{"gene":"PC","run_date":"2026-04-29T11:37:58","timeline":{"discoveries":[{"year":1979,"finding":"Human protein C was isolated from plasma and shown to be a vitamin K-dependent zymogen composed of a disulfide-linked light chain (Mr ~21,000) and heavy chain (Mr ~41,000). Activation by alpha-thrombin produces a serine protease with amidolytic and anticoagulant activity through limited proteolysis of the heavy chain, with the active-site serine residing in the heavy chain.","method":"Protein purification (barium citrate adsorption, DEAE-Sephadex, dextran sulfate agarose chromatography), SDS-PAGE, NH2-terminal sequencing, DFP active-site labeling, clotting assays","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 1 — foundational biochemical reconstitution and active-site characterization with multiple orthogonal methods","pmids":["468991"],"is_preprint":false},{"year":1984,"finding":"Cloning of human protein C cDNA established that the protein is synthesized as a single-chain precursor containing the light chain and heavy chain connected by a Lys-Arg dipeptide; post-translational cleavage of this dipeptide and disulfide bond formation generate the mature two-chain plasma form. The catalytic domain shows high sequence identity with prothrombin, factor IX, and factor X.","method":"Lambda gt11 cDNA library screening with anti-protein C antibody, DNA sequencing (dideoxy), amino acid sequence analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — primary cDNA cloning and sequencing establishing biosynthetic mechanism","pmids":["6589623"],"is_preprint":false},{"year":1985,"finding":"The human protein C gene spans ~11 kilobases and consists of eight exons and seven introns encoding a preproleader sequence, light chain, Lys-Arg connecting dipeptide, and heavy chain (serine protease catalytic domain). Intron positions are conserved with factor IX, indicating recent gene duplication within the vitamin K-dependent serine protease family.","method":"Genomic library screening, dideoxy sequencing of overlapping lambda phage clones spanning 11 kb","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — complete gene structure determination","pmids":["2991887"],"is_preprint":false},{"year":1986,"finding":"Detailed genomic analysis revealed that the human protein C gene has nine exons and eight introns spanning at least 11.2 kb, with two EGF-homology regions (amino acids 46–91 and 92–136) each precisely delimited by introns — a domain organization shared exactly with factor IX and tissue plasminogen activator, demonstrating modular exon shuffling in the coagulation protease family.","method":"Isolation of overlapping phage genomic clones, complete sequence determination, intron/exon boundary mapping","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — complete gene structure with evolutionary analysis replicated in independent study","pmids":["3511471"],"is_preprint":false},{"year":1989,"finding":"Protein C is activated on endothelial cell surfaces by thrombin bound to thrombomodulin; activated protein C (APC) then functions as an anticoagulant serine protease that inactivates factors Va and VIIIa, and protein S serves as a cofactor for APC. This established the protein C anticoagulant pathway as a key regulatory system for blood coagulation.","method":"Biochemical reconstitution with purified components, activity assays, cofactor studies","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — reconstituted biochemical pathway, highly cited foundational review synthesizing experimental work","pmids":["2538457"],"is_preprint":false},{"year":1991,"finding":"APC inactivates human factor VIIIa by proteolytic cleavage within the A1 and A2 subunits of the heavy chain at Arg336 and Arg562 (with a third site at Arg740). Cleavage at Arg562 correlates most closely with loss of cofactor activity and promotes dissociation of the A2 domain from the A1/light chain dimer, establishing a two-step mechanism for factor VIII inactivation.","method":"In vitro proteolysis with purified APC, SDS-PAGE fragment analysis, NH2-terminal sequencing, anti-A2 monoclonal antibody reactivity, gel filtration","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — reconstituted in vitro proteolysis with site identification and functional correlation","pmids":["1939075"],"is_preprint":false},{"year":1991,"finding":"Genetic defects causing hereditary protein C deficiency type I in Dutch families are heterogeneous point mutations throughout the protein C gene; six mutations recur in multiple families, with the most frequent showing a founder effect. This established the molecular basis of thrombosis risk from protein C haploinsufficiency.","method":"DNA sequencing of protein C gene in 40 probands, mutation analysis","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — systematic genetic characterization across 40 families","pmids":["1868249"],"is_preprint":false},{"year":1994,"finding":"APC inactivates human factor Va on phospholipid membranes through sequential cleavages at Arg306, Arg506, Arg679, and Lys994 in the heavy chain. Cleavage at Arg506 precedes and is required for cleavage at Arg306 (the critical inactivating cut), and membrane binding is absolutely required for efficient inactivation — membrane-free factor Va retains ~80% cofactor activity after 2 h of APC treatment.","method":"In vitro proteolysis with purified components and PCPS vesicles, SDS-PAGE, NH2-terminal sequencing of fragments, functional cofactor activity assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — reconstituted in vitro system with site-specific cleavage mapping and functional readout","pmids":["7989361"],"is_preprint":false},{"year":1996,"finding":"The 2.8 Å crystal structure of Gla-domainless APC revealed: (1) the light chain comprises two EGF-like domains arranged at ~80° to each other; (2) the catalytic domain is trypsin-like but contains a large insertion loop at the active site edge, a third helical segment, a prominent cationic patch (analogous to thrombin's anion-binding exosite I), and a Ca²⁺-binding site; (3) the S2 and S4 subsites are more polar than in factor Xa or thrombin, explaining APC's distinct substrate specificity.","method":"X-ray crystallography at 2.8 Å resolution","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with functional implications for substrate specificity","pmids":["9003757"],"is_preprint":false},{"year":2002,"finding":"APC uses the endothelial cell protein C receptor (EPCR) as a coreceptor to cleave protease-activated receptor 1 (PAR1) on endothelial cells, triggering cytoprotective gene expression including selective induction of MCP-1. This established that PAR1 is the signaling receptor for the EPCR-dependent APC pathway and distinguishes APC's anti-inflammatory signaling from its anticoagulant functions.","method":"Gene profiling of APC-stimulated endothelial cells, PAR1/PAR2 receptor-specific assays, EPCR blocking studies","journal":"Science (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 2 — receptor identification with gene profiling and receptor-blocking experiments, highly cited","pmids":["12052963"],"is_preprint":false},{"year":2003,"finding":"APC directly prevents apoptosis in hypoxic human brain endothelium through transcriptional inhibition of p53, normalization of the Bax/Bcl-2 ratio, and reduction of caspase-3 signaling. This cytoprotection requires both EPCR and PAR-1, and in vivo neuroprotection in a mouse stroke model was EPCR-dependent and independent of APC's anticoagulant activity.","method":"Hypoxia cell model, gene/protein expression analysis (p53, Bax, Bcl-2, caspase-3), EPCR/PAR-1 blocking antibodies, EPCR-deficient mouse stroke model","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods in vitro and in vivo, receptor requirement established","pmids":["12563316"],"is_preprint":false},{"year":2004,"finding":"Thrombomodulin on endothelial cell surfaces acts as the critical cofactor for thrombin-mediated protein C activation; EPCR further amplifies this activation. APC then exerts anticoagulant effects by degrading FVa and FVIIIa on negatively charged phospholipid membranes with protein S as cofactor, and separately exerts anti-inflammatory/antiapoptotic effects via EPCR-PAR1 signaling. These functions are integrated to maintain hemostatic homeostasis.","method":"Review synthesizing biochemical, cell biology, and mouse genetic studies","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"High","confidence_rationale":"Tier 2 — synthesis of replicated experimental findings across multiple labs","pmids":["15178554"],"is_preprint":false},{"year":2005,"finding":"APC mediates endothelial barrier enhancement through EPCR ligation followed by transactivation of sphingosine 1-phosphate receptor 1 (S1P1), leading to Rac1 GTPase activation, cortical actin polymerization, and increased myosin light chain phosphorylation. Co-immunoprecipitation showed EPCR-S1P1 interaction upon APC treatment; S1P1 siRNA silencing significantly reduced APC barrier protection.","method":"Transendothelial electrical resistance measurements, Rac1 activity assays, co-immunoprecipitation, siRNA knockdown of S1P1, EPCR-blocking antibody, cortical actin imaging","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods establishing novel receptor transactivation mechanism","pmids":["15710622"],"is_preprint":false},{"year":2005,"finding":"APC cleaves PAR1 on endothelial cells in an EPCR-dependent manner but is ~10,000-fold less potent than thrombin at PAR1 cleavage. Both APC and thrombin trigger PAR1-dependent gene induction (antiapoptotic and chemokine genes), but at physiological concentrations APC does not significantly contribute to PAR1 cleavage beyond that of thrombin. APC also cleaves PAR2 via canonical cleavage, though PAR1 remains dominant for APC signaling even when PAR2 is upregulated.","method":"PAR1 cleavage kinetics on endothelial cell surfaces, EPCR antibody blocking, gene expression analysis, PAR1⁻/⁻ mouse studies","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — quantitative receptor kinetics with genetic validation","pmids":["15665002","15769747"],"is_preprint":false},{"year":2005,"finding":"Structural and molecular recognition analysis of the protein C system established that protein S is an essential cofactor for APC-mediated degradation of FVIIIa and FVa on phospholipid membranes, and that intact factor V (in addition to protein S) is required for efficient FVIIIa degradation, revealing FV as a Janus-faced protein with both procoagulant and anticoagulant potential.","method":"Review integrating biochemical reconstitution, structural data (3D structures of protein C system components), and mutagenesis studies","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"High","confidence_rationale":"Tier 1–2 — synthesis of structural and biochemical reconstitution data across multiple labs","pmids":["15860736"],"is_preprint":false},{"year":2007,"finding":"In diabetic mice, thrombomodulin-dependent APC formation is reduced, and this reduction is causally linked to nephropathy. APC prevents glucose-induced apoptosis in glomerular endothelial cells and podocytes via modulation of the mitochondrial apoptosis pathway through PAR-1 and EPCR. Maintaining high APC levels during long-term diabetes protects against nephropathy, establishing the thrombomodulin-PC-EPCR axis as a protective pathway in diabetic end-organ damage.","method":"Diabetic mouse models (thrombomodulin-deficient and APC-overexpressing), glomerular apoptosis assays, endothelial cell and podocyte culture with glucose stress, PAR-1/EPCR inhibition","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 — in vivo genetic models combined with in vitro mechanistic studies","pmids":["17982464"],"is_preprint":false}],"current_model":"Protein C (PC/PROC) is a vitamin K-dependent plasma zymogen that circulates as a disulfide-linked two-chain glycoprotein; it is activated to the serine protease APC by thrombin bound to endothelial thrombomodulin (amplified by EPCR), whereupon APC exerts anticoagulant activity by sequentially cleaving and inactivating factor Va (at Arg506 then Arg306/Arg679 on phospholipid membranes, requiring protein S as cofactor) and factor VIIIa (at Arg562 then Arg336, causing A2 domain dissociation), and separately exerts cytoprotective/anti-inflammatory signaling by binding EPCR and cleaving PAR1 (and PAR2) on endothelial cells, activating Rac1 via S1P1 transactivation to enhance barrier function and suppressing p53-mediated apoptosis through transcriptional mechanisms."},"narrative":{"teleology":[],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":[],"partners":[],"other_free_text":[]},"mechanistic_narrative":"Insufficient on-target evidence to synthesize a narrative — discovery timeline does not match the canonical PC protein."},"prefetch_data":{"uniprot":{"accession":"P11498","full_name":"Pyruvate carboxylase, mitochondrial","aliases":["Pyruvic carboxylase","PCB"],"length_aa":1178,"mass_kda":129.6,"function":"Pyruvate carboxylase catalyzes a 2-step reaction, involving the ATP-dependent carboxylation of the covalently attached biotin in the first step and the transfer of the carboxyl group to pyruvate in the second. Catalyzes in a tissue specific manner, the initial reactions of glucose (liver, kidney) and lipid (adipose tissue, liver, brain) synthesis from pyruvate","subcellular_location":"Mitochondrion matrix","url":"https://www.uniprot.org/uniprotkb/P11498/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PC","classification":"Not Classified","n_dependent_lines":290,"n_total_lines":1208,"dependency_fraction":0.24006622516556292},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/PC","total_profiled":1310},"omim":[{"mim_id":"621545","title":"GPN-LOOP GTPase 3; GPN3","url":"https://www.omim.org/entry/621545"},{"mim_id":"621544","title":"GPN-LOOP GTPase 2; GPN2","url":"https://www.omim.org/entry/621544"},{"mim_id":"621443","title":"LIM DOMAIN-CONTAINING PROTEIN 2; LIMD2","url":"https://www.omim.org/entry/621443"},{"mim_id":"621441","title":"SPERMATOGENESIS-ASSOCIATED PROTEIN 32; SPATA32","url":"https://www.omim.org/entry/621441"},{"mim_id":"621230","title":"FOLLICULAR LYMPHOMA, SUSCEPTIBILITY TO, 2; FL2","url":"https://www.omim.org/entry/621230"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Mitochondria","reliability":"Enhanced"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"liver","ntpm":182.1}],"url":"https://www.proteinatlas.org/search/PC"},"hgnc":{"alias_symbol":["PCB"],"prev_symbol":[]},"alphafold":{"accession":"P11498","domains":[{"cath_id":"3.40.50.20","chopping":"38-139","consensus_level":"high","plddt":95.3449,"start":38,"end":139},{"cath_id":"3.30.1490.20","chopping":"177-236","consensus_level":"high","plddt":82.878,"start":177,"end":236},{"cath_id":"3.30.470.20","chopping":"240-487","consensus_level":"medium","plddt":93.5015,"start":240,"end":487},{"cath_id":"3.20.20.70","chopping":"565-846","consensus_level":"medium","plddt":96.1378,"start":565,"end":846},{"cath_id":"1.10.472.90","chopping":"859-967","consensus_level":"high","plddt":90.303,"start":859,"end":967},{"cath_id":"2.40.50.100","chopping":"1110-1176","consensus_level":"high","plddt":85.2703,"start":1110,"end":1176}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P11498","model_url":"https://alphafold.ebi.ac.uk/files/AF-P11498-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P11498-F1-predicted_aligned_error_v6.png","plddt_mean":90.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PC","jax_strain_url":"https://www.jax.org/strain/search?query=PC"},"sequence":{"accession":"P11498","fasta_url":"https://rest.uniprot.org/uniprotkb/P11498.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P11498/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P11498"}},"corpus_meta":[{"pmid":"9539012","id":"PMC_9539012","title":"Stepping 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medicine","url":"https://pubmed.ncbi.nlm.nih.gov/17982464","citation_count":326,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"15710622","id":"PMC_15710622","title":"Activated protein C mediates novel lung endothelial barrier enhancement: role of sphingosine 1-phosphate receptor transactivation.","date":"2005","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/15710622","citation_count":314,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"17048007","id":"PMC_17048007","title":"Association of warfarin dose with genes involved in its action and metabolism.","date":"2006","source":"Human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/17048007","citation_count":299,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"15178554","id":"PMC_15178554","title":"Thrombomodulin-protein C-EPCR system: integrated to regulate coagulation and inflammation.","date":"2004","source":"Arteriosclerosis, thrombosis, and vascular biology","url":"https://pubmed.ncbi.nlm.nih.gov/15178554","citation_count":298,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"21900206","id":"PMC_21900206","title":"A directed protein interaction network for investigating intracellular signal transduction.","date":"2011","source":"Science signaling","url":"https://pubmed.ncbi.nlm.nih.gov/21900206","citation_count":258,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"15860736","id":"PMC_15860736","title":"Regulation of blood coagulation by the protein C anticoagulant pathway: novel insights into structure-function relationships and molecular recognition.","date":"2005","source":"Arteriosclerosis, thrombosis, and vascular biology","url":"https://pubmed.ncbi.nlm.nih.gov/15860736","citation_count":246,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"3511471","id":"PMC_3511471","title":"Evolution and organization of the human protein C gene.","date":"1986","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/3511471","citation_count":198,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"9003757","id":"PMC_9003757","title":"The 2.8 A crystal structure of Gla-domainless activated protein C.","date":"1996","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/9003757","citation_count":197,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"6589623","id":"PMC_6589623","title":"Characterization of a cDNA coding for human protein C.","date":"1984","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/6589623","citation_count":183,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"1939075","id":"PMC_1939075","title":"Activated protein C-catalyzed inactivation of human factor VIII and factor VIIIa. Identification of cleavage sites and correlation of proteolysis with cofactor activity.","date":"1991","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/1939075","citation_count":169,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"19913121","id":"PMC_19913121","title":"Gene-centric association signals for lipids and apolipoproteins identified via the HumanCVD BeadChip.","date":"2009","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/19913121","citation_count":164,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"15769747","id":"PMC_15769747","title":"Protease-activated receptor-1 signaling by activated protein C in cytokine-perturbed endothelial cells is distinct from thrombin signaling.","date":"2005","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/15769747","citation_count":163,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"15665002","id":"PMC_15665002","title":"PAR1 cleavage and signaling in response to activated protein C and thrombin.","date":"2005","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/15665002","citation_count":155,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"1868249","id":"PMC_1868249","title":"The spectrum of genetic defects in a panel of 40 Dutch families with symptomatic protein C deficiency type I: heterogeneity and founder effects.","date":"1991","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/1868249","citation_count":153,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":50563,"output_tokens":772,"usd":0.081634},"stage2":{"model":"claude-opus-4-6","input_tokens":3445,"output_tokens":561,"usd":0.046875},"total_usd":0.321727,"stage1_batch_id":"msgbatch_012ZiiCUBfB62NCTQd4Bk1Jo","stage2_batch_id":"msgbatch_01Xuqq9aUHoQouS7UVGZNStZ","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":64747,"output_tokens":4522,"usd":0.131035},"round2_rules_fired":"R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":7776,"output_tokens":103,"usd":0.062183}},"stage1_raw":"Looking at these papers, I need to identify which ones are about the human/mammalian gene \"PC\" (pyruvate carboxylase, encoded by the PC gene) versus other meanings of \"PC\" (polychlorinated biphenyls, PC-12 cells, printed circuit boards, phosphatidylcholine transfer protein, polycystin, etc.).\n\nThe relevant mechanistic papers for the PC gene (pyruvate carboxylase) are:\n- PMID:28710665 - about pyruvate carboxylase (PCB = pyruvate carboxylase protein) in obese mice\n- PMID:37583697 - mentions PC (pyruvate carboxylase) in lupus nephritis context\n\nLet me also check:\n- PMID:33164752 - PC-1/PC-2 polycystin complex - this is PKD1/PKD2, not pyruvate carboxylase\n- PMID:20338778 - PC-TP/StARD2 - phosphatidylcholine transfer protein, not pyruvate carboxylase\n- PMID:8917428 - PC-1 hepatic membrane protein (ENPP1) - not pyruvate carboxylase\n- PMID:32291281 - prohormone convertase PC1/3 - not pyruvate carboxylase\n\nPMID:28710665 discusses \"pyruvate carboxylase protein (PCB)\" - note they abbreviate it \"PCB\" which is unusual, but the context is hepatic gluconeogenesis in obese mice. This is the only paper clearly about pyruvate carboxylase (PC gene).\n\nPMID:37583697 mentions \"CD10+ PC+ (pyruvate carboxylase) epithelial cells\" in lupus nephritis context with ferroptosis, but this is expression/association data.\n\nGiven the very limited mechanistic content specifically about the PC (pyruvate carboxylase) gene, I'll extract what's available.\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2017,\n      \"finding\": \"Pyruvate carboxylase (PC) protein levels are elevated in hepatic tissue of diet-induced obese mice and are reduced by exercise training, correlating with attenuation of hyperglycemia, suggesting PC contributes to dysregulated hepatic gluconeogenesis in obesity.\",\n      \"method\": \"Western blotting of liver tissue from obese mice subjected to treadmill exercise training, combined with insulin tolerance testing\",\n      \"journal\": \"The journal of physiological sciences : JPS\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single lab, correlative Western blot without direct enzymatic or mechanistic validation of PC's causal role\",\n      \"pmids\": [\"28710665\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Based on the available corpus, only one paper directly addresses pyruvate carboxylase (PC) mechanistically, showing that hepatic PC protein levels are elevated in diet-induced obese mice and reduced by exercise training in association with improved glucose homeostasis, but the corpus provides insufficient mechanistic detail to establish a comprehensive functional model of PC enzyme activity, regulation, or pathway position.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll classify each paper and extract discoveries only from KEEP papers.\n\n**Classification:**\n\nThe gene PC here refers to **Protein C** (PROC gene, the anticoagulant serine protease). The gene2pubmed-curated papers clearly confirm this (papers about protein C activation, anticoagulation, thrombomodulin, EPCR, PAR1 signaling).\n\nThe 100 retrieved papers are overwhelmingly about **polychlorinated biphenyls (PCB)**, PC-12 pheochromocytoma cells, printed circuit boards (PCB), phosphatidylcholine (PC as abbreviation), or other unrelated uses of \"PC\" — all EXCLUDE.\n\n**KEEP from retrieved papers:**\n- Paper [18] — PC-1/PC-2 polycystin complex (EXCLUDE — this is PKD1/PKD2, not Protein C)\n- Paper [33] — PC-TP/StARD2 (EXCLUDE — phosphatidylcholine transfer protein, not Protein C)\n- Paper [38] — Prohormone convertase PC1/3 (EXCLUDE — different gene)\n- Paper [40], [56], [60], [61] — PC-1/ENPP1 (EXCLUDE — different gene)\n- Paper [82] — pyruvate carboxylase PCB (EXCLUDE — different gene, also uses \"PCB\" for pyruvate carboxylase)\n- Paper [63] — mentions PC (pyruvate carboxylase) in epithelial cells (EXCLUDE)\n\n**KEEP from gene2pubmed papers:** Papers [3,6,9,10,14,15,16,17,18,19,20,22,23,24,25,26,28,29,30] — these are clearly about Protein C (PROC).\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1979,\n      \"finding\": \"Human protein C was isolated from plasma and shown to be a vitamin K-dependent zymogen composed of a disulfide-linked light chain (Mr ~21,000) and heavy chain (Mr ~41,000). Activation by alpha-thrombin produces a serine protease with amidolytic and anticoagulant activity through limited proteolysis of the heavy chain, with the active-site serine residing in the heavy chain.\",\n      \"method\": \"Protein purification (barium citrate adsorption, DEAE-Sephadex, dextran sulfate agarose chromatography), SDS-PAGE, NH2-terminal sequencing, DFP active-site labeling, clotting assays\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — foundational biochemical reconstitution and active-site characterization with multiple orthogonal methods\",\n      \"pmids\": [\"468991\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1984,\n      \"finding\": \"Cloning of human protein C cDNA established that the protein is synthesized as a single-chain precursor containing the light chain and heavy chain connected by a Lys-Arg dipeptide; post-translational cleavage of this dipeptide and disulfide bond formation generate the mature two-chain plasma form. The catalytic domain shows high sequence identity with prothrombin, factor IX, and factor X.\",\n      \"method\": \"Lambda gt11 cDNA library screening with anti-protein C antibody, DNA sequencing (dideoxy), amino acid sequence analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — primary cDNA cloning and sequencing establishing biosynthetic mechanism\",\n      \"pmids\": [\"6589623\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1985,\n      \"finding\": \"The human protein C gene spans ~11 kilobases and consists of eight exons and seven introns encoding a preproleader sequence, light chain, Lys-Arg connecting dipeptide, and heavy chain (serine protease catalytic domain). Intron positions are conserved with factor IX, indicating recent gene duplication within the vitamin K-dependent serine protease family.\",\n      \"method\": \"Genomic library screening, dideoxy sequencing of overlapping lambda phage clones spanning 11 kb\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — complete gene structure determination\",\n      \"pmids\": [\"2991887\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1986,\n      \"finding\": \"Detailed genomic analysis revealed that the human protein C gene has nine exons and eight introns spanning at least 11.2 kb, with two EGF-homology regions (amino acids 46–91 and 92–136) each precisely delimited by introns — a domain organization shared exactly with factor IX and tissue plasminogen activator, demonstrating modular exon shuffling in the coagulation protease family.\",\n      \"method\": \"Isolation of overlapping phage genomic clones, complete sequence determination, intron/exon boundary mapping\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — complete gene structure with evolutionary analysis replicated in independent study\",\n      \"pmids\": [\"3511471\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1989,\n      \"finding\": \"Protein C is activated on endothelial cell surfaces by thrombin bound to thrombomodulin; activated protein C (APC) then functions as an anticoagulant serine protease that inactivates factors Va and VIIIa, and protein S serves as a cofactor for APC. This established the protein C anticoagulant pathway as a key regulatory system for blood coagulation.\",\n      \"method\": \"Biochemical reconstitution with purified components, activity assays, cofactor studies\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted biochemical pathway, highly cited foundational review synthesizing experimental work\",\n      \"pmids\": [\"2538457\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"APC inactivates human factor VIIIa by proteolytic cleavage within the A1 and A2 subunits of the heavy chain at Arg336 and Arg562 (with a third site at Arg740). Cleavage at Arg562 correlates most closely with loss of cofactor activity and promotes dissociation of the A2 domain from the A1/light chain dimer, establishing a two-step mechanism for factor VIII inactivation.\",\n      \"method\": \"In vitro proteolysis with purified APC, SDS-PAGE fragment analysis, NH2-terminal sequencing, anti-A2 monoclonal antibody reactivity, gel filtration\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted in vitro proteolysis with site identification and functional correlation\",\n      \"pmids\": [\"1939075\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"Genetic defects causing hereditary protein C deficiency type I in Dutch families are heterogeneous point mutations throughout the protein C gene; six mutations recur in multiple families, with the most frequent showing a founder effect. This established the molecular basis of thrombosis risk from protein C haploinsufficiency.\",\n      \"method\": \"DNA sequencing of protein C gene in 40 probands, mutation analysis\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — systematic genetic characterization across 40 families\",\n      \"pmids\": [\"1868249\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"APC inactivates human factor Va on phospholipid membranes through sequential cleavages at Arg306, Arg506, Arg679, and Lys994 in the heavy chain. Cleavage at Arg506 precedes and is required for cleavage at Arg306 (the critical inactivating cut), and membrane binding is absolutely required for efficient inactivation — membrane-free factor Va retains ~80% cofactor activity after 2 h of APC treatment.\",\n      \"method\": \"In vitro proteolysis with purified components and PCPS vesicles, SDS-PAGE, NH2-terminal sequencing of fragments, functional cofactor activity assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted in vitro system with site-specific cleavage mapping and functional readout\",\n      \"pmids\": [\"7989361\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"The 2.8 Å crystal structure of Gla-domainless APC revealed: (1) the light chain comprises two EGF-like domains arranged at ~80° to each other; (2) the catalytic domain is trypsin-like but contains a large insertion loop at the active site edge, a third helical segment, a prominent cationic patch (analogous to thrombin's anion-binding exosite I), and a Ca²⁺-binding site; (3) the S2 and S4 subsites are more polar than in factor Xa or thrombin, explaining APC's distinct substrate specificity.\",\n      \"method\": \"X-ray crystallography at 2.8 Å resolution\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with functional implications for substrate specificity\",\n      \"pmids\": [\"9003757\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"APC uses the endothelial cell protein C receptor (EPCR) as a coreceptor to cleave protease-activated receptor 1 (PAR1) on endothelial cells, triggering cytoprotective gene expression including selective induction of MCP-1. This established that PAR1 is the signaling receptor for the EPCR-dependent APC pathway and distinguishes APC's anti-inflammatory signaling from its anticoagulant functions.\",\n      \"method\": \"Gene profiling of APC-stimulated endothelial cells, PAR1/PAR2 receptor-specific assays, EPCR blocking studies\",\n      \"journal\": \"Science (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — receptor identification with gene profiling and receptor-blocking experiments, highly cited\",\n      \"pmids\": [\"12052963\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"APC directly prevents apoptosis in hypoxic human brain endothelium through transcriptional inhibition of p53, normalization of the Bax/Bcl-2 ratio, and reduction of caspase-3 signaling. This cytoprotection requires both EPCR and PAR-1, and in vivo neuroprotection in a mouse stroke model was EPCR-dependent and independent of APC's anticoagulant activity.\",\n      \"method\": \"Hypoxia cell model, gene/protein expression analysis (p53, Bax, Bcl-2, caspase-3), EPCR/PAR-1 blocking antibodies, EPCR-deficient mouse stroke model\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods in vitro and in vivo, receptor requirement established\",\n      \"pmids\": [\"12563316\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Thrombomodulin on endothelial cell surfaces acts as the critical cofactor for thrombin-mediated protein C activation; EPCR further amplifies this activation. APC then exerts anticoagulant effects by degrading FVa and FVIIIa on negatively charged phospholipid membranes with protein S as cofactor, and separately exerts anti-inflammatory/antiapoptotic effects via EPCR-PAR1 signaling. These functions are integrated to maintain hemostatic homeostasis.\",\n      \"method\": \"Review synthesizing biochemical, cell biology, and mouse genetic studies\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — synthesis of replicated experimental findings across multiple labs\",\n      \"pmids\": [\"15178554\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"APC mediates endothelial barrier enhancement through EPCR ligation followed by transactivation of sphingosine 1-phosphate receptor 1 (S1P1), leading to Rac1 GTPase activation, cortical actin polymerization, and increased myosin light chain phosphorylation. Co-immunoprecipitation showed EPCR-S1P1 interaction upon APC treatment; S1P1 siRNA silencing significantly reduced APC barrier protection.\",\n      \"method\": \"Transendothelial electrical resistance measurements, Rac1 activity assays, co-immunoprecipitation, siRNA knockdown of S1P1, EPCR-blocking antibody, cortical actin imaging\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods establishing novel receptor transactivation mechanism\",\n      \"pmids\": [\"15710622\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"APC cleaves PAR1 on endothelial cells in an EPCR-dependent manner but is ~10,000-fold less potent than thrombin at PAR1 cleavage. Both APC and thrombin trigger PAR1-dependent gene induction (antiapoptotic and chemokine genes), but at physiological concentrations APC does not significantly contribute to PAR1 cleavage beyond that of thrombin. APC also cleaves PAR2 via canonical cleavage, though PAR1 remains dominant for APC signaling even when PAR2 is upregulated.\",\n      \"method\": \"PAR1 cleavage kinetics on endothelial cell surfaces, EPCR antibody blocking, gene expression analysis, PAR1⁻/⁻ mouse studies\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — quantitative receptor kinetics with genetic validation\",\n      \"pmids\": [\"15665002\", \"15769747\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Structural and molecular recognition analysis of the protein C system established that protein S is an essential cofactor for APC-mediated degradation of FVIIIa and FVa on phospholipid membranes, and that intact factor V (in addition to protein S) is required for efficient FVIIIa degradation, revealing FV as a Janus-faced protein with both procoagulant and anticoagulant potential.\",\n      \"method\": \"Review integrating biochemical reconstitution, structural data (3D structures of protein C system components), and mutagenesis studies\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — synthesis of structural and biochemical reconstitution data across multiple labs\",\n      \"pmids\": [\"15860736\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"In diabetic mice, thrombomodulin-dependent APC formation is reduced, and this reduction is causally linked to nephropathy. APC prevents glucose-induced apoptosis in glomerular endothelial cells and podocytes via modulation of the mitochondrial apoptosis pathway through PAR-1 and EPCR. Maintaining high APC levels during long-term diabetes protects against nephropathy, establishing the thrombomodulin-PC-EPCR axis as a protective pathway in diabetic end-organ damage.\",\n      \"method\": \"Diabetic mouse models (thrombomodulin-deficient and APC-overexpressing), glomerular apoptosis assays, endothelial cell and podocyte culture with glucose stress, PAR-1/EPCR inhibition\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo genetic models combined with in vitro mechanistic studies\",\n      \"pmids\": [\"17982464\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Protein C (PC/PROC) is a vitamin K-dependent plasma zymogen that circulates as a disulfide-linked two-chain glycoprotein; it is activated to the serine protease APC by thrombin bound to endothelial thrombomodulin (amplified by EPCR), whereupon APC exerts anticoagulant activity by sequentially cleaving and inactivating factor Va (at Arg506 then Arg306/Arg679 on phospholipid membranes, requiring protein S as cofactor) and factor VIIIa (at Arg562 then Arg336, causing A2 domain dissociation), and separately exerts cytoprotective/anti-inflammatory signaling by binding EPCR and cleaving PAR1 (and PAR2) on endothelial cells, activating Rac1 via S1P1 transactivation to enhance barrier function and suppressing p53-mediated apoptosis through transcriptional mechanisms.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"Pyruvate carboxylase (PC) is a biotin-dependent mitochondrial enzyme that catalyzes the ATP-dependent carboxylation of pyruvate to oxaloacetate, serving as a critical entry point for gluconeogenesis and anaplerosis. Hepatic PC protein levels are elevated in diet-induced obesity and are reduced by exercise training in association with improved glucose homeostasis, consistent with a role in dysregulated hepatic gluconeogenesis [PMID:28710665]. Detailed mechanistic dissection of PC regulation and its precise contribution to metabolic flux in this context remains limited in the available primary literature.\",\n  \"teleology\": [\n    {\n      \"year\": 2017,\n      \"claim\": \"This study addressed whether hepatic PC expression changes in obesity and responds to exercise, establishing that PC protein is upregulated in obese liver and normalized by training alongside improved glycemia.\",\n      \"evidence\": \"Western blotting of liver lysates from high-fat-diet mice with or without treadmill exercise training, plus insulin tolerance tests\",\n      \"pmids\": [\"28710665\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"Correlative Western blot data without direct enzymatic activity measurements or genetic perturbation to establish causality\",\n        \"No mechanistic analysis of how exercise reduces PC protein (transcriptional vs. post-translational regulation unknown)\",\n        \"Single study in one mouse model; not independently confirmed\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The causal contribution of hepatic PC to obesity-associated hyperglycemia and the molecular mechanisms regulating its expression in response to metabolic stress remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No loss-of-function or gain-of-function experiments (e.g., liver-specific knockout) in the available literature\",\n        \"Structural basis for PC regulation and allosteric control not addressed\",\n        \"Flux through the PC-dependent gluconeogenic pathway not quantified\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [],\n    \"localization\": [],\n    \"pathway\": [],\n    \"complexes\": [],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"Insufficient on-target evidence to synthesize a narrative — discovery timeline does not match the canonical PC protein.\",\n  \"teleology\": [],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [],\n    \"localization\": [],\n    \"pathway\": [],\n    \"complexes\": [],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}\n```"}