{"gene":"CPB2","run_date":"2026-04-28T17:28:53","timeline":{"discoveries":[{"year":1995,"finding":"TAFI (CPB2/plasma procarboxypeptidase B) was purified from human plasma as a 60-kDa single-chain protein that, upon cleavage by thrombin, generates a 35-kDa product with carboxypeptidase B-like activity that inhibits fibrinolysis by blocking activation of Glu-plasminogen; the competitive CPB inhibitor GEMSA completely abolishes this antifibrinolytic effect.","method":"Purification from plasma, in vitro clot lysis assay, amino-terminal sequence analysis, competitive inhibitor studies","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — original discovery with purification, enzymatic characterization, and functional reconstitution in a defined system","pmids":["7782309"],"is_preprint":false},{"year":1996,"finding":"The thrombin-thrombomodulin complex is the primary physiological activator of TAFI; thrombomodulin increases the catalytic efficiency of TAFI activation 1250-fold (expressed almost exclusively as an increase in kcat), forming a ternary thrombin-thrombomodulin-TAFI complex with kcat = 1.2 s⁻¹ and Km = 1.0 µM for TAFI and Kd = 8.6 nM for thrombomodulin.","method":"Kinetic analysis of purified components, thrombomodulin titration, in vitro clot lysis assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — rigorous kinetics with purified components, replicated across multiple studies","pmids":["8663147"],"is_preprint":false},{"year":1996,"finding":"Activated protein C (APC) exerts its profibrinolytic effect predominantly through TAFI-dependent mechanisms: APC has no profibrinolytic effect in TAFI-immunodepleted plasma, and the effect is fully reconstituted by adding purified TAFI; monoclonal antibody blocking TAFI activation mimics APC's profibrinolytic effect.","method":"TAFI immunodepletion, reconstitution with purified TAFI, monoclonal antibody inhibition, turbidity-based clot lysis assay, ELISA (plasma TAFI concentration = 73 nM)","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — depletion/reconstitution with multiple orthogonal inhibitory approaches","pmids":["8822928"],"is_preprint":false},{"year":1997,"finding":"TAFIa suppresses fibrinolysis by removing C-terminal lysine residues from partially degraded fibrin, thereby downregulating the cofactor function of fibrin in the fibrinolytic cascade; thrombin generation links coagulation to fibrinolytic suppression through this mechanism.","method":"In vitro clot lysis assays with purified components, CPB inhibitor studies","journal":"Thrombosis and haemostasis","confidence":"High","confidence_rationale":"Tier 1 — biochemically established mechanism replicated across labs","pmids":["9198184"],"is_preprint":false},{"year":1997,"finding":"Meizothrombin, a thrombin intermediate, can activate TAFI in the presence of thrombomodulin, but is much less potent than thrombin in procoagulant functions, indicating differential substrate specificity in the thrombomodulin-dependent pathway.","method":"Recombinant expression of prothrombin mutants, kinetic assays for TAFI activation and protein C activation in presence of thrombomodulin","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 — purified recombinant proteins but single study for TAFI-specific finding","pmids":["9045633"],"is_preprint":false},{"year":1998,"finding":"Recombinant TAFI (rTAFI) expressed in BHK cells has activation kinetics by thrombin/thrombomodulin indistinguishable from plasma TAFI (kcat ~0.55-0.61 s⁻¹, Km ~0.54-0.55 µM); activated TAFIa is intrinsically thermally unstable with a half-life of ~10 min at 37°C, and decay is associated with quenching of intrinsic fluorescence; competitive inhibitors GEMSA and ε-aminocaproic acid stabilize TAFIa.","method":"Stable BHK cell expression, purification, kinetics of activation, fluorescence spectroscopy, thermal stability assays, in vitro fibrinolysis assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — multiple orthogonal methods including kinetics, biophysics, and functional assays","pmids":["9442053"],"is_preprint":false},{"year":1999,"finding":"Activation of TAFI by thrombin occurs at Arg-92; the TAFI gene contains 11 exons spanning ~48 kb, shares conserved intron/exon boundaries with pancreatic carboxypeptidase genes, and a ~70 bp liver-specific promoter element was identified by transient transfection reporter assays.","method":"Genomic library cloning, exon mapping, transient transfection reporter assays, cDNA sequencing","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 — genomic characterization with functional promoter mapping in mammalian cells","pmids":["10350473"],"is_preprint":false},{"year":2001,"finding":"Two naturally occurring TAFI variants at position 325 (Thr vs. Ile) differ substantially in TAFIa thermal stability: Ile-325 TAFIa has a half-life of ~15 min vs. ~8 min for Thr-325 at 37°C, conferring ~60% greater antifibrinolytic potency, while the Ala-147/Thr-147 variation has minimal effect on enzymatic properties.","method":"Stable BHK cell expression of four variant combinations, purification, thermal stability assays, clot lysis assays, kinetics of activation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — reconstitution with multiple purified variants, multiple orthogonal methods","pmids":["11684677"],"is_preprint":false},{"year":2001,"finding":"Thrombomodulin concentration determines the balance between fibrinolysis promotion (via protein C activation at high TM) and inhibition (via TAFI activation at low TM); protein C inhibitor (PCI) differentially regulates the thrombin-TM complex to modulate TAFI vs. protein C activation.","method":"Plasma-based clot lysis assays with varying thrombomodulin concentrations, TAFI activity measurement, protein C pathway inhibition","journal":"Thrombosis and haemostasis","confidence":"High","confidence_rationale":"Tier 2 — replicated across two independent studies with consistent results","pmids":["11204587","11686324"],"is_preprint":false},{"year":2001,"finding":"Protein S inhibits TAFI activation through two mechanisms: as an APC cofactor reducing maximum TAFIa activity, and independently of APC by inhibiting initial thrombin formation, thereby reducing the rate of TAFI activation.","method":"Protein S depletion from plasma, antibody inhibition, measurement of TAFI activation rate and maximum activity","journal":"Thrombosis and haemostasis","confidence":"Medium","confidence_rationale":"Tier 2 — depletion and antibody inhibition in plasma system, single lab","pmids":["11686322"],"is_preprint":false},{"year":2002,"finding":"Amino acids in the P6-P'3 region surrounding the Arg-92 activation cleavage site of TAFI do not determine thrombomodulin dependence of TAFI activation; thrombomodulin's role is to optimally orient thrombin and substrate rather than allosterically alter thrombin active-site specificity.","method":"Site-directed mutagenesis of TAFI activation site, expression in mammalian cells, kinetic analysis of activation by thrombin ± thrombomodulin","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 — mutagenesis with kinetic analysis, single study","pmids":["11786552"],"is_preprint":false},{"year":2002,"finding":"Crystal structure of human pancreatic procarboxypeptidase B (the structural prototype for plasma TAFI/CPB2) at 1.6 Å resolution reveals a 95-residue pro-segment with globular + alpha-helical topology shielding a preformed active site; the active-site Zn-binding residue has two alternate conformations relevant to substrate binding.","method":"X-ray crystallography at 1.6 Å resolution","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 — high-resolution crystal structure with functional implications","pmids":["12162965"],"is_preprint":false},{"year":2002,"finding":"TAFI deficiency in mice (knockout) is compatible with life; TAFI-deficient mice fail to prolong clot lysis time in vitro but show no excess bleeding or altered occlusion times in arterial/venous injury models under normal conditions, and TAFI does not play a major role in bradykinin catabolism under basal conditions.","method":"Targeted gene disruption, in vitro clot lysis assay, tail transection bleeding assay, arterial/venous thrombosis models, bradykinin writhing test","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — multiple phenotypic readouts in knockout mice across multiple labs","pmids":["11781355","11815293"],"is_preprint":false},{"year":2003,"finding":"TAFI is present in human platelets (~50 ng/10⁹ platelets), is secreted upon platelet activation, can be activated by thrombin/thrombomodulin similarly to plasma TAFI, and is synthesized in megakaryocytes (mRNA detected in megakaryocytic cell lines DAMI and CHRF); platelet-TAFI glycosylation differs from plasma TAFI.","method":"TAFI ELISA, Western blot, platelet activation assays, RT-PCR in megakaryocytic cell lines, thrombomodulin-dependent activation kinetics","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods establishing platelet TAFI source and function","pmids":["12595308"],"is_preprint":false},{"year":2003,"finding":"Hyperprothrombinemia (prothrombin G20210A mutation) inhibits fibrinolysis through a TAFI-dependent mechanism: increased prothrombin generates more late thrombin, activates more TAFI, and a specific TAFIa inhibitor abolishes the difference in clot lysis time between carriers and non-carriers.","method":"TAFIa activity assay during clot lysis, specific TAFIa inhibitor (PTCI), purified prothrombin addition to normal plasma, plasma from G20210A carriers","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — mechanistic link established by inhibitor rescue and purified component reconstitution","pmids":["14630828"],"is_preprint":false},{"year":2006,"finding":"TAFIa zymogen (TAFI itself, before activation) exhibits continuous and stable carboxypeptidase activity against large peptide substrates, suggesting that the zymogen is not completely inactive and may down-regulate fibrinolysis constitutively in vivo.","method":"In vitro carboxypeptidase activity assay on purified zymogen with large peptide substrates","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 — direct enzymatic assay, single study challenging previous dogma","pmids":["17138567"],"is_preprint":false},{"year":2006,"finding":"Limited mutagenesis of TAFIa can extend its half-life at 37°C from 0.2 h up to 5.5 h; increased stability correlates with thermostability and trypsin resistance; more stable TAFIa mutants more effectively down-regulate fibrinolysis than higher concentrations of less stable wild-type enzyme, demonstrating that TAFIa stability is a greater determinant of antifibrinolytic potency than zymogen concentration.","method":"Site-directed mutagenesis, thermal stability assays, trypsin susceptibility, in vitro clot lysis assays","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 1 — mutagenesis with functional validation, single lab","pmids":["16441664"],"is_preprint":false},{"year":2008,"finding":"Crystal structures of TAFI, a TAFI-GEMSA inhibitor complex, and a quadruple TAFI mutant (70-fold more stable) reveal that TAFIa stability is governed by a dynamic 55-residue flap (residues 296-350) including active-site wall residues; in the zymogen, the activation peptide stabilizes this flap; after activation peptide release, increased flap mobility leads to conformational changes that disrupt the catalytic site and expose a cryptic thrombin-cleavage site at Arg302, establishing a novel auto-regulatory mechanism of enzyme inactivation.","method":"X-ray crystallography (TAFI, TAFI-GEMSA, and quadruple mutant), site-directed mutagenesis, thermal stability assays","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1 — multiple crystal structures combined with mutagenesis and functional validation","pmids":["18559974"],"is_preprint":false},{"year":2008,"finding":"Crystal structure of TAFI at 2.1 Å reveals that the active site is accessible in the zymogen (explaining intrinsic activity), identifies an 'instability region' consistent with mutagenesis data, and identifies sulfate ions bound to this region pointing toward a potential heparin-binding site that could explain how heparin stabilizes TAFIa.","method":"X-ray crystallography, site-directed mutagenesis cross-validation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with mechanistic implications validated by prior mutagenesis","pmids":["18669641"],"is_preprint":false},{"year":2008,"finding":"Activated TAFI (CPB2) inactivates pro-inflammatory mediators bradykinin, C3a, C5a, and thrombin-cleaved osteopontin by removing C-terminal arginines; in vivo, proCPB-deficient mice show enhanced bradykinin-induced hypotension and enhanced C5a-induced pulmonary alveolitis, and a thrombin mutant (E229K) that selectively activates proCPB (not protein C) reverses these inflammatory phenotypes in wild-type but not proCPB-deficient mice.","method":"In vitro enzymatic assays, proCPB-deficient mouse models, in vivo infusion of E229K thrombin mutant, C5a-induced alveolitis model, inflammatory arthritis model","journal":"Molecular immunology","confidence":"High","confidence_rationale":"Tier 2 — multiple in vivo models with knockout mice and selective activator, replicated across two papers","pmids":["18706698","19025114"],"is_preprint":false},{"year":2008,"finding":"Pig thrombomodulin binds human thrombin but is a poor cofactor for activation of human TAFI (and protein C); domain-swapping experiments show that EGF5 of thrombomodulin is the most important determinant of species compatibility for TAFI activation.","method":"Cloning of pig TM, domain-swapping, transfection assays measuring TAFI activation efficiency","journal":"American journal of transplantation","confidence":"Medium","confidence_rationale":"Tier 2 — domain swapping with functional readout, single study","pmids":["18444940"],"is_preprint":false},{"year":2008,"finding":"Streptococcus pyogenes recruits and activates TAFI on its surface; activated TAFI processes bradykinin by C-terminal truncation, converting it from a B2 receptor ligand to a B1 receptor agonist, potentially redirecting inflammation from transient to chronic.","method":"Bacterial surface binding assays, TAFI activation assays, bradykinin processing, B1/B2 receptor signaling assays, electron microscopy","journal":"Journal of innate immunity","confidence":"Medium","confidence_rationale":"Tier 2 — direct enzymatic processing shown with receptor functional readout, single study","pmids":["20375563"],"is_preprint":false},{"year":2010,"finding":"Platelet factor 4 (PF4) inhibits thrombomodulin-dependent activation of TAFI by thrombin while simultaneously stimulating protein C activation, demonstrating that PF4 modulates the substrate specificity of the thrombin-TM complex to selectively suppress TAFIa-mediated antifibrinolytic and anti-inflammatory activities; N-acetylated heparin (NAc-Hep) blocks PF4 binding to TM and reverses this inhibition.","method":"In vitro clot lysis assays, bradykinin conversion assay, hemophilia A plasma, TM-expressing cell assays, competition binding experiments","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — multiple functional readouts with defined inhibitor mechanism, single lab","pmids":["21041299"],"is_preprint":false},{"year":2007,"finding":"TAFI and pancreatic carboxypeptidase B inhibit in vitro capillary tube formation by human microvascular endothelial cells by removing C-terminal lysine residues from fibrin degradation products and from the cell surface, thereby impairing plasminogen-dependent endothelial cell migration (without affecting proliferation or adhesion).","method":"3D plasma clot matrix tube formation assay, fibrin degradation product measurement, cell migration assay, TAFIa inhibitor (PTCI)","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"Medium","confidence_rationale":"Tier 2 — functional assay with inhibitor and purified enzyme, single lab","pmids":["17673703"],"is_preprint":false},{"year":2017,"finding":"Activated TAFI (TAFIa) promotes development of chronic thromboembolic pulmonary hypertension (CTEPH): bone marrow transplantation shows that hepatic TAFI (not marrow-derived) is activated locally in pulmonary artery endothelial cells via thrombin-thrombomodulin; TAFIa increases PA endothelial permeability, smooth muscle cell proliferation, and monocyte/macrophage activation; TAFIa inhibitor reduces pulmonary hypertension in mouse and rat models.","method":"Bone marrow transplantation, overexpression of TAFIa in mice, TAFIa inhibitor treatment, immunostaining, clot lysis assays, hemodynamic measurements","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 — bone marrow transplantation establishes cellular source; multiple mechanistic readouts in vivo","pmids":["28289017"],"is_preprint":false},{"year":2012,"finding":"In double TAFI/PAI-1 knockout mice, TAFI deficiency predominantly determines enhanced fibrinolytic capacity as measured by thromboelastometry and fibrin deposition in a thromboembolism model, demonstrating that TAFI is a more critical fibrinolysis regulator than PAI-1 under the conditions tested.","method":"TAFI/PAI-1 double-knockout mouse generation, rotational thromboelastometry, thromboembolism model (fibrin deposition in lungs), tail vein bleeding model","journal":"Journal of thrombosis and haemostasis","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis via double-KO with defined phenotypic readouts","pmids":["23083123"],"is_preprint":false},{"year":2013,"finding":"TAFI deficiency promotes liver damage in murine models: TAFI-knockout mice show accelerated fibrogenesis (increased α-SMA, pro-collagen α1), elevated liver enzymes, and increased neutrophil influx in CCl4-induced chronic liver injury, and increased necrosis after acetaminophen intoxication, linking TAFI's anti-inflammatory activity (via anaphylatoxin inactivation) to protection against liver inflammation.","method":"TAFI-knockout mice, CCl4-induced chronic liver injury, acetaminophen intoxication model, immunohistochemistry, ALT/AST measurement, hepatic fibrin deposition","journal":"Thrombosis and haemostasis","confidence":"Medium","confidence_rationale":"Tier 2 — knockout with multiple disease models, single lab","pmids":["23467679"],"is_preprint":false},{"year":1999,"finding":"Activation of TAFI during clot formation in plasma is largely factor XI-dependent (reduced ~65% by anti-factor XI antibody), occurs after clot formation via thrombin feedback, and requires conversion of approximately 50% of prothrombin to thrombin for full TAFI activation; the contact system (factor XII) is not required.","method":"Factor XI and factor XII neutralizing monoclonal antibodies, factor II-deficient plasma, specific TAFIa activity assay","journal":"Thrombosis and haemostasis","confidence":"High","confidence_rationale":"Tier 2 — neutralizing antibodies and factor-deficient plasmas, replicated in 13 individuals","pmids":["10613658"],"is_preprint":false},{"year":2020,"finding":"In a pedigree with thrombomodulin-associated coagulopathy carrying a stop-gain variant in CPB2 (encoding TAFI), co-inherited TAFI deficiency partially attenuates the delayed fibrinolysis caused by high thrombomodulin levels without affecting defective thrombin generation, directly confirming that TM-dependent TAFI activation mediates the fibrinolytic delay.","method":"Next-generation sequencing, plasma TAFI level measurement, clot lysis assays, thrombin generation assays in human pedigree members","journal":"Journal of thrombosis and haemostasis","confidence":"Medium","confidence_rationale":"Tier 2 — natural genetic epistasis in human pedigree with functional phenotyping","pmids":["32634856"],"is_preprint":false}],"current_model":"CPB2 (TAFI/plasma procarboxypeptidase B) is a hepatically synthesized plasma zymogen that is activated proteolytically at Arg-92 by the thrombin-thrombomodulin complex (primary physiological activator, 1250-fold more efficient than free thrombin) or by plasmin; the resulting active enzyme (TAFIa) removes C-terminal lysine residues from partially degraded fibrin to suppress fibrinolysis, cleaves C-terminal arginines from bradykinin, C3a, and C5a to dampen inflammation, and spontaneously inactivates within ~10 minutes at 37°C via a dynamic 55-residue flap mechanism that disrupts its catalytic site after release of the activation peptide, as revealed by crystal structures; its activity is further regulated by thrombomodulin concentration, protein C/protein S axis, platelet factor 4, and natural polymorphisms at position 325 (Thr/Ile) that alter TAFIa half-life and antifibrinolytic potency."},"narrative":{"teleology":[{"year":1995,"claim":"Identification of a novel plasma protein that couples thrombin generation to fibrinolytic suppression resolved how coagulation directly attenuates plasminogen activation on fibrin.","evidence":"Purification of a 60-kDa zymogen from human plasma, thrombin cleavage to 35-kDa active form, inhibition of Glu-plasminogen activation on fibrin, reversal by CPB inhibitor GEMSA","pmids":["7782309"],"confidence":"High","gaps":["Physiological activator not yet identified (free thrombin is inefficient)","In vivo relevance not established"]},{"year":1996,"claim":"Demonstration that the thrombin–thrombomodulin complex is the physiological activator of TAFI (1250-fold enhancement) and that activated protein C exerts its profibrinolytic effect through TAFI-dependent suppression of thrombin generation established the regulatory logic connecting the anticoagulant and fibrinolytic pathways.","evidence":"Kinetic analysis with purified thrombin/TM/TAFI showing kcat increase; TAFI immunodepletion/reconstitution showing APC profibrinolytic effect is entirely TAFI-dependent","pmids":["8663147","8822928"],"confidence":"High","gaps":["Structural basis of thrombomodulin cofactor effect unknown","In vivo activation kinetics not measured"]},{"year":1998,"claim":"Characterization of TAFIa's intrinsic thermal instability (~10 min half-life at 37 °C) revealed that the enzyme self-limits its antifibrinolytic effect, making stability rather than concentration the key determinant of activity.","evidence":"Recombinant TAFI expression in BHK cells, fluorescence spectroscopy showing conformational decay, competitive inhibitor stabilization","pmids":["9442053"],"confidence":"High","gaps":["Structural basis of instability unknown","Physiological significance of self-inactivation not tested in vivo"]},{"year":1999,"claim":"Mapping the activation cleavage site to Arg-92, characterizing the gene structure (11 exons, liver-specific promoter), and showing that factor XI–dependent thrombin feedback (not contact activation) drives TAFI activation during clot formation placed TAFI within the intrinsic coagulation amplification loop.","evidence":"Genomic cloning and reporter assays for promoter; factor XI/XII neutralizing antibodies and factor II-deficient plasma for pathway mapping","pmids":["10350473","10613658"],"confidence":"High","gaps":["Factor XI dependence measured in plasma system only; in vivo contribution not tested","Promoter regulation beyond liver-specific element not characterized"]},{"year":2001,"claim":"Discovery that the common Thr325Ile polymorphism nearly doubles TAFIa half-life and increases antifibrinolytic potency by ~60% established a genetic determinant of fibrinolytic capacity, while thrombomodulin concentration and protein S were shown to tune the balance between TAFI and protein C activation.","evidence":"Expression of four TAFI variant combinations in BHK cells with stability/clot lysis assays; TM titration experiments; protein S depletion/reconstitution","pmids":["11684677","11204587","11686322"],"confidence":"High","gaps":["Population-level thrombotic risk from Ile325 not definitively established","Protein S APC-independent mechanism not fully dissected"]},{"year":2002,"claim":"TAFI-knockout mice demonstrated that TAFI is dispensable for normal hemostasis and baseline bradykinin catabolism but is required for thrombin-dependent prolongation of clot lysis, establishing it as a conditional rather than constitutive regulator.","evidence":"Targeted gene disruption in mice; clot lysis, bleeding, arterial/venous thrombosis, and bradykinin writhing tests","pmids":["11781355","11815293"],"confidence":"High","gaps":["Inflammatory challenge phenotypes not yet tested","Compensatory mechanisms not excluded"]},{"year":2003,"claim":"Detection of TAFI in human platelets with secretion upon activation and synthesis in megakaryocytes identified a local, non-hepatic source of TAFI that could contribute to thrombus-proximal antifibrinolytic activity.","evidence":"ELISA, Western blot, RT-PCR in megakaryocytic lines DAMI/CHRF, thrombomodulin-dependent activation kinetics","pmids":["12595308"],"confidence":"High","gaps":["Quantitative contribution of platelet vs. plasma TAFI to hemostasis not established","Glycosylation differences' functional significance unclear"]},{"year":2008,"claim":"Crystal structures of TAFI, TAFI–GEMSA complex, and a hyperstable quadruple mutant revealed that a 55-residue dynamic flap (296–350) is stabilized by the activation peptide in the zymogen; upon activation-peptide release, increased flap mobility disrupts the catalytic site and exposes Arg302 to thrombin cleavage, providing the structural basis for TAFIa's built-in self-inactivation timer.","evidence":"X-ray crystallography of multiple TAFI forms (2.1 Å), mutagenesis cross-validation, thermal stability assays","pmids":["18559974","18669641"],"confidence":"High","gaps":["No time-resolved structural data capturing intermediate states of flap opening","In vivo confirmation of Arg302 cleavage pathway not established"]},{"year":2008,"claim":"In vivo evidence that TAFIa inactivates bradykinin, C3a, and C5a by C-terminal arginine removal—using proCPB-deficient mice and a selective thrombin mutant activator—established TAFI as a physiological anti-inflammatory enzyme beyond its antifibrinolytic role.","evidence":"proCPB-knockout mice, E229K thrombin mutant selective for TAFI activation, bradykinin-induced hypotension model, C5a-induced alveolitis model","pmids":["18706698","19025114"],"confidence":"High","gaps":["Relative quantitative contribution of TAFI vs. other carboxypeptidases (CPN) to anaphylatoxin clearance not resolved","Chronic inflammatory disease models limited"]},{"year":2010,"claim":"Platelet factor 4 was shown to selectively inhibit thrombomodulin-dependent TAFI activation while stimulating protein C activation, revealing an additional layer of substrate-specific modulation of the thrombin–TM complex.","evidence":"In vitro clot lysis, bradykinin conversion assay, NAc-heparin competition binding on TM-expressing cells","pmids":["21041299"],"confidence":"Medium","gaps":["In vivo relevance of PF4-mediated TAFI inhibition not tested","Structural basis of PF4–TM interaction not resolved","Single-lab finding"]},{"year":2013,"claim":"TAFI deficiency promoted liver fibrogenesis and necrosis in injury models, linking TAFI's anti-inflammatory function (anaphylatoxin inactivation) to organ protection beyond the vascular compartment.","evidence":"TAFI-knockout mice in CCl4-induced chronic liver injury and acetaminophen intoxication models with histological and biochemical endpoints","pmids":["23467679"],"confidence":"Medium","gaps":["Mechanism assumed to be via C3a/C5a inactivation but not directly tested with anaphylatoxin measurements","Single-lab study"]},{"year":2017,"claim":"Bone marrow transplantation experiments demonstrated that hepatic (not marrow-derived) TAFI is activated locally in pulmonary artery endothelium via thrombin–TM, driving vascular remodeling in chronic thromboembolic pulmonary hypertension.","evidence":"Bone marrow transplantation, TAFIa overexpression in mice, TAFIa inhibitor treatment, hemodynamic measurements in mouse/rat CTEPH models","pmids":["28289017"],"confidence":"High","gaps":["Human CTEPH causation vs. association not established","Specific substrate responsible for vascular remodeling not identified"]},{"year":2020,"claim":"A human pedigree carrying a CPB2 stop-gain variant confirmed that TM-dependent TAFI activation mediates delayed fibrinolysis in vivo, providing natural genetic epistasis evidence in humans.","evidence":"Next-generation sequencing, plasma TAFI levels, clot lysis and thrombin generation assays in family members with high-TM coagulopathy","pmids":["32634856"],"confidence":"Medium","gaps":["Single pedigree observation","Complete TAFI deficiency phenotype in humans not fully characterized"]},{"year":null,"claim":"Key unresolved questions include the structural dynamics of the flap transition in real time, the quantitative partitioning of TAFI's antifibrinolytic versus anti-inflammatory roles in human disease, and whether pharmacological TAFIa inhibition can safely enhance fibrinolysis without exacerbating inflammation.","evidence":"","pmids":[],"confidence":"High","gaps":["No time-resolved structural data for the inactivation conformational change","No human clinical trial data for selective TAFIa inhibitors","Relative contribution of platelet-derived vs. plasma TAFI in vivo not quantified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,3,5,15,19]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[0,3,5,17,19]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[0,1,5,13]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[13]}],"pathway":[{"term_id":"R-HSA-109582","term_label":"Hemostasis","supporting_discovery_ids":[0,1,3,14,25,27]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[19,26]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,1,5,7]}],"complexes":[],"partners":["THBD","F2","PLG","PF4","PROS1","PROC"],"other_free_text":[]},"mechanistic_narrative":"CPB2 (thrombin-activatable fibrinolysis inhibitor, TAFI) is a hepatically and megakaryocyte-synthesized plasma zymogen that functions as a central regulator linking coagulation, fibrinolysis, and inflammation. The zymogen is cleaved at Arg-92 by the thrombin–thrombomodulin complex—which enhances activation 1250-fold over free thrombin—to generate TAFIa, a carboxypeptidase B-like enzyme that removes C-terminal lysine and arginine residues from partially degraded fibrin (suppressing plasminogen recruitment and fibrinolysis), bradykinin, C3a, C5a, and osteopontin (dampening inflammation) [PMID:7782309, PMID:8663147, PMID:18706698]. TAFIa is intrinsically unstable (half-life ~8–15 min at 37 °C depending on the Thr325Ile polymorphism), and crystal structures reveal that this instability is governed by a dynamic 55-residue flap (residues 296–350) that becomes mobile upon activation-peptide release, disrupting the catalytic site and exposing a cryptic thrombin-cleavage site at Arg302 [PMID:18559974, PMID:11684677]. TAFIa activity is further tuned by thrombomodulin concentration, the protein C/protein S anticoagulant axis, platelet factor 4, and factor XI–dependent thrombin feedback, establishing TAFI as a dose- and time-sensitive rheostat that balances clot stability against fibrinolytic and inflammatory resolution [PMID:8822928, PMID:11204587, PMID:21041299, PMID:10613658]."},"prefetch_data":{"uniprot":{"accession":"Q96IY4","full_name":"Carboxypeptidase B2","aliases":["Carboxypeptidase U","CPU","Plasma carboxypeptidase B","pCPB","Thrombin-activable fibrinolysis inhibitor","TAFI"],"length_aa":423,"mass_kda":48.4,"function":"Cleaves C-terminal arginine or lysine residues from biologically active peptides such as kinins or anaphylatoxins in the circulation thereby regulating their activities. 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JTH","url":"https://pubmed.ncbi.nlm.nih.gov/23083123","citation_count":23,"is_preprint":false},{"pmid":"33477318","id":"PMC_33477318","title":"Carboxypeptidase U (CPU, TAFIa, CPB2) in Thromboembolic Disease: What Do We Know Three Decades after Its Discovery?","date":"2021","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/33477318","citation_count":22,"is_preprint":false},{"pmid":"21519232","id":"PMC_21519232","title":"The relationship among TAFI, t-PA, PAI-1 and F1 + 2 in type 2 diabetic patients with normoalbuminuria and microalbuminuria.","date":"2011","source":"Blood coagulation & fibrinolysis : an international journal in haemostasis and thrombosis","url":"https://pubmed.ncbi.nlm.nih.gov/21519232","citation_count":22,"is_preprint":false},{"pmid":"32634856","id":"PMC_32634856","title":"A new pedigree with thrombomodulin-associated coagulopathy in which delayed fibrinolysis is partially attenuated by co-inherited TAFI deficiency.","date":"2020","source":"Journal of thrombosis and haemostasis : JTH","url":"https://pubmed.ncbi.nlm.nih.gov/32634856","citation_count":22,"is_preprint":false},{"pmid":"30074487","id":"PMC_30074487","title":"Fabrication of omega-shaped microwell arrays for a spheroid culture platform using pins of a commercial CPU to minimize cell loss and crosstalk.","date":"2018","source":"Biofabrication","url":"https://pubmed.ncbi.nlm.nih.gov/30074487","citation_count":21,"is_preprint":false},{"pmid":"11815293","id":"PMC_11815293","title":"Thrombin-activatable fibrinolysis inhibitor (TAFI) deficient mice.","date":"2002","source":"Frontiers in bioscience : a journal and virtual library","url":"https://pubmed.ncbi.nlm.nih.gov/11815293","citation_count":20,"is_preprint":false},{"pmid":"28966118","id":"PMC_28966118","title":"Alternative SET/TAFI Promoters Regulate Embryonic Stem Cell Differentiation.","date":"2017","source":"Stem cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/28966118","citation_count":19,"is_preprint":false},{"pmid":"17002650","id":"PMC_17002650","title":"Characterization of rat thrombin-activatable fibrinolysis inhibitor (TAFI)--a comparative study assessing the biological equivalence of rat, murine and human TAFI.","date":"2006","source":"Journal of thrombosis and haemostasis : JTH","url":"https://pubmed.ncbi.nlm.nih.gov/17002650","citation_count":19,"is_preprint":false},{"pmid":"9890914","id":"PMC_9890914","title":"Identification of a site critical for kinase regulation on the central processing unit (CPU) helix of the aspartate receptor.","date":"1999","source":"Biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/9890914","citation_count":19,"is_preprint":false},{"pmid":"12769657","id":"PMC_12769657","title":"Thrombin activable fibrinolysis inhibitor (TAFI): molecular genetics of an emerging potential risk factor for thrombotic disorders.","date":"2001","source":"Current drug targets. Cardiovascular & haematological disorders","url":"https://pubmed.ncbi.nlm.nih.gov/12769657","citation_count":19,"is_preprint":false},{"pmid":"35639268","id":"PMC_35639268","title":"Lactobacillus salivarius CPU-01 Ameliorates Temozolomide-Induced Intestinal Mucositis by Modulating Gut Microbiota, Maintaining Intestinal Barrier, and Blocking Pro-inflammatory Cytokines.","date":"2022","source":"Probiotics and antimicrobial proteins","url":"https://pubmed.ncbi.nlm.nih.gov/35639268","citation_count":19,"is_preprint":false},{"pmid":"22749979","id":"PMC_22749979","title":"Thrombin-activatable fibrinolysis inhibitor (TAFI) is enhanced in major trauma patients without infectious complications.","date":"2012","source":"Immunobiology","url":"https://pubmed.ncbi.nlm.nih.gov/22749979","citation_count":19,"is_preprint":false},{"pmid":"17673703","id":"PMC_17673703","title":"TAFI and pancreatic carboxypeptidase B modulate in vitro capillary tube formation by human microvascular endothelial cells.","date":"2007","source":"Arteriosclerosis, thrombosis, and vascular biology","url":"https://pubmed.ncbi.nlm.nih.gov/17673703","citation_count":19,"is_preprint":false},{"pmid":"23467679","id":"PMC_23467679","title":"TAFI deficiency promotes liver damage in murine models of liver failure through defective down-regulation of hepatic inflammation.","date":"2013","source":"Thrombosis and haemostasis","url":"https://pubmed.ncbi.nlm.nih.gov/23467679","citation_count":17,"is_preprint":false},{"pmid":"24768003","id":"PMC_24768003","title":"Beta2 toxin is not involved in in vitro cell cytotoxicity caused by human and porcine cpb2-harbouring Clostridium perfringens.","date":"2014","source":"Veterinary microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/24768003","citation_count":16,"is_preprint":false},{"pmid":"15521922","id":"PMC_15521922","title":"TAFI polymorphisms at amino acids 147 and 325 are not risk factors for cerebral infarction.","date":"2004","source":"British journal of haematology","url":"https://pubmed.ncbi.nlm.nih.gov/15521922","citation_count":16,"is_preprint":false},{"pmid":"26340515","id":"PMC_26340515","title":"Plasma levels of carboxypeptidase U (CPU, CPB2 or TAFIa) are elevated in patients with acute myocardial infarction.","date":"2015","source":"Journal of thrombosis and haemostasis : JTH","url":"https://pubmed.ncbi.nlm.nih.gov/26340515","citation_count":15,"is_preprint":false},{"pmid":"19195685","id":"PMC_19195685","title":"Procarboxypeptidase U (TAFI) contributes to the risk of thrombosis in patients with hereditary thrombophilia.","date":"2009","source":"Thrombosis research","url":"https://pubmed.ncbi.nlm.nih.gov/19195685","citation_count":15,"is_preprint":false},{"pmid":"29194929","id":"PMC_29194929","title":"Procarboxypeptidase U (proCPU, TAFI, proCPB2) in cerebrospinal fluid during ischemic stroke is associated with stroke progression, outcome and blood-brain barrier dysfunction.","date":"2017","source":"Journal of thrombosis and haemostasis : JTH","url":"https://pubmed.ncbi.nlm.nih.gov/29194929","citation_count":15,"is_preprint":false},{"pmid":"32556284","id":"PMC_32556284","title":"A case of thrombomodulin mutation causing defective thrombin binding with absence of protein C and TAFI activation.","date":"2020","source":"Blood advances","url":"https://pubmed.ncbi.nlm.nih.gov/32556284","citation_count":15,"is_preprint":false},{"pmid":"26118976","id":"PMC_26118976","title":"Lack of TAFI increases brain damage and microparticle generation after thrombolytic therapy in ischemic stroke.","date":"2015","source":"Thrombosis research","url":"https://pubmed.ncbi.nlm.nih.gov/26118976","citation_count":14,"is_preprint":false},{"pmid":"37169311","id":"PMC_37169311","title":"Characterization of Cetobacterium somerae CPU-CS01 isolated from the intestine of healthy crucian carp (Carassius auratus) as potential probiotics against Aeromonas hydrophila infection.","date":"2023","source":"Microbial pathogenesis","url":"https://pubmed.ncbi.nlm.nih.gov/37169311","citation_count":14,"is_preprint":false},{"pmid":"28669410","id":"PMC_28669410","title":"Thrombin activatable fibrinolysis inhibitor (TAFI) - A possible link between coagulation and complement activation in the antiphospholipid syndrome (APS).","date":"2017","source":"Thrombosis research","url":"https://pubmed.ncbi.nlm.nih.gov/28669410","citation_count":14,"is_preprint":false},{"pmid":"24352481","id":"PMC_24352481","title":"Multi-core CPU or GPU-accelerated Multiscale Modeling for Biomolecular Complexes.","date":"2013","source":"Molecular based mathematical biology","url":"https://pubmed.ncbi.nlm.nih.gov/24352481","citation_count":14,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":52362,"output_tokens":6741,"usd":0.129101},"stage2":{"model":"claude-opus-4-6","input_tokens":10454,"output_tokens":3374,"usd":0.20493},"total_usd":0.334031,"stage1_batch_id":"msgbatch_011kfMfE81o6CTcyhVUqumuW","stage2_batch_id":"msgbatch_01DTputS6WNkH745x1nVSoBo","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1995,\n      \"finding\": \"TAFI (CPB2/plasma procarboxypeptidase B) was purified from human plasma as a 60-kDa single-chain protein that, upon cleavage by thrombin, generates a 35-kDa product with carboxypeptidase B-like activity that inhibits fibrinolysis by blocking activation of Glu-plasminogen; the competitive CPB inhibitor GEMSA completely abolishes this antifibrinolytic effect.\",\n      \"method\": \"Purification from plasma, in vitro clot lysis assay, amino-terminal sequence analysis, competitive inhibitor studies\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — original discovery with purification, enzymatic characterization, and functional reconstitution in a defined system\",\n      \"pmids\": [\"7782309\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"The thrombin-thrombomodulin complex is the primary physiological activator of TAFI; thrombomodulin increases the catalytic efficiency of TAFI activation 1250-fold (expressed almost exclusively as an increase in kcat), forming a ternary thrombin-thrombomodulin-TAFI complex with kcat = 1.2 s⁻¹ and Km = 1.0 µM for TAFI and Kd = 8.6 nM for thrombomodulin.\",\n      \"method\": \"Kinetic analysis of purified components, thrombomodulin titration, in vitro clot lysis assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — rigorous kinetics with purified components, replicated across multiple studies\",\n      \"pmids\": [\"8663147\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Activated protein C (APC) exerts its profibrinolytic effect predominantly through TAFI-dependent mechanisms: APC has no profibrinolytic effect in TAFI-immunodepleted plasma, and the effect is fully reconstituted by adding purified TAFI; monoclonal antibody blocking TAFI activation mimics APC's profibrinolytic effect.\",\n      \"method\": \"TAFI immunodepletion, reconstitution with purified TAFI, monoclonal antibody inhibition, turbidity-based clot lysis assay, ELISA (plasma TAFI concentration = 73 nM)\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — depletion/reconstitution with multiple orthogonal inhibitory approaches\",\n      \"pmids\": [\"8822928\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"TAFIa suppresses fibrinolysis by removing C-terminal lysine residues from partially degraded fibrin, thereby downregulating the cofactor function of fibrin in the fibrinolytic cascade; thrombin generation links coagulation to fibrinolytic suppression through this mechanism.\",\n      \"method\": \"In vitro clot lysis assays with purified components, CPB inhibitor studies\",\n      \"journal\": \"Thrombosis and haemostasis\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — biochemically established mechanism replicated across labs\",\n      \"pmids\": [\"9198184\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Meizothrombin, a thrombin intermediate, can activate TAFI in the presence of thrombomodulin, but is much less potent than thrombin in procoagulant functions, indicating differential substrate specificity in the thrombomodulin-dependent pathway.\",\n      \"method\": \"Recombinant expression of prothrombin mutants, kinetic assays for TAFI activation and protein C activation in presence of thrombomodulin\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — purified recombinant proteins but single study for TAFI-specific finding\",\n      \"pmids\": [\"9045633\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Recombinant TAFI (rTAFI) expressed in BHK cells has activation kinetics by thrombin/thrombomodulin indistinguishable from plasma TAFI (kcat ~0.55-0.61 s⁻¹, Km ~0.54-0.55 µM); activated TAFIa is intrinsically thermally unstable with a half-life of ~10 min at 37°C, and decay is associated with quenching of intrinsic fluorescence; competitive inhibitors GEMSA and ε-aminocaproic acid stabilize TAFIa.\",\n      \"method\": \"Stable BHK cell expression, purification, kinetics of activation, fluorescence spectroscopy, thermal stability assays, in vitro fibrinolysis assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple orthogonal methods including kinetics, biophysics, and functional assays\",\n      \"pmids\": [\"9442053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Activation of TAFI by thrombin occurs at Arg-92; the TAFI gene contains 11 exons spanning ~48 kb, shares conserved intron/exon boundaries with pancreatic carboxypeptidase genes, and a ~70 bp liver-specific promoter element was identified by transient transfection reporter assays.\",\n      \"method\": \"Genomic library cloning, exon mapping, transient transfection reporter assays, cDNA sequencing\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genomic characterization with functional promoter mapping in mammalian cells\",\n      \"pmids\": [\"10350473\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Two naturally occurring TAFI variants at position 325 (Thr vs. Ile) differ substantially in TAFIa thermal stability: Ile-325 TAFIa has a half-life of ~15 min vs. ~8 min for Thr-325 at 37°C, conferring ~60% greater antifibrinolytic potency, while the Ala-147/Thr-147 variation has minimal effect on enzymatic properties.\",\n      \"method\": \"Stable BHK cell expression of four variant combinations, purification, thermal stability assays, clot lysis assays, kinetics of activation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution with multiple purified variants, multiple orthogonal methods\",\n      \"pmids\": [\"11684677\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Thrombomodulin concentration determines the balance between fibrinolysis promotion (via protein C activation at high TM) and inhibition (via TAFI activation at low TM); protein C inhibitor (PCI) differentially regulates the thrombin-TM complex to modulate TAFI vs. protein C activation.\",\n      \"method\": \"Plasma-based clot lysis assays with varying thrombomodulin concentrations, TAFI activity measurement, protein C pathway inhibition\",\n      \"journal\": \"Thrombosis and haemostasis\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — replicated across two independent studies with consistent results\",\n      \"pmids\": [\"11204587\", \"11686324\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Protein S inhibits TAFI activation through two mechanisms: as an APC cofactor reducing maximum TAFIa activity, and independently of APC by inhibiting initial thrombin formation, thereby reducing the rate of TAFI activation.\",\n      \"method\": \"Protein S depletion from plasma, antibody inhibition, measurement of TAFI activation rate and maximum activity\",\n      \"journal\": \"Thrombosis and haemostasis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — depletion and antibody inhibition in plasma system, single lab\",\n      \"pmids\": [\"11686322\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Amino acids in the P6-P'3 region surrounding the Arg-92 activation cleavage site of TAFI do not determine thrombomodulin dependence of TAFI activation; thrombomodulin's role is to optimally orient thrombin and substrate rather than allosterically alter thrombin active-site specificity.\",\n      \"method\": \"Site-directed mutagenesis of TAFI activation site, expression in mammalian cells, kinetic analysis of activation by thrombin ± thrombomodulin\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis with kinetic analysis, single study\",\n      \"pmids\": [\"11786552\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Crystal structure of human pancreatic procarboxypeptidase B (the structural prototype for plasma TAFI/CPB2) at 1.6 Å resolution reveals a 95-residue pro-segment with globular + alpha-helical topology shielding a preformed active site; the active-site Zn-binding residue has two alternate conformations relevant to substrate binding.\",\n      \"method\": \"X-ray crystallography at 1.6 Å resolution\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution crystal structure with functional implications\",\n      \"pmids\": [\"12162965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"TAFI deficiency in mice (knockout) is compatible with life; TAFI-deficient mice fail to prolong clot lysis time in vitro but show no excess bleeding or altered occlusion times in arterial/venous injury models under normal conditions, and TAFI does not play a major role in bradykinin catabolism under basal conditions.\",\n      \"method\": \"Targeted gene disruption, in vitro clot lysis assay, tail transection bleeding assay, arterial/venous thrombosis models, bradykinin writhing test\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple phenotypic readouts in knockout mice across multiple labs\",\n      \"pmids\": [\"11781355\", \"11815293\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"TAFI is present in human platelets (~50 ng/10⁹ platelets), is secreted upon platelet activation, can be activated by thrombin/thrombomodulin similarly to plasma TAFI, and is synthesized in megakaryocytes (mRNA detected in megakaryocytic cell lines DAMI and CHRF); platelet-TAFI glycosylation differs from plasma TAFI.\",\n      \"method\": \"TAFI ELISA, Western blot, platelet activation assays, RT-PCR in megakaryocytic cell lines, thrombomodulin-dependent activation kinetics\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods establishing platelet TAFI source and function\",\n      \"pmids\": [\"12595308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Hyperprothrombinemia (prothrombin G20210A mutation) inhibits fibrinolysis through a TAFI-dependent mechanism: increased prothrombin generates more late thrombin, activates more TAFI, and a specific TAFIa inhibitor abolishes the difference in clot lysis time between carriers and non-carriers.\",\n      \"method\": \"TAFIa activity assay during clot lysis, specific TAFIa inhibitor (PTCI), purified prothrombin addition to normal plasma, plasma from G20210A carriers\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic link established by inhibitor rescue and purified component reconstitution\",\n      \"pmids\": [\"14630828\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"TAFIa zymogen (TAFI itself, before activation) exhibits continuous and stable carboxypeptidase activity against large peptide substrates, suggesting that the zymogen is not completely inactive and may down-regulate fibrinolysis constitutively in vivo.\",\n      \"method\": \"In vitro carboxypeptidase activity assay on purified zymogen with large peptide substrates\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — direct enzymatic assay, single study challenging previous dogma\",\n      \"pmids\": [\"17138567\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Limited mutagenesis of TAFIa can extend its half-life at 37°C from 0.2 h up to 5.5 h; increased stability correlates with thermostability and trypsin resistance; more stable TAFIa mutants more effectively down-regulate fibrinolysis than higher concentrations of less stable wild-type enzyme, demonstrating that TAFIa stability is a greater determinant of antifibrinolytic potency than zymogen concentration.\",\n      \"method\": \"Site-directed mutagenesis, thermal stability assays, trypsin susceptibility, in vitro clot lysis assays\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis with functional validation, single lab\",\n      \"pmids\": [\"16441664\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Crystal structures of TAFI, a TAFI-GEMSA inhibitor complex, and a quadruple TAFI mutant (70-fold more stable) reveal that TAFIa stability is governed by a dynamic 55-residue flap (residues 296-350) including active-site wall residues; in the zymogen, the activation peptide stabilizes this flap; after activation peptide release, increased flap mobility leads to conformational changes that disrupt the catalytic site and expose a cryptic thrombin-cleavage site at Arg302, establishing a novel auto-regulatory mechanism of enzyme inactivation.\",\n      \"method\": \"X-ray crystallography (TAFI, TAFI-GEMSA, and quadruple mutant), site-directed mutagenesis, thermal stability assays\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple crystal structures combined with mutagenesis and functional validation\",\n      \"pmids\": [\"18559974\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Crystal structure of TAFI at 2.1 Å reveals that the active site is accessible in the zymogen (explaining intrinsic activity), identifies an 'instability region' consistent with mutagenesis data, and identifies sulfate ions bound to this region pointing toward a potential heparin-binding site that could explain how heparin stabilizes TAFIa.\",\n      \"method\": \"X-ray crystallography, site-directed mutagenesis cross-validation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with mechanistic implications validated by prior mutagenesis\",\n      \"pmids\": [\"18669641\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Activated TAFI (CPB2) inactivates pro-inflammatory mediators bradykinin, C3a, C5a, and thrombin-cleaved osteopontin by removing C-terminal arginines; in vivo, proCPB-deficient mice show enhanced bradykinin-induced hypotension and enhanced C5a-induced pulmonary alveolitis, and a thrombin mutant (E229K) that selectively activates proCPB (not protein C) reverses these inflammatory phenotypes in wild-type but not proCPB-deficient mice.\",\n      \"method\": \"In vitro enzymatic assays, proCPB-deficient mouse models, in vivo infusion of E229K thrombin mutant, C5a-induced alveolitis model, inflammatory arthritis model\",\n      \"journal\": \"Molecular immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple in vivo models with knockout mice and selective activator, replicated across two papers\",\n      \"pmids\": [\"18706698\", \"19025114\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Pig thrombomodulin binds human thrombin but is a poor cofactor for activation of human TAFI (and protein C); domain-swapping experiments show that EGF5 of thrombomodulin is the most important determinant of species compatibility for TAFI activation.\",\n      \"method\": \"Cloning of pig TM, domain-swapping, transfection assays measuring TAFI activation efficiency\",\n      \"journal\": \"American journal of transplantation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — domain swapping with functional readout, single study\",\n      \"pmids\": [\"18444940\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Streptococcus pyogenes recruits and activates TAFI on its surface; activated TAFI processes bradykinin by C-terminal truncation, converting it from a B2 receptor ligand to a B1 receptor agonist, potentially redirecting inflammation from transient to chronic.\",\n      \"method\": \"Bacterial surface binding assays, TAFI activation assays, bradykinin processing, B1/B2 receptor signaling assays, electron microscopy\",\n      \"journal\": \"Journal of innate immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct enzymatic processing shown with receptor functional readout, single study\",\n      \"pmids\": [\"20375563\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Platelet factor 4 (PF4) inhibits thrombomodulin-dependent activation of TAFI by thrombin while simultaneously stimulating protein C activation, demonstrating that PF4 modulates the substrate specificity of the thrombin-TM complex to selectively suppress TAFIa-mediated antifibrinolytic and anti-inflammatory activities; N-acetylated heparin (NAc-Hep) blocks PF4 binding to TM and reverses this inhibition.\",\n      \"method\": \"In vitro clot lysis assays, bradykinin conversion assay, hemophilia A plasma, TM-expressing cell assays, competition binding experiments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple functional readouts with defined inhibitor mechanism, single lab\",\n      \"pmids\": [\"21041299\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"TAFI and pancreatic carboxypeptidase B inhibit in vitro capillary tube formation by human microvascular endothelial cells by removing C-terminal lysine residues from fibrin degradation products and from the cell surface, thereby impairing plasminogen-dependent endothelial cell migration (without affecting proliferation or adhesion).\",\n      \"method\": \"3D plasma clot matrix tube formation assay, fibrin degradation product measurement, cell migration assay, TAFIa inhibitor (PTCI)\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional assay with inhibitor and purified enzyme, single lab\",\n      \"pmids\": [\"17673703\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Activated TAFI (TAFIa) promotes development of chronic thromboembolic pulmonary hypertension (CTEPH): bone marrow transplantation shows that hepatic TAFI (not marrow-derived) is activated locally in pulmonary artery endothelial cells via thrombin-thrombomodulin; TAFIa increases PA endothelial permeability, smooth muscle cell proliferation, and monocyte/macrophage activation; TAFIa inhibitor reduces pulmonary hypertension in mouse and rat models.\",\n      \"method\": \"Bone marrow transplantation, overexpression of TAFIa in mice, TAFIa inhibitor treatment, immunostaining, clot lysis assays, hemodynamic measurements\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — bone marrow transplantation establishes cellular source; multiple mechanistic readouts in vivo\",\n      \"pmids\": [\"28289017\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"In double TAFI/PAI-1 knockout mice, TAFI deficiency predominantly determines enhanced fibrinolytic capacity as measured by thromboelastometry and fibrin deposition in a thromboembolism model, demonstrating that TAFI is a more critical fibrinolysis regulator than PAI-1 under the conditions tested.\",\n      \"method\": \"TAFI/PAI-1 double-knockout mouse generation, rotational thromboelastometry, thromboembolism model (fibrin deposition in lungs), tail vein bleeding model\",\n      \"journal\": \"Journal of thrombosis and haemostasis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis via double-KO with defined phenotypic readouts\",\n      \"pmids\": [\"23083123\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TAFI deficiency promotes liver damage in murine models: TAFI-knockout mice show accelerated fibrogenesis (increased α-SMA, pro-collagen α1), elevated liver enzymes, and increased neutrophil influx in CCl4-induced chronic liver injury, and increased necrosis after acetaminophen intoxication, linking TAFI's anti-inflammatory activity (via anaphylatoxin inactivation) to protection against liver inflammation.\",\n      \"method\": \"TAFI-knockout mice, CCl4-induced chronic liver injury, acetaminophen intoxication model, immunohistochemistry, ALT/AST measurement, hepatic fibrin deposition\",\n      \"journal\": \"Thrombosis and haemostasis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — knockout with multiple disease models, single lab\",\n      \"pmids\": [\"23467679\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Activation of TAFI during clot formation in plasma is largely factor XI-dependent (reduced ~65% by anti-factor XI antibody), occurs after clot formation via thrombin feedback, and requires conversion of approximately 50% of prothrombin to thrombin for full TAFI activation; the contact system (factor XII) is not required.\",\n      \"method\": \"Factor XI and factor XII neutralizing monoclonal antibodies, factor II-deficient plasma, specific TAFIa activity assay\",\n      \"journal\": \"Thrombosis and haemostasis\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — neutralizing antibodies and factor-deficient plasmas, replicated in 13 individuals\",\n      \"pmids\": [\"10613658\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"In a pedigree with thrombomodulin-associated coagulopathy carrying a stop-gain variant in CPB2 (encoding TAFI), co-inherited TAFI deficiency partially attenuates the delayed fibrinolysis caused by high thrombomodulin levels without affecting defective thrombin generation, directly confirming that TM-dependent TAFI activation mediates the fibrinolytic delay.\",\n      \"method\": \"Next-generation sequencing, plasma TAFI level measurement, clot lysis assays, thrombin generation assays in human pedigree members\",\n      \"journal\": \"Journal of thrombosis and haemostasis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — natural genetic epistasis in human pedigree with functional phenotyping\",\n      \"pmids\": [\"32634856\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CPB2 (TAFI/plasma procarboxypeptidase B) is a hepatically synthesized plasma zymogen that is activated proteolytically at Arg-92 by the thrombin-thrombomodulin complex (primary physiological activator, 1250-fold more efficient than free thrombin) or by plasmin; the resulting active enzyme (TAFIa) removes C-terminal lysine residues from partially degraded fibrin to suppress fibrinolysis, cleaves C-terminal arginines from bradykinin, C3a, and C5a to dampen inflammation, and spontaneously inactivates within ~10 minutes at 37°C via a dynamic 55-residue flap mechanism that disrupts its catalytic site after release of the activation peptide, as revealed by crystal structures; its activity is further regulated by thrombomodulin concentration, protein C/protein S axis, platelet factor 4, and natural polymorphisms at position 325 (Thr/Ile) that alter TAFIa half-life and antifibrinolytic potency.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CPB2 (thrombin-activatable fibrinolysis inhibitor, TAFI) is a hepatically and megakaryocyte-synthesized plasma zymogen that functions as a central regulator linking coagulation, fibrinolysis, and inflammation. The zymogen is cleaved at Arg-92 by the thrombin–thrombomodulin complex—which enhances activation 1250-fold over free thrombin—to generate TAFIa, a carboxypeptidase B-like enzyme that removes C-terminal lysine and arginine residues from partially degraded fibrin (suppressing plasminogen recruitment and fibrinolysis), bradykinin, C3a, C5a, and osteopontin (dampening inflammation) [PMID:7782309, PMID:8663147, PMID:18706698]. TAFIa is intrinsically unstable (half-life ~8–15 min at 37 °C depending on the Thr325Ile polymorphism), and crystal structures reveal that this instability is governed by a dynamic 55-residue flap (residues 296–350) that becomes mobile upon activation-peptide release, disrupting the catalytic site and exposing a cryptic thrombin-cleavage site at Arg302 [PMID:18559974, PMID:11684677]. TAFIa activity is further tuned by thrombomodulin concentration, the protein C/protein S anticoagulant axis, platelet factor 4, and factor XI–dependent thrombin feedback, establishing TAFI as a dose- and time-sensitive rheostat that balances clot stability against fibrinolytic and inflammatory resolution [PMID:8822928, PMID:11204587, PMID:21041299, PMID:10613658].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Identification of a novel plasma protein that couples thrombin generation to fibrinolytic suppression resolved how coagulation directly attenuates plasminogen activation on fibrin.\",\n      \"evidence\": \"Purification of a 60-kDa zymogen from human plasma, thrombin cleavage to 35-kDa active form, inhibition of Glu-plasminogen activation on fibrin, reversal by CPB inhibitor GEMSA\",\n      \"pmids\": [\"7782309\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological activator not yet identified (free thrombin is inefficient)\", \"In vivo relevance not established\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Demonstration that the thrombin–thrombomodulin complex is the physiological activator of TAFI (1250-fold enhancement) and that activated protein C exerts its profibrinolytic effect through TAFI-dependent suppression of thrombin generation established the regulatory logic connecting the anticoagulant and fibrinolytic pathways.\",\n      \"evidence\": \"Kinetic analysis with purified thrombin/TM/TAFI showing kcat increase; TAFI immunodepletion/reconstitution showing APC profibrinolytic effect is entirely TAFI-dependent\",\n      \"pmids\": [\"8663147\", \"8822928\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of thrombomodulin cofactor effect unknown\", \"In vivo activation kinetics not measured\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Characterization of TAFIa's intrinsic thermal instability (~10 min half-life at 37 °C) revealed that the enzyme self-limits its antifibrinolytic effect, making stability rather than concentration the key determinant of activity.\",\n      \"evidence\": \"Recombinant TAFI expression in BHK cells, fluorescence spectroscopy showing conformational decay, competitive inhibitor stabilization\",\n      \"pmids\": [\"9442053\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of instability unknown\", \"Physiological significance of self-inactivation not tested in vivo\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Mapping the activation cleavage site to Arg-92, characterizing the gene structure (11 exons, liver-specific promoter), and showing that factor XI–dependent thrombin feedback (not contact activation) drives TAFI activation during clot formation placed TAFI within the intrinsic coagulation amplification loop.\",\n      \"evidence\": \"Genomic cloning and reporter assays for promoter; factor XI/XII neutralizing antibodies and factor II-deficient plasma for pathway mapping\",\n      \"pmids\": [\"10350473\", \"10613658\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Factor XI dependence measured in plasma system only; in vivo contribution not tested\", \"Promoter regulation beyond liver-specific element not characterized\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Discovery that the common Thr325Ile polymorphism nearly doubles TAFIa half-life and increases antifibrinolytic potency by ~60% established a genetic determinant of fibrinolytic capacity, while thrombomodulin concentration and protein S were shown to tune the balance between TAFI and protein C activation.\",\n      \"evidence\": \"Expression of four TAFI variant combinations in BHK cells with stability/clot lysis assays; TM titration experiments; protein S depletion/reconstitution\",\n      \"pmids\": [\"11684677\", \"11204587\", \"11686322\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Population-level thrombotic risk from Ile325 not definitively established\", \"Protein S APC-independent mechanism not fully dissected\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"TAFI-knockout mice demonstrated that TAFI is dispensable for normal hemostasis and baseline bradykinin catabolism but is required for thrombin-dependent prolongation of clot lysis, establishing it as a conditional rather than constitutive regulator.\",\n      \"evidence\": \"Targeted gene disruption in mice; clot lysis, bleeding, arterial/venous thrombosis, and bradykinin writhing tests\",\n      \"pmids\": [\"11781355\", \"11815293\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Inflammatory challenge phenotypes not yet tested\", \"Compensatory mechanisms not excluded\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Detection of TAFI in human platelets with secretion upon activation and synthesis in megakaryocytes identified a local, non-hepatic source of TAFI that could contribute to thrombus-proximal antifibrinolytic activity.\",\n      \"evidence\": \"ELISA, Western blot, RT-PCR in megakaryocytic lines DAMI/CHRF, thrombomodulin-dependent activation kinetics\",\n      \"pmids\": [\"12595308\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative contribution of platelet vs. plasma TAFI to hemostasis not established\", \"Glycosylation differences' functional significance unclear\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Crystal structures of TAFI, TAFI–GEMSA complex, and a hyperstable quadruple mutant revealed that a 55-residue dynamic flap (296–350) is stabilized by the activation peptide in the zymogen; upon activation-peptide release, increased flap mobility disrupts the catalytic site and exposes Arg302 to thrombin cleavage, providing the structural basis for TAFIa's built-in self-inactivation timer.\",\n      \"evidence\": \"X-ray crystallography of multiple TAFI forms (2.1 Å), mutagenesis cross-validation, thermal stability assays\",\n      \"pmids\": [\"18559974\", \"18669641\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No time-resolved structural data capturing intermediate states of flap opening\", \"In vivo confirmation of Arg302 cleavage pathway not established\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"In vivo evidence that TAFIa inactivates bradykinin, C3a, and C5a by C-terminal arginine removal—using proCPB-deficient mice and a selective thrombin mutant activator—established TAFI as a physiological anti-inflammatory enzyme beyond its antifibrinolytic role.\",\n      \"evidence\": \"proCPB-knockout mice, E229K thrombin mutant selective for TAFI activation, bradykinin-induced hypotension model, C5a-induced alveolitis model\",\n      \"pmids\": [\"18706698\", \"19025114\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative quantitative contribution of TAFI vs. other carboxypeptidases (CPN) to anaphylatoxin clearance not resolved\", \"Chronic inflammatory disease models limited\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Platelet factor 4 was shown to selectively inhibit thrombomodulin-dependent TAFI activation while stimulating protein C activation, revealing an additional layer of substrate-specific modulation of the thrombin–TM complex.\",\n      \"evidence\": \"In vitro clot lysis, bradykinin conversion assay, NAc-heparin competition binding on TM-expressing cells\",\n      \"pmids\": [\"21041299\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo relevance of PF4-mediated TAFI inhibition not tested\", \"Structural basis of PF4–TM interaction not resolved\", \"Single-lab finding\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"TAFI deficiency promoted liver fibrogenesis and necrosis in injury models, linking TAFI's anti-inflammatory function (anaphylatoxin inactivation) to organ protection beyond the vascular compartment.\",\n      \"evidence\": \"TAFI-knockout mice in CCl4-induced chronic liver injury and acetaminophen intoxication models with histological and biochemical endpoints\",\n      \"pmids\": [\"23467679\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism assumed to be via C3a/C5a inactivation but not directly tested with anaphylatoxin measurements\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Bone marrow transplantation experiments demonstrated that hepatic (not marrow-derived) TAFI is activated locally in pulmonary artery endothelium via thrombin–TM, driving vascular remodeling in chronic thromboembolic pulmonary hypertension.\",\n      \"evidence\": \"Bone marrow transplantation, TAFIa overexpression in mice, TAFIa inhibitor treatment, hemodynamic measurements in mouse/rat CTEPH models\",\n      \"pmids\": [\"28289017\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Human CTEPH causation vs. association not established\", \"Specific substrate responsible for vascular remodeling not identified\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"A human pedigree carrying a CPB2 stop-gain variant confirmed that TM-dependent TAFI activation mediates delayed fibrinolysis in vivo, providing natural genetic epistasis evidence in humans.\",\n      \"evidence\": \"Next-generation sequencing, plasma TAFI levels, clot lysis and thrombin generation assays in family members with high-TM coagulopathy\",\n      \"pmids\": [\"32634856\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single pedigree observation\", \"Complete TAFI deficiency phenotype in humans not fully characterized\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural dynamics of the flap transition in real time, the quantitative partitioning of TAFI's antifibrinolytic versus anti-inflammatory roles in human disease, and whether pharmacological TAFIa inhibition can safely enhance fibrinolysis without exacerbating inflammation.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No time-resolved structural data for the inactivation conformational change\", \"No human clinical trial data for selective TAFIa inhibitors\", \"Relative contribution of platelet-derived vs. plasma TAFI in vivo not quantified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 3, 5, 15, 19]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0, 3, 5, 17, 19]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0, 1, 5, 13]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [13]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-109582\", \"supporting_discovery_ids\": [0, 1, 3, 14, 25, 27]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [19, 26]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 1, 5, 7]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"THBD\",\n      \"F2\",\n      \"PLG\",\n      \"PF4\",\n      \"PROS1\",\n      \"PROC\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}