{"gene":"ATP5IF1","run_date":"2026-04-28T17:12:37","timeline":{"discoveries":[{"year":2001,"finding":"The crystal structure of bovine IF1 (the mitochondrial ATPase inhibitory factor) was solved at 2.2 Å resolution, revealing that monomers form dimers via an antiparallel α-helical coiled coil in the C-terminal region, and dimers associate into tetramers/oligomers via coiled-coil interactions in the N-terminal inhibitory region (residues 14–47). Tetramer formation masks the inhibitory region, explaining why IF1 is inactive at higher pH values and why pH-dependent dimerization is required for binding and inhibiting the F1Fo-ATP synthase.","method":"X-ray crystallography at 2.2 Å resolution","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 — high-resolution crystal structure with mechanistic interpretation of pH-dependent oligomeric regulation","pmids":["11742976"],"is_preprint":false},{"year":2009,"finding":"IF1 functions as an endogenous inhibitor of the F1Fo-ATPase reverse (hydrolytic) activity: when mitochondrial membrane potential falls, the ATP synthase can run in reverse to hydrolyze ATP and pump protons, but IF1 binding prevents this ATP hydrolysis, thereby preserving cellular ATP at the cost of membrane potential. The protein's activity is pH-dependent—below neutrality IF1 is dimeric and inhibitory, while at higher pH it forms inactive tetramers.","method":"Biochemical review integrating prior reconstitution and structural data; functional studies in cells","journal":"Trends in biochemical sciences","confidence":"High","confidence_rationale":"Tier 2 — synthesis of multiple orthogonal biochemical and structural studies confirming IF1 mechanism","pmids":["19559621"],"is_preprint":false},{"year":2010,"finding":"Overexpression of IF1, or of its pH-insensitive H49K mutant, in cancer cells that express low endogenous IF1 inhibits the synthase activity of mitochondrial H+-ATP synthase, causes mitochondrial hyperpolarization, upregulates aerobic glycolysis, and decreases oxidative phosphorylation (Warburg phenotype). Conversely, siRNA-mediated silencing of IF1 in high-IF1 cells promotes increased oxidative phosphorylation and reduced glycolysis, demonstrating that mitochondrial IF1 content directly controls the balance between oxidative phosphorylation and glycolysis.","method":"IF1 overexpression (including pH-insensitive H49K mutant) and siRNA knockdown in cancer cell lines; measurement of oxygen consumption, lactate production, mitochondrial membrane potential, and ATP levels","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — gain- and loss-of-function with multiple metabolic readouts, including a mechanistic mutant (H49K)","pmids":["20538613"],"is_preprint":false},{"year":2010,"finding":"Phosphoproteomic analysis of functional human skeletal muscle mitochondria identified phosphorylation sites on IF1 and other inner membrane proteins, indicating that IF1 is subject to reversible phosphorylation in vivo, potentially representing a regulatory mechanism.","method":"Phosphopeptide enrichment combined with LC-MS/MS on isolated human muscle mitochondria","journal":"Molecular & cellular proteomics : MCP","confidence":"Low","confidence_rationale":"Tier 3 — single MS identification of phosphorylation site with no functional follow-up for IF1 specifically","pmids":["20833797"],"is_preprint":false},{"year":2012,"finding":"Overexpression of IF1 in colon cancer cells triggers mitochondrial hyperpolarization and production of superoxide (ROS) from mitochondria. These ROS activate the NF-κB pathway via phosphorylation-dependent IκBα degradation, driving a retrograde pro-survival transcriptional response that includes upregulation of Bcl-xL and promotion of cell proliferation. Quenching mitochondrial ROS with MitoQ abolished NF-κB activation and the IF1-mediated cellular adaptive response, establishing that the ROS-NF-κB axis is required for IF1's pro-proliferative effect.","method":"IF1 overexpression in colon cancer cells; ROS measurement; NF-κB reporter assays; IκBα phosphorylation western blot; MitoQ ROS scavenger rescue experiments; Bcl-xL expression analysis; cell proliferation assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods with pharmacological rescue establishing causal ROS-NF-κB mechanism","pmids":["22342343"],"is_preprint":false},{"year":2014,"finding":"IF1 promotes hepatocellular carcinoma (HCC) angiogenesis and metastasis by activating NF-κB signaling. Mechanistically, IF1 facilitates binding of TRAF1 to NF-κB-inducing kinase (NIK) and disrupts the TRAF2-cIAP2 complex association with NIK, thereby activating non-canonical NF-κB. Active NF-κB then binds the Snai1 promoter (confirmed by ChIP) to drive EMT, and induces VEGF expression to promote angiogenesis. IF1 is itself a direct NF-κB transcriptional target, forming a positive feedback loop between IF1 and NF-κB. Silencing IF1 attenuated EMT and invasion of HCC cells.","method":"IF1 overexpression and siRNA knockdown in HCC cells; co-immunoprecipitation of TRAF1/TRAF2/NIK complexes; chromatin immunoprecipitation (ChIP) of NF-κB at Snai1 promoter; invasion assays; VEGF measurement; in vivo xenograft models","journal":"Hepatology (Baltimore, Md.)","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (Co-IP, ChIP, KD/OE with defined phenotypes) establishing mechanistic pathway","pmids":["25042864"],"is_preprint":false}],"current_model":"ATP5IF1 (IF1) is a pH-sensitive inhibitor of the mitochondrial F1Fo-ATP synthase that, as a dimer, binds the enzyme's F1 domain to prevent reverse (hydrolytic) ATP consumption when membrane potential falls; at higher pH, IF1 forms inactive tetramers via C-terminal coiled-coil dimerization and N-terminal oligomerization that masks its inhibitory region. Beyond this canonical role, elevated IF1 expression inhibits oxidative phosphorylation and drives aerobic glycolysis (Warburg effect) in cancer cells, while simultaneously triggering mitochondrial ROS-dependent NF-κB activation that promotes proliferation, Bcl-xL-mediated survival, and—via a TRAF1/NIK mechanism and transcriptional induction of Snai1 and VEGF—epithelial-mesenchymal transition and angiogenesis in hepatocellular carcinoma, with NF-κB reciprocally transcribing IF1 to form a positive feedback loop."},"narrative":{"teleology":[{"year":2001,"claim":"Determining how pH controls IF1 activity: the crystal structure revealed that C-terminal coiled-coil dimerization is required for inhibitory competence, while N-terminal oligomerization into tetramers at higher pH masks the inhibitory region, explaining the long-observed pH switch.","evidence":"X-ray crystallography of bovine IF1 at 2.2 Å resolution","pmids":["11742976"],"confidence":"High","gaps":["No atomic-resolution structure of the IF1–F1 inhibited complex","Precise pH-sensing residues beyond H49 not fully mapped","In vivo stoichiometry of IF1 per ATP synthase complex not established"]},{"year":2010,"claim":"Establishing IF1 as a direct determinant of the Warburg phenotype: gain- and loss-of-function experiments showed that IF1 expression level controls the balance between oxidative phosphorylation and aerobic glycolysis in cancer cells, with the pH-insensitive H49K mutant confirming the mechanism operates through synthase inhibition.","evidence":"IF1 overexpression (wild-type and H49K mutant) and siRNA knockdown in cancer cell lines with metabolic flux measurements","pmids":["20538613"],"confidence":"High","gaps":["Whether IF1-driven glycolytic shift occurs in non-transformed cells remains untested","Contribution of IF1 phosphorylation to metabolic reprogramming not addressed"]},{"year":2012,"claim":"Identifying the retrograde signaling axis: IF1-induced mitochondrial hyperpolarization generates superoxide that activates NF-κB via IκBα phosphorylation and degradation, driving Bcl-xL upregulation and cell proliferation—a causal chain confirmed by ROS scavenging with MitoQ.","evidence":"IF1 overexpression in colon cancer cells; ROS quantification, NF-κB reporter assays, MitoQ rescue experiments, proliferation assays","pmids":["22342343"],"confidence":"High","gaps":["Identity of the specific mitochondrial ROS source (Complex I vs III) not resolved","Whether canonical IKK is the sole kinase mediating IκBα degradation downstream of IF1-ROS unclear"]},{"year":2014,"claim":"Extending the NF-κB axis to invasion and angiogenesis: in hepatocellular carcinoma, IF1 activates non-canonical NF-κB by promoting TRAF1–NIK association and disrupting TRAF2–cIAP2 control of NIK, leading to NF-κB-dependent transcription of Snai1 (EMT) and VEGF (angiogenesis), with NF-κB reciprocally transcribing IF1 to form a positive feedback loop.","evidence":"Co-immunoprecipitation of TRAF1/TRAF2/NIK complexes; ChIP of NF-κB at Snai1 promoter; siRNA knockdown; in vivo xenograft models in HCC cells","pmids":["25042864"],"confidence":"High","gaps":["How mitochondrial IF1 mechanistically promotes cytoplasmic TRAF1–NIK assembly is unknown","Whether the IF1–NF-κB feedback loop operates in non-hepatic cancers not tested","Direct IF1 promoter NF-κB binding site not mapped at nucleotide resolution"]},{"year":null,"claim":"The mechanism by which a mitochondrial matrix/inner-membrane protein (IF1) transmits a signal to cytoplasmic NF-κB pathway components beyond ROS remains unresolved, and the physiological relevance of IF1 phosphorylation for regulating its inhibitory or signaling functions is uncharacterized.","evidence":"","pmids":[],"confidence":"Low","gaps":["No reconstituted system connecting IF1 to TRAF1/NIK outside of co-IP in cells","Functional significance of IF1 phosphorylation sites detected by MS not validated","In vivo genetic models (conditional knockout) for IF1 signaling roles not reported in timeline"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,2]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,1,2,4]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[1,2]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[4,5]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[2,4,5]}],"complexes":["F1Fo-ATP synthase"],"partners":["ATP5F1A","TRAF1","NIK"],"other_free_text":[]},"mechanistic_narrative":"ATP5IF1 (IF1) is a pH-sensitive endogenous inhibitor of the mitochondrial F1Fo-ATP synthase that prevents wasteful ATP hydrolysis when the mitochondrial membrane potential collapses. Structurally, IF1 monomers form dimers via a C-terminal antiparallel α-helical coiled coil; at neutral-to-alkaline pH, dimers further oligomerize into inactive tetramers that mask the N-terminal inhibitory region (residues 14–47), rendering the protein unable to bind the F1 domain [PMID:11742976, PMID:19559621]. Beyond its canonical protective role, elevated IF1 expression inhibits ATP synthase activity, causes mitochondrial hyperpolarization, and drives a metabolic shift from oxidative phosphorylation to aerobic glycolysis; the resulting mitochondrial ROS production activates NF-κB signaling—via IκBα degradation and a TRAF1/NIK-dependent non-canonical branch—upregulating Bcl-xL, Snai1, and VEGF to promote cell proliferation, epithelial–mesenchymal transition, and angiogenesis in cancer cells [PMID:20538613, PMID:22342343, PMID:25042864]. NF-κB reciprocally drives IF1 transcription, establishing a positive feedback loop that sustains the oncogenic phenotype [PMID:25042864]."},"prefetch_data":{"uniprot":{"accession":"Q9UII2","full_name":"ATPase inhibitor, mitochondrial","aliases":["ATP synthase F1 subunit epsilon","Inhibitor of F(1)F(o)-ATPase","IF(1)","IF1"],"length_aa":106,"mass_kda":12.2,"function":"Endogenous F(1)F(o)-ATPase inhibitor limiting ATP depletion when the mitochondrial membrane potential falls below a threshold and the F(1)F(o)-ATP synthase starts hydrolyzing ATP to pump protons out of the mitochondrial matrix (PubMed:35926043). Required to avoid the consumption of cellular ATP when the F(1)F(o)-ATP synthase enzyme acts as an ATP hydrolase. Indirectly acts as a regulator of heme synthesis in erythroid tissues: regulates heme synthesis by modulating the mitochondrial pH and redox potential, allowing FECH to efficiently catalyze the incorporation of iron into protoporphyrin IX to produce heme","subcellular_location":"Mitochondrion","url":"https://www.uniprot.org/uniprotkb/Q9UII2/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ATP5IF1","classification":"Not Classified","n_dependent_lines":38,"n_total_lines":1208,"dependency_fraction":0.03145695364238411},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ATP5IF1","total_profiled":1310},"omim":[],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Mitochondria","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/ATP5IF1"},"hgnc":{"alias_symbol":["ATPI","IP","ATPIP","MGC1167","MGC8898"],"prev_symbol":["ATPIF1"]},"alphafold":{"accession":"Q9UII2","domains":[{"cath_id":"1.20.5","chopping":"44-104","consensus_level":"medium","plddt":94.6848,"start":44,"end":104}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UII2","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UII2-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UII2-F1-predicted_aligned_error_v6.png","plddt_mean":79.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ATP5IF1","jax_strain_url":"https://www.jax.org/strain/search?query=ATP5IF1"},"sequence":{"accession":"Q9UII2","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9UII2.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9UII2/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UII2"}},"corpus_meta":[{"pmid":"9060447","id":"PMC_9060447","title":"Mig 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cells to a Warburg phenotype.","date":"2010","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/20538613","citation_count":181,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"30833792","id":"PMC_30833792","title":"A protein-interaction network of interferon-stimulated genes extends the innate immune system landscape.","date":"2019","source":"Nature immunology","url":"https://pubmed.ncbi.nlm.nih.gov/30833792","citation_count":159,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"32877691","id":"PMC_32877691","title":"A High-Density Human Mitochondrial Proximity Interaction Network.","date":"2020","source":"Cell metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/32877691","citation_count":148,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"36217030","id":"PMC_36217030","title":"A comprehensive SARS-CoV-2-human protein-protein interactome reveals COVID-19 pathobiology and potential host therapeutic targets.","date":"2022","source":"Nature biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/36217030","citation_count":140,"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":"11742976","id":"PMC_11742976","title":"The structure of bovine IF(1), the regulatory subunit of mitochondrial F-ATPase.","date":"2001","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/11742976","citation_count":121,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"19559621","id":"PMC_19559621","title":"IF(1): setting the pace of the F(1)F(o)-ATP synthase.","date":"2009","source":"Trends in biochemical sciences","url":"https://pubmed.ncbi.nlm.nih.gov/19559621","citation_count":120,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"25042864","id":"PMC_25042864","title":"Reciprocal activation between ATPase inhibitory factor 1 and NF-κB drives hepatocellular carcinoma angiogenesis and metastasis.","date":"2014","source":"Hepatology (Baltimore, Md.)","url":"https://pubmed.ncbi.nlm.nih.gov/25042864","citation_count":117,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":48165,"output_tokens":261,"usd":0.074205},"stage2":{"model":"","input_tokens":0,"output_tokens":0,"usd":0.0},"total_usd":0.292621,"stage1_batch_id":"msgbatch_01TqNM6p6FsoMBT2jzQTwKBr","stage2_batch_id":"msgbatch_01Ya473eco8sTHbvRymQaU8o","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":60661,"output_tokens":2656,"usd":0.110911},"round2_rules_fired":"R1","round2_stage2":{"model":"claude-opus-4-6","input_tokens":5504,"output_tokens":1766,"usd":0.107505}},"stage1_raw":"Looking through the abstracts, I need to find papers about ATP5IF1 (also known as IF1, the inhibitory factor 1 of mitochondrial ATP synthase). \n\nAfter carefully reviewing all 100 abstracts, none of them describe mechanistic findings about ATP5IF1 (the mitochondrial ATPase inhibitory factor 1). The corpus is overwhelmingly about:\n- CXCL10/IP-10 (a chemokine)\n- IP3 receptors (inositol trisphosphate receptors)\n- IP prostanoid receptors (prostacyclin receptors)\n- Various unrelated proteins/methods\n\nThe \"IP\" and \"ATP\" abbreviations in some papers do not correspond to ATP5IF1. Papers about AtpI (bacterial ATP synthase assembly factor) describe bacterial/plant proteins that are not orthologs of human ATP5IF1 (which is an endogenous inhibitor of F1Fo-ATP synthase, not an assembly factor).\n\n```json\n{\n  \"discoveries\": [],\n  \"current_model\": \"No mechanistic findings in the available literature.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nLooking at the corpus, I need to identify papers about ATP5IF1 (ATPase Inhibitory Factor 1, also known as IF1 - the mitochondrial ATP synthase inhibitor protein).\n\nMost of the retrieved papers (100 papers) are about completely unrelated genes:\n- IP-10/CXCL10 (a chemokine) - papers [1-2, 9, 11, 14-15, 17-18, 21, 23, 31-32, 43-44, 47, 52, 55, 57, 65-67, 74, 79, 82-83, 85, 88, 91, 93, 100]\n- IP3 receptors (inositol trisphosphate receptors) - papers [3, 5, 7, 10, 12, 19-20, 22, 24-28, 33, 35-36, 38-40, 42, 45-46, 50-51, 54, 56, 58-59, 62, 68, 72-73, 76-77, 80-81, 84, 86-87, 90, 94, 99]\n- IP prostanoid receptors - papers [4, 6, 8, 37, 49, 53, 60, 63, 69, 89, 95, 98]\n- IP6 (inositol hexakisphosphate) - papers [16, 48, 70]\n- AtpI (bacterial/plant) - papers [41, 61, 75, 97] — these are prokaryotic/plant AtpI, not the mammalian ATP5IF1\n- Other unrelated topics - papers [13, 29-30, 34, 64, 71, 78, 92, 96]\n\nFrom the gene2pubmed-curated papers, the relevant ones about ATP5IF1 (IF1) are:\n- PMID:22342343 (Formentini et al., 2012) - IF1 overexpression, ROS, NFκB\n- PMID:20538613 (Sánchez-Cenizo et al., 2010) - IF1 in cancer, Warburg effect\n- PMID:11742976 (Cabezón et al., 2001) - structure of bovine IF1\n- PMID:19559621 (Campanella et al., 2009) - IF1 review\n- PMID:25042864 (Song et al., 2014) - IF1, NF-κB, HCC\n- PMID:20833797 (Zhao et al., 2010) - phosphoproteomics, IF1 phosphorylation mentioned\n- Various interactome papers (PMID:16169070, 28514442, 26496610, 33961781, 32296183, 34079125) - identify IF1 interactions\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2001,\n      \"finding\": \"The crystal structure of bovine IF1 (the mitochondrial ATPase inhibitory factor) was solved at 2.2 Å resolution, revealing that monomers form dimers via an antiparallel α-helical coiled coil in the C-terminal region, and dimers associate into tetramers/oligomers via coiled-coil interactions in the N-terminal inhibitory region (residues 14–47). Tetramer formation masks the inhibitory region, explaining why IF1 is inactive at higher pH values and why pH-dependent dimerization is required for binding and inhibiting the F1Fo-ATP synthase.\",\n      \"method\": \"X-ray crystallography at 2.2 Å resolution\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution crystal structure with mechanistic interpretation of pH-dependent oligomeric regulation\",\n      \"pmids\": [\"11742976\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"IF1 functions as an endogenous inhibitor of the F1Fo-ATPase reverse (hydrolytic) activity: when mitochondrial membrane potential falls, the ATP synthase can run in reverse to hydrolyze ATP and pump protons, but IF1 binding prevents this ATP hydrolysis, thereby preserving cellular ATP at the cost of membrane potential. The protein's activity is pH-dependent—below neutrality IF1 is dimeric and inhibitory, while at higher pH it forms inactive tetramers.\",\n      \"method\": \"Biochemical review integrating prior reconstitution and structural data; functional studies in cells\",\n      \"journal\": \"Trends in biochemical sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — synthesis of multiple orthogonal biochemical and structural studies confirming IF1 mechanism\",\n      \"pmids\": [\"19559621\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Overexpression of IF1, or of its pH-insensitive H49K mutant, in cancer cells that express low endogenous IF1 inhibits the synthase activity of mitochondrial H+-ATP synthase, causes mitochondrial hyperpolarization, upregulates aerobic glycolysis, and decreases oxidative phosphorylation (Warburg phenotype). Conversely, siRNA-mediated silencing of IF1 in high-IF1 cells promotes increased oxidative phosphorylation and reduced glycolysis, demonstrating that mitochondrial IF1 content directly controls the balance between oxidative phosphorylation and glycolysis.\",\n      \"method\": \"IF1 overexpression (including pH-insensitive H49K mutant) and siRNA knockdown in cancer cell lines; measurement of oxygen consumption, lactate production, mitochondrial membrane potential, and ATP levels\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — gain- and loss-of-function with multiple metabolic readouts, including a mechanistic mutant (H49K)\",\n      \"pmids\": [\"20538613\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Phosphoproteomic analysis of functional human skeletal muscle mitochondria identified phosphorylation sites on IF1 and other inner membrane proteins, indicating that IF1 is subject to reversible phosphorylation in vivo, potentially representing a regulatory mechanism.\",\n      \"method\": \"Phosphopeptide enrichment combined with LC-MS/MS on isolated human muscle mitochondria\",\n      \"journal\": \"Molecular & cellular proteomics : MCP\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single MS identification of phosphorylation site with no functional follow-up for IF1 specifically\",\n      \"pmids\": [\"20833797\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Overexpression of IF1 in colon cancer cells triggers mitochondrial hyperpolarization and production of superoxide (ROS) from mitochondria. These ROS activate the NF-κB pathway via phosphorylation-dependent IκBα degradation, driving a retrograde pro-survival transcriptional response that includes upregulation of Bcl-xL and promotion of cell proliferation. Quenching mitochondrial ROS with MitoQ abolished NF-κB activation and the IF1-mediated cellular adaptive response, establishing that the ROS-NF-κB axis is required for IF1's pro-proliferative effect.\",\n      \"method\": \"IF1 overexpression in colon cancer cells; ROS measurement; NF-κB reporter assays; IκBα phosphorylation western blot; MitoQ ROS scavenger rescue experiments; Bcl-xL expression analysis; cell proliferation assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods with pharmacological rescue establishing causal ROS-NF-κB mechanism\",\n      \"pmids\": [\"22342343\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"IF1 promotes hepatocellular carcinoma (HCC) angiogenesis and metastasis by activating NF-κB signaling. Mechanistically, IF1 facilitates binding of TRAF1 to NF-κB-inducing kinase (NIK) and disrupts the TRAF2-cIAP2 complex association with NIK, thereby activating non-canonical NF-κB. Active NF-κB then binds the Snai1 promoter (confirmed by ChIP) to drive EMT, and induces VEGF expression to promote angiogenesis. IF1 is itself a direct NF-κB transcriptional target, forming a positive feedback loop between IF1 and NF-κB. Silencing IF1 attenuated EMT and invasion of HCC cells.\",\n      \"method\": \"IF1 overexpression and siRNA knockdown in HCC cells; co-immunoprecipitation of TRAF1/TRAF2/NIK complexes; chromatin immunoprecipitation (ChIP) of NF-κB at Snai1 promoter; invasion assays; VEGF measurement; in vivo xenograft models\",\n      \"journal\": \"Hepatology (Baltimore, Md.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (Co-IP, ChIP, KD/OE with defined phenotypes) establishing mechanistic pathway\",\n      \"pmids\": [\"25042864\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ATP5IF1 (IF1) is a pH-sensitive inhibitor of the mitochondrial F1Fo-ATP synthase that, as a dimer, binds the enzyme's F1 domain to prevent reverse (hydrolytic) ATP consumption when membrane potential falls; at higher pH, IF1 forms inactive tetramers via C-terminal coiled-coil dimerization and N-terminal oligomerization that masks its inhibitory region. Beyond this canonical role, elevated IF1 expression inhibits oxidative phosphorylation and drives aerobic glycolysis (Warburg effect) in cancer cells, while simultaneously triggering mitochondrial ROS-dependent NF-κB activation that promotes proliferation, Bcl-xL-mediated survival, and—via a TRAF1/NIK mechanism and transcriptional induction of Snai1 and VEGF—epithelial-mesenchymal transition and angiogenesis in hepatocellular carcinoma, with NF-κB reciprocally transcribing IF1 to form a positive feedback loop.\"\n}\n```","stage2_raw":"\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"ATP5IF1 (IF1) is a pH-sensitive endogenous inhibitor of the mitochondrial F1Fo-ATP synthase that prevents wasteful ATP hydrolysis when the mitochondrial membrane potential collapses. Structurally, IF1 monomers form dimers via a C-terminal antiparallel α-helical coiled coil; at neutral-to-alkaline pH, dimers further oligomerize into inactive tetramers that mask the N-terminal inhibitory region (residues 14–47), rendering the protein unable to bind the F1 domain [PMID:11742976, PMID:19559621]. Beyond its canonical protective role, elevated IF1 expression inhibits ATP synthase activity, causes mitochondrial hyperpolarization, and drives a metabolic shift from oxidative phosphorylation to aerobic glycolysis; the resulting mitochondrial ROS production activates NF-κB signaling—via IκBα degradation and a TRAF1/NIK-dependent non-canonical branch—upregulating Bcl-xL, Snai1, and VEGF to promote cell proliferation, epithelial–mesenchymal transition, and angiogenesis in cancer cells [PMID:20538613, PMID:22342343, PMID:25042864]. NF-κB reciprocally drives IF1 transcription, establishing a positive feedback loop that sustains the oncogenic phenotype [PMID:25042864].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Determining how pH controls IF1 activity: the crystal structure revealed that C-terminal coiled-coil dimerization is required for inhibitory competence, while N-terminal oligomerization into tetramers at higher pH masks the inhibitory region, explaining the long-observed pH switch.\",\n      \"evidence\": \"X-ray crystallography of bovine IF1 at 2.2 Å resolution\",\n      \"pmids\": [\"11742976\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No atomic-resolution structure of the IF1–F1 inhibited complex\",\n        \"Precise pH-sensing residues beyond H49 not fully mapped\",\n        \"In vivo stoichiometry of IF1 per ATP synthase complex not established\"\n      ]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Establishing IF1 as a direct determinant of the Warburg phenotype: gain- and loss-of-function experiments showed that IF1 expression level controls the balance between oxidative phosphorylation and aerobic glycolysis in cancer cells, with the pH-insensitive H49K mutant confirming the mechanism operates through synthase inhibition.\",\n      \"evidence\": \"IF1 overexpression (wild-type and H49K mutant) and siRNA knockdown in cancer cell lines with metabolic flux measurements\",\n      \"pmids\": [\"20538613\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether IF1-driven glycolytic shift occurs in non-transformed cells remains untested\",\n        \"Contribution of IF1 phosphorylation to metabolic reprogramming not addressed\"\n      ]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identifying the retrograde signaling axis: IF1-induced mitochondrial hyperpolarization generates superoxide that activates NF-κB via IκBα phosphorylation and degradation, driving Bcl-xL upregulation and cell proliferation—a causal chain confirmed by ROS scavenging with MitoQ.\",\n      \"evidence\": \"IF1 overexpression in colon cancer cells; ROS quantification, NF-κB reporter assays, MitoQ rescue experiments, proliferation assays\",\n      \"pmids\": [\"22342343\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Identity of the specific mitochondrial ROS source (Complex I vs III) not resolved\",\n        \"Whether canonical IKK is the sole kinase mediating IκBα degradation downstream of IF1-ROS unclear\"\n      ]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Extending the NF-κB axis to invasion and angiogenesis: in hepatocellular carcinoma, IF1 activates non-canonical NF-κB by promoting TRAF1–NIK association and disrupting TRAF2–cIAP2 control of NIK, leading to NF-κB-dependent transcription of Snai1 (EMT) and VEGF (angiogenesis), with NF-κB reciprocally transcribing IF1 to form a positive feedback loop.\",\n      \"evidence\": \"Co-immunoprecipitation of TRAF1/TRAF2/NIK complexes; ChIP of NF-κB at Snai1 promoter; siRNA knockdown; in vivo xenograft models in HCC cells\",\n      \"pmids\": [\"25042864\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"How mitochondrial IF1 mechanistically promotes cytoplasmic TRAF1–NIK assembly is unknown\",\n        \"Whether the IF1–NF-κB feedback loop operates in non-hepatic cancers not tested\",\n        \"Direct IF1 promoter NF-κB binding site not mapped at nucleotide resolution\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The mechanism by which a mitochondrial matrix/inner-membrane protein (IF1) transmits a signal to cytoplasmic NF-κB pathway components beyond ROS remains unresolved, and the physiological relevance of IF1 phosphorylation for regulating its inhibitory or signaling functions is uncharacterized.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No reconstituted system connecting IF1 to TRAF1/NIK outside of co-IP in cells\",\n        \"Functional significance of IF1 phosphorylation sites detected by MS not validated\",\n        \"In vivo genetic models (conditional knockout) for IF1 signaling roles not reported in timeline\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 1, 2, 4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4, 5]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [2, 4, 5]}\n    ],\n    \"complexes\": [\n      \"F1Fo-ATP synthase\"\n    ],\n    \"partners\": [\n      \"ATP5F1A\",\n      \"TRAF1\",\n      \"NIK\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}