{"gene":"ATAD1","run_date":"2026-04-28T17:12:37","timeline":{"discoveries":[{"year":2014,"finding":"Yeast Msp1 (ATAD1 ortholog) limits accumulation of mislocalized tail-anchored (TA) proteins (Pex15, Gos1) on the outer mitochondrial membrane when the GET pathway is disrupted; human ATAD1 similarly limits mitochondrial mislocalization of PEX26 and GOS28, establishing a conserved TA protein quality control function at mitochondria.","method":"Yeast deletion genetics, co-localization microscopy, Western blot in ATAD1 knockout mouse tissues","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — replicated in yeast and mammalian model with multiple orthogonal methods","pmids":["24843043"],"is_preprint":false},{"year":2014,"finding":"Msp1 (ATAD1 ortholog) localizes to the outer mitochondrial membrane and peroxisomes and promotes turnover of TA proteins (Pex15) misdirected to the OMM, acting as a local organelle surveillance factor that extracts mistargeted proteins.","method":"Yeast genetics, fluorescence microscopy, protein turnover assays with TA protein mutants","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — independent replication of TA protein extraction function, substrate binding and turnover demonstrated","pmids":["24821790"],"is_preprint":false},{"year":2017,"finding":"Msp1 (ATAD1 ortholog) is both necessary and sufficient to drive ATP-dependent extraction of TA proteins from the membrane; crystal structure of the cytosolic AAA+ domain modeled as a hexameric ring reveals a conserved membrane-facing surface adjacent to a central pore; pore-loop mutagenesis abolishes TA protein extraction in vitro and in yeast.","method":"Reconstitution of purified Msp1 in proteoliposomes, crystal structure, structure-guided mutagenesis, yeast complementation assay","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution, crystal structure, and mutagenesis in a single study","pmids":["28712723"],"is_preprint":false},{"year":2017,"finding":"Msp1 (ATAD1 ortholog) also resides on peroxisomes and clears excess TA proteins (Pex15) from the peroxisomal membrane; substrate selectivity is conferred by the Pex3-mediated 'shielding' of properly targeted Pex15, not by intrinsic Msp1 specificity; Msp1 selects substrates based on their solitary membrane existence.","method":"Live-cell quantitative fluorescence microscopy, drug-inducible gene expression, genetic interaction with Pex3","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods, kinetic modeling, genetic interaction assay","pmids":["28906250"],"is_preprint":false},{"year":2018,"finding":"ATAD1 (Thorase) controls postsynaptic AMPA receptor trafficking by disassembling GluA2–GRIP1 complexes; a frameshift mutation in ATAD1 (p.His357Argfs*15) alters oligomeric state and impairs GluA2 disassembly, reducing surface GluA2 in neurons and causing lethal encephalopathy in humans.","method":"Whole-exome sequencing, biochemical oligomerization assays, neuronal GluA2 surface imaging in ATAD1 knockout neurons expressing mutant Thorase","journal":"Brain : a journal of neurology","confidence":"High","confidence_rationale":"Tier 2 — human genetics linked to defined biochemical mechanism with cellular validation","pmids":["29390050"],"is_preprint":false},{"year":2019,"finding":"Msp1 (ATAD1 ortholog) recognizes mislocalized TA proteins through a dual-recognition mechanism: hydrophobic surfaces exposed in the cytoplasm are sensed by conserved hydrophobic residues in Msp1, while basic IMS-facing residues on substrates are recognized by the acidic D12 residue in Msp1's IMS domain; introducing a hydrophobic patch into mitochondrial TA proteins converts them into Msp1 substrates.","method":"In vivo genetic analysis in yeast, mutagenesis of Msp1 and substrate residues, identification of new substrates Frt1 and Ysy6","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 — multiple substrates tested, bidirectional mutagenesis with functional readouts","pmids":["30858337"],"is_preprint":false},{"year":2020,"finding":"Cryo-EM structures of Msp1–substrate complexes at near-atomic resolution show that Msp1 forms hexameric spirals translocating substrates through a central pore; a singular hydrophobic substrate recruitment site at the spiral seam positions substrate for pore entry; aromatic amino acids grip substrate via sequence-promiscuous hydrophobic interactions; intersubunit interfaces coordinate ATP hydrolysis with subunit position.","method":"Cryo-EM structure determination of Msp1-substrate complex","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 — near-atomic cryo-EM structure with mechanistic interpretation","pmids":["31999255"],"is_preprint":false},{"year":2020,"finding":"Msp1 (ATAD1 ortholog) is a processive, bidirectional protein translocase and robust unfoldase that threads diverse substrates through its central pore; ATPase activity and translocase activity depend on its hexameric state; Pex3 inhibits this unfoldase activity.","method":"In vitro translocase/unfoldase assays using hexamerization-scaffolded soluble Msp1, negative-stain electron microscopy","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with EM confirmation","pmids":["32541053"],"is_preprint":false},{"year":2017,"finding":"ATAD1 (Thorase) deficiency causes a neurologic disorder with hypertonia and seizures due to excessive AMPA receptor activity; AMPA receptor antagonist (perampanel) rescues behavioral defects, normalizes brain MRI, prevents seizures, and prolongs survival in Atad1 knockout mice, and improves hypertonicity and seizures in human patients.","method":"Atad1 knockout mouse behavioral/MRI phenotyping, perampanel pharmacological rescue in mice and human patients","journal":"Neurology. Genetics","confidence":"High","confidence_rationale":"Tier 2 — genetic model with defined pathway (AMPA receptor excess) and pharmacological validation in mice and humans","pmids":["28180185"],"is_preprint":false},{"year":2022,"finding":"Cryo-EM structures of human ATAD1 in complex with a peptide substrate reveal phylogenetically conserved structural elements including a C-terminal α-helix that strongly facilitates ATAD1 oligomerization (distinguishing it from close paralogs) and pore-loop 1 aromatic residues required for function that cannot be replaced by aliphatic residues; a live-cell microscopy assay confirmed ATAD1 activity in extracting mislocalized TA proteins.","method":"Cryo-EM structure determination, live-cell microscopy-based mislocalization assay, alanine/leucine mutagenesis of pore-loop aromatic residues","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 — near-atomic cryo-EM structure with mutagenesis and live-cell functional validation","pmids":["35550246"],"is_preprint":false},{"year":2022,"finding":"ATAD1 directly and specifically extracts the pro-apoptotic protein BIM from mitochondria to inactivate it; ATAD1 loss sensitizes cancer cells to proteasome inhibitors by allowing BIM accumulation and apoptosis; ATAD1 and PTEN are co-deleted at chromosome 10q23 in cancer.","method":"Direct pulldown/co-IP of BIM with ATAD1, ATAD1 KO cell lines and mouse xenograft models, proteasome inhibitor sensitivity assays","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 — direct substrate identification with KO phenotype in multiple models","pmids":["36409067"],"is_preprint":false},{"year":2024,"finding":"Human ATAD1 prevents clogging of the mitochondrial TOM (translocase of the outer membrane) complex by removing stalled import substrates; ATAD1 interacts with both TOM and stalled proteins; ATAD1 knockout leads to extensive accumulation of mitochondrial precursors and decreased protein import; increased ATAD1 expression improves fitness of cells with impaired mitochondrial protein import.","method":"Co-IP of ATAD1 with TOM complex and stalled substrates, ATAD1 knockout cell lines, mitochondrial protein import assays, precursor accumulation measurements","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — direct interaction with TOM, KO phenotype with import assays, multiple orthogonal methods","pmids":["39024102"],"is_preprint":false}],"current_model":"ATAD1 (and its yeast ortholog Msp1) is a hexameric, membrane-anchored AAA+ ATPase on the outer mitochondrial membrane that uses ATP hydrolysis to extract mislocalized tail-anchored membrane proteins and stalled TOM import substrates from the lipid bilayer via a central pore lined with aromatic residues, routing them for degradation or retargeting; in neurons, ATAD1 (Thorase) additionally disassembles GluA2–GRIP1 complexes to regulate AMPA receptor surface trafficking and synaptic plasticity, and it inactivates the pro-apoptotic protein BIM by extracting it from mitochondria."},"narrative":{"teleology":[{"year":2014,"claim":"The fundamental question of why certain tail-anchored proteins accumulate on mitochondria was answered by showing that ATAD1/Msp1 acts as a conserved surveillance factor that removes mislocalized TA proteins from the outer mitochondrial membrane when the GET targeting pathway fails.","evidence":"Yeast Msp1 deletion genetics with TA protein localization assays, validated in mammalian ATAD1 KO tissues; independently replicated in two concurrent studies","pmids":["24843043","24821790"],"confidence":"High","gaps":["Mechanism of extraction (direct vs. indirect) unresolved","Energy dependence not yet demonstrated in vitro","Substrate recognition determinants unknown"]},{"year":2017,"claim":"Whether Msp1/ATAD1 was sufficient for extraction and how it engaged substrates was resolved: reconstituted Msp1 alone drives ATP-dependent TA protein extraction through a hexameric ring, with pore-loop residues essential for activity; substrate selectivity on peroxisomes depends on Pex3-mediated shielding of correctly targeted proteins rather than intrinsic Msp1 specificity.","evidence":"Proteoliposome reconstitution, crystal structure of the AAA+ domain, pore-loop mutagenesis; quantitative live-cell imaging of Pex15 clearance with Pex3 genetic interactions","pmids":["28712723","28906250"],"confidence":"High","gaps":["No high-resolution substrate-engaged structure yet","Shielding mechanism not defined at molecular level","Human ATAD1 not yet reconstituted in vitro"]},{"year":2017,"claim":"The neuronal function of ATAD1 was established: ATAD1 disassembles GluA2–GRIP1 complexes to control AMPA receptor surface levels, and its loss causes lethal encephalopathy with seizures rescuable by AMPA receptor antagonism, linking TA protein extractase activity to synaptic physiology.","evidence":"Atad1 knockout mouse phenotyping with MRI and behavioral assays; perampanel rescue in mice and human patients","pmids":["28180185"],"confidence":"High","gaps":["Whether GRIP1 disassembly uses the same pore-threading mechanism as TA extraction is untested","No structure of ATAD1–GluA2–GRIP1 complex"]},{"year":2018,"claim":"Direct human genetic evidence tied a frameshift ATAD1 mutation to lethal encephalopathy, demonstrating that altered oligomerization and impaired GluA2 disassembly underlie the disease mechanism.","evidence":"Whole-exome sequencing of affected patients, oligomerization assays, neuronal surface GluA2 imaging with mutant Thorase","pmids":["29390050"],"confidence":"High","gaps":["Number of disease-causing alleles limited; genotype-phenotype spectrum undefined","Impact of this mutation on TA protein extraction function untested"]},{"year":2019,"claim":"How Msp1/ATAD1 distinguishes mislocalized from correctly targeted substrates was clarified: a dual-recognition mechanism senses cytoplasm-exposed hydrophobic patches and IMS-facing basic residues on substrates, with a conserved acidic residue (D12) in the IMS domain critical for recognition.","evidence":"Bidirectional mutagenesis of Msp1 and substrates in yeast, identification of new substrates Frt1 and Ysy6","pmids":["30858337"],"confidence":"High","gaps":["No structural view of the IMS recognition interface","Whether human ATAD1 uses identical recognition determinants not directly tested"]},{"year":2020,"claim":"Near-atomic cryo-EM structures revealed how Msp1 translocates substrates: hexameric spirals grip substrate via sequence-promiscuous hydrophobic pore-loop interactions and a unique seam-site recruitment mechanism, while in vitro assays showed processive bidirectional translocase and robust unfoldase activity inhibitable by Pex3.","evidence":"Cryo-EM of Msp1–substrate complex; in vitro translocase/unfoldase assays with scaffolded soluble Msp1","pmids":["31999255","32541053"],"confidence":"High","gaps":["Translocation directionality in the membrane context unclear","Coupling between ATP hydrolysis cycle and sequential subunit stepping not fully resolved"]},{"year":2022,"claim":"Human ATAD1 cryo-EM structures established conserved pore-loop architecture with essential aromatic residues and identified a C-terminal α-helix that drives oligomerization, distinguishing ATAD1 from paralogs; concurrently, BIM was identified as a direct ATAD1 substrate whose extraction from mitochondria suppresses apoptosis, creating a druggable vulnerability in ATAD1-deleted cancers.","evidence":"Cryo-EM of human ATAD1, pore-loop mutagenesis with live-cell TA extraction assay; ATAD1 KO cell lines and xenograft models with proteasome inhibitor sensitivity","pmids":["35550246","36409067"],"confidence":"High","gaps":["Whether BIM extraction occurs through the same pore mechanism as TA proteins is assumed but not structurally shown","Clinical relevance of ATAD1/PTEN co-deletion as a therapeutic biomarker requires validation"]},{"year":2024,"claim":"A new function beyond TA quality control was established: ATAD1 prevents clogging of the TOM import channel by extracting stalled precursor proteins, maintaining mitochondrial protein import homeostasis.","evidence":"Co-IP of ATAD1 with TOM complex and stalled substrates, ATAD1 KO precursor accumulation, import rescue by ATAD1 overexpression","pmids":["39024102"],"confidence":"High","gaps":["Whether ATAD1 acts directly on the TOM channel or on substrates after release is not resolved","Structural basis of ATAD1–TOM interaction unknown","Relative contribution of TA extraction vs. TOM clearance to mitochondrial fitness not quantified"]},{"year":null,"claim":"How ATAD1's distinct substrate classes (TA proteins, BIM, TOM-stalled precursors, GluA2–GRIP1 complexes) are prioritized or regulated in different cell types, and whether a unified pore-threading mechanism accounts for all activities, remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No structural view of ATAD1 engaging a full-length membrane-embedded substrate in a native lipid bilayer","Regulatory mechanisms controlling ATAD1 activity (post-translational modifications, tissue-specific cofactors) are uncharacterized","Relationship between neuronal GluA2 disassembly and mitochondrial extractase activity not mechanistically reconciled"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[2,6,7,9]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[2,7,10,11]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[2,7]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,1,2,10,11]},{"term_id":"GO:0005777","term_label":"peroxisome","supporting_discovery_ids":[1,3]}],"pathway":[{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[0,1,3,11]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,1,2,11]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[10]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[4,8]}],"complexes":[],"partners":["GLUA2","GRIP1","BIM","TOM","PEX3","PEX26"],"other_free_text":[]},"mechanistic_narrative":"ATAD1 is a membrane-anchored AAA+ ATPase that functions as a protein quality control extractase on the outer mitochondrial membrane and peroxisomes, removing mislocalized tail-anchored proteins, stalled TOM import substrates, and the pro-apoptotic factor BIM from lipid bilayers in an ATP-dependent manner. Structural studies of ATAD1 and its yeast ortholog Msp1 show it assembles into hexameric spirals that thread substrates through a central pore lined with essential aromatic residues, acting as a processive, bidirectional translocase and unfoldase whose substrate selectivity is governed by exposed hydrophobic surfaces and partner-mediated shielding rather than intrinsic sequence specificity [PMID:28712723, PMID:31999255, PMID:35550246, PMID:30858337]. Beyond organelle surveillance, ATAD1 extracts stalled precursors from the TOM complex to maintain mitochondrial protein import capacity and removes BIM from mitochondria to suppress apoptosis [PMID:39024102, PMID:36409067]. In neurons, ATAD1 disassembles GluA2–GRIP1 complexes to regulate AMPA receptor surface trafficking and synaptic plasticity, and loss-of-function mutations cause lethal encephalopathy with seizures and hypertonia that is ameliorated by AMPA receptor antagonism [PMID:29390050, PMID:28180185]."},"prefetch_data":{"uniprot":{"accession":"Q8NBU5","full_name":"Outer mitochondrial transmembrane helix translocase","aliases":["ATPase family AAA domain-containing protein 1","hATAD1","Thorase"],"length_aa":361,"mass_kda":40.7,"function":"Outer mitochondrial translocase required to remove mislocalized tail-anchored transmembrane proteins on mitochondria (PubMed:24843043). Specifically recognizes and binds tail-anchored transmembrane proteins: acts as a dislocase that mediates the ATP-dependent extraction of mistargeted tail-anchored transmembrane proteins from the mitochondrion outer membrane (By similarity). Also plays a critical role in regulating the surface expression of AMPA receptors (AMPAR), thereby regulating synaptic plasticity and learning and memory (By similarity). Required for NMDA-stimulated AMPAR internalization and inhibition of GRIA1 and GRIA2 recycling back to the plasma membrane; these activities are ATPase-dependent (By similarity)","subcellular_location":"Mitochondrion outer membrane; Peroxisome membrane; Postsynaptic cell membrane","url":"https://www.uniprot.org/uniprotkb/Q8NBU5/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ATAD1","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"METAP2","stoichiometry":0.2},{"gene":"NFKB1","stoichiometry":0.2},{"gene":"RELA","stoichiometry":0.2},{"gene":"SYAP1","stoichiometry":0.2},{"gene":"TPT1","stoichiometry":0.2},{"gene":"VDAC1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/ATAD1","total_profiled":1310},"omim":[{"mim_id":"618011","title":"HYPEREKPLEXIA 4; HKPX4","url":"https://www.omim.org/entry/618011"},{"mim_id":"614452","title":"ATPase FAMILY, AAA DOMAIN-CONTAINING, MEMBER 1; ATAD1","url":"https://www.omim.org/entry/614452"},{"mim_id":"149400","title":"HYPEREKPLEXIA 1; HKPX1","url":"https://www.omim.org/entry/149400"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoli rim","reliability":"Approved"},{"location":"Mitochondria","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/ATAD1"},"hgnc":{"alias_symbol":["FLJ14600","Msp1"],"prev_symbol":[]},"alphafold":{"accession":"Q8NBU5","domains":[{"cath_id":"3.40.50.300","chopping":"68-255","consensus_level":"high","plddt":86.4085,"start":68,"end":255},{"cath_id":"1.10.8.60","chopping":"261-318_328-353","consensus_level":"high","plddt":92.9644,"start":261,"end":353}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NBU5","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NBU5-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NBU5-F1-predicted_aligned_error_v6.png","plddt_mean":84.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ATAD1","jax_strain_url":"https://www.jax.org/strain/search?query=ATAD1"},"sequence":{"accession":"Q8NBU5","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8NBU5.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8NBU5/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NBU5"}},"corpus_meta":[{"pmid":"8515771","id":"PMC_8515771","title":"Analysis 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(ATAD1 ortholog) limits accumulation of mislocalized tail-anchored (TA) proteins (Pex15, Gos1) on the outer mitochondrial membrane when the GET pathway is disrupted; human ATAD1 similarly limits mitochondrial mislocalization of PEX26 and GOS28, establishing a conserved TA protein quality control function at mitochondria.\",\n      \"method\": \"Yeast deletion genetics, co-localization microscopy, Western blot in ATAD1 knockout mouse tissues\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — replicated in yeast and mammalian model with multiple orthogonal methods\",\n      \"pmids\": [\"24843043\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Msp1 (ATAD1 ortholog) localizes to the outer mitochondrial membrane and peroxisomes and promotes turnover of TA proteins (Pex15) misdirected to the OMM, acting as a local organelle surveillance factor that extracts mistargeted proteins.\",\n      \"method\": \"Yeast genetics, fluorescence microscopy, protein turnover assays with TA protein mutants\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — independent replication of TA protein extraction function, substrate binding and turnover demonstrated\",\n      \"pmids\": [\"24821790\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Msp1 (ATAD1 ortholog) is both necessary and sufficient to drive ATP-dependent extraction of TA proteins from the membrane; crystal structure of the cytosolic AAA+ domain modeled as a hexameric ring reveals a conserved membrane-facing surface adjacent to a central pore; pore-loop mutagenesis abolishes TA protein extraction in vitro and in yeast.\",\n      \"method\": \"Reconstitution of purified Msp1 in proteoliposomes, crystal structure, structure-guided mutagenesis, yeast complementation assay\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution, crystal structure, and mutagenesis in a single study\",\n      \"pmids\": [\"28712723\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Msp1 (ATAD1 ortholog) also resides on peroxisomes and clears excess TA proteins (Pex15) from the peroxisomal membrane; substrate selectivity is conferred by the Pex3-mediated 'shielding' of properly targeted Pex15, not by intrinsic Msp1 specificity; Msp1 selects substrates based on their solitary membrane existence.\",\n      \"method\": \"Live-cell quantitative fluorescence microscopy, drug-inducible gene expression, genetic interaction with Pex3\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods, kinetic modeling, genetic interaction assay\",\n      \"pmids\": [\"28906250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ATAD1 (Thorase) controls postsynaptic AMPA receptor trafficking by disassembling GluA2–GRIP1 complexes; a frameshift mutation in ATAD1 (p.His357Argfs*15) alters oligomeric state and impairs GluA2 disassembly, reducing surface GluA2 in neurons and causing lethal encephalopathy in humans.\",\n      \"method\": \"Whole-exome sequencing, biochemical oligomerization assays, neuronal GluA2 surface imaging in ATAD1 knockout neurons expressing mutant Thorase\",\n      \"journal\": \"Brain : a journal of neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — human genetics linked to defined biochemical mechanism with cellular validation\",\n      \"pmids\": [\"29390050\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Msp1 (ATAD1 ortholog) recognizes mislocalized TA proteins through a dual-recognition mechanism: hydrophobic surfaces exposed in the cytoplasm are sensed by conserved hydrophobic residues in Msp1, while basic IMS-facing residues on substrates are recognized by the acidic D12 residue in Msp1's IMS domain; introducing a hydrophobic patch into mitochondrial TA proteins converts them into Msp1 substrates.\",\n      \"method\": \"In vivo genetic analysis in yeast, mutagenesis of Msp1 and substrate residues, identification of new substrates Frt1 and Ysy6\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple substrates tested, bidirectional mutagenesis with functional readouts\",\n      \"pmids\": [\"30858337\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Cryo-EM structures of Msp1–substrate complexes at near-atomic resolution show that Msp1 forms hexameric spirals translocating substrates through a central pore; a singular hydrophobic substrate recruitment site at the spiral seam positions substrate for pore entry; aromatic amino acids grip substrate via sequence-promiscuous hydrophobic interactions; intersubunit interfaces coordinate ATP hydrolysis with subunit position.\",\n      \"method\": \"Cryo-EM structure determination of Msp1-substrate complex\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — near-atomic cryo-EM structure with mechanistic interpretation\",\n      \"pmids\": [\"31999255\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Msp1 (ATAD1 ortholog) is a processive, bidirectional protein translocase and robust unfoldase that threads diverse substrates through its central pore; ATPase activity and translocase activity depend on its hexameric state; Pex3 inhibits this unfoldase activity.\",\n      \"method\": \"In vitro translocase/unfoldase assays using hexamerization-scaffolded soluble Msp1, negative-stain electron microscopy\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with EM confirmation\",\n      \"pmids\": [\"32541053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ATAD1 (Thorase) deficiency causes a neurologic disorder with hypertonia and seizures due to excessive AMPA receptor activity; AMPA receptor antagonist (perampanel) rescues behavioral defects, normalizes brain MRI, prevents seizures, and prolongs survival in Atad1 knockout mice, and improves hypertonicity and seizures in human patients.\",\n      \"method\": \"Atad1 knockout mouse behavioral/MRI phenotyping, perampanel pharmacological rescue in mice and human patients\",\n      \"journal\": \"Neurology. Genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic model with defined pathway (AMPA receptor excess) and pharmacological validation in mice and humans\",\n      \"pmids\": [\"28180185\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Cryo-EM structures of human ATAD1 in complex with a peptide substrate reveal phylogenetically conserved structural elements including a C-terminal α-helix that strongly facilitates ATAD1 oligomerization (distinguishing it from close paralogs) and pore-loop 1 aromatic residues required for function that cannot be replaced by aliphatic residues; a live-cell microscopy assay confirmed ATAD1 activity in extracting mislocalized TA proteins.\",\n      \"method\": \"Cryo-EM structure determination, live-cell microscopy-based mislocalization assay, alanine/leucine mutagenesis of pore-loop aromatic residues\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — near-atomic cryo-EM structure with mutagenesis and live-cell functional validation\",\n      \"pmids\": [\"35550246\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ATAD1 directly and specifically extracts the pro-apoptotic protein BIM from mitochondria to inactivate it; ATAD1 loss sensitizes cancer cells to proteasome inhibitors by allowing BIM accumulation and apoptosis; ATAD1 and PTEN are co-deleted at chromosome 10q23 in cancer.\",\n      \"method\": \"Direct pulldown/co-IP of BIM with ATAD1, ATAD1 KO cell lines and mouse xenograft models, proteasome inhibitor sensitivity assays\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct substrate identification with KO phenotype in multiple models\",\n      \"pmids\": [\"36409067\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Human ATAD1 prevents clogging of the mitochondrial TOM (translocase of the outer membrane) complex by removing stalled import substrates; ATAD1 interacts with both TOM and stalled proteins; ATAD1 knockout leads to extensive accumulation of mitochondrial precursors and decreased protein import; increased ATAD1 expression improves fitness of cells with impaired mitochondrial protein import.\",\n      \"method\": \"Co-IP of ATAD1 with TOM complex and stalled substrates, ATAD1 knockout cell lines, mitochondrial protein import assays, precursor accumulation measurements\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct interaction with TOM, KO phenotype with import assays, multiple orthogonal methods\",\n      \"pmids\": [\"39024102\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ATAD1 (and its yeast ortholog Msp1) is a hexameric, membrane-anchored AAA+ ATPase on the outer mitochondrial membrane that uses ATP hydrolysis to extract mislocalized tail-anchored membrane proteins and stalled TOM import substrates from the lipid bilayer via a central pore lined with aromatic residues, routing them for degradation or retargeting; in neurons, ATAD1 (Thorase) additionally disassembles GluA2–GRIP1 complexes to regulate AMPA receptor surface trafficking and synaptic plasticity, and it inactivates the pro-apoptotic protein BIM by extracting it from mitochondria.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"ATAD1 is a membrane-anchored AAA+ ATPase that functions as a protein quality control extractase on the outer mitochondrial membrane and peroxisomes, removing mislocalized tail-anchored proteins, stalled TOM import substrates, and the pro-apoptotic factor BIM from lipid bilayers in an ATP-dependent manner. Structural studies of ATAD1 and its yeast ortholog Msp1 show it assembles into hexameric spirals that thread substrates through a central pore lined with essential aromatic residues, acting as a processive, bidirectional translocase and unfoldase whose substrate selectivity is governed by exposed hydrophobic surfaces and partner-mediated shielding rather than intrinsic sequence specificity [PMID:28712723, PMID:31999255, PMID:35550246, PMID:30858337]. Beyond organelle surveillance, ATAD1 extracts stalled precursors from the TOM complex to maintain mitochondrial protein import capacity and removes BIM from mitochondria to suppress apoptosis [PMID:39024102, PMID:36409067]. In neurons, ATAD1 disassembles GluA2–GRIP1 complexes to regulate AMPA receptor surface trafficking and synaptic plasticity, and loss-of-function mutations cause lethal encephalopathy with seizures and hypertonia that is ameliorated by AMPA receptor antagonism [PMID:29390050, PMID:28180185].\",\n  \"teleology\": [\n    {\n      \"year\": 2014,\n      \"claim\": \"The fundamental question of why certain tail-anchored proteins accumulate on mitochondria was answered by showing that ATAD1/Msp1 acts as a conserved surveillance factor that removes mislocalized TA proteins from the outer mitochondrial membrane when the GET targeting pathway fails.\",\n      \"evidence\": \"Yeast Msp1 deletion genetics with TA protein localization assays, validated in mammalian ATAD1 KO tissues; independently replicated in two concurrent studies\",\n      \"pmids\": [\"24843043\", \"24821790\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of extraction (direct vs. indirect) unresolved\", \"Energy dependence not yet demonstrated in vitro\", \"Substrate recognition determinants unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Whether Msp1/ATAD1 was sufficient for extraction and how it engaged substrates was resolved: reconstituted Msp1 alone drives ATP-dependent TA protein extraction through a hexameric ring, with pore-loop residues essential for activity; substrate selectivity on peroxisomes depends on Pex3-mediated shielding of correctly targeted proteins rather than intrinsic Msp1 specificity.\",\n      \"evidence\": \"Proteoliposome reconstitution, crystal structure of the AAA+ domain, pore-loop mutagenesis; quantitative live-cell imaging of Pex15 clearance with Pex3 genetic interactions\",\n      \"pmids\": [\"28712723\", \"28906250\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No high-resolution substrate-engaged structure yet\", \"Shielding mechanism not defined at molecular level\", \"Human ATAD1 not yet reconstituted in vitro\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"The neuronal function of ATAD1 was established: ATAD1 disassembles GluA2–GRIP1 complexes to control AMPA receptor surface levels, and its loss causes lethal encephalopathy with seizures rescuable by AMPA receptor antagonism, linking TA protein extractase activity to synaptic physiology.\",\n      \"evidence\": \"Atad1 knockout mouse phenotyping with MRI and behavioral assays; perampanel rescue in mice and human patients\",\n      \"pmids\": [\"28180185\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether GRIP1 disassembly uses the same pore-threading mechanism as TA extraction is untested\", \"No structure of ATAD1–GluA2–GRIP1 complex\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Direct human genetic evidence tied a frameshift ATAD1 mutation to lethal encephalopathy, demonstrating that altered oligomerization and impaired GluA2 disassembly underlie the disease mechanism.\",\n      \"evidence\": \"Whole-exome sequencing of affected patients, oligomerization assays, neuronal surface GluA2 imaging with mutant Thorase\",\n      \"pmids\": [\"29390050\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Number of disease-causing alleles limited; genotype-phenotype spectrum undefined\", \"Impact of this mutation on TA protein extraction function untested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"How Msp1/ATAD1 distinguishes mislocalized from correctly targeted substrates was clarified: a dual-recognition mechanism senses cytoplasm-exposed hydrophobic patches and IMS-facing basic residues on substrates, with a conserved acidic residue (D12) in the IMS domain critical for recognition.\",\n      \"evidence\": \"Bidirectional mutagenesis of Msp1 and substrates in yeast, identification of new substrates Frt1 and Ysy6\",\n      \"pmids\": [\"30858337\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural view of the IMS recognition interface\", \"Whether human ATAD1 uses identical recognition determinants not directly tested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Near-atomic cryo-EM structures revealed how Msp1 translocates substrates: hexameric spirals grip substrate via sequence-promiscuous hydrophobic pore-loop interactions and a unique seam-site recruitment mechanism, while in vitro assays showed processive bidirectional translocase and robust unfoldase activity inhibitable by Pex3.\",\n      \"evidence\": \"Cryo-EM of Msp1–substrate complex; in vitro translocase/unfoldase assays with scaffolded soluble Msp1\",\n      \"pmids\": [\"31999255\", \"32541053\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Translocation directionality in the membrane context unclear\", \"Coupling between ATP hydrolysis cycle and sequential subunit stepping not fully resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Human ATAD1 cryo-EM structures established conserved pore-loop architecture with essential aromatic residues and identified a C-terminal α-helix that drives oligomerization, distinguishing ATAD1 from paralogs; concurrently, BIM was identified as a direct ATAD1 substrate whose extraction from mitochondria suppresses apoptosis, creating a druggable vulnerability in ATAD1-deleted cancers.\",\n      \"evidence\": \"Cryo-EM of human ATAD1, pore-loop mutagenesis with live-cell TA extraction assay; ATAD1 KO cell lines and xenograft models with proteasome inhibitor sensitivity\",\n      \"pmids\": [\"35550246\", \"36409067\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether BIM extraction occurs through the same pore mechanism as TA proteins is assumed but not structurally shown\", \"Clinical relevance of ATAD1/PTEN co-deletion as a therapeutic biomarker requires validation\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"A new function beyond TA quality control was established: ATAD1 prevents clogging of the TOM import channel by extracting stalled precursor proteins, maintaining mitochondrial protein import homeostasis.\",\n      \"evidence\": \"Co-IP of ATAD1 with TOM complex and stalled substrates, ATAD1 KO precursor accumulation, import rescue by ATAD1 overexpression\",\n      \"pmids\": [\"39024102\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ATAD1 acts directly on the TOM channel or on substrates after release is not resolved\", \"Structural basis of ATAD1–TOM interaction unknown\", \"Relative contribution of TA extraction vs. TOM clearance to mitochondrial fitness not quantified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How ATAD1's distinct substrate classes (TA proteins, BIM, TOM-stalled precursors, GluA2–GRIP1 complexes) are prioritized or regulated in different cell types, and whether a unified pore-threading mechanism accounts for all activities, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural view of ATAD1 engaging a full-length membrane-embedded substrate in a native lipid bilayer\", \"Regulatory mechanisms controlling ATAD1 activity (post-translational modifications, tissue-specific cofactors) are uncharacterized\", \"Relationship between neuronal GluA2 disassembly and mitochondrial extractase activity not mechanistically reconciled\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [2, 6, 7, 9]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [2, 7, 10, 11]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [2, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 1, 2, 10, 11]},\n      {\"term_id\": \"GO:0005777\", \"supporting_discovery_ids\": [1, 3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": []},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [0, 1, 3, 11]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 1, 2, 11]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [10]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [4, 8]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"GluA2\", \"GRIP1\", \"BIM\", \"TOM\", \"Pex3\", \"PEX26\"],\n    \"other_free_text\": []\n  }\n}\n```\n\nWait, I made an error with a stray GO:0005886 in pathways. Let me fix that:\n\n```json\n{\n  \"mechanistic_narrative\": \"ATAD1 is a membrane-anchored AAA+ ATPase that functions as a protein quality control extractase on the outer mitochondrial membrane and peroxisomes, removing mislocalized tail-anchored proteins, stalled TOM import substrates, and the pro-apoptotic factor BIM from lipid bilayers in an ATP-dependent manner. Structural studies of ATAD1 and its yeast ortholog Msp1 show it assembles into hexameric spirals that thread substrates through a central pore lined with essential aromatic residues, acting as a processive, bidirectional translocase and unfoldase whose substrate selectivity is governed by exposed hydrophobic surfaces and partner-mediated shielding rather than intrinsic sequence specificity [PMID:28712723, PMID:31999255, PMID:35550246, PMID:30858337]. Beyond organelle surveillance, ATAD1 extracts stalled precursors from the TOM complex to maintain mitochondrial protein import capacity and removes BIM from mitochondria to suppress apoptosis [PMID:39024102, PMID:36409067]. In neurons, ATAD1 disassembles GluA2–GRIP1 complexes to regulate AMPA receptor surface trafficking and synaptic plasticity, and loss-of-function mutations cause lethal encephalopathy with seizures and hypertonia that is ameliorated by AMPA receptor antagonism [PMID:29390050, PMID:28180185].\",\n  \"teleology\": [\n    {\n      \"year\": 2014,\n      \"claim\": \"The fundamental question of why certain tail-anchored proteins accumulate on mitochondria was answered by showing that ATAD1/Msp1 acts as a conserved surveillance factor that removes mislocalized TA proteins from the outer mitochondrial membrane when the GET targeting pathway fails.\",\n      \"evidence\": \"Yeast Msp1 deletion genetics with TA protein localization assays, validated in mammalian ATAD1 KO tissues; independently replicated in two concurrent studies\",\n      \"pmids\": [\"24843043\", \"24821790\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of extraction (direct vs. indirect) unresolved\", \"Energy dependence not yet demonstrated in vitro\", \"Substrate recognition determinants unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Whether Msp1/ATAD1 was sufficient for extraction and how it engaged substrates was resolved: reconstituted Msp1 alone drives ATP-dependent TA protein extraction through a hexameric ring, with pore-loop residues essential for activity; substrate selectivity on peroxisomes depends on Pex3-mediated shielding of correctly targeted proteins rather than intrinsic Msp1 specificity.\",\n      \"evidence\": \"Proteoliposome reconstitution, crystal structure of the AAA+ domain, pore-loop mutagenesis; quantitative live-cell imaging of Pex15 clearance with Pex3 genetic interactions\",\n      \"pmids\": [\"28712723\", \"28906250\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No high-resolution substrate-engaged structure yet\", \"Shielding mechanism not defined at molecular level\", \"Human ATAD1 not yet reconstituted in vitro\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"The neuronal function of ATAD1 was established: ATAD1 disassembles GluA2–GRIP1 complexes to control AMPA receptor surface levels, and its loss causes lethal encephalopathy with seizures rescuable by AMPA receptor antagonism, linking TA protein extractase activity to synaptic physiology.\",\n      \"evidence\": \"Atad1 knockout mouse phenotyping with MRI and behavioral assays; perampanel rescue in mice and human patients\",\n      \"pmids\": [\"28180185\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether GRIP1 disassembly uses the same pore-threading mechanism as TA extraction is untested\", \"No structure of ATAD1–GluA2–GRIP1 complex\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Direct human genetic evidence tied a frameshift ATAD1 mutation to lethal encephalopathy, demonstrating that altered oligomerization and impaired GluA2 disassembly underlie the disease mechanism.\",\n      \"evidence\": \"Whole-exome sequencing of affected patients, oligomerization assays, neuronal surface GluA2 imaging with mutant Thorase\",\n      \"pmids\": [\"29390050\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Number of disease-causing alleles limited; genotype-phenotype spectrum undefined\", \"Impact of this mutation on TA protein extraction function untested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"How Msp1/ATAD1 distinguishes mislocalized from correctly targeted substrates was clarified: a dual-recognition mechanism senses cytoplasm-exposed hydrophobic patches and IMS-facing basic residues on substrates, with a conserved acidic residue (D12) in the IMS domain critical for recognition.\",\n      \"evidence\": \"Bidirectional mutagenesis of Msp1 and substrates in yeast, identification of new substrates Frt1 and Ysy6\",\n      \"pmids\": [\"30858337\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural view of the IMS recognition interface\", \"Whether human ATAD1 uses identical recognition determinants not directly tested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Near-atomic cryo-EM structures revealed how Msp1 translocates substrates: hexameric spirals grip substrate via sequence-promiscuous hydrophobic pore-loop interactions and a unique seam-site recruitment mechanism, while in vitro assays showed processive bidirectional translocase and robust unfoldase activity inhibitable by Pex3.\",\n      \"evidence\": \"Cryo-EM of Msp1–substrate complex; in vitro translocase/unfoldase assays with scaffolded soluble Msp1\",\n      \"pmids\": [\"31999255\", \"32541053\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Translocation directionality in the membrane context unclear\", \"Coupling between ATP hydrolysis cycle and sequential subunit stepping not fully resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Human ATAD1 cryo-EM structures established conserved pore-loop architecture with essential aromatic residues and identified a C-terminal α-helix that drives oligomerization, distinguishing ATAD1 from paralogs; concurrently, BIM was identified as a direct ATAD1 substrate whose extraction from mitochondria suppresses apoptosis, creating a druggable vulnerability in ATAD1-deleted cancers.\",\n      \"evidence\": \"Cryo-EM of human ATAD1, pore-loop mutagenesis with live-cell TA extraction assay; ATAD1 KO cell lines and xenograft models with proteasome inhibitor sensitivity\",\n      \"pmids\": [\"35550246\", \"36409067\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether BIM extraction occurs through the same pore mechanism as TA proteins is assumed but not structurally shown\", \"Clinical relevance of ATAD1/PTEN co-deletion as a therapeutic biomarker requires validation\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"A new function beyond TA quality control was established: ATAD1 prevents clogging of the TOM import channel by extracting stalled precursor proteins, maintaining mitochondrial protein import homeostasis.\",\n      \"evidence\": \"Co-IP of ATAD1 with TOM complex and stalled substrates, ATAD1 KO precursor accumulation, import rescue by ATAD1 overexpression\",\n      \"pmids\": [\"39024102\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ATAD1 acts directly on the TOM channel or on substrates after release is not resolved\", \"Structural basis of ATAD1–TOM interaction unknown\", \"Relative contribution of TA extraction vs. TOM clearance to mitochondrial fitness not quantified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How ATAD1's distinct substrate classes (TA proteins, BIM, TOM-stalled precursors, GluA2–GRIP1 complexes) are prioritized or regulated in different cell types, and whether a unified pore-threading mechanism accounts for all activities, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural view of ATAD1 engaging a full-length membrane-embedded substrate in a native lipid bilayer\", \"Regulatory mechanisms controlling ATAD1 activity (post-translational modifications, tissue-specific cofactors) are uncharacterized\", \"Relationship between neuronal GluA2 disassembly and mitochondrial extractase activity not mechanistically reconciled\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [2, 6, 7, 9]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [2, 7, 10, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 1, 2, 10, 11]},\n      {\"term_id\": \"GO:0005777\", \"supporting_discovery_ids\": [1, 3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [0, 1, 3, 11]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 1, 2, 11]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [10]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [4, 8]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"GluA2\", \"GRIP1\", \"BIM\", \"TOM\", \"Pex3\", \"PEX26\"],\n    \"other_free_text\": []\n  }\n}\n```"}