{"gene":"NDUFA11","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2002,"finding":"NDUFA11 (B14.7) was identified as a novel nuclear-encoded subunit of bovine heart mitochondrial complex I, located in subcomplex Ialpha. The protein has an acetylated N terminus, no presequence, contains four potential transmembrane helices, and is homologous to Tim17/Tim22/Tim23 protein translocation components of the inner mitochondrial membrane.","method":"Reverse-phase HPLC, 1D and 2D gel electrophoresis, tryptic peptide mass fingerprinting, tandem mass spectrometry, cDNA cloning and sequencing","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct biochemical identification by multiple orthogonal MS methods and cDNA confirmation; replicated in subsequent study (PMID:12644575)","pmids":["12381726"],"is_preprint":false},{"year":2003,"finding":"NDUFA11 (B14.7) was confirmed as a subunit of bovine heart complex I found in subcomplexes Ilambda and Ibeta, establishing that the intact complex I contains 46 subunits with a mass of ~980 kDa. B14.7 was detected specifically in subcomplex Ilambda by SDS-PAGE and in subcomplex Ibeta by HPLC analysis.","method":"1D SDS-PAGE, 2D isoelectric focusing/SDS-PAGE, reverse-phase HPLC, tryptic peptide mass fingerprinting, tandem mass spectrometry, electrospray ionization MS","journal":"Molecular & cellular proteomics : MCP","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal biochemical methods on purified complex, replicating and extending PMID:12381726","pmids":["12644575"],"is_preprint":false},{"year":2013,"finding":"Suppression of NDUFA11 expression disrupted assembly of complex I, causing accumulation of subcomplexes at ~550 kDa and ~815 kDa, and was associated with eight known extrinsic assembly factors plus the hydrophobic protein C3orf1 in these subcomplexes. This establishes NDUFA11 as required for constructing the membrane arm of complex I.","method":"siRNA knockdown, blue-native PAGE to detect subcomplexes, mass spectrometry of associated assembly factors","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean knockdown with defined biochemical phenotype (subcomplex accumulation) and identification of associated assembly factors by MS; single lab but multiple orthogonal methods","pmids":["24191001"],"is_preprint":false},{"year":2008,"finding":"A splice-site mutation in NDUFA11 causing loss of the first transmembrane domain destabilizes complex I and causes mitochondrial complex I deficiency, manifesting as encephalocardiomyopathy or fatal infantile lactic acidemia in human patients.","method":"Homozygosity mapping, mutation analysis, patient biochemical studies","journal":"Annals of neurology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — human genetic loss-of-function with defined enzymatic deficiency; mechanism inferred from predicted domain loss, not directly reconstituted","pmids":["18306244"],"is_preprint":false},{"year":2016,"finding":"Cryo-EM structure of the porcine respiratory supercomplex I1III2IV1 at 4.0 Å showed that NDUFA11 is directly positioned at the interface between complex I and the other complexes, contributing to the oligomerization of CI, CIII, and CIV within the supercomplex.","method":"Cryo-electron microscopy at 4.0 Å resolution, structural assignment of individual subunits","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — near-atomic resolution cryo-EM structure with direct subunit placement; published in high-impact journal with rigorous structural validation","pmids":["27912063"],"is_preprint":false},{"year":2018,"finding":"Knockdown of NDUFA11 in cardioblast cells and cardiac mitochondria caused dissociation of the respirasome (CI-CIII-CIV supercomplex), reduced activities of complexes I, III, and IV, decreased ATP production, and increased mitochondrial ROS production, establishing NDUFA11 as essential for respirasome assembly and stability.","method":"siRNA knockdown, blue-native PAGE, enzyme activity assays for complexes I/II/III/IV, ATP production measurement, ROS measurement","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal functional assays (BN-PAGE, activity assays, ATP, ROS) in two cell systems following specific knockdown","pmids":["30531981"],"is_preprint":false},{"year":2021,"finding":"In C. elegans, knockout of nduf-11 (NDUFA11 homologue) caused larval arrest at L2, while RNAi knockdown destabilized complex I and its supercomplexes, perturbed respiratory function, enhanced complex II activity (compensatory), caused aberrant cristae morphology with widened cristae junctions and expanded intermembrane space as shown by cryo-electron tomography.","method":"CRISPR-Cas9 knockout, RNAi knockdown, blue-native PAGE, respiratory function assays, cryo-electron tomography","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple orthogonal methods including cryo-ET structural analysis, genetic knockouts with defined phenotypic readouts, in a well-established model organism ortholog","pmids":["34106255"],"is_preprint":false},{"year":2019,"finding":"Knockout of NDUFA11 in HEK293T cells induced long-term mitochondrial stress that decreased eIF2α (Ser51) phosphorylation and ATF4 expression while increasing S6K1 (Thr389) phosphorylation, demonstrating an adaptive long-term translational response distinct from acute mitochondrial stress.","method":"NDUFA11 knockout (HEK293T), phospho-immunoblotting for mTOR pathway components (S6K1, 4E-BP1, eIF2α), ATF4 quantification","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout with defined signaling phenotype; single lab with multiple pathway readouts","pmids":["31116686"],"is_preprint":false},{"year":2022,"finding":"Long-term mitochondrial stress induced by NDUFA11 knockout in HEK293T cells triggered Tau dimerization (first step of aggregation) via increased ROS; treatment with ROS scavengers (NAC or MitoQ) significantly reduced both ROS levels and Tau dimerization, placing NDUFA11-dependent mitochondrial function upstream of oxidative stress-driven Tau aggregation.","method":"NDUFA11 knockout (HEK293T), bimolecular fluorescence complementation assay for Tau dimerization, ROS measurement, ROS scavenger treatment (NAC, MitoQ)","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout with specific molecular readout (Tau dimerization assay) and pharmacological rescue; single lab","pmids":["35446108"],"is_preprint":false},{"year":2025,"finding":"NDUFA11 forms a complex with NDUFS1, and this NDUFS1-NDUFA11 complex abundance is decreased in ischemic stroke models in vitro and in vivo. Lentivirus-mediated overexpression of Ndufa11 enhanced NDUFS1-NDUFA11 complex formation, improved neuronal survival and action potential amplitude in OGD/R models, and suppressed disulfidptosis markers (xCT, NADP+/NADPH ratio, cystine uptake). Metformin upregulated Ndufa11 and recapitulated these effects.","method":"Co-immunoprecipitation (NDUFS1-NDUFA11 complex), lentiviral Ndufa11 overexpression, patch-clamp electrophysiology, OGD/R primary cortical neuron model, disulfidptosis marker quantification","journal":"Brain research bulletin","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (Co-IP, overexpression rescue, electrophysiology) in a single lab; gain-of-function with defined phenotypic readouts","pmids":["41236076"],"is_preprint":false},{"year":2025,"finding":"In epilepsy models, the NDUFS1-NDUFA11 protein complex is decreased (fewer formed complexes detected), placing NDUFA11 as a component of this respiratory complex I subunit interaction that is disrupted in seizure pathology.","method":"Co-immunoprecipitation of NDUFS1-NDUFA11 complexes in in vitro and in vivo seizure models, validated against bioinformatics-identified interactions","journal":"Neurobiology of disease","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP experiment in disease model context, single lab, limited mechanistic follow-up","pmids":["39805370"],"is_preprint":false},{"year":2021,"finding":"RORα transcription factor represses ROS generation in breast cancer cells by targeting complex I subunits NDUFS6 and NDUFA11, as identified by gene co-expression analysis and chromatin immunoprecipitation (ChIP), placing NDUFA11 as a transcriptional target of RORα that mediates superoxide suppression.","method":"Gene co-expression analysis, chromatin immunoprecipitation (ChIP), ROS measurement, macrophage co-culture assay","journal":"International journal of molecular sciences","confidence":"Low","confidence_rationale":"Tier 3 / Weak — ChIP identifies promoter association but direct functional link between RORα-NDUFA11 axis and ROS was not independently validated by NDUFA11-specific manipulation","pmids":["34639006"],"is_preprint":false},{"year":2016,"finding":"Phylogenetic and sequence analysis established that NDUFA11 belongs to the Tim17 protein family and is one of two Tim17-family members (alongside TIMMDC1) that reside in the mitochondrial inner membrane as part of respiratory complex I assembly, representing a functional diversification of ancestral protein translocase components.","method":"Comprehensive sequence analysis across 5631 proteomes, phylogenetic analysis","journal":"Biology direct","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — large-scale computational phylogenetics with strong prior functional validation from other studies; confirms Tim17-family membership with evolutionary evidence","pmids":["27760563"],"is_preprint":false}],"current_model":"NDUFA11 (B14.7) is a nuclear-encoded, four-transmembrane-helix subunit of the mitochondrial inner membrane arm of respiratory complex I, belonging to the Tim17 protein family, where it occupies the interface between complex I and complexes III/IV within respirasomes; it is required for proper assembly of the complex I membrane arm (its loss causes accumulation of ~550 and ~815 kDa subcomplexes), for stabilization and activity of the CI-CIII-CIV respirasome supercomplex, for normal cristae morphology, and for mitochondrial ATP production—with loss-of-function causing complex I deficiency, increased ROS, and in humans, encephalocardiomyopathy or fatal lactic acidemia; mechanistically, NDUFA11 forms a functional complex with NDUFS1 that supports mitochondrial electron transport and suppresses disulfidptosis."},"narrative":{"mechanistic_narrative":"NDUFA11 (B14.7) is a nuclear-encoded, four-transmembrane-helix subunit of the membrane arm of mitochondrial respiratory complex I that originates from the Tim17/Tim22/Tim23 family of inner-membrane protein translocases [PMID:12381726, PMID:27760563]. It is an integral component of intact complex I [PMID:12644575] and is required for assembly of the complex I membrane arm: its loss causes accumulation of ~550 and ~815 kDa subcomplexes together with a defined set of extrinsic assembly factors [PMID:24191001]. Within respirasomes, structural analysis places NDUFA11 at the interface between complex I and complexes III/IV, where it contributes to oligomerization of the CI-CIII-CIV supercomplex [PMID:27912063]; consistent with this, NDUFA11 depletion dissociates the respirasome, lowers complex I/III/IV activities, reduces ATP production, and raises mitochondrial ROS [PMID:30531981], and disrupts cristae architecture with widened cristae junctions [PMID:34106255]. Loss of NDUFA11 elicits an adaptive long-term translational stress response and drives ROS-dependent Tau dimerization [PMID:31116686, PMID:35446108]. NDUFA11 forms a complex with the complex I subunit NDUFS1 whose abundance is reduced in ischemic and seizure pathology, and restoring this complex supports neuronal survival and suppresses disulfidptosis [PMID:41236076, PMID:39805370]. A splice-site mutation deleting its first transmembrane domain destabilizes complex I and causes human complex I deficiency presenting as encephalocardiomyopathy or fatal infantile lactic acidemia [PMID:18306244].","teleology":[{"year":2002,"claim":"Establishing that an uncharacterized hydrophobic protein was a bona fide complex I subunit defined NDUFA11's molecular identity and its surprising evolutionary kinship to inner-membrane protein translocases.","evidence":"Reverse-phase HPLC, 1D/2D gel electrophoresis, peptide mass fingerprinting, and cDNA cloning of bovine heart complex I subcomplex Ialpha","pmids":["12381726"],"confidence":"High","gaps":["Functional consequence of Tim17-family homology not tested","Topology of the four predicted transmembrane helices not experimentally mapped"]},{"year":2003,"claim":"Confirming NDUFA11 across multiple isolated subcomplexes secured its assignment within the ~980 kDa, 46-subunit intact complex I.","evidence":"SDS-PAGE, 2D IEF/SDS-PAGE, HPLC, and tandem MS of purified bovine complex I subcomplexes Ilambda and Ibeta","pmids":["12644575"],"confidence":"High","gaps":["Did not address assembly role or position within the membrane arm"]},{"year":2008,"claim":"A human loss-of-function mutation answered whether NDUFA11 is physiologically required, linking its disruption directly to complex I deficiency disease.","evidence":"Homozygosity mapping and mutation analysis of patients with a splice-site mutation removing the first transmembrane domain, plus patient biochemical studies","pmids":["18306244"],"confidence":"Medium","gaps":["Mechanism inferred from predicted domain loss, not reconstituted","Why phenotype ranges from encephalocardiomyopathy to fatal lactic acidemia not resolved"]},{"year":2013,"claim":"Knockdown defined NDUFA11's biogenesis role, showing it is needed to build the complex I membrane arm rather than merely decorate the mature enzyme.","evidence":"siRNA knockdown with blue-native PAGE detection of ~550 and ~815 kDa subcomplexes and MS identification of associated assembly factors","pmids":["24191001"],"confidence":"High","gaps":["Order of incorporation relative to assembly factors not established","Direct interactions within subcomplexes not mapped"]},{"year":2016,"claim":"Structural placement and phylogenetic analysis explained how a translocase-derived subunit functions, positioning NDUFA11 at the supercomplex interface as a diversified Tim17-family member.","evidence":"4.0 Å cryo-EM of the porcine I1III2IV1 supercomplex; sequence/phylogenetic analysis across 5631 proteomes","pmids":["27912063","27760563"],"confidence":"High","gaps":["Specific contacts NDUFA11 makes with CIII/CIV not resolved at side-chain level","Whether translocase-like activity is retained not tested"]},{"year":2018,"claim":"Functional depletion linked NDUFA11 to respirasome integrity, showing its loss collapses the supercomplex and bioenergetic output while raising ROS.","evidence":"siRNA knockdown in cardioblasts and cardiac mitochondria with BN-PAGE, complex I/II/III/IV activity assays, ATP and ROS measurements","pmids":["30531981"],"confidence":"High","gaps":["Whether respirasome loss is cause or consequence of CI destabilization not disentangled"]},{"year":2021,"claim":"Cross-species genetics tied NDUFA11 to organismal viability and connected supercomplex loss to ultrastructural cristae defects.","evidence":"CRISPR knockout (L2 larval arrest) and RNAi in C. elegans with BN-PAGE, respiratory assays, and cryo-electron tomography","pmids":["34106255"],"confidence":"High","gaps":["Mechanistic link between supercomplex loss and cristae junction widening not defined"]},{"year":2022,"claim":"Knockout studies extended NDUFA11 function downstream into stress signaling and proteostasis, placing its mitochondrial role upstream of an adaptive translational program and ROS-driven Tau aggregation.","evidence":"NDUFA11 knockout in HEK293T with phospho-immunoblotting of mTOR/eIF2α-ATF4 components, BiFC Tau dimerization assay, and ROS-scavenger rescue (NAC, MitoQ)","pmids":["31116686","35446108"],"confidence":"Medium","gaps":["Signaling phenotypes from a single cell line","How chronic CI deficiency rewires the integrated stress response mechanistically not defined"]},{"year":2025,"claim":"Identification of an NDUFS1-NDUFA11 complex linked NDUFA11 abundance to neuronal disease outcomes and to a disulfidptosis-suppressing function.","evidence":"Co-IP of NDUFS1-NDUFA11, lentiviral Ndufa11 overexpression, patch-clamp, and OGD/R neuron and seizure models with disulfidptosis marker quantification","pmids":["41236076","39805370"],"confidence":"Medium","gaps":["Direct vs indirect nature of NDUFS1-NDUFA11 interaction not fully established","Seizure-model finding rests on a single low-confidence Co-IP","Mechanism linking the complex to disulfidptosis suppression not resolved"]},{"year":null,"claim":"How NDUFA11 mechanically nucleates membrane-arm assembly and stabilizes the CI-CIII-CIV interface at the molecular level, and whether any ancestral translocase activity is retained, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No reconstituted assembly intermediate with defined NDUFA11 contacts","No high-resolution map of NDUFA11-CIII/CIV interface side chains","Functional test of Tim17-family translocase activity absent"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,1,2,4]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,5,6]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[5,6]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[3]}],"complexes":["Respiratory complex I","CI-CIII-CIV respirasome supercomplex"],"partners":["NDUFS1","TIMMDC1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q86Y39","full_name":"NADH dehydrogenase [ubiquinone] 1 alpha subcomplex subunit 11","aliases":["Complex I-B14.7","CI-B14.7","NADH-ubiquinone oxidoreductase subunit B14.7"],"length_aa":141,"mass_kda":14.9,"function":"Accessory subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I), that is believed not to be involved in catalysis. Complex I functions in the transfer of electrons from NADH to the respiratory chain. The immediate electron acceptor for the enzyme is believed to be ubiquinone","subcellular_location":"Mitochondrion inner membrane","url":"https://www.uniprot.org/uniprotkb/Q86Y39/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/NDUFA11","classification":"Common Essential","n_dependent_lines":735,"n_total_lines":1208,"dependency_fraction":0.6084437086092715},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/NDUFA11","total_profiled":1310},"omim":[{"mim_id":"618236","title":"MITOCHONDRIAL COMPLEX I DEFICIENCY, NUCLEAR TYPE 14; MC1DN14","url":"https://www.omim.org/entry/618236"},{"mim_id":"612638","title":"NADH-UBIQUINONE OXIDOREDUCTASE SUBUNIT A11; NDUFA11","url":"https://www.omim.org/entry/612638"},{"mim_id":"252010","title":"MITOCHONDRIAL COMPLEX I DEFICIENCY, NUCLEAR TYPE 1; MC1DN1","url":"https://www.omim.org/entry/252010"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Mitochondria","reliability":"Approved"},{"location":"End piece","reliability":"Approved"},{"location":"Perinuclear theca","reliability":"Additional"},{"location":"Principal piece","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/NDUFA11"},"hgnc":{"alias_symbol":["B14.7"],"prev_symbol":[]},"alphafold":{"accession":"Q86Y39","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q86Y39","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q86Y39-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q86Y39-F1-predicted_aligned_error_v6.png","plddt_mean":89.81},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NDUFA11","jax_strain_url":"https://www.jax.org/strain/search?query=NDUFA11"},"sequence":{"accession":"Q86Y39","fasta_url":"https://rest.uniprot.org/uniprotkb/Q86Y39.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q86Y39/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q86Y39"}},"corpus_meta":[{"pmid":"12644575","id":"PMC_12644575","title":"Analysis of the subunit composition of complex I from bovine heart mitochondria.","date":"2003","source":"Molecular & cellular proteomics : MCP","url":"https://pubmed.ncbi.nlm.nih.gov/12644575","citation_count":310,"is_preprint":false},{"pmid":"27912063","id":"PMC_27912063","title":"Structure of Mammalian Respiratory Supercomplex I1III2IV1.","date":"2016","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/27912063","citation_count":309,"is_preprint":false},{"pmid":"12381726","id":"PMC_12381726","title":"Definition of the nuclear encoded protein composition of bovine heart mitochondrial complex I. 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standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2002,\n      \"finding\": \"NDUFA11 (B14.7) was identified as a novel nuclear-encoded subunit of bovine heart mitochondrial complex I, located in subcomplex Ialpha. The protein has an acetylated N terminus, no presequence, contains four potential transmembrane helices, and is homologous to Tim17/Tim22/Tim23 protein translocation components of the inner mitochondrial membrane.\",\n      \"method\": \"Reverse-phase HPLC, 1D and 2D gel electrophoresis, tryptic peptide mass fingerprinting, tandem mass spectrometry, cDNA cloning and sequencing\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct biochemical identification by multiple orthogonal MS methods and cDNA confirmation; replicated in subsequent study (PMID:12644575)\",\n      \"pmids\": [\"12381726\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"NDUFA11 (B14.7) was confirmed as a subunit of bovine heart complex I found in subcomplexes Ilambda and Ibeta, establishing that the intact complex I contains 46 subunits with a mass of ~980 kDa. B14.7 was detected specifically in subcomplex Ilambda by SDS-PAGE and in subcomplex Ibeta by HPLC analysis.\",\n      \"method\": \"1D SDS-PAGE, 2D isoelectric focusing/SDS-PAGE, reverse-phase HPLC, tryptic peptide mass fingerprinting, tandem mass spectrometry, electrospray ionization MS\",\n      \"journal\": \"Molecular & cellular proteomics : MCP\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal biochemical methods on purified complex, replicating and extending PMID:12381726\",\n      \"pmids\": [\"12644575\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Suppression of NDUFA11 expression disrupted assembly of complex I, causing accumulation of subcomplexes at ~550 kDa and ~815 kDa, and was associated with eight known extrinsic assembly factors plus the hydrophobic protein C3orf1 in these subcomplexes. This establishes NDUFA11 as required for constructing the membrane arm of complex I.\",\n      \"method\": \"siRNA knockdown, blue-native PAGE to detect subcomplexes, mass spectrometry of associated assembly factors\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean knockdown with defined biochemical phenotype (subcomplex accumulation) and identification of associated assembly factors by MS; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"24191001\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"A splice-site mutation in NDUFA11 causing loss of the first transmembrane domain destabilizes complex I and causes mitochondrial complex I deficiency, manifesting as encephalocardiomyopathy or fatal infantile lactic acidemia in human patients.\",\n      \"method\": \"Homozygosity mapping, mutation analysis, patient biochemical studies\",\n      \"journal\": \"Annals of neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — human genetic loss-of-function with defined enzymatic deficiency; mechanism inferred from predicted domain loss, not directly reconstituted\",\n      \"pmids\": [\"18306244\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Cryo-EM structure of the porcine respiratory supercomplex I1III2IV1 at 4.0 Å showed that NDUFA11 is directly positioned at the interface between complex I and the other complexes, contributing to the oligomerization of CI, CIII, and CIV within the supercomplex.\",\n      \"method\": \"Cryo-electron microscopy at 4.0 Å resolution, structural assignment of individual subunits\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — near-atomic resolution cryo-EM structure with direct subunit placement; published in high-impact journal with rigorous structural validation\",\n      \"pmids\": [\"27912063\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Knockdown of NDUFA11 in cardioblast cells and cardiac mitochondria caused dissociation of the respirasome (CI-CIII-CIV supercomplex), reduced activities of complexes I, III, and IV, decreased ATP production, and increased mitochondrial ROS production, establishing NDUFA11 as essential for respirasome assembly and stability.\",\n      \"method\": \"siRNA knockdown, blue-native PAGE, enzyme activity assays for complexes I/II/III/IV, ATP production measurement, ROS measurement\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal functional assays (BN-PAGE, activity assays, ATP, ROS) in two cell systems following specific knockdown\",\n      \"pmids\": [\"30531981\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In C. elegans, knockout of nduf-11 (NDUFA11 homologue) caused larval arrest at L2, while RNAi knockdown destabilized complex I and its supercomplexes, perturbed respiratory function, enhanced complex II activity (compensatory), caused aberrant cristae morphology with widened cristae junctions and expanded intermembrane space as shown by cryo-electron tomography.\",\n      \"method\": \"CRISPR-Cas9 knockout, RNAi knockdown, blue-native PAGE, respiratory function assays, cryo-electron tomography\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple orthogonal methods including cryo-ET structural analysis, genetic knockouts with defined phenotypic readouts, in a well-established model organism ortholog\",\n      \"pmids\": [\"34106255\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Knockout of NDUFA11 in HEK293T cells induced long-term mitochondrial stress that decreased eIF2α (Ser51) phosphorylation and ATF4 expression while increasing S6K1 (Thr389) phosphorylation, demonstrating an adaptive long-term translational response distinct from acute mitochondrial stress.\",\n      \"method\": \"NDUFA11 knockout (HEK293T), phospho-immunoblotting for mTOR pathway components (S6K1, 4E-BP1, eIF2α), ATF4 quantification\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout with defined signaling phenotype; single lab with multiple pathway readouts\",\n      \"pmids\": [\"31116686\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Long-term mitochondrial stress induced by NDUFA11 knockout in HEK293T cells triggered Tau dimerization (first step of aggregation) via increased ROS; treatment with ROS scavengers (NAC or MitoQ) significantly reduced both ROS levels and Tau dimerization, placing NDUFA11-dependent mitochondrial function upstream of oxidative stress-driven Tau aggregation.\",\n      \"method\": \"NDUFA11 knockout (HEK293T), bimolecular fluorescence complementation assay for Tau dimerization, ROS measurement, ROS scavenger treatment (NAC, MitoQ)\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout with specific molecular readout (Tau dimerization assay) and pharmacological rescue; single lab\",\n      \"pmids\": [\"35446108\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NDUFA11 forms a complex with NDUFS1, and this NDUFS1-NDUFA11 complex abundance is decreased in ischemic stroke models in vitro and in vivo. Lentivirus-mediated overexpression of Ndufa11 enhanced NDUFS1-NDUFA11 complex formation, improved neuronal survival and action potential amplitude in OGD/R models, and suppressed disulfidptosis markers (xCT, NADP+/NADPH ratio, cystine uptake). Metformin upregulated Ndufa11 and recapitulated these effects.\",\n      \"method\": \"Co-immunoprecipitation (NDUFS1-NDUFA11 complex), lentiviral Ndufa11 overexpression, patch-clamp electrophysiology, OGD/R primary cortical neuron model, disulfidptosis marker quantification\",\n      \"journal\": \"Brain research bulletin\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (Co-IP, overexpression rescue, electrophysiology) in a single lab; gain-of-function with defined phenotypic readouts\",\n      \"pmids\": [\"41236076\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In epilepsy models, the NDUFS1-NDUFA11 protein complex is decreased (fewer formed complexes detected), placing NDUFA11 as a component of this respiratory complex I subunit interaction that is disrupted in seizure pathology.\",\n      \"method\": \"Co-immunoprecipitation of NDUFS1-NDUFA11 complexes in in vitro and in vivo seizure models, validated against bioinformatics-identified interactions\",\n      \"journal\": \"Neurobiology of disease\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP experiment in disease model context, single lab, limited mechanistic follow-up\",\n      \"pmids\": [\"39805370\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RORα transcription factor represses ROS generation in breast cancer cells by targeting complex I subunits NDUFS6 and NDUFA11, as identified by gene co-expression analysis and chromatin immunoprecipitation (ChIP), placing NDUFA11 as a transcriptional target of RORα that mediates superoxide suppression.\",\n      \"method\": \"Gene co-expression analysis, chromatin immunoprecipitation (ChIP), ROS measurement, macrophage co-culture assay\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — ChIP identifies promoter association but direct functional link between RORα-NDUFA11 axis and ROS was not independently validated by NDUFA11-specific manipulation\",\n      \"pmids\": [\"34639006\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Phylogenetic and sequence analysis established that NDUFA11 belongs to the Tim17 protein family and is one of two Tim17-family members (alongside TIMMDC1) that reside in the mitochondrial inner membrane as part of respiratory complex I assembly, representing a functional diversification of ancestral protein translocase components.\",\n      \"method\": \"Comprehensive sequence analysis across 5631 proteomes, phylogenetic analysis\",\n      \"journal\": \"Biology direct\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — large-scale computational phylogenetics with strong prior functional validation from other studies; confirms Tim17-family membership with evolutionary evidence\",\n      \"pmids\": [\"27760563\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NDUFA11 (B14.7) is a nuclear-encoded, four-transmembrane-helix subunit of the mitochondrial inner membrane arm of respiratory complex I, belonging to the Tim17 protein family, where it occupies the interface between complex I and complexes III/IV within respirasomes; it is required for proper assembly of the complex I membrane arm (its loss causes accumulation of ~550 and ~815 kDa subcomplexes), for stabilization and activity of the CI-CIII-CIV respirasome supercomplex, for normal cristae morphology, and for mitochondrial ATP production—with loss-of-function causing complex I deficiency, increased ROS, and in humans, encephalocardiomyopathy or fatal lactic acidemia; mechanistically, NDUFA11 forms a functional complex with NDUFS1 that supports mitochondrial electron transport and suppresses disulfidptosis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NDUFA11 (B14.7) is a nuclear-encoded, four-transmembrane-helix subunit of the membrane arm of mitochondrial respiratory complex I that originates from the Tim17/Tim22/Tim23 family of inner-membrane protein translocases [#0, #12]. It is an integral component of intact complex I [#1] and is required for assembly of the complex I membrane arm: its loss causes accumulation of ~550 and ~815 kDa subcomplexes together with a defined set of extrinsic assembly factors [#2]. Within respirasomes, structural analysis places NDUFA11 at the interface between complex I and complexes III/IV, where it contributes to oligomerization of the CI-CIII-CIV supercomplex [#4]; consistent with this, NDUFA11 depletion dissociates the respirasome, lowers complex I/III/IV activities, reduces ATP production, and raises mitochondrial ROS [#5], and disrupts cristae architecture with widened cristae junctions [#6]. Loss of NDUFA11 elicits an adaptive long-term translational stress response and drives ROS-dependent Tau dimerization [#7, #8]. NDUFA11 forms a complex with the complex I subunit NDUFS1 whose abundance is reduced in ischemic and seizure pathology, and restoring this complex supports neuronal survival and suppresses disulfidptosis [#9, #10]. A splice-site mutation deleting its first transmembrane domain destabilizes complex I and causes human complex I deficiency presenting as encephalocardiomyopathy or fatal infantile lactic acidemia [#3].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Establishing that an uncharacterized hydrophobic protein was a bona fide complex I subunit defined NDUFA11's molecular identity and its surprising evolutionary kinship to inner-membrane protein translocases.\",\n      \"evidence\": \"Reverse-phase HPLC, 1D/2D gel electrophoresis, peptide mass fingerprinting, and cDNA cloning of bovine heart complex I subcomplex Ialpha\",\n      \"pmids\": [\"12381726\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of Tim17-family homology not tested\", \"Topology of the four predicted transmembrane helices not experimentally mapped\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Confirming NDUFA11 across multiple isolated subcomplexes secured its assignment within the ~980 kDa, 46-subunit intact complex I.\",\n      \"evidence\": \"SDS-PAGE, 2D IEF/SDS-PAGE, HPLC, and tandem MS of purified bovine complex I subcomplexes Ilambda and Ibeta\",\n      \"pmids\": [\"12644575\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address assembly role or position within the membrane arm\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"A human loss-of-function mutation answered whether NDUFA11 is physiologically required, linking its disruption directly to complex I deficiency disease.\",\n      \"evidence\": \"Homozygosity mapping and mutation analysis of patients with a splice-site mutation removing the first transmembrane domain, plus patient biochemical studies\",\n      \"pmids\": [\"18306244\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism inferred from predicted domain loss, not reconstituted\", \"Why phenotype ranges from encephalocardiomyopathy to fatal lactic acidemia not resolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Knockdown defined NDUFA11's biogenesis role, showing it is needed to build the complex I membrane arm rather than merely decorate the mature enzyme.\",\n      \"evidence\": \"siRNA knockdown with blue-native PAGE detection of ~550 and ~815 kDa subcomplexes and MS identification of associated assembly factors\",\n      \"pmids\": [\"24191001\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Order of incorporation relative to assembly factors not established\", \"Direct interactions within subcomplexes not mapped\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Structural placement and phylogenetic analysis explained how a translocase-derived subunit functions, positioning NDUFA11 at the supercomplex interface as a diversified Tim17-family member.\",\n      \"evidence\": \"4.0 Å cryo-EM of the porcine I1III2IV1 supercomplex; sequence/phylogenetic analysis across 5631 proteomes\",\n      \"pmids\": [\"27912063\", \"27760563\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific contacts NDUFA11 makes with CIII/CIV not resolved at side-chain level\", \"Whether translocase-like activity is retained not tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Functional depletion linked NDUFA11 to respirasome integrity, showing its loss collapses the supercomplex and bioenergetic output while raising ROS.\",\n      \"evidence\": \"siRNA knockdown in cardioblasts and cardiac mitochondria with BN-PAGE, complex I/II/III/IV activity assays, ATP and ROS measurements\",\n      \"pmids\": [\"30531981\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether respirasome loss is cause or consequence of CI destabilization not disentangled\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Cross-species genetics tied NDUFA11 to organismal viability and connected supercomplex loss to ultrastructural cristae defects.\",\n      \"evidence\": \"CRISPR knockout (L2 larval arrest) and RNAi in C. elegans with BN-PAGE, respiratory assays, and cryo-electron tomography\",\n      \"pmids\": [\"34106255\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanistic link between supercomplex loss and cristae junction widening not defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Knockout studies extended NDUFA11 function downstream into stress signaling and proteostasis, placing its mitochondrial role upstream of an adaptive translational program and ROS-driven Tau aggregation.\",\n      \"evidence\": \"NDUFA11 knockout in HEK293T with phospho-immunoblotting of mTOR/eIF2α-ATF4 components, BiFC Tau dimerization assay, and ROS-scavenger rescue (NAC, MitoQ)\",\n      \"pmids\": [\"31116686\", \"35446108\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Signaling phenotypes from a single cell line\", \"How chronic CI deficiency rewires the integrated stress response mechanistically not defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identification of an NDUFS1-NDUFA11 complex linked NDUFA11 abundance to neuronal disease outcomes and to a disulfidptosis-suppressing function.\",\n      \"evidence\": \"Co-IP of NDUFS1-NDUFA11, lentiviral Ndufa11 overexpression, patch-clamp, and OGD/R neuron and seizure models with disulfidptosis marker quantification\",\n      \"pmids\": [\"41236076\", \"39805370\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect nature of NDUFS1-NDUFA11 interaction not fully established\", \"Seizure-model finding rests on a single low-confidence Co-IP\", \"Mechanism linking the complex to disulfidptosis suppression not resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How NDUFA11 mechanically nucleates membrane-arm assembly and stabilizes the CI-CIII-CIV interface at the molecular level, and whether any ancestral translocase activity is retained, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No reconstituted assembly intermediate with defined NDUFA11 contacts\", \"No high-resolution map of NDUFA11-CIII/CIV interface side chains\", \"Functional test of Tim17-family translocase activity absent\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 1, 2, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005743\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 5, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [5, 6]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"complexes\": [\n      \"Respiratory complex I\",\n      \"CI-CIII-CIV respirasome supercomplex\"\n    ],\n    \"partners\": [\n      \"NDUFS1\",\n      \"TIMMDC1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}