"],"is_preprint":false},{"year":2017,"finding":"AMBRA1 interacts with α-synuclein, showing approximately ninefold stronger affinity for α-synuclein phosphorylated at serine 129 compared to non-phosphorylated α-synuclein; AMBRA1 silencing causes α-synuclein aggregation in primary neurons, and AMBRA1 overexpression reduces abnormal α-synuclein levels.","method":"Co-immunoprecipitation with binding affinity measurements, AMBRA1 siRNA knockdown in primary neurons, AMBRA1 overexpression, bafilomycin autophagy inhibition comparison","journal":"Brain pathology","confidence":"Medium","confidence_rationale":"Tier 3 — Co-IP with quantified affinity, KD with phenotypic readout; single lab","pmids":["27875637"],"is_preprint":false},{"year":2021,"finding":"AMBRA1 promotes dsRNA- and virus-induced apoptosis by interacting with and stabilizing MAVS at the mitochondria, preventing its proteasomal degradation; this effect requires caspase-8 and mitochondrial MAVS localization.","method":"Co-immunoprecipitation, MAVS stability assays with/without AMBRA1 KO, proteasome inhibitor experiments, caspase-8 inhibition, apoptosis assays","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal Co-IP with stability assay and functional apoptosis readout; single lab","pmids":["34859815"],"is_preprint":false}],"current_model":"AMBRA1 is a multifunctional intrinsically disordered scaffold protein that operates as a positive regulator of BECLIN1/VPS34-dependent autophagy by anchoring the core autophagy complex to dynein (via DLC1) in resting cells and releasing it to the ER upon ULK1-mediated phosphorylation; it acts as the substrate receptor of the CRL4 (DDB1-CUL4) E3 ubiquitin ligase to ubiquitinate and degrade all three D-type cyclins, thereby controlling G1-S transition and genome integrity; it supports ULK1 stability and activity through TRAF6-mediated K63-ubiquitylation; it regulates mitophagy via interaction with PINK1/ATAD3A to stabilize PINK1, and via IKKα-mediated phosphorylation at S1014 to promote LC3/GABARAP binding; it modulates c-Myc stability through PP2A recruitment and TGFβ signaling through nonproteolytic Smad4 ubiquitylation; and it is itself regulated by mTOR phosphorylation, caspase/calpain cleavage, CUL4-mediated degradation, RNF2-mediated K48-ubiquitylation, and USP7-mediated deubiquitylation, making it a central hub linking autophagy, cell cycle, mitophagy, apoptosis, and immune signaling."},"narrative":{"teleology":[{"year":2007,"claim":"The foundational discovery that AMBRA1 is a positive regulator of BECLIN1-dependent autophagy, and that its loss causes neural tube defects with impaired autophagy and excessive apoptosis, established AMBRA1 as a core autophagy gene with essential developmental functions.","evidence":"Mouse knockout/hypomorphic model, RNAi, and overexpression assays in Nature","pmids":["17589504"],"confidence":"High","gaps":["No binding interface or mechanism of action on BECLIN1 resolved","Molecular basis for the proliferation/apoptosis imbalance not identified"]},{"year":2010,"claim":"Determining that AMBRA1 physically tethers the BECLIN1-VPS34 complex to dynein via DLC1, and that ULK1 phosphorylation releases this complex for ER relocalization, resolved how autophagosome nucleation is spatially controlled and placed ULK1 upstream of AMBRA1.","evidence":"Reciprocal Co-IP, DLC1-binding site mutagenesis, ULK1 kinase assay, live-cell imaging","pmids":["20921139"],"confidence":"High","gaps":["ULK1 phosphorylation sites on AMBRA1 not mapped","Mechanism of ER membrane recruitment after dynein release unknown"]},{"year":2011,"claim":"Showing that AMBRA1 binds preferentially to mitochondrial BCL-2 and competes with BCL-2 for BECLIN1 binding linked AMBRA1 to the BCL-2/BECLIN1 regulatory node, while the discovery of Parkin-dependent AMBRA1 recruitment to depolarized mitochondria established AMBRA1 as a mitophagy effector that activates class III PI3K locally.","evidence":"Subcellular fractionation with Co-IP (BCL-2 study); TAP-MS from HEK293/SH-SY5Y/mouse brain with reciprocal Co-IP and AMBRA1 siRNA mitophagy readout (Parkin study)","pmids":["21358617","21753002"],"confidence":"High","gaps":["BCL-2 binding site on AMBRA1 not mapped","Direct mechanism by which AMBRA1 activates VPS34 at mitochondria unresolved"]},{"year":2012,"claim":"Demonstrating caspase cleavage at D482 and calpain-mediated degradation of AMBRA1 during apoptosis revealed that AMBRA1 destruction terminates pro-survival autophagy; this was extended in 2016 by showing the C-terminal cleavage fragment contains a BH3-like domain that directly inhibits BCL-2 to amplify apoptosis.","evidence":"In vitro cleavage assays, caspase non-cleavable mutant, BH3 domain mutagenesis with apoptosis readouts","pmids":["22441670","27123694"],"confidence":"High","gaps":["In vivo relevance of the BH3-fragment proapoptotic loop not tested","Calpain cleavage sites not precisely mapped"]},{"year":2013,"claim":"Establishing that mTOR phosphorylates AMBRA1 to suppress autophagy, and that upon mTOR inhibition AMBRA1 recruits TRAF6 to K63-ubiquitylate and stabilize ULK1, defined a bistable positive feedback loop (ULK1→AMBRA1→TRAF6→ULK1) governing the autophagy on/off switch.","evidence":"Co-IP, K63-linkage-specific ubiquitylation assays, mTOR inhibition/activation, ULK1 kinase assays","pmids":["23524951"],"confidence":"High","gaps":["mTOR phosphorylation sites on AMBRA1 not mapped","Whether TRAF6 is the sole E3 for ULK1 K63-ubiquitylation not resolved"]},{"year":2014,"claim":"Multiple 2014 discoveries expanded AMBRA1 beyond autophagy: CUL4 was shown to degrade AMBRA1 basally while AMBRA1 reciprocally inhibits CUL5 to stabilize DEPTOR; RNF2/WASH promotes K48-ubiquitylation of AMBRA1 at K45; and AMBRA1 recruits PP2A to dephosphorylate c-Myc, promoting its degradation and revealing AMBRA1 as a haploinsufficient tumor suppressor.","evidence":"Co-IP and ubiquitylation assays (CUL4/CUL5 and RNF2 studies); PP2A phosphatase assay, c-Myc stability assays, AMBRA1 KO tumor models (c-Myc study)","pmids":["25499913","24980959","25438055"],"confidence":"High","gaps":["CUL4 binding site on AMBRA1 not structurally resolved at this stage","CUL5 inhibition mechanism not fully dissected","PP2A subunit specificity for AMBRA1-mediated c-Myc dephosphorylation undefined"]},{"year":2017,"claim":"AMBRA1 was found to regulate spatial distribution of active Src kinase between focal adhesions and autophagic structures, controlling cancer cell invasion; separately, AMBRA1 was shown to bind phospho-S129 α-synuclein with ninefold higher affinity, with AMBRA1 loss causing α-synuclein aggregation in neurons.","evidence":"Interaction proteomics with Co-IP and live-cell phospho-Src imaging (Src study); Co-IP with binding affinity quantification and siRNA in primary neurons (α-synuclein study)","pmids":["28362576","27875637"],"confidence":"High","gaps":["Direct Src phosphorylation sites relevant to AMBRA1 not mapped","Whether AMBRA1-α-synuclein binding is direct or complex-mediated not resolved","In vivo neurodegeneration relevance not tested"]},{"year":2018,"claim":"Three discoveries in 2018 deepened the CRL4 and mitophagy axes: IKKα phosphorylation of AMBRA1 at S1014 enhances LC3/GABARAP binding for HUWE1-dependent mitophagy; MCL1 degradation by GSK-3β/HUWE1 licenses AMBRA1-dependent mitophagy; CRL4^AMBRA1 targets Elongin C for degradation to antagonize CRL5 complexes; and AMBRA1/PP2A stabilizes FOXO3 to drive FOXP3 transcription and Treg differentiation.","evidence":"In vitro kinase/phosphomimetic mutants with mitophagy readouts; proteomics-validated ubiquitination of Elongin C; PP2A activity assay with in vivo Treg models","pmids":["30217973","31434979","30166453","30513302"],"confidence":"High","gaps":["Full phosphorylation landscape of AMBRA1 during mitophagy not mapped","Whether CRL4-AMBRA1 targets Elongin C constitutively or conditionally unclear","PP2A holoenzyme composition in Treg context not specified"]},{"year":2019,"claim":"AMBRA1 was shown to scaffold TRIM32 to ULK1 in muscle cells, with TRIM32 activating ULK1 via K63-polyubiquitin chains; muscular dystrophy 2H mutations disrupt this interaction, linking AMBRA1 to disease-relevant autophagy regulation in skeletal muscle.","evidence":"In vitro ULK1 kinase assay, TRIM32 disease mutant analysis, autophagy flux in muscle cells","pmids":["31234693"],"confidence":"High","gaps":["Direct binding interface between AMBRA1 and TRIM32 not mapped","Whether AMBRA1 loss alone recapitulates the TRIM32 muscular phenotype untested"]},{"year":2020,"claim":"FRET-validated interaction of AMBRA1 with ERLIN1 at mitochondria-associated membranes (MAMs) showed that ganglioside GD3- and MFN2-dependent lipid raft-like microdomains provide a specific membrane platform for AMBRA1-dependent autophagosome formation.","evidence":"Co-IP, FRET analysis at MAMs, siRNA knockdown of ERLIN1/ST8SIA1/MFN2 with autophagy flux readout","pmids":["33034545"],"confidence":"High","gaps":["Whether ERLIN1 binding is direct or via an intermediate not resolved","Lipid composition requirements beyond GD3 not characterized"]},{"year":2021,"claim":"A breakthrough year established AMBRA1 as the D-type cyclin-degrading substrate receptor of CRL4: three simultaneous Nature papers showed CRL4^AMBRA1 ubiquitylates cyclin D1/D2/D3, cancer hotspot mutations escape this degradation, and AMBRA1 loss causes replication stress with CHK1 synthetic lethality; concurrently, AMBRA1 was shown to stabilize PINK1 at the OMM by counteracting ATAD3A-mediated import, to K63-ubiquitylate Smad4 for TGFβ signaling, and to stabilize MAVS for antiviral apoptosis.","evidence":"Genome-wide CRISPR screens, reconstituted ubiquitylation, in vivo mouse models (cyclin D papers); Co-IP at OMM fractions with epistasis analysis (PINK1); in vitro K63-ubiquitylation and metastasis models (Smad4); Co-IP and MAVS stability assays (MAVS)","pmids":["33854235","33854239","33854232","34798798","34362797","34859815"],"confidence":"High","gaps":["Structural basis of cyclin D recognition by AMBRA1 not yet resolved at this stage","Whether Smad4 K63-ubiquitylation occurs genome-wide or at specific loci undefined","MAVS stabilization mechanism awaits independent confirmation"]},{"year":2022,"claim":"Muscle-specific AMBRA1 conditional knockout demonstrated in vivo that AMBRA1 is required for mitophagic flux in skeletal muscle, with its loss causing mitochondrial swelling, impaired DRP1/Parkin recruitment, and reduced oxidative fiber proportion.","evidence":"Conditional KO (Ambra1fl/fl:Mlc1f-Cre), electron microscopy, respiratory complex assay, AMBRA1 overexpression rescue","pmids":["35593053"],"confidence":"High","gaps":["Whether AMBRA1 acts through PINK1/PARKIN or HUWE1 pathway in muscle not resolved","Contribution of autophagy-independent AMBRA1 functions to the muscle phenotype unclear"]},{"year":2023,"claim":"The 3.08 Å cryo-EM structure of AMBRA1-DDB1 revealed that AMBRA1's N-terminal helix-loop-helix and WD40 domain engage DDB1's double-propeller, providing the first structural basis for CRL4^AMBRA1 assembly and cyclin D ubiquitylation; separately, CDK1/PLK1-dependent mitotic phosphorylation of AMBRA1 was shown to regulate NUMA1 localization and spindle orientation.","evidence":"Cryo-EM at 3.08 Å with HDX-MS and DDB1-binding mutants validated by ubiquitylation and cell cycle assays; in vitro CDK1/PLK1 kinase assays with phosphomutants and live-cell spindle imaging","pmids":["37993427","37584777"],"confidence":"High","gaps":["No structure with a cyclin D substrate bound","Mitotic phosphosite identities and their individual contributions to spindle orientation not fully dissected"]},{"year":2024,"claim":"New regulatory inputs were defined: BAG2, a ULK1 complex effector, sequesters AMBRA1 until ULK1 phosphorylates BAG2 at S31 to release AMBRA1 for ER recruitment; independently, AMBRA1 was shown to sustain NF-κB signaling in an autophagy-independent manner by competitively blocking PP4R1/PP4c dephosphorylation of IKK, with IKKα phosphorylating AMBRA1 at S1043 to prevent its CUL4A-mediated degradation.","evidence":"AP-MS/proximity labeling with Co-IP and phosphomimetic BAG2 mutants (BAG2 study); in vitro phosphatase competition assay, AMBRA1 KO colitis model, S1043 phosphomimetic with ubiquitylation assay (NF-κB study)","pmids":["39207901","38424148"],"confidence":"High","gaps":["BAG2-AMBRA1 binding interface not structurally resolved","Whether BAG2-dependent regulation is universal or cell-type-specific unclear","Full IKK substrate landscape of AMBRA1 phosphorylation sites not mapped"]},{"year":2025,"claim":"USP7 was identified as the deubiquitinase stabilizing AMBRA1 at K83/K86 under oxidative stress; stabilized AMBRA1 suppresses NRF2 by competitively displacing DUB3 from NRF2's N-terminus, linking AMBRA1 to redox homeostasis control.","evidence":"In vitro deubiquitination assay, K83/K86 site mapping, domain mutagenesis (F1 domain), NRF2 stability assays, USP7 inhibitor in vivo","pmids":["39887666"],"confidence":"High","gaps":["Whether USP7-AMBRA1-NRF2 axis operates during autophagy or independently unclear","In vivo relevance of NRF2 suppression by AMBRA1 in specific tissues not tested"]},{"year":null,"claim":"Major open questions remain: no full-length AMBRA1 structure exists; the structural basis for cyclin D and other substrate recognition by CRL4^AMBRA1 is unresolved; the relative contributions of AMBRA1's autophagy-dependent versus autophagy-independent functions in tumorigenesis and inflammation need systematic dissection; and the complete phosphorylation code governing AMBRA1's switch between its multiple effector modes is unknown.","evidence":"","pmids":[],"confidence":"Low","gaps":["No full-length AMBRA1 structure","Cyclin D substrate-bound CRL4 structure lacking","Systematic separation of autophagy-dependent vs independent functions in vivo needed"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1,5,14,15]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[6,7,16,17,26,27]},{"term_id":"GO:0038024","term_label":"cargo receptor activity","supporting_discovery_ids":[16,19,23,28]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[1,15,25]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[2,3,11,18,22]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[1,6,25]}],"pathway":[{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[0,1,2,5,6,14,15,25]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[16,17,23,24]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[4,9,30]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[6,8,16,19,23,28]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[7,12,19,26]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[12,26,28,30]}],"complexes":["CRL4(DDB1-CUL4A)","BECLIN1-VPS34 autophagy initiation complex","ULK1 complex"],"partners":["BECN1","DDB1","ULK1","TRAF6","PRKN","DLC1","PP2A","PINK1"],"other_free_text":[]},"mechanistic_narrative":"AMBRA1 is an intrinsically disordered scaffold protein that integrates autophagy initiation, cell cycle control, mitophagy, and inflammatory signaling through its dual roles as a BECLIN1-VPS34 complex regulator and as the substrate receptor of the CRL4(DDB1-CUL4) E3 ubiquitin ligase. In resting cells, AMBRA1 tethers the BECLIN1-VPS34 autophagy initiation complex to the dynein motor via DLC1; upon starvation, ULK1 phosphorylates AMBRA1, releasing the complex for ER-localized autophagosome nucleation, while AMBRA1 simultaneously recruits TRAF6 to K63-ubiquitylate and stabilize ULK1, forming a positive feedback loop [PMID:20921139, PMID:23524951, PMID:25499913]. As the substrate receptor of CRL4^AMBRA1, it ubiquitylates and degrades all three D-type cyclins to enforce the G1-S checkpoint—loss of AMBRA1 causes replication stress and genomic instability—and also targets Elongin C to antagonize CRL5 activity, and mediates nonproteolytic K63-ubiquitylation of Smad4 to potentiate TGFβ signaling [PMID:33854235, PMID:33854232, PMID:30166453, PMID:34362797]. AMBRA1 further promotes PINK1/PARKIN-dependent and HUWE1-dependent mitophagy by stabilizing PINK1 at the outer mitochondrial membrane and by IKKα-mediated phosphorylation (S1014) that enhances LC3/GABARAP binding, and it modulates NF-κB signaling in an autophagy-independent manner by competing with PP4R1 for IKK binding [PMID:34798798, PMID:30217973, PMID:38424148, PMID:21753002]."},"prefetch_data":{"uniprot":{"accession":"Q9C0C7","full_name":"Activating molecule in BECN1-regulated autophagy protein 1","aliases":["DDB1- and CUL4-associated factor 3"],"length_aa":1298,"mass_kda":142.5,"function":"Substrate-recognition component of a DCX (DDB1-CUL4-X-box) E3 ubiquitin-protein ligase complex involved in cell cycle control and autophagy (PubMed:20921139, PubMed:23524951, PubMed:24587252, PubMed:32333458, PubMed:33854232, PubMed:33854235, PubMed:33854239). The DCX(AMBRA1) complex specifically mediates the polyubiquitination of target proteins such as BECN1, CCND1, CCND2, CCND3, ELOC and ULK1 (PubMed:23524951, PubMed:33854232, PubMed:33854235, PubMed:33854239). Acts as an upstream master regulator of the transition from G1 to S cell phase: AMBRA1 specifically recognizes and binds phosphorylated cyclin-D (CCND1, CCND2 and CCND3), leading to cyclin-D ubiquitination by the DCX(AMBRA1) complex and subsequent degradation (PubMed:33854232, PubMed:33854235, PubMed:33854239). By controlling the transition from G1 to S phase and cyclin-D degradation, AMBRA1 acts as a tumor suppressor that promotes genomic integrity during DNA replication and counteracts developmental abnormalities and tumor growth (PubMed:33854232, PubMed:33854235, PubMed:33854239). AMBRA1 also regulates the cell cycle by promoting MYC dephosphorylation and degradation independently of the DCX(AMBRA1) complex: acts via interaction with the catalytic subunit of protein phosphatase 2A (PPP2CA), which enhances interaction between PPP2CA and MYC, leading to MYC dephosphorylation and degradation (PubMed:25438055, PubMed:25803737). Acts as a regulator of Cul5-RING (CRL5) E3 ubiquitin-protein ligase complexes by mediating ubiquitination and degradation of Elongin-C (ELOC) component of CRL5 complexes (PubMed:25499913, PubMed:30166453). Acts as a key regulator of autophagy by modulating the BECN1-PIK3C3 complex: controls protein turnover during neuronal development, and regulates normal cell survival and proliferation (PubMed:21358617). In normal conditions, AMBRA1 is tethered to the cytoskeleton via interaction with dyneins DYNLL1 and DYNLL2 (PubMed:20921139). Upon autophagy induction, AMBRA1 is released from the cytoskeletal docking site to induce autophagosome nucleation by mediating ubiquitination of proteins involved in autophagy (PubMed:20921139). The DCX(AMBRA1) complex mediates 'Lys-63'-linked ubiquitination of BECN1, increasing the association between BECN1 and PIK3C3 to promote PIK3C3 activity (By similarity). In collaboration with TRAF6, AMBRA1 mediates 'Lys-63'-linked ubiquitination of ULK1 following autophagy induction, promoting ULK1 stability and kinase activity (PubMed:23524951). Also activates ULK1 via interaction with TRIM32: TRIM32 stimulates ULK1 through unanchored 'Lys-63'-linked polyubiquitin chains (PubMed:31123703). Also acts as an activator of mitophagy via interaction with PRKN and LC3 proteins (MAP1LC3A, MAP1LC3B or MAP1LC3C); possibly by bringing damaged mitochondria onto autophagosomes (PubMed:21753002, PubMed:25215947). Also activates mitophagy by acting as a cofactor for HUWE1; acts by promoting HUWE1-mediated ubiquitination of MFN2 (PubMed:30217973). AMBRA1 is also involved in regulatory T-cells (Treg) differentiation by promoting FOXO3 dephosphorylation independently of the DCX(AMBRA1) complex: acts via interaction with PPP2CA, which enhances interaction between PPP2CA and FOXO3, leading to FOXO3 dephosphorylation and stabilization (PubMed:30513302). May act as a regulator of intracellular trafficking, regulating the localization of active PTK2/FAK and SRC (By similarity). Also involved in transcription regulation by acting as a scaffold for protein complexes at chromatin (By similarity)","subcellular_location":"Endoplasmic reticulum; Cytoplasm, cytoskeleton; Cytoplasmic vesicle, autophagosome; Mitochondrion; Cytoplasm, cytosol; Nucleus; Cell junction, focal adhesion","url":"https://www.uniprot.org/uniprotkb/Q9C0C7/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/AMBRA1","classification":"Not Classified","n_dependent_lines":209,"n_total_lines":1208,"dependency_fraction":0.17301324503311258},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000110497","cell_line_id":"CID001844","localizations":[{"compartment":"nucleoplasm","grade":3},{"compartment":"cytoplasmic","grade":2}],"interactors":[{"gene":"RBM25","stoichiometry":0.2},{"gene":"DDB1","stoichiometry":0.2},{"gene":"DYNLL1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID001844","total_profiled":1310},"omim":[{"mim_id":"618222","title":"MITOCHONDRIAL COMPLEX I DEFICIENCY, NUCLEAR TYPE 2; MC1DN2","url":"https://www.omim.org/entry/618222"},{"mim_id":"615687","title":"BECLIN 2; BECN2","url":"https://www.omim.org/entry/615687"},{"mim_id":"611359","title":"ACTIVATING MOLECULE IN BECLIN 1-REGULATED AUTOPHAGY; AMBRA1","url":"https://www.omim.org/entry/611359"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Vesicles","reliability":"Approved"},{"location":"Mitochondria","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/AMBRA1"},"hgnc":{"alias_symbol":["FLJ20294","KIAA1736","WDR94","DCAF3"],"prev_symbol":[]},"alphafold":{"accession":"Q9C0C7","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9C0C7","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9C0C7-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9C0C7-F1-predicted_aligned_error_v6.png","plddt_mean":48.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=AMBRA1","jax_strain_url":"https://www.jax.org/strain/search?query=AMBRA1"},"sequence":{"accession":"Q9C0C7","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9C0C7.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9C0C7/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9C0C7"}},"corpus_meta":[{"pmid":"17589504","id":"PMC_17589504","title":"Ambra1 regulates autophagy and development of the nervous 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autophagy initiation via AMBRA1-ERLIN1 molecular association within MAMs.","date":"2020","source":"Autophagy","url":"https://pubmed.ncbi.nlm.nih.gov/33034545","citation_count":69,"is_preprint":false},{"pmid":"32942015","id":"PMC_32942015","title":"miR-103a-3p regulates mitophagy in Parkinson's disease through Parkin/Ambra1 signaling.","date":"2020","source":"Pharmacological research","url":"https://pubmed.ncbi.nlm.nih.gov/32942015","citation_count":67,"is_preprint":false},{"pmid":"34798798","id":"PMC_34798798","title":"AMBRA1 regulates mitophagy by interacting with ATAD3A and promoting PINK1 stability.","date":"2021","source":"Autophagy","url":"https://pubmed.ncbi.nlm.nih.gov/34798798","citation_count":66,"is_preprint":false},{"pmid":"31434979","id":"PMC_31434979","title":"HUWE1 controls MCL1 stability to unleash AMBRA1-induced mitophagy.","date":"2019","source":"Cell death and 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and excessive apoptosis.\",\n      \"method\": \"RNA interference in vitro, overexpression assays, and mouse knockout/hypomorphic model with phenotypic readout\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — foundational study with multiple orthogonal methods (RNAi, OE, in vivo KO), highly cited and replicated\",\n      \"pmids\": [\"17589504\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"AMBRA1 tethers the BECLIN1-VPS34 core complex to the dynein motor through direct interaction with dynein light chains 1/2 (DLC1/2); upon autophagy induction, ULK1 phosphorylates AMBRA1, releasing the complex from dynein and allowing its relocalization to the ER where autophagosome nucleation occurs.\",\n      \"method\": \"Co-immunoprecipitation, live-cell imaging, ULK1 kinase assay, dominant-negative DLC1 experiments, AMBRA1 DLC1-binding site mutagenesis\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reciprocal Co-IP, mutagenesis of binding sites, kinase assay, direct localization with functional consequence; independently replicated\",\n      \"pmids\": [\"20921139\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"AMBRA1 binds preferentially to the mitochondrial pool of BCL-2; upon autophagy induction this interaction is disrupted, releasing AMBRA1 to promote BECLIN1 activity; AMBRA1 can compete with both mitochondrial and ER-resident BCL-2 for BECLIN1 binding.\",\n      \"method\": \"Co-immunoprecipitation, subcellular fractionation, overexpression and knockdown assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP with fractionation showing organelle-specific interaction, functional competition assay\",\n      \"pmids\": [\"21358617\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Parkin interacts with AMBRA1 and this interaction increases strongly during prolonged mitochondrial depolarization; AMBRA1 is recruited in a Parkin-dependent manner to perinuclear clusters of depolarized mitochondria and activates PI3K (class III) locally to promote mitophagy; AMBRA1 is not required for Parkin translocation but is critical for subsequent mitochondrial clearance.\",\n      \"method\": \"Tandem affinity purification/mass spectrometry, reciprocal co-immunoprecipitation from HEK293, SH-SY5Y, and mouse brain; AMBRA1 siRNA knockdown with mitophagy readout\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — MS-identified interactor validated by reciprocal Co-IP in multiple cell types including brain; KD with defined mitophagy phenotype\",\n      \"pmids\": [\"21753002\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"During apoptosis, AMBRA1 is cleaved by caspases at D482 and further degraded by calpains; a caspase non-cleavable AMBRA1 mutant prolongs autophagy and counteracts cell death; AMBRA1 downregulation sensitizes cells to apoptotic stimuli.\",\n      \"method\": \"In vitro cleavage assays, caspase/calpain inhibitor experiments, caspase non-cleavable mutant, siRNA knockdown with apoptosis readout\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro cleavage assay combined with mutagenesis and functional readout\",\n      \"pmids\": [\"22441670\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Under non-autophagic conditions, mTOR inhibits AMBRA1 by phosphorylation; upon autophagy induction AMBRA1 is dephosphorylated and then interacts with the E3 ligase TRAF6 to promote K63-linked ubiquitylation and stabilization of ULK1, forming a positive feedback loop with ULK1-mediated AMBRA1 phosphorylation.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitylation assays (K63 linkage-specific), phosphorylation assays, mTOR inhibition/activation experiments, ULK1 kinase assays\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal biochemical methods demonstrating the regulatory loop; highly cited\",\n      \"pmids\": [\"23524951\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Cullin-4 (CRL4) binds AMBRA1 under basal conditions to limit its abundance via degradation; ULK1-dependent phosphorylation upon autophagy induction causes Cullin-4 to release AMBRA1; the re-established Cullin-4/AMBRA1 interaction terminates autophagy by degrading AMBRA1. Upon Cullin-4 dissociation, AMBRA1 binds and inhibits Cullin-5, stabilizing the mTOR inhibitor DEPTOR to create a positive feedback loop for autophagy onset.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitylation assays, siRNA knockdown, autophagy flux assays\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods; mechanistic dissection of dynamic CRL interactions with functional consequence\",\n      \"pmids\": [\"25499913\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"AMBRA1 promotes c-Myc dephosphorylation and degradation by directly facilitating the interaction between c-Myc and the phosphatase PP2A; when mTOR is inhibited, AMBRA1 enhances PP2A activity toward c-Myc, reducing cell division rate; loss of AMBRA1 increases tumorigenesis, identifying AMBRA1 as a haploinsufficient tumor suppressor.\",\n      \"method\": \"Co-immunoprecipitation, PP2A phosphatase assay, c-Myc stability assays, AMBRA1 KO/KD with proliferation and tumor growth readouts\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including biochemical phosphatase assay and in vivo tumor models; replicated by multiple groups\",\n      \"pmids\": [\"25438055\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"RNF2 associates with AMBRA1 and acts as an E3 ligase to ubiquitinate AMBRA1 via K48-linked chains at lysine 45, promoting its proteasomal degradation; WASH recruits RNF2 to AMBRA1 to mediate this degradation and thereby downregulate autophagy.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitination assay, ubiquitin linkage determination, RNF2 knockdown/overexpression with autophagy flux readout\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro ubiquitination assay with site mapping (K45) and functional autophagy readout\",\n      \"pmids\": [\"24980959\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The C-terminal part of AMBRA1, generated by caspase cleavage during apoptosis, contains a BH3-like domain that directly binds and inhibits the antiapoptotic factor BCL2, creating a proapoptotic positive feedback loop.\",\n      \"method\": \"Co-immunoprecipitation, caspase cleavage assays, BH3 domain mutagenesis, apoptosis assays\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — biochemical demonstration of BH3-domain-dependent BCL2 binding with functional apoptosis consequence\",\n      \"pmids\": [\"27123694\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"AMBRA1 regulates the spatial activity of Src kinase; it binds both FAK and Src in cancer cells and controls targeting of active phospho-Src away from focal adhesions into autophagic structures. When FAK is present, AMBRA1 is recruited to focal adhesions promoting direction-sensing invasion; trafficking partners Dynactin 1 and IFITM3 were identified as AMBRA1 binding partners by interaction proteomics.\",\n      \"method\": \"Co-immunoprecipitation, interaction proteomics, live-cell imaging of phospho-Src localization, invasion assays, FAK/AMBRA1 mutant analysis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — proteomics-identified interactors validated by Co-IP; functional localization experiments with direct phenotypic consequence\",\n      \"pmids\": [\"28362576\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The E3 ubiquitin ligase HUWE1 is required for AMBRA1-mediated mitophagy independently of PINK1/PARKIN; IKKα phosphorylates AMBRA1 at serine 1014, promoting structural changes in AMBRA1 that increase its interaction with LC3/GABARAP proteins and mitophagic activity.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, phosphomimetic/phosphodeficient mutants, HUWE1 and IKKα knockdown/KO with mitophagy readout (mitochondrial markers, LC3 co-localization)\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — kinase assay, phosphosite mutagenesis, multiple orthogonal methods; novel regulatory pathway established\",\n      \"pmids\": [\"30217973\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"AMBRA1 promotes Treg differentiation by interacting with the phosphatase PP2A to stabilize the transcriptional activator FOXO3, which in turn triggers FOXP3 transcription; this pathway was validated in mouse models of tumor growth and multiple sclerosis.\",\n      \"method\": \"Co-immunoprecipitation, PP2A activity assay, FOXO3/FOXP3 reporter assays, AMBRA1 KD with Treg differentiation readout in vivo\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — biochemical phosphatase interaction assay, transcriptional readout, in vivo validation\",\n      \"pmids\": [\"30513302\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"HUWE1-mediated regulation of MCL1 stability controls AMBRA1-mediated mitophagy: MCL1 overexpression inhibits HUWE1 recruitment to mitochondria; GSK-3β phosphorylates MCL1 at S159 during AMBRA1-mediated mitophagy, triggering HUWE1-dependent MCL1 degradation and enabling mitophagy.\",\n      \"method\": \"Co-immunoprecipitation, mitophagy flux assay, GSK-3β inhibition, phosphomimetic MCL1 mutants, HUWE1 and MCL1 overexpression/knockdown\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal biochemical methods with defined phosphosite and functional mitophagy readout\",\n      \"pmids\": [\"31434979\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The E3 ubiquitin ligase TRIM32 activates ULK1 kinase activity in muscle cells through unanchored K63-linked polyubiquitin chains; AMBRA1 acts as a scaffold that conveys TRIM32 to ULK1; muscular dystrophy 2H mutations in TRIM32 disrupt its ability to bind ULK1 and induce autophagy.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ULK1 kinase assay, ubiquitin chain type determination, TRIM32 disease mutant analysis, autophagy flux assay in muscle cells\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro kinase assay combined with disease mutant validation and functional autophagy readout\",\n      \"pmids\": [\"31234693\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"AMBRA1 interacts with ERLIN1 at MAM (mitochondria-associated membrane) raft-like microdomains; this interaction is essential for autophagosome formation upon nutrient starvation and depends on ganglioside GD3 and MFN2 integrity.\",\n      \"method\": \"Co-immunoprecipitation, FRET analysis, subcellular fractionation to MAMs, siRNA knockdown of ERLIN1/ST8SIA1/MFN2 with autophagy flux readout\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — FRET validation of interaction at specific membrane domain, functional genetic dissection with multiple KDs\",\n      \"pmids\": [\"33034545\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AMBRA1 functions as the substrate receptor for the CRL4 (cullin 4) E3 ubiquitin ligase complex (CRL4AMBRA1/CRL4DCAF3) that targets all three D-type cyclins (cyclin D1, D2, D3) for ubiquitylation and proteasomal degradation; cancer hotspot mutations in D-type cyclins abrogate their binding to AMBRA1 and stabilize them.\",\n      \"method\": \"Biochemical ubiquitylation assays, genetic KO in somatic cells and mice, genome-wide CRISPR screen, Co-immunoprecipitation, CDK4/6 inhibitor treatment, in vivo mouse models\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reconstituted ubiquitylation, confirmed by three independent groups simultaneously, CRISPR screen, in vivo validation; Strong evidence\",\n      \"pmids\": [\"33854235\", \"33854239\", \"33854232\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AMBRA1 regulates G1-to-S transition and replication-phase entry by controlling D-type cyclin abundance through both proteasomal degradation and MYC/MYCN-mediated transcription; AMBRA1 loss causes replication stress and genomic instability; CHK1 kinase is a synthetic lethal target in AMBRA1-deficient tumors.\",\n      \"method\": \"Cell cycle analysis, cyclin D protein stability assays, DNA damage markers, AMBRA1 KO mouse models, CHK1 inhibitor sensitivity assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic and biochemical approaches with multiple in vivo and in vitro readouts; simultaneous publication with two other Nature papers\",\n      \"pmids\": [\"33854232\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AMBRA1 is recruited to the outer mitochondrial membrane (OMM) upon mitochondrial depolarization where it interacts with PINK1 and ATAD3A; AMBRA1 promotes PINK1 stability by counteracting ATAD3A-mediated import and LONP1-dependent degradation of PINK1, thereby facilitating PINK1-PARKIN mitophagy.\",\n      \"method\": \"Co-immunoprecipitation at OMM fractions, AMBRA1/ATAD3A siRNA knockdown, PINK1 stability assays, mitophagy flux (phospho-ubiquitin, PARKIN recruitment)\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP at specific subcellular compartment, epistasis (ATAD3A KD rescues AMBRA1 KD phenotype), multiple orthogonal methods\",\n      \"pmids\": [\"34798798\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AMBRA1 acts as a substrate receptor for the CRL4 complex to mediate nonproteolytic K63-linked polyubiquitylation of Smad4, enhancing its transcriptional activity and TGFβ signaling, thereby promoting TGFβ-induced EMT, migration, and invasion of breast cancer cells.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitination assay (K63 linkage determination), Smad4 transcriptional reporter assay, AMBRA1 KD with EMT/invasion readouts, mouse breast cancer metastasis model\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro ubiquitination with linkage specificity, functional TGFβ reporter, in vivo metastasis model\",\n      \"pmids\": [\"34362797\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"HPV E7 protein interacts with AMBRA1, competes with its binding to BECLIN1, and triggers calpain-dependent AMBRA1 degradation, thereby reducing autophagy activity in HPV-positive oropharyngeal squamous cell carcinoma cells.\",\n      \"method\": \"Co-immunoprecipitation, calpain inhibitor experiments, AMBRA1 and BECLIN1 binding competition assays, autophagy flux assays in HPV+ vs HPV- cells\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP competition assay with calpain pharmacological validation and functional autophagy readout\",\n      \"pmids\": [\"33172332\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AMBRA1 suppresses SOCS3 to maintain STAT3 activation in medulloblastoma; this c-MYC/AMBRA1/STAT3 axis regulates stem cell potential, growth, and migration of Group 3 medulloblastoma.\",\n      \"method\": \"AMBRA1 knockdown in MB stem cells, STAT3 reporter assays, SOCS3 rescue experiments, sphere-forming and invasion assays, autophagy inhibition\",\n      \"journal\": \"Acta neuropathologica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KD with pathway rescue, but single lab\",\n      \"pmids\": [\"34302498\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Muscle-specific AMBRA1 knockout in mice leads to impaired mitophagic flux, accumulation of TOMM20, swollen mitochondria, decreased DRP1 and Parkin recruitment to mitochondria, lysosomal accumulation, and reduced oxidative fiber proportion; AMBRA1 overexpression in wild-type muscle is sufficient to enhance mitochondrial clearance.\",\n      \"method\": \"Muscle-specific conditional KO (Ambra1fl/fl:Mlc1f-Cre), AMBRA1 overexpression in vivo, mitochondrial fractionation, electron microscopy, respiratory complex activity assay\",\n      \"journal\": \"Journal of cachexia, sarcopenia and muscle\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with tissue-specific phenotype, confirmed by OE experiments, multiple orthogonal readouts\",\n      \"pmids\": [\"35593053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Cryo-EM structure of AMBRA1 in complex with DDB1 at 3.08 Å resolution reveals that AMBRA1's N-terminal helix-loop-helix motif and WD40 domain associate with the double-propeller fold of DDB1; DDB1-binding-defective AMBRA1 mutants prevent ubiquitination of cyclin D1 in vitro and increase cell cycle progression.\",\n      \"method\": \"Cryo-EM structure determination, hydrogen-deuterium exchange mass spectrometry (HDX-MS), DDB1-binding mutants, in vitro ubiquitination assay, cell cycle analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — atomic resolution cryo-EM structure with mutagenesis validation and in vitro reconstitution of ubiquitination\",\n      \"pmids\": [\"37993427\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"AMBRA1 is phosphorylated during mitosis on multiple sites by CDK1 and PLK1; this phosphorylation is required for proper mitotic spindle orientation through regulation of NUMA1 localization and dynamics.\",\n      \"method\": \"In vitro CDK1/PLK1 kinase assays, phosphomimetic/phosphodeficient AMBRA1 mutants, live-cell imaging of spindle orientation, NUMA1 localization analysis, AMBRA1 KD\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro kinase assay with mutagenesis, functional spindle orientation readout with imaging\",\n      \"pmids\": [\"37584777\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The ULK1 complex effector BAG2 regulates AMBRA1 subcellular localization: in growth conditions, unphosphorylated BAG2 sequesters AMBRA1, attenuating autophagy; upon starvation, ULK1 phosphorylates BAG2 on Ser31, releasing AMBRA1 to be recruited to the ER membrane to promote autophagy.\",\n      \"method\": \"Affinity purification/proximity labeling mass spectrometry, Co-immunoprecipitation, phosphomimetic BAG2 mutants, AMBRA1 localization imaging, autophagy flux assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — AP-MS interactome validated by Co-IP and phosphomimetic mutants, direct localization with functional autophagy consequence\",\n      \"pmids\": [\"39207901\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"AMBRA1 promotes intestinal inflammation in an autophagy-independent manner by competing with PP4R1/PP4c to bind IKK, thereby antagonizing IKK dephosphorylation and sustaining NF-κB pathway activation; IKKα phosphorylates AMBRA1 at S1043 to stabilize it by impairing its CUL4A-mediated K48-linked ubiquitination.\",\n      \"method\": \"Co-immunoprecipitation, in vitro phosphatase competition assay, AMBRA1 KO mouse colitis model, phosphomimetic S1043 mutant, ubiquitination assays\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — biochemical competition assay, phosphosite mutagenesis, in vivo KO model, multiple orthogonal methods\",\n      \"pmids\": [\"38424148\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"USP7 deubiquitinates AMBRA1 at K83 and K86 in response to H2O2, stabilizing AMBRA1; AMBRA1 in turn suppresses NRF2 by competing with DUB3 for binding to the N-terminal domain of NRF2 through its F1 domain, thereby antagonizing DUB3-mediated NRF2 deubiquitination and promoting NRF2 degradation.\",\n      \"method\": \"Co-immunoprecipitation, in vitro deubiquitination assay, ubiquitination site mapping (K83/K86), NRF2 stability assays, AMBRA1 domain mapping, USP7 inhibitor in vivo\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro deubiquitination assay with site mapping and domain mutagenesis; multiple orthogonal methods\",\n      \"pmids\": [\"39887666\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CRL4AMBRA1 ubiquitin ligase targets Elongin C (ELOC), the essential adapter of CRL5 complexes, for polyubiquitination and degradation, thereby disrupting CRL5 assembly and attenuating CRL5SOCS3 and CRL5VIF activities; AMBRA1 depletion leads to hyperactivation of both CRL5 complexes and altered IL-6/STAT3 signaling and HIV-1 infectivity.\",\n      \"method\": \"Proteomics, co-immunoprecipitation, in vitro ubiquitination assay, AMBRA1 KD with CRL5 activity and STAT3 signaling readouts\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — proteomics-identified substrate validated by ubiquitination assay and functional CRL5 activity readouts\",\n      \"pmids\": [\"30166453\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"AMBRA1 interacts with α-synuclein, showing approximately ninefold stronger affinity for α-synuclein phosphorylated at serine 129 compared to non-phosphorylated α-synuclein; AMBRA1 silencing causes α-synuclein aggregation in primary neurons, and AMBRA1 overexpression reduces abnormal α-synuclein levels.\",\n      \"method\": \"Co-immunoprecipitation with binding affinity measurements, AMBRA1 siRNA knockdown in primary neurons, AMBRA1 overexpression, bafilomycin autophagy inhibition comparison\",\n      \"journal\": \"Brain pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — Co-IP with quantified affinity, KD with phenotypic readout; single lab\",\n      \"pmids\": [\"27875637\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AMBRA1 promotes dsRNA- and virus-induced apoptosis by interacting with and stabilizing MAVS at the mitochondria, preventing its proteasomal degradation; this effect requires caspase-8 and mitochondrial MAVS localization.\",\n      \"method\": \"Co-immunoprecipitation, MAVS stability assays with/without AMBRA1 KO, proteasome inhibitor experiments, caspase-8 inhibition, apoptosis assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP with stability assay and functional apoptosis readout; single lab\",\n      \"pmids\": [\"34859815\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"AMBRA1 is a multifunctional intrinsically disordered scaffold protein that operates as a positive regulator of BECLIN1/VPS34-dependent autophagy by anchoring the core autophagy complex to dynein (via DLC1) in resting cells and releasing it to the ER upon ULK1-mediated phosphorylation; it acts as the substrate receptor of the CRL4 (DDB1-CUL4) E3 ubiquitin ligase to ubiquitinate and degrade all three D-type cyclins, thereby controlling G1-S transition and genome integrity; it supports ULK1 stability and activity through TRAF6-mediated K63-ubiquitylation; it regulates mitophagy via interaction with PINK1/ATAD3A to stabilize PINK1, and via IKKα-mediated phosphorylation at S1014 to promote LC3/GABARAP binding; it modulates c-Myc stability through PP2A recruitment and TGFβ signaling through nonproteolytic Smad4 ubiquitylation; and it is itself regulated by mTOR phosphorylation, caspase/calpain cleavage, CUL4-mediated degradation, RNF2-mediated K48-ubiquitylation, and USP7-mediated deubiquitylation, making it a central hub linking autophagy, cell cycle, mitophagy, apoptosis, and immune signaling.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"AMBRA1 is an intrinsically disordered scaffold protein that integrates autophagy initiation, cell cycle control, mitophagy, and inflammatory signaling through its dual roles as a BECLIN1-VPS34 complex regulator and as the substrate receptor of the CRL4(DDB1-CUL4) E3 ubiquitin ligase. In resting cells, AMBRA1 tethers the BECLIN1-VPS34 autophagy initiation complex to the dynein motor via DLC1; upon starvation, ULK1 phosphorylates AMBRA1, releasing the complex for ER-localized autophagosome nucleation, while AMBRA1 simultaneously recruits TRAF6 to K63-ubiquitylate and stabilize ULK1, forming a positive feedback loop [PMID:20921139, PMID:23524951, PMID:25499913]. As the substrate receptor of CRL4^AMBRA1, it ubiquitylates and degrades all three D-type cyclins to enforce the G1-S checkpoint—loss of AMBRA1 causes replication stress and genomic instability—and also targets Elongin C to antagonize CRL5 activity, and mediates nonproteolytic K63-ubiquitylation of Smad4 to potentiate TGFβ signaling [PMID:33854235, PMID:33854232, PMID:30166453, PMID:34362797]. AMBRA1 further promotes PINK1/PARKIN-dependent and HUWE1-dependent mitophagy by stabilizing PINK1 at the outer mitochondrial membrane and by IKKα-mediated phosphorylation (S1014) that enhances LC3/GABARAP binding, and it modulates NF-κB signaling in an autophagy-independent manner by competing with PP4R1 for IKK binding [PMID:34798798, PMID:30217973, PMID:38424148, PMID:21753002].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"The foundational discovery that AMBRA1 is a positive regulator of BECLIN1-dependent autophagy, and that its loss causes neural tube defects with impaired autophagy and excessive apoptosis, established AMBRA1 as a core autophagy gene with essential developmental functions.\",\n      \"evidence\": \"Mouse knockout/hypomorphic model, RNAi, and overexpression assays in Nature\",\n      \"pmids\": [\"17589504\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No binding interface or mechanism of action on BECLIN1 resolved\", \"Molecular basis for the proliferation/apoptosis imbalance not identified\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Determining that AMBRA1 physically tethers the BECLIN1-VPS34 complex to dynein via DLC1, and that ULK1 phosphorylation releases this complex for ER relocalization, resolved how autophagosome nucleation is spatially controlled and placed ULK1 upstream of AMBRA1.\",\n      \"evidence\": \"Reciprocal Co-IP, DLC1-binding site mutagenesis, ULK1 kinase assay, live-cell imaging\",\n      \"pmids\": [\"20921139\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"ULK1 phosphorylation sites on AMBRA1 not mapped\", \"Mechanism of ER membrane recruitment after dynein release unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showing that AMBRA1 binds preferentially to mitochondrial BCL-2 and competes with BCL-2 for BECLIN1 binding linked AMBRA1 to the BCL-2/BECLIN1 regulatory node, while the discovery of Parkin-dependent AMBRA1 recruitment to depolarized mitochondria established AMBRA1 as a mitophagy effector that activates class III PI3K locally.\",\n      \"evidence\": \"Subcellular fractionation with Co-IP (BCL-2 study); TAP-MS from HEK293/SH-SY5Y/mouse brain with reciprocal Co-IP and AMBRA1 siRNA mitophagy readout (Parkin study)\",\n      \"pmids\": [\"21358617\", \"21753002\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"BCL-2 binding site on AMBRA1 not mapped\", \"Direct mechanism by which AMBRA1 activates VPS34 at mitochondria unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstrating caspase cleavage at D482 and calpain-mediated degradation of AMBRA1 during apoptosis revealed that AMBRA1 destruction terminates pro-survival autophagy; this was extended in 2016 by showing the C-terminal cleavage fragment contains a BH3-like domain that directly inhibits BCL-2 to amplify apoptosis.\",\n      \"evidence\": \"In vitro cleavage assays, caspase non-cleavable mutant, BH3 domain mutagenesis with apoptosis readouts\",\n      \"pmids\": [\"22441670\", \"27123694\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance of the BH3-fragment proapoptotic loop not tested\", \"Calpain cleavage sites not precisely mapped\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Establishing that mTOR phosphorylates AMBRA1 to suppress autophagy, and that upon mTOR inhibition AMBRA1 recruits TRAF6 to K63-ubiquitylate and stabilize ULK1, defined a bistable positive feedback loop (ULK1→AMBRA1→TRAF6→ULK1) governing the autophagy on/off switch.\",\n      \"evidence\": \"Co-IP, K63-linkage-specific ubiquitylation assays, mTOR inhibition/activation, ULK1 kinase assays\",\n      \"pmids\": [\"23524951\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"mTOR phosphorylation sites on AMBRA1 not mapped\", \"Whether TRAF6 is the sole E3 for ULK1 K63-ubiquitylation not resolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Multiple 2014 discoveries expanded AMBRA1 beyond autophagy: CUL4 was shown to degrade AMBRA1 basally while AMBRA1 reciprocally inhibits CUL5 to stabilize DEPTOR; RNF2/WASH promotes K48-ubiquitylation of AMBRA1 at K45; and AMBRA1 recruits PP2A to dephosphorylate c-Myc, promoting its degradation and revealing AMBRA1 as a haploinsufficient tumor suppressor.\",\n      \"evidence\": \"Co-IP and ubiquitylation assays (CUL4/CUL5 and RNF2 studies); PP2A phosphatase assay, c-Myc stability assays, AMBRA1 KO tumor models (c-Myc study)\",\n      \"pmids\": [\"25499913\", \"24980959\", \"25438055\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"CUL4 binding site on AMBRA1 not structurally resolved at this stage\", \"CUL5 inhibition mechanism not fully dissected\", \"PP2A subunit specificity for AMBRA1-mediated c-Myc dephosphorylation undefined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"AMBRA1 was found to regulate spatial distribution of active Src kinase between focal adhesions and autophagic structures, controlling cancer cell invasion; separately, AMBRA1 was shown to bind phospho-S129 α-synuclein with ninefold higher affinity, with AMBRA1 loss causing α-synuclein aggregation in neurons.\",\n      \"evidence\": \"Interaction proteomics with Co-IP and live-cell phospho-Src imaging (Src study); Co-IP with binding affinity quantification and siRNA in primary neurons (α-synuclein study)\",\n      \"pmids\": [\"28362576\", \"27875637\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct Src phosphorylation sites relevant to AMBRA1 not mapped\", \"Whether AMBRA1-α-synuclein binding is direct or complex-mediated not resolved\", \"In vivo neurodegeneration relevance not tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Three discoveries in 2018 deepened the CRL4 and mitophagy axes: IKKα phosphorylation of AMBRA1 at S1014 enhances LC3/GABARAP binding for HUWE1-dependent mitophagy; MCL1 degradation by GSK-3β/HUWE1 licenses AMBRA1-dependent mitophagy; CRL4^AMBRA1 targets Elongin C for degradation to antagonize CRL5 complexes; and AMBRA1/PP2A stabilizes FOXO3 to drive FOXP3 transcription and Treg differentiation.\",\n      \"evidence\": \"In vitro kinase/phosphomimetic mutants with mitophagy readouts; proteomics-validated ubiquitination of Elongin C; PP2A activity assay with in vivo Treg models\",\n      \"pmids\": [\"30217973\", \"31434979\", \"30166453\", \"30513302\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full phosphorylation landscape of AMBRA1 during mitophagy not mapped\", \"Whether CRL4-AMBRA1 targets Elongin C constitutively or conditionally unclear\", \"PP2A holoenzyme composition in Treg context not specified\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"AMBRA1 was shown to scaffold TRIM32 to ULK1 in muscle cells, with TRIM32 activating ULK1 via K63-polyubiquitin chains; muscular dystrophy 2H mutations disrupt this interaction, linking AMBRA1 to disease-relevant autophagy regulation in skeletal muscle.\",\n      \"evidence\": \"In vitro ULK1 kinase assay, TRIM32 disease mutant analysis, autophagy flux in muscle cells\",\n      \"pmids\": [\"31234693\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct binding interface between AMBRA1 and TRIM32 not mapped\", \"Whether AMBRA1 loss alone recapitulates the TRIM32 muscular phenotype untested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"FRET-validated interaction of AMBRA1 with ERLIN1 at mitochondria-associated membranes (MAMs) showed that ganglioside GD3- and MFN2-dependent lipid raft-like microdomains provide a specific membrane platform for AMBRA1-dependent autophagosome formation.\",\n      \"evidence\": \"Co-IP, FRET analysis at MAMs, siRNA knockdown of ERLIN1/ST8SIA1/MFN2 with autophagy flux readout\",\n      \"pmids\": [\"33034545\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ERLIN1 binding is direct or via an intermediate not resolved\", \"Lipid composition requirements beyond GD3 not characterized\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"A breakthrough year established AMBRA1 as the D-type cyclin-degrading substrate receptor of CRL4: three simultaneous Nature papers showed CRL4^AMBRA1 ubiquitylates cyclin D1/D2/D3, cancer hotspot mutations escape this degradation, and AMBRA1 loss causes replication stress with CHK1 synthetic lethality; concurrently, AMBRA1 was shown to stabilize PINK1 at the OMM by counteracting ATAD3A-mediated import, to K63-ubiquitylate Smad4 for TGFβ signaling, and to stabilize MAVS for antiviral apoptosis.\",\n      \"evidence\": \"Genome-wide CRISPR screens, reconstituted ubiquitylation, in vivo mouse models (cyclin D papers); Co-IP at OMM fractions with epistasis analysis (PINK1); in vitro K63-ubiquitylation and metastasis models (Smad4); Co-IP and MAVS stability assays (MAVS)\",\n      \"pmids\": [\"33854235\", \"33854239\", \"33854232\", \"34798798\", \"34362797\", \"34859815\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of cyclin D recognition by AMBRA1 not yet resolved at this stage\", \"Whether Smad4 K63-ubiquitylation occurs genome-wide or at specific loci undefined\", \"MAVS stabilization mechanism awaits independent confirmation\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Muscle-specific AMBRA1 conditional knockout demonstrated in vivo that AMBRA1 is required for mitophagic flux in skeletal muscle, with its loss causing mitochondrial swelling, impaired DRP1/Parkin recruitment, and reduced oxidative fiber proportion.\",\n      \"evidence\": \"Conditional KO (Ambra1fl/fl:Mlc1f-Cre), electron microscopy, respiratory complex assay, AMBRA1 overexpression rescue\",\n      \"pmids\": [\"35593053\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether AMBRA1 acts through PINK1/PARKIN or HUWE1 pathway in muscle not resolved\", \"Contribution of autophagy-independent AMBRA1 functions to the muscle phenotype unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"The 3.08 Å cryo-EM structure of AMBRA1-DDB1 revealed that AMBRA1's N-terminal helix-loop-helix and WD40 domain engage DDB1's double-propeller, providing the first structural basis for CRL4^AMBRA1 assembly and cyclin D ubiquitylation; separately, CDK1/PLK1-dependent mitotic phosphorylation of AMBRA1 was shown to regulate NUMA1 localization and spindle orientation.\",\n      \"evidence\": \"Cryo-EM at 3.08 Å with HDX-MS and DDB1-binding mutants validated by ubiquitylation and cell cycle assays; in vitro CDK1/PLK1 kinase assays with phosphomutants and live-cell spindle imaging\",\n      \"pmids\": [\"37993427\", \"37584777\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structure with a cyclin D substrate bound\", \"Mitotic phosphosite identities and their individual contributions to spindle orientation not fully dissected\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"New regulatory inputs were defined: BAG2, a ULK1 complex effector, sequesters AMBRA1 until ULK1 phosphorylates BAG2 at S31 to release AMBRA1 for ER recruitment; independently, AMBRA1 was shown to sustain NF-κB signaling in an autophagy-independent manner by competitively blocking PP4R1/PP4c dephosphorylation of IKK, with IKKα phosphorylating AMBRA1 at S1043 to prevent its CUL4A-mediated degradation.\",\n      \"evidence\": \"AP-MS/proximity labeling with Co-IP and phosphomimetic BAG2 mutants (BAG2 study); in vitro phosphatase competition assay, AMBRA1 KO colitis model, S1043 phosphomimetic with ubiquitylation assay (NF-κB study)\",\n      \"pmids\": [\"39207901\", \"38424148\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"BAG2-AMBRA1 binding interface not structurally resolved\", \"Whether BAG2-dependent regulation is universal or cell-type-specific unclear\", \"Full IKK substrate landscape of AMBRA1 phosphorylation sites not mapped\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"USP7 was identified as the deubiquitinase stabilizing AMBRA1 at K83/K86 under oxidative stress; stabilized AMBRA1 suppresses NRF2 by competitively displacing DUB3 from NRF2's N-terminus, linking AMBRA1 to redox homeostasis control.\",\n      \"evidence\": \"In vitro deubiquitination assay, K83/K86 site mapping, domain mutagenesis (F1 domain), NRF2 stability assays, USP7 inhibitor in vivo\",\n      \"pmids\": [\"39887666\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether USP7-AMBRA1-NRF2 axis operates during autophagy or independently unclear\", \"In vivo relevance of NRF2 suppression by AMBRA1 in specific tissues not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Major open questions remain: no full-length AMBRA1 structure exists; the structural basis for cyclin D and other substrate recognition by CRL4^AMBRA1 is unresolved; the relative contributions of AMBRA1's autophagy-dependent versus autophagy-independent functions in tumorigenesis and inflammation need systematic dissection; and the complete phosphorylation code governing AMBRA1's switch between its multiple effector modes is unknown.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No full-length AMBRA1 structure\", \"Cyclin D substrate-bound CRL4 structure lacking\", \"Systematic separation of autophagy-dependent vs independent functions in vivo needed\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1, 5, 14, 15]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [6, 7, 16, 17, 26, 27]},\n      {\"term_id\": \"GO:0038024\", \"supporting_discovery_ids\": [16, 19, 23, 28]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [1, 15, 25]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [2, 3, 11, 18, 22]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1, 6, 25]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [0, 1, 2, 5, 6, 14, 15, 25]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [16, 17, 23, 24]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [4, 9, 30]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [6, 8, 16, 19, 23, 28]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [7, 12, 19, 26]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [12, 26, 28, 30]}\n    ],\n    \"complexes\": [\n      \"CRL4(DDB1-CUL4A)\",\n      \"BECLIN1-VPS34 autophagy initiation complex\",\n      \"ULK1 complex\"\n    ],\n    \"partners\": [\n      \"BECN1\",\n      \"DDB1\",\n      \"ULK1\",\n      \"TRAF6\",\n      \"PRKN\",\n      \"DLC1\",\n      \"PP2A\",\n      \"PINK1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}