{"gene":"DLD","run_date":"2026-04-28T17:46:02","timeline":{"discoveries":[{"year":2017,"finding":"Human dihydrolipoamide dehydrogenase (DLD/E3) is the common E3 subunit shared by the α-ketoglutarate dehydrogenase complex (KGDHc), pyruvate dehydrogenase complex (PDHc), and branched-chain α-keto acid dehydrogenase complexes, and is also part of the glycine cleavage system; disease-causing DLD variants impair E3 enzymatic activity and simultaneously incapacitate these multiple central metabolic pathways, causing lactic acidosis and neurological, cardiological, and hepatological manifestations. Selected pathogenic hE3 variants additionally lose their affinity for the E2 component of hPDHc. Enhanced reactive oxygen species (ROS) generation by disease-causing hE3 variants contributes to disease pathogenesis, and lipoic acid was demonstrated to potently inhibit ROS generation by hE3 in vitro.","method":"Biochemical assays of disease-causing DLD mutant variants (enzymatic activity, ROS generation, FAD binding, E2-binding affinity); review synthesizing molecular pathogenesis data","journal":"Neurochemistry international","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal in vitro biochemical methods across multiple variants, replicated findings across the field","pmids":["28579060"],"is_preprint":false},{"year":2013,"finding":"A novel compound heterozygous DLD mutation (p.I353T and p.G136del) causes dihydrolipoamide dehydrogenase deficiency with Leigh syndrome; E3 enzymatic activity from patient fibroblasts was 9–29% of mean control values, confirming loss-of-function at the enzyme level and demonstrating that DLD loss of function leads to Leigh syndrome pathology.","method":"Enzymatic assay of E3 activity in cultured skin fibroblasts; molecular analysis confirming compound heterozygosity; neuroimaging","journal":"Pediatric neurology","confidence":"Medium","confidence_rationale":"Tier 2 — enzymatic activity measurement in patient-derived cells with molecular confirmation, single study","pmids":["23290025"],"is_preprint":false},{"year":2019,"finding":"Mitochondrial DLD (dihydrolipoamide dehydrogenase) participates in the regulation of reactive oxygen species (ROS) and reactive nitrogen species production in a physiological/pathophysiological context-dependent manner; inhibition of DLDH induces antioxidative responses, suggesting DLD activity modulates cellular redox balance beyond its canonical metabolic decarboxylation role.","method":"DLDH inhibitor studies; review of metabolic pathway analysis linking DLDH to ROS regulation","journal":"Antioxidants (Basel, Switzerland)","confidence":"Low","confidence_rationale":"Tier 3 — pharmacological inhibition with phenotypic readout, limited mechanistic resolution","pmids":["30717346"],"is_preprint":false},{"year":2020,"finding":"DLD (dihydrolipoamide dehydrogenase) is required for cystine deprivation-induced ferroptosis in head and neck cancer cells; cystine deprivation increases α-ketoglutarate dehydrogenase (KGDH) activity, mitochondrial membrane potential, succinate content, and mitochondrial free iron levels, all of which are blocked by DLD siRNA/shRNA knockdown and rescued by re-expression of DLD cDNA. DLD knockdown specifically reduced lipid ROS and mitochondrial iron accumulation, placing DLD upstream of iron-dependent lipid peroxidation in the ferroptosis pathway.","method":"siRNA/shRNA knockdown, cDNA rescue, in vitro cell death assays, lipid ROS measurement, mitochondrial iron measurement, KGDH activity assay, mouse xenograft models","journal":"Redox biology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (KD, rescue, enzymatic assays, in vivo), replicated in cell lines and mouse model","pmids":["31931284"],"is_preprint":false},{"year":2003,"finding":"The pyruvate dehydrogenase complex (PDC), of which DLD/E3 is the catalytic E3 subunit, is regulated by phosphorylation (inactivation) by pyruvate dehydrogenase kinases (PDKs 1–4) and dephosphorylation (activation) by pyruvate dehydrogenase phosphatases (PDPs 1 and 2); isoform-specific differences in PDK kinetic parameters and phosphorylation-site specificity modulate PDC (and thus DLD-dependent) activity across metabolic states.","method":"Biochemical characterization of PDC regulation; kinase/phosphatase assays; review synthesizing regulation of the complex containing DLD","journal":"American journal of physiology. Endocrinology and metabolism","confidence":"High","confidence_rationale":"Tier 1-2 — well-established biochemistry replicated across many labs, foundational mechanistic understanding of the complex housing DLD","pmids":["12676647"],"is_preprint":false},{"year":1990,"finding":"Structural and functional studies of dihydrolipoamide acyltransferases (E2 subunits) in the multienzyme complexes that harbor DLD/E3 established the modular domain architecture (lipoyl domains, E3-binding domain, catalytic domain) required for assembly of functional dehydrogenase complexes containing DLD/E3 and defined structure-function relationships governing substrate channeling.","method":"Biochemical reconstitution, domain-deletion analysis, in vitro enzymatic assays of dihydrolipoamide acyltransferase complexes","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — reconstitution and mutagenesis, foundational study, widely replicated","pmids":["2188967"],"is_preprint":false},{"year":2017,"finding":"The α-ketoglutarate dehydrogenase complex (α-KGDH, which contains DLD as its E3 subunit) is localized in the nucleus in human cell lines, where it associates with KAT2A (GCN5) at gene promoter regions and supplies succinyl-CoA for histone H3 lysine 79 succinylation; preventing nuclear entry of the α-KGDH complex reduces gene expression and inhibits tumor cell proliferation, placing the DLD-containing complex at the intersection of mitochondrial metabolism and epigenetic regulation.","method":"Subcellular fractionation, co-immunoprecipitation, ChIP-seq, crystal structure of KAT2A with succinyl-CoA, site-directed mutagenesis, in vivo tumor growth assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1-2 — crystal structure + mutagenesis + fractionation + functional in vivo validation in single study","pmids":["29211711"],"is_preprint":false}],"current_model":"DLD encodes dihydrolipoamide dehydrogenase (DLDH/E3), the shared catalytic E3 subunit of the pyruvate dehydrogenase complex, α-ketoglutarate dehydrogenase complex, and branched-chain α-keto acid dehydrogenase complexes, where it catalyzes NAD⁺-dependent oxidation of dihydrolipoamide; disease-causing DLD mutations impair enzymatic activity, disrupt E2-binding affinity, and enhance ROS generation; the α-KGDH complex containing DLD also translocates to the nucleus to supply succinyl-CoA for histone succinylation, and DLD activity is specifically required for cystine deprivation-induced ferroptosis through regulation of KGDH activity and mitochondrial iron accumulation."},"narrative":{"teleology":[{"year":1990,"claim":"Defining the modular architecture of the E2 subunits that scaffold DLD/E3 into functional multienzyme complexes established how substrate channeling occurs within the dehydrogenase complexes and identified the E3-binding domain as the structural determinant for DLD recruitment.","evidence":"Biochemical reconstitution and domain-deletion analysis of dihydrolipoamide acyltransferases in vitro","pmids":["2188967"],"confidence":"High","gaps":["Structural basis for E3–E2 interaction at atomic resolution was not resolved","Regulation of DLD/E3 incorporation into different complexes in vivo was not addressed"]},{"year":2003,"claim":"Characterizing PDK/PDP-mediated phosphorylation–dephosphorylation of the pyruvate dehydrogenase complex revealed how E3-dependent catalytic flux is regulated across metabolic states, establishing that DLD activity is indirectly controlled by isoform-specific kinase and phosphatase activities acting on E1.","evidence":"Kinase/phosphatase kinetic assays and phosphorylation-site specificity analysis of PDC regulation","pmids":["12676647"],"confidence":"High","gaps":["Whether analogous regulatory phosphorylation mechanisms operate on the KGDH and BCKDH complexes housing DLD was not resolved","Direct post-translational modifications on DLD itself were not characterized"]},{"year":2013,"claim":"Identification of novel compound heterozygous DLD mutations (p.I353T/p.G136del) causing Leigh syndrome with 9–29% residual E3 activity demonstrated that partial loss of DLD function is sufficient to cause severe neurodegeneration, bridging genotype to clinical phenotype.","evidence":"Enzymatic assay of E3 activity in patient fibroblasts with molecular confirmation of compound heterozygosity","pmids":["23290025"],"confidence":"Medium","gaps":["Single family study; genotype–phenotype correlation across larger cohorts was not established","Structural consequences of these specific mutations were not resolved at atomic level"]},{"year":2017,"claim":"Systematic biochemical analysis of disease-causing DLD variants revealed that pathogenic mutations not only reduce catalytic activity but also impair E2-binding affinity and enhance ROS generation, establishing that DLD dysfunction has dual consequences—metabolic insufficiency and oxidative stress—both contributing to disease pathogenesis.","evidence":"Enzymatic activity, ROS generation, FAD binding, and E2-binding affinity assays across multiple pathogenic hE3 variants","pmids":["28579060"],"confidence":"High","gaps":["Whether ROS generation by mutant DLD is a primary driver or secondary consequence in vivo remains unresolved","Tissue-specific vulnerability to DLD mutations was not mechanistically explained"]},{"year":2017,"claim":"Discovery that the α-KGDH complex containing DLD translocates to the nucleus and supplies succinyl-CoA for KAT2A-mediated histone H3K79 succinylation fundamentally expanded DLD's functional scope from a metabolic enzyme to an epigenetic regulator affecting gene expression and tumor proliferation.","evidence":"Subcellular fractionation, co-immunoprecipitation, ChIP-seq, crystal structure of KAT2A–succinyl-CoA, site-directed mutagenesis, in vivo tumor growth assays","pmids":["29211711"],"confidence":"High","gaps":["Signal or mechanism directing α-KGDH nuclear import is unknown","Whether DLD catalytic activity is required for the nuclear function or whether DLD serves a structural role in the nuclear complex is not distinguished","Scope of genes regulated by this mechanism is incompletely mapped"]},{"year":2020,"claim":"Demonstrating that DLD is specifically required for cystine deprivation-induced ferroptosis—through regulation of KGDH activity, mitochondrial membrane potential, and mitochondrial iron accumulation—placed DLD at a mechanistic nexus between TCA cycle metabolism and regulated cell death.","evidence":"siRNA/shRNA knockdown with cDNA rescue, lipid ROS and mitochondrial iron quantification, KGDH activity assays, and mouse xenograft models in head and neck cancer cells","pmids":["31931284"],"confidence":"High","gaps":["How DLD/KGDH activity promotes mitochondrial iron accumulation mechanistically is unclear","Whether DLD's role in ferroptosis extends beyond cystine deprivation contexts or to non-cancer cells is not established"]},{"year":null,"claim":"Key unresolved questions include the mechanism of α-KGDH nuclear translocation, whether DLD has direct post-translational regulatory inputs, and how DLD-dependent ROS generation versus metabolic insufficiency contribute differentially to tissue-specific pathology in DLD deficiency.","evidence":"","pmids":[],"confidence":"Low","gaps":["Nuclear import signal/mechanism for the DLD-containing α-KGDH complex is unknown","Direct post-translational modifications of DLD itself are uncharacterized","Mechanistic basis for tissue-specific vulnerability in DLD deficiency is not resolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016491","term_label":"oxidoreductase activity","supporting_discovery_ids":[0,1,3]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,2,3]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[6]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,4,5]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[6]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[3]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[0,1]}],"complexes":["pyruvate dehydrogenase complex (PDC)","α-ketoglutarate dehydrogenase complex (KGDHc)","branched-chain α-keto acid dehydrogenase complex","glycine cleavage system"],"partners":["DLAT","DLST","KAT2A"],"other_free_text":[]},"mechanistic_narrative":"DLD encodes dihydrolipoyl dehydrogenase (E3), the FAD-dependent oxidoreductase that catalyzes NAD⁺-dependent oxidation of dihydrolipoamide as the shared E3 subunit of the pyruvate dehydrogenase complex, α-ketoglutarate dehydrogenase complex, branched-chain α-keto acid dehydrogenase complexes, and the glycine cleavage system, thereby occupying a central node in mitochondrial oxidative metabolism [PMID:28579060, PMID:2188967]. The α-KGDH complex containing DLD also translocates to the nucleus, where it associates with KAT2A to supply succinyl-CoA for histone H3 lysine 79 succinylation, linking DLD-dependent metabolism to epigenetic gene regulation and tumor cell proliferation [PMID:29211711]. DLD is specifically required for cystine deprivation-induced ferroptosis, functioning upstream of mitochondrial iron accumulation and lipid peroxidation through its regulation of α-KGDH activity [PMID:31931284]. Loss-of-function DLD mutations cause dihydrolipoamide dehydrogenase deficiency—manifesting as lactic acidosis, Leigh syndrome, and multi-organ pathology—through impaired enzymatic activity, disrupted E2 binding, and enhanced ROS generation [PMID:28579060, PMID:23290025]."},"prefetch_data":{"uniprot":{"accession":"P09622","full_name":"Dihydrolipoyl dehydrogenase, mitochondrial","aliases":["Dihydrolipoamide dehydrogenase","Glycine cleavage system L protein"],"length_aa":509,"mass_kda":54.2,"function":"Lipoamide dehydrogenase is a component of the glycine cleavage system as well as an E3 component of three alpha-ketoacid dehydrogenase complexes (pyruvate-, alpha-ketoglutarate-, and branched-chain amino acid-dehydrogenase complex) (PubMed:15712224, PubMed:16442803, PubMed:16770810, PubMed:17404228, PubMed:20160912, PubMed:20385101). The 2-oxoglutarate dehydrogenase complex is mainly active in the mitochondrion (PubMed:29211711). A fraction of the 2-oxoglutarate dehydrogenase complex also localizes in the nucleus and is required for lysine succinylation of histones: associates with KAT2A on chromatin and provides succinyl-CoA to histone succinyltransferase KAT2A (PubMed:29211711). In monomeric form may have additional moonlighting function as serine protease (PubMed:17404228). Involved in the hyperactivation of spermatazoa during capacitation and in the spermatazoal acrosome reaction (By similarity). The pyruvate dehydrogenase (PDH) complex catalyzes the overall conversion of pyruvate to acetyl-CoA and CO(2), and thereby links cytoplasmic glycolysis and the mitochondrial tricarboxylic acid (TCA) cycle (Probable). It contains multiple copies of three enzymatic components: pyruvate dehydrogenase (E1), dihydrolipoamide acetyltransferase (E2) and dihydrolipoamide dehydrogenase (E3) (Probable). The E3 subunit catalyzes reoxidation of the dihydrolipoyl moiety on lipoyl-bearing domains (LBDs) of E2 with NAD+ as the ultimate electron acceptor (PubMed:16442803, PubMed:16770810, PubMed:20160912, PubMed:20385101)","subcellular_location":"Mitochondrion matrix; Nucleus; Cell projection, cilium, flagellum; Cytoplasmic vesicle, secretory vesicle, acrosome","url":"https://www.uniprot.org/uniprotkb/P09622/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DLD","classification":"Not Classified","n_dependent_lines":298,"n_total_lines":1208,"dependency_fraction":0.24668874172185432},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"PHGDH","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/DLD","total_profiled":1310},"omim":[{"mim_id":"618083","title":"WW-BINDING PROTEIN 11; WBP11","url":"https://www.omim.org/entry/618083"},{"mim_id":"617867","title":"TUMOR PROTEIN p53-INDUCIBLE PROTEIN 11; TP53I11","url":"https://www.omim.org/entry/617867"},{"mim_id":"616299","title":"LIPOYLTRANSFERASE 1 DEFICIENCY; LIPT1D","url":"https://www.omim.org/entry/616299"},{"mim_id":"613022","title":"OXOGLUTARATE DEHYDROGENASE; OGDH","url":"https://www.omim.org/entry/613022"},{"mim_id":"609476","title":"NEMO-LIKE KINASE; NLK","url":"https://www.omim.org/entry/609476"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Mitochondria","reliability":"Approved"},{"location":"Nucleoplasm","reliability":"Additional"},{"location":"Cytokinetic bridge","reliability":"Additional"},{"location":"Primary cilium","reliability":"Additional"},{"location":"Principal piece","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"skeletal muscle","ntpm":215.8},{"tissue":"tongue","ntpm":228.7}],"url":"https://www.proteinatlas.org/search/DLD"},"hgnc":{"alias_symbol":["DLDH","E3","OGDC-E3"],"prev_symbol":["LAD","GCSL"]},"alphafold":{"accession":"P09622","domains":[{"cath_id":"3.50.50.60","chopping":"36-185_316-377","consensus_level":"high","plddt":98.0343,"start":36,"end":377},{"cath_id":"3.50.50.60","chopping":"199-313","consensus_level":"high","plddt":97.7715,"start":199,"end":313},{"cath_id":"3.30.390.30","chopping":"390-502","consensus_level":"high","plddt":98.7359,"start":390,"end":502}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P09622","model_url":"https://alphafold.ebi.ac.uk/files/AF-P09622-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P09622-F1-predicted_aligned_error_v6.png","plddt_mean":94.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DLD","jax_strain_url":"https://www.jax.org/strain/search?query=DLD"},"sequence":{"accession":"P09622","fasta_url":"https://rest.uniprot.org/uniprotkb/P09622.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P09622/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P09622"}},"corpus_meta":[{"pmid":"19489725","id":"PMC_19489725","title":"RING 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signaling","url":"https://pubmed.ncbi.nlm.nih.gov/19738201","citation_count":207,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"32203420","id":"PMC_32203420","title":"Systems analysis of RhoGEF and RhoGAP regulatory proteins reveals spatially organized RAC1 signalling from integrin adhesions.","date":"2020","source":"Nature cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/32203420","citation_count":194,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"12601813","id":"PMC_12601813","title":"Hyperubiquitination of proteins in dilated cardiomyopathy.","date":"2003","source":"Proteomics","url":"https://pubmed.ncbi.nlm.nih.gov/12601813","citation_count":185,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"32807901","id":"PMC_32807901","title":"UFMylation maintains tumour suppressor p53 stability by antagonizing its ubiquitination.","date":"2020","source":"Nature cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/32807901","citation_count":168,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"12690205","id":"PMC_12690205","title":"Human chromosome 7: DNA sequence and biology.","date":"2003","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/12690205","citation_count":154,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"22586326","id":"PMC_22586326","title":"Functional proteomics establishes the interaction of SIRT7 with chromatin remodeling complexes and expands its role in regulation of RNA polymerase I transcription.","date":"2012","source":"Molecular & cellular proteomics : MCP","url":"https://pubmed.ncbi.nlm.nih.gov/22586326","citation_count":145,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"20833797","id":"PMC_20833797","title":"Phosphoproteome analysis of functional mitochondria isolated from resting human muscle reveals extensive phosphorylation of inner membrane protein complexes and enzymes.","date":"2010","source":"Molecular & cellular proteomics : MCP","url":"https://pubmed.ncbi.nlm.nih.gov/20833797","citation_count":138,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"31931284","id":"PMC_31931284","title":"Dihydrolipoamide dehydrogenase regulates cystine deprivation-induced ferroptosis in head and neck cancer.","date":"2020","source":"Redox biology","url":"https://pubmed.ncbi.nlm.nih.gov/31931284","citation_count":131,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":42066,"output_tokens":1296,"usd":0.072819},"stage2":{"model":"claude-opus-4-6","input_tokens":4230,"output_tokens":1277,"usd":0.079613},"total_usd":0.379013,"stage1_batch_id":"msgbatch_0118RScg3WGaGkaZRtWZbtce","stage2_batch_id":"msgbatch_01Cpfzvtbj42aqp5oYZ5Te2s","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":54024,"output_tokens":2697,"usd":0.101264},"round2_rules_fired":"R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":5674,"output_tokens":2207,"usd":0.125317}},"stage1_raw":"Looking at the corpus, I need to identify papers about the human gene DLD (dihydrolipoamide dehydrogenase, also known as E3 subunit of alpha-keto acid dehydrogenase complexes). \n\nThe vast majority of papers in this corpus are about E3 ubiquitin ligases (a completely different meaning of \"E3\") or about \"DLD\" as a cell line (DLD-1 colorectal cancer cells) or other unrelated topics. Only papers 52, 55, and 77 are about the actual DLD gene (dihydrolipoamide dehydrogenase).\n\nLet me extract mechanistic findings from those relevant papers:\n\n- Paper 52 (PMID:28579060): Reviews molecular pathogenesis of DLD/E3 deficiency, discussing ROS generation, FAD binding, E2 subcomplex interactions\n- Paper 55 (PMID:23290025): Clinical/molecular diagnosis paper with compound heterozygous mutations\n- Paper 77 (PMID:30717346): Discusses DLDH's role in mitochondrial metabolic pathways and ROS generation\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2017,\n      \"finding\": \"Human dihydrolipoamide dehydrogenase (DLD/E3/LADH) functions as the common E3 subunit of the alpha-ketoglutarate dehydrogenase complex (KGDHc), pyruvate dehydrogenase complex (PDHc), branched-chain alpha-keto acid dehydrogenase complex, and the glycine cleavage system; loss-of-function mutations cause simultaneous incapacitation of all these central metabolic pathways.\",\n      \"method\": \"Biochemical characterization of patient-derived fibroblasts and recombinant mutant proteins; enzymatic activity assays\",\n      \"journal\": \"Neurochemistry international\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal biochemical methods across multiple complexes, replicated in patient material\",\n      \"pmids\": [\"28579060\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Disease-causing hDLD variants generate elevated reactive oxygen species (ROS); lipoic acid inhibits ROS generation by hE3 in vitro, and FAD supplementation may benefit mutations that trigger FAD loss in the hE3 component. Selected pathogenic hE3 variants lose affinity for the E2 component of the hPDHc.\",\n      \"method\": \"In vitro ROS generation assays with recombinant wild-type and mutant hE3 proteins; FAD binding assays; E2-E3 interaction studies\",\n      \"journal\": \"Neurochemistry international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro biochemical assays with recombinant proteins, single lab\",\n      \"pmids\": [\"28579060\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Mitochondrial DLDH (dihydrolipoamide dehydrogenase) participates in decarboxylation of pyruvate to form acetyl-CoA and mitochondrial ATP production; depending on physiological or pathophysiological conditions, DLDH can either enhance or attenuate production of reactive oxygen species (ROS) and reactive nitrogen species.\",\n      \"method\": \"Biochemical pathway analysis and inhibitor studies in cellular models\",\n      \"journal\": \"Antioxidants\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — biochemical inhibitor studies with mechanistic pathway analysis, single lab\",\n      \"pmids\": [\"30717346\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Novel compound heterozygous DLD mutations (p.I353T and p.G136del) confirmed by enzymatic assay showing E3 (dihydrolipoamide dehydrogenase) activity from cultured skin fibroblasts ranging from 9–29% of normal mean, establishing loss-of-function mechanism for Leigh syndrome and metabolic decompensation.\",\n      \"method\": \"Enzymatic activity assay in patient-derived fibroblasts; molecular mutation analysis\",\n      \"journal\": \"Pediatric neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct enzymatic activity measurement in patient-derived cells with genotype-phenotype correlation\",\n      \"pmids\": [\"23290025\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DLD encodes dihydrolipoamide dehydrogenase (LADH/E3), a FAD-containing oxidoreductase that serves as the shared E3 subunit of the pyruvate dehydrogenase complex, alpha-ketoglutarate dehydrogenase complex, branched-chain alpha-keto acid dehydrogenase complex, and glycine cleavage system; loss-of-function mutations simultaneously impair all these central metabolic pathways and cause lactic acidosis, while pathogenic variants also aberrantly generate reactive oxygen species and lose affinity for their cognate E2 subunits.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nLooking at the corpus, I need to identify papers about the canonical DLD gene, which encodes **dihydrolipoamide dehydrogenase (DLDH/E3)** — the E3 subunit of the pyruvate dehydrogenase complex, α-ketoglutarate dehydrogenase complex, and branched-chain α-keto acid dehydrogenase complex.\n\n**Classification:**\n- Papers [1]-[50] (retrieved corpus) are almost entirely about E3 ubiquitin ligases — these are EXCLUDE (alias collision: \"E3\" as ubiquitin ligase vs. DLD as dihydrolipoamide dehydrogenase subunit)\n- Paper [52]: KEEP — directly about human DLD/dihydrolipoamide dehydrogenase E3 deficiency\n- Paper [55]: KEEP — about DLD mutation causing E3 deficiency/Leigh syndrome\n- Paper [66]: EXCLUDE — about DLD as deterministic lateral displacement microfluidics\n- Paper [76]: EXCLUDE — \"DLD\" refers to a cancer cell line (DLD-1), not the gene\n- Paper [77]: KEEP — about mitochondrial DLDH (DLD gene product)\n- Paper [86]: EXCLUDE — DLD-1 is a colorectal cancer cell line, not the DLD gene\n- Paper [87]: EXCLUDE — E1, E2, E3 are small nucleolar RNAs, not DLD\n- Paper [91]: EXCLUDE — DLD = Developmental Language Disorder\n- Paper [98]: EXCLUDE — E3 = colicin E3 receptor (bacterial)\n- Paper [100]: EXCLUDE — DLD-1 cancer cell line\n\n**gene2pubmed papers:**\n- Paper [12] (PMID:29211711): KEEP — α-KGDH complex in nucleus, involves DLD as E3 subunit\n- Paper [14] (PMID:12676647): KEEP — PDC regulation, involves DLD as E3 subunit\n- Paper [18] (PMID:2188967): KEEP — structure-function of dihydrolipoamide acyltransferases (E2), directly related to complexes containing DLD/E3\n- Paper [30] (PMID:31931284): KEEP — DLD role in ferroptosis\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2017,\n      \"finding\": \"Human dihydrolipoamide dehydrogenase (DLD/E3) is the common E3 subunit shared by the α-ketoglutarate dehydrogenase complex (KGDHc), pyruvate dehydrogenase complex (PDHc), and branched-chain α-keto acid dehydrogenase complexes, and is also part of the glycine cleavage system; disease-causing DLD variants impair E3 enzymatic activity and simultaneously incapacitate these multiple central metabolic pathways, causing lactic acidosis and neurological, cardiological, and hepatological manifestations. Selected pathogenic hE3 variants additionally lose their affinity for the E2 component of hPDHc. Enhanced reactive oxygen species (ROS) generation by disease-causing hE3 variants contributes to disease pathogenesis, and lipoic acid was demonstrated to potently inhibit ROS generation by hE3 in vitro.\",\n      \"method\": \"Biochemical assays of disease-causing DLD mutant variants (enzymatic activity, ROS generation, FAD binding, E2-binding affinity); review synthesizing molecular pathogenesis data\",\n      \"journal\": \"Neurochemistry international\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal in vitro biochemical methods across multiple variants, replicated findings across the field\",\n      \"pmids\": [\"28579060\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"A novel compound heterozygous DLD mutation (p.I353T and p.G136del) causes dihydrolipoamide dehydrogenase deficiency with Leigh syndrome; E3 enzymatic activity from patient fibroblasts was 9–29% of mean control values, confirming loss-of-function at the enzyme level and demonstrating that DLD loss of function leads to Leigh syndrome pathology.\",\n      \"method\": \"Enzymatic assay of E3 activity in cultured skin fibroblasts; molecular analysis confirming compound heterozygosity; neuroimaging\",\n      \"journal\": \"Pediatric neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — enzymatic activity measurement in patient-derived cells with molecular confirmation, single study\",\n      \"pmids\": [\"23290025\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Mitochondrial DLD (dihydrolipoamide dehydrogenase) participates in the regulation of reactive oxygen species (ROS) and reactive nitrogen species production in a physiological/pathophysiological context-dependent manner; inhibition of DLDH induces antioxidative responses, suggesting DLD activity modulates cellular redox balance beyond its canonical metabolic decarboxylation role.\",\n      \"method\": \"DLDH inhibitor studies; review of metabolic pathway analysis linking DLDH to ROS regulation\",\n      \"journal\": \"Antioxidants (Basel, Switzerland)\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — pharmacological inhibition with phenotypic readout, limited mechanistic resolution\",\n      \"pmids\": [\"30717346\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DLD (dihydrolipoamide dehydrogenase) is required for cystine deprivation-induced ferroptosis in head and neck cancer cells; cystine deprivation increases α-ketoglutarate dehydrogenase (KGDH) activity, mitochondrial membrane potential, succinate content, and mitochondrial free iron levels, all of which are blocked by DLD siRNA/shRNA knockdown and rescued by re-expression of DLD cDNA. DLD knockdown specifically reduced lipid ROS and mitochondrial iron accumulation, placing DLD upstream of iron-dependent lipid peroxidation in the ferroptosis pathway.\",\n      \"method\": \"siRNA/shRNA knockdown, cDNA rescue, in vitro cell death assays, lipid ROS measurement, mitochondrial iron measurement, KGDH activity assay, mouse xenograft models\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (KD, rescue, enzymatic assays, in vivo), replicated in cell lines and mouse model\",\n      \"pmids\": [\"31931284\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"The pyruvate dehydrogenase complex (PDC), of which DLD/E3 is the catalytic E3 subunit, is regulated by phosphorylation (inactivation) by pyruvate dehydrogenase kinases (PDKs 1–4) and dephosphorylation (activation) by pyruvate dehydrogenase phosphatases (PDPs 1 and 2); isoform-specific differences in PDK kinetic parameters and phosphorylation-site specificity modulate PDC (and thus DLD-dependent) activity across metabolic states.\",\n      \"method\": \"Biochemical characterization of PDC regulation; kinase/phosphatase assays; review synthesizing regulation of the complex containing DLD\",\n      \"journal\": \"American journal of physiology. Endocrinology and metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — well-established biochemistry replicated across many labs, foundational mechanistic understanding of the complex housing DLD\",\n      \"pmids\": [\"12676647\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"Structural and functional studies of dihydrolipoamide acyltransferases (E2 subunits) in the multienzyme complexes that harbor DLD/E3 established the modular domain architecture (lipoyl domains, E3-binding domain, catalytic domain) required for assembly of functional dehydrogenase complexes containing DLD/E3 and defined structure-function relationships governing substrate channeling.\",\n      \"method\": \"Biochemical reconstitution, domain-deletion analysis, in vitro enzymatic assays of dihydrolipoamide acyltransferase complexes\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution and mutagenesis, foundational study, widely replicated\",\n      \"pmids\": [\"2188967\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The α-ketoglutarate dehydrogenase complex (α-KGDH, which contains DLD as its E3 subunit) is localized in the nucleus in human cell lines, where it associates with KAT2A (GCN5) at gene promoter regions and supplies succinyl-CoA for histone H3 lysine 79 succinylation; preventing nuclear entry of the α-KGDH complex reduces gene expression and inhibits tumor cell proliferation, placing the DLD-containing complex at the intersection of mitochondrial metabolism and epigenetic regulation.\",\n      \"method\": \"Subcellular fractionation, co-immunoprecipitation, ChIP-seq, crystal structure of KAT2A with succinyl-CoA, site-directed mutagenesis, in vivo tumor growth assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — crystal structure + mutagenesis + fractionation + functional in vivo validation in single study\",\n      \"pmids\": [\"29211711\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DLD encodes dihydrolipoamide dehydrogenase (DLDH/E3), the shared catalytic E3 subunit of the pyruvate dehydrogenase complex, α-ketoglutarate dehydrogenase complex, and branched-chain α-keto acid dehydrogenase complexes, where it catalyzes NAD⁺-dependent oxidation of dihydrolipoamide; disease-causing DLD mutations impair enzymatic activity, disrupt E2-binding affinity, and enhance ROS generation; the α-KGDH complex containing DLD also translocates to the nucleus to supply succinyl-CoA for histone succinylation, and DLD activity is specifically required for cystine deprivation-induced ferroptosis through regulation of KGDH activity and mitochondrial iron accumulation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"DLD encodes dihydrolipoamide dehydrogenase (E3), a FAD-dependent oxidoreductase that serves as the shared E3 subunit of the pyruvate dehydrogenase complex, alpha-ketoglutarate dehydrogenase complex, branched-chain alpha-keto acid dehydrogenase complex, and the glycine cleavage system, linking it to mitochondrial acetyl-CoA production and ATP generation [PMID:28579060, PMID:30717346]. Loss-of-function mutations simultaneously impair all four complexes, and compound heterozygous DLD variants cause Leigh syndrome and metabolic decompensation with residual E3 activity as low as 9–29% of normal [PMID:23290025]. Pathogenic variants additionally generate elevated reactive oxygen species, lose affinity for cognate E2 subunits, and in some cases exhibit impaired FAD cofactor retention [PMID:28579060].\",\n  \"teleology\": [\n    {\n      \"year\": 2013,\n      \"claim\": \"Establishing that specific DLD mutations are causal for Leigh syndrome resolved the genotype-phenotype link: compound heterozygous variants (p.I353T, p.G136del) reduce E3 activity to 9–29% of normal in patient fibroblasts, directly connecting DLD loss-of-function to neurometabolic disease.\",\n      \"evidence\": \"Enzymatic activity assay in patient-derived skin fibroblasts with molecular mutation analysis\",\n      \"pmids\": [\"23290025\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single-family study; broader genotype-phenotype spectrum across additional DLD alleles not established\",\n        \"Structural basis of reduced activity for these specific mutations not determined\",\n        \"Tissue-specific consequences (brain vs. liver) of partial E3 deficiency not delineated\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Comprehensive biochemical characterization established that DLD/E3 is the shared subunit of four mitochondrial multienzyme complexes and that disease-causing mutations simultaneously disable all four, while also revealing aberrant ROS generation and impaired E2 binding as additional pathomechanisms.\",\n      \"evidence\": \"Recombinant wild-type and mutant hE3 proteins assayed for enzymatic activity, ROS generation, FAD binding, and E2 interaction; corroborated in patient-derived fibroblasts\",\n      \"pmids\": [\"28579060\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"ROS generation and E2-binding loss demonstrated in vitro; relevance in intact mitochondria not confirmed\",\n        \"Whether FAD supplementation rescues activity in vivo is untested\",\n        \"Structural mechanism by which mutations simultaneously affect catalysis and ROS production is unresolved\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"DLD's dual role in both supporting oxidative metabolism and conditionally modulating ROS/RNS production was delineated, showing that its redox activity can switch between protective and damaging depending on the cellular redox state.\",\n      \"evidence\": \"Biochemical pathway analysis and inhibitor studies in cellular models\",\n      \"pmids\": [\"30717346\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Conditions governing the switch between ROS-generating and ROS-attenuating modes not fully defined\",\n        \"In vivo physiological relevance of RNS production by DLD not established\",\n        \"Whether pharmacological modulation of DLD's ROS activity is therapeutically viable is unknown\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis for how individual pathogenic mutations alter both catalysis and ROS generation, whether FAD or lipoic acid supplementation provides clinical benefit, and how tissue-specific E3 deficiency produces the heterogeneous clinical phenotypes observed in patients.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No high-resolution structures of pathogenic DLD variants available\",\n        \"No in vivo rescue experiments with cofactor supplementation reported\",\n        \"Tissue-specific metabolic consequences of DLD deficiency remain uncharacterized\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016491\", \"supporting_discovery_ids\": [0, 1, 2, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 2, 3]}\n    ],\n    \"complexes\": [\n      \"pyruvate dehydrogenase complex\",\n      \"alpha-ketoglutarate dehydrogenase complex\",\n      \"branched-chain alpha-keto acid dehydrogenase complex\",\n      \"glycine cleavage system\"\n    ],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"DLD encodes dihydrolipoyl dehydrogenase (E3), the FAD-dependent oxidoreductase that catalyzes NAD⁺-dependent oxidation of dihydrolipoamide as the shared E3 subunit of the pyruvate dehydrogenase complex, α-ketoglutarate dehydrogenase complex, branched-chain α-keto acid dehydrogenase complexes, and the glycine cleavage system, thereby occupying a central node in mitochondrial oxidative metabolism [PMID:28579060, PMID:2188967]. The α-KGDH complex containing DLD also translocates to the nucleus, where it associates with KAT2A to supply succinyl-CoA for histone H3 lysine 79 succinylation, linking DLD-dependent metabolism to epigenetic gene regulation and tumor cell proliferation [PMID:29211711]. DLD is specifically required for cystine deprivation-induced ferroptosis, functioning upstream of mitochondrial iron accumulation and lipid peroxidation through its regulation of α-KGDH activity [PMID:31931284]. Loss-of-function DLD mutations cause dihydrolipoamide dehydrogenase deficiency—manifesting as lactic acidosis, Leigh syndrome, and multi-organ pathology—through impaired enzymatic activity, disrupted E2 binding, and enhanced ROS generation [PMID:28579060, PMID:23290025].\",\n  \"teleology\": [\n    {\n      \"year\": 1990,\n      \"claim\": \"Defining the modular architecture of the E2 subunits that scaffold DLD/E3 into functional multienzyme complexes established how substrate channeling occurs within the dehydrogenase complexes and identified the E3-binding domain as the structural determinant for DLD recruitment.\",\n      \"evidence\": \"Biochemical reconstitution and domain-deletion analysis of dihydrolipoamide acyltransferases in vitro\",\n      \"pmids\": [\"2188967\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis for E3–E2 interaction at atomic resolution was not resolved\",\n        \"Regulation of DLD/E3 incorporation into different complexes in vivo was not addressed\"\n      ]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Characterizing PDK/PDP-mediated phosphorylation–dephosphorylation of the pyruvate dehydrogenase complex revealed how E3-dependent catalytic flux is regulated across metabolic states, establishing that DLD activity is indirectly controlled by isoform-specific kinase and phosphatase activities acting on E1.\",\n      \"evidence\": \"Kinase/phosphatase kinetic assays and phosphorylation-site specificity analysis of PDC regulation\",\n      \"pmids\": [\"12676647\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether analogous regulatory phosphorylation mechanisms operate on the KGDH and BCKDH complexes housing DLD was not resolved\",\n        \"Direct post-translational modifications on DLD itself were not characterized\"\n      ]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identification of novel compound heterozygous DLD mutations (p.I353T/p.G136del) causing Leigh syndrome with 9–29% residual E3 activity demonstrated that partial loss of DLD function is sufficient to cause severe neurodegeneration, bridging genotype to clinical phenotype.\",\n      \"evidence\": \"Enzymatic assay of E3 activity in patient fibroblasts with molecular confirmation of compound heterozygosity\",\n      \"pmids\": [\"23290025\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single family study; genotype–phenotype correlation across larger cohorts was not established\",\n        \"Structural consequences of these specific mutations were not resolved at atomic level\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Systematic biochemical analysis of disease-causing DLD variants revealed that pathogenic mutations not only reduce catalytic activity but also impair E2-binding affinity and enhance ROS generation, establishing that DLD dysfunction has dual consequences—metabolic insufficiency and oxidative stress—both contributing to disease pathogenesis.\",\n      \"evidence\": \"Enzymatic activity, ROS generation, FAD binding, and E2-binding affinity assays across multiple pathogenic hE3 variants\",\n      \"pmids\": [\"28579060\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether ROS generation by mutant DLD is a primary driver or secondary consequence in vivo remains unresolved\",\n        \"Tissue-specific vulnerability to DLD mutations was not mechanistically explained\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Discovery that the α-KGDH complex containing DLD translocates to the nucleus and supplies succinyl-CoA for KAT2A-mediated histone H3K79 succinylation fundamentally expanded DLD's functional scope from a metabolic enzyme to an epigenetic regulator affecting gene expression and tumor proliferation.\",\n      \"evidence\": \"Subcellular fractionation, co-immunoprecipitation, ChIP-seq, crystal structure of KAT2A–succinyl-CoA, site-directed mutagenesis, in vivo tumor growth assays\",\n      \"pmids\": [\"29211711\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Signal or mechanism directing α-KGDH nuclear import is unknown\",\n        \"Whether DLD catalytic activity is required for the nuclear function or whether DLD serves a structural role in the nuclear complex is not distinguished\",\n        \"Scope of genes regulated by this mechanism is incompletely mapped\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrating that DLD is specifically required for cystine deprivation-induced ferroptosis—through regulation of KGDH activity, mitochondrial membrane potential, and mitochondrial iron accumulation—placed DLD at a mechanistic nexus between TCA cycle metabolism and regulated cell death.\",\n      \"evidence\": \"siRNA/shRNA knockdown with cDNA rescue, lipid ROS and mitochondrial iron quantification, KGDH activity assays, and mouse xenograft models in head and neck cancer cells\",\n      \"pmids\": [\"31931284\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"How DLD/KGDH activity promotes mitochondrial iron accumulation mechanistically is unclear\",\n        \"Whether DLD's role in ferroptosis extends beyond cystine deprivation contexts or to non-cancer cells is not established\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the mechanism of α-KGDH nuclear translocation, whether DLD has direct post-translational regulatory inputs, and how DLD-dependent ROS generation versus metabolic insufficiency contribute differentially to tissue-specific pathology in DLD deficiency.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"Nuclear import signal/mechanism for the DLD-containing α-KGDH complex is unknown\",\n        \"Direct post-translational modifications of DLD itself are uncharacterized\",\n        \"Mechanistic basis for tissue-specific vulnerability in DLD deficiency is not resolved\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016491\", \"supporting_discovery_ids\": [0, 1, 3]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 2, 3]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 4, 5]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"complexes\": [\n      \"pyruvate dehydrogenase complex (PDC)\",\n      \"α-ketoglutarate dehydrogenase complex (KGDHc)\",\n      \"branched-chain α-keto acid dehydrogenase complex\",\n      \"glycine cleavage system\"\n    ],\n    \"partners\": [\n      \"DLAT\",\n      \"DLST\",\n      \"KAT2A\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}