{"gene":"LCAT","run_date":"2026-06-10T02:59:49","timeline":{"discoveries":[{"year":1998,"finding":"LCAT belongs to the α/β hydrolase fold family and contains a catalytic triad composed of Ser (active site), Asp345, and His377, with Phe103 and Leu182 forming the oxyanion hole. A potential 'lid' domain at residues 50–74 is proposed to be involved in enzyme–substrate interaction. These residues were identified by site-directed mutagenesis combined with expression in Cos-1 cells and enzymatic activity assays.","method":"Threading-based structural homology modeling, site-directed mutagenesis, expression in Cos-1 cells, ELISA for LCAT mass, enzymatic activity assays on rHDL, LDL, and monomeric substrate","journal":"Protein science","confidence":"High","confidence_rationale":"Tier 1 / Moderate — active-site mutagenesis with functional validation in cell expression system, multiple catalytic residues identified with orthogonal activity assays","pmids":["9541390"],"is_preprint":false},{"year":2015,"finding":"The 2.65 Å crystal structure of human LCAT reveals an α/β hydrolase core with two additional subdomains: subdomain 1 contains the region required for interfacial activation, and subdomain 2 contains the lid and amino acids shaping the substrate-binding pocket. Mapping naturally occurring disease mutations onto the structure provides mechanistic insight into how they impair enzymatic activity.","method":"X-ray crystallography at 2.65 Å resolution; crystallization required enzymatic removal of N-linked glycans and complex formation with a Fab fragment","journal":"Journal of lipid research","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution crystal structure with structural validation and disease-mutation mapping","pmids":["26195816"],"is_preprint":false},{"year":1997,"finding":"Targeted disruption of the mouse LCAT gene demonstrated that LCAT is essential for normal plasma cholesterol esterification, HDL cholesterol levels, and apoA-I levels. LCAT-null mice had >99% reduction in LCAT activity, markedly reduced HDL cholesterol (7% of normal) and apoA-I (12% of normal), elevated triglycerides in males, and accumulation of heterogeneous prebeta-migrating HDL particles. LCAT absence also attenuated the rise in apoB-containing lipoproteins in response to a high-fat/high-cholesterol diet.","method":"Gene knockout in mouse embryonic stem cells; plasma lipid/lipoprotein analysis by FPLC and two-dimensional gel electrophoresis; dietary challenge","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with multiple defined phenotypic readouts, replicated across multiple dietary conditions","pmids":["9054454"],"is_preprint":false},{"year":2018,"finding":"ApoA-I on nascent discoidal HDL can adopt at least two helical registries (5/5 and 5/2). HDL particles locked in the 5/2 registry by engineered disulfide bonds significantly impaired LCAT cholesteryl esterification activity despite equal LCAT binding, whereas the 5/5 registry supported full activity. Chemical cross-linking data suggest full LCAT activation requires a hybrid epitope composed of helices 5–7 on one apoA-I molecule and helices 3–4 on the other, consistent with a thumbwheel-like activation mechanism.","method":"Engineered disulfide bond formation at predicted registry positions, cholesterol efflux assays in macrophages, LCAT esterification activity assays, chemical cross-linking","journal":"Journal of lipid research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstitution with engineered disulfide-locked particles and multiple orthogonal functional assays in a single rigorous study","pmids":["29773713"],"is_preprint":false},{"year":2001,"finding":"LCAT directly binds α2-macroglobulin (α2M) in human plasma to form a complex (~18.5 nm diameter); ~40% of plasma LCAT-HDL is associated with α2M. LCAT associated with α2M is enzymatically inactive. The LCAT–α2M complex (but not free LCAT) binds to, is internalized by, and is degraded in LRP-expressing cells, identifying an α2M/LRP receptor-mediated pathway for LCAT clearance.","method":"Purification of plasma complex, radiolabeled rLCAT binding assays to native and methylamine-activated α2M in vitro, enzymatic activity assays, cell-based internalization/degradation assays in LRP(+/+) vs. LRP(-/-) cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal binding assays, functional activity measurements, and cell-based clearance assay with isogenic LRP-deficient control cells","pmids":["11435418"],"is_preprint":false},{"year":2005,"finding":"ApoE is the major physiological activator of LCAT on apoB-containing lipoproteins. In apoA-I(-/-)apoE(-/-) mouse plasma, cholesterol esterification rate (CER) was <7% of wild-type despite retaining 1/3 of LCAT enzyme activity, demonstrating that substrate/cofactor deficiency rather than enzyme amount explained low CER. Reconstitution experiments showed that LDL particles lacking apoE were very poor LCAT substrates, and adding apoE to apoA-I(-/-)apoE(-/-) VLDL gave a 3-fold increase in CER, whereas adding apoA-I gave only an 80% increase.","method":"Genetic mouse models (apoA-I KO, apoE KO, combined KO), in vitro LCAT assays with isolated LDL/VLDL particles from each genotype, apolipoprotein reconstitution experiments, Western blot","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro reconstitution with purified recombinant LCAT, multiple genetically defined substrates, direct comparison of apoE vs apoA-I activation","pmids":["15654758"],"is_preprint":false},{"year":2000,"finding":"Fish-eye disease (FED)-associated LCAT natural mutants T123I and N391S have decreased phospholipase A2 activity on rHDL, which accounts for their decreased acyltransferase activity specifically toward HDL. Engineered mutation F382A (designed from 3D model) phenocopied the T123I FED mutant. Residues T123 and F382 (N-terminal of helices α3-4 and αHis) contribute specifically to LCAT–HDL interaction, while residues N131 and N391 are critical for optimal orientation of amphipathic helices for lipoprotein substrate recognition.","method":"Site-directed mutagenesis of LCAT, overexpression in Cos-1 cells, esterase activity on monomeric substrate, phospholipase A2 activity on rHDL, acyltransferase activity on rHDL and LDL","journal":"Journal of lipid research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — structure-guided mutagenesis with multiple enzymatic activity assays across different substrates in a single systematic study","pmids":["10787436"],"is_preprint":false},{"year":2005,"finding":"Negatively charged residues in helix 6 of apoA-I attenuate LCAT activation. A strong inverse correlation (r = 0.85) was found between LCAT catalytic efficiency and apoA-I helix 6 net negative charge across engineered apoA-I mutants reconstituted into HDL particles of two different sizes, supporting direct protein–protein interaction between helix 6 and LCAT.","method":"Site-directed mutagenesis of apoA-I helix 6 charged residues, reconstituted HDL preparation of two sizes, in vitro LCAT kinetic assays (Km, Vmax, catalytic efficiency)","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with mutagenesis and kinetic analysis across multiple particle sizes and charge variants","pmids":["15807534"],"is_preprint":false},{"year":1995,"finding":"Nascent apoA-I-lipid discoidal complexes formed by apoA-I recruiting phospholipid and cholesterol from cell membranes serve as substrates for LCAT, which converts them into ~8.4 nm particles similar in size to plasma HDL3a LpA-I particles. In contrast, nascent apoA-II-lipid complexes could not serve as substrates for LCAT and did not undergo transformation, demonstrating apolipoprotein specificity of LCAT activation.","method":"Cell incubation with purified apoA-I or apoA-II to generate nascent HDL, incubation with purified LCAT, electron microscopy, non-denaturing PAGE gel analysis of particle sizes","journal":"Journal of lipid research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with purified LCAT and cell-derived nascent HDL, structural characterization by EM, direct comparison of apoA-I vs apoA-II substrates","pmids":["7706940"],"is_preprint":false},{"year":2007,"finding":"ABCA1 is essential for apoE-containing HDL biogenesis (ABCA1-/- mice failed to form apoE-HDL particles after apoE4 adenovirus transfer). LCAT is required for the conversion of discoidal apoE-containing HDL into spherical HDL particles: co-infection with apoE4 and human LCAT adenoviruses converted discoidal HDL into spherical HDL and cleared triglyceride-rich lipoproteins in apoA-I-/- mice.","method":"Adenovirus-mediated gene transfer in apoA-I-/-, ABCA1-/-, and apoE-/- mice; electron microscopy of HDL particles; plasma lipid/lipoprotein analysis","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic epistasis via adenoviral expression in multiple KO backgrounds with EM structural verification","pmids":["17206937"],"is_preprint":false},{"year":2012,"finding":"Formation of spherical α-migrating apoA-IV-containing HDL particles requires both ABCA1 and LCAT. Gene transfer of apoA-IV in ABCA1-/- or LCAT-/- mice failed to generate spherical or α-migrating HDL particles, and co-expression of apoA-IV with LCAT in apoA-I-/- mice restored HDL-A-IV formation.","method":"Adenovirus-mediated gene transfer in ABCA1-/-, LCAT-/-, and apoA-I-/- mice; electron microscopy; lipid analysis","journal":"Journal of lipid research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic epistasis in multiple KO backgrounds with rescue experiment and EM structural verification","pmids":["23132909"],"is_preprint":false},{"year":2007,"finding":"ApoA-I mutations Leu141Arg (Pisa) and Leu159Arg (FIN) diminish the capacity of apoA-I to activate LCAT in vitro and in vivo, causing accumulation of discoidal prebeta1-HDL. Co-treatment with human LCAT adenovirus normalized plasma apoA-I, HDL cholesterol, CE/TC ratio, and HDL subpopulations in apoA-I-/- mice expressing these mutants, demonstrating that impaired LCAT activation is the primary defect.","method":"In vitro LCAT activation assay, adenovirus-mediated gene transfer in apoA-I-/- mice, HDL subpopulation analysis, rescue with LCAT co-expression","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo functional assays, genetic rescue with LCAT, multiple complementary readouts","pmids":["17711302"],"is_preprint":false},{"year":2007,"finding":"ApoA-I mutations R151C (Paris), R160L (Oslo), and engineered R149A greatly reduce LCAT activation capacity in vitro and cause accumulation of discoidal HDL in vivo. Co-expression of LCAT with each mutant in apoA-I-/- mice normalized HDL cholesterol, apoA-I levels, CE/TC ratio, and converted discoidal to spherical HDL particles.","method":"In vitro LCAT activation assay, adenovirus gene transfer in apoA-I-/- mice, electron microscopy, 2D gel HDL subpopulation analysis, rescue with LCAT co-expression","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo complementary assays with genetic rescue and structural verification","pmids":["17506726"],"is_preprint":false},{"year":2016,"finding":"Lipoprotein X (LpX), which accumulates when LCAT is absent, is nephrotoxic and causes all histological hallmarks of familial LCAT deficiency renal disease. An apoA-I- and LCAT-dependent pathway converts LpX to HDL-like particles and mediates normal plasma clearance. LpX is taken up by macropinocytosis into glomerular endothelial cells, podocytes, and mesangial cells, delivered to lysosomes for degradation, induces podocyte secretion of pro-inflammatory IL-6, and causes proteinuria when chronically administered to Lcat-/- mice.","method":"Synthetic LpX administration to wild-type and Lcat-/- mice, in vitro LpX-to-HDL conversion assay, EM (TEM/SEM) of kidney, proteinuria measurements, in vitro cytokine assays in podocytes and mesangial cells","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal in vivo and in vitro methods, LpX conversion assay, cellular uptake pathway defined by EM, functional IL-6 readout","pmids":["26919698"],"is_preprint":false},{"year":2004,"finding":"Accumulation of LpX particles (vesicular lipoprotein X) in plasma in the absence of LCAT is strongly associated with spontaneous glomerulopathy. A novel mouse model (SREBP1a transgenic × LCAT-/- ) that selectively accumulates LpX developed glomerular lipid deposits, mesangial expansion, foam cell infiltrates, hyalinosis, and tubulointerstitial lipid deposits by 6–10 months, histologically similar to human LCAT deficiency nephropathy.","method":"SREBP1a Tg × lcat-/- mouse model, FPLC plasma lipoprotein fractionation, electron microscopy of LpX, renal histology, immunohistochemistry (RhoA)","journal":"The American journal of pathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo model with defined genetic background and structural/histological phenotyping, single lab","pmids":["15466392"],"is_preprint":false},{"year":2018,"finding":"Recombinant human LCAT (rhLCAT) enzyme replacement reduces LpX in plasma and kidneys and markedly decreases proteinuria in LCAT-deficient mice expressing abundant LpX, demonstrating that restoring LCAT esterification activity is sufficient to prevent LpX accumulation and renal injury.","method":"Intravenous rhLCAT injection in PRCL diet-fed SREBP1a Tg × Lcat-/- mice; plasma lipoprotein profiling; transmission EM; urine albumin/creatinine ratio measurement","journal":"The Journal of pharmacology and experimental therapeutics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo rescue experiment with defined mechanistic readouts, single lab","pmids":["30563940"],"is_preprint":false},{"year":2003,"finding":"LCAT-dependent conversion of prebeta1-HDL to alpha-migrating HDL is the primary mechanism by which prebeta1-HDL is catabolized in plasma, as demonstrated by: (1) time-course incubation at 37°C showing LCAT-inhibitor-sensitive decrease in prebeta1-HDL, and (2) a positive correlation between LCAT activity and the rate of prebeta1-HDL decrease (r = 0.617, P<0.001) in hemodialysis patients vs. controls.","method":"Ex vivo plasma incubation at 37°C with and without LCAT inhibitor, prebeta1-HDL quantification by immunoassay, correlation analysis","journal":"Journal of the American Society of Nephrology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological inhibitor-controlled ex vivo assay demonstrating LCAT dependence, replicated across patient and control groups","pmids":["12595510"],"is_preprint":false},{"year":2002,"finding":"LCAT is the only source of plasma long-chain polyunsaturated cholesteryl esters (20:4, 20:5n-3, 22:6n-3) in mouse plasma, demonstrating that LCAT generates a distinct subset of plasma cholesteryl ester species. Removal of functional LCAT from LDLr-/- mice caused a 7-fold increase in the saturated/polyunsaturated CE ratio in LDL due to complete absence of long-chain polyunsaturated CE.","method":"LCAT-/- × LDLr-/- and LCAT-/- × apoE-/- double-knockout mice; plasma cholesteryl ester fatty acid composition analysis","journal":"Journal of lipid research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic ablation in two independent mouse backgrounds with detailed fatty acid compositional analysis","pmids":["11893779"],"is_preprint":false},{"year":2007,"finding":"Decreased LCAT reactivity (not decreased LCAT protein or mRNA) with sphingomyelin-enriched HDL particles accounts for the functional LCAT deficiency observed in hA-ITg SR-BI-/- mice. HDL from these mice was enriched in sphingomyelin relative to phosphatidylcholine and had less associated LCAT radiolabel and endogenous LCAT activity, whereas LCAT protein, hepatic mRNA, and in vivo turnover were similar to controls.","method":"Radiolabeled LCAT turnover studies (35S), LCAT mass measurement, hepatic mRNA quantification, HDL lipid composition analysis, in vitro LCAT activity assays on isolated HDL fractions","journal":"Journal of lipid research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods distinguishing enzyme mass/turnover from substrate reactivity, single lab","pmids":["17272829"],"is_preprint":false},{"year":2021,"finding":"LCAT is secreted predominantly in medium and small HDL (alpha2, alpha3, prebeta) fractions, and unlike PLTP and CETP, shows markedly delayed appearance on HDL after secretion, indicating that LCAT resides for a time outside systemic circulation before associating with HDL in plasma. Compartmental modeling of in vivo deuterium-labeled tracer data revealed these distinct metabolic properties.","method":"In vivo isotope tracer study with Orbitrap Fusion Lumos MS, compartmental modeling of protein kinetics on multiple HDL sizes from 6 participants","journal":"JCI insight","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo tracer with compartmental modeling in human subjects, novel mechanistic insight, single study","pmids":["33351780"],"is_preprint":false},{"year":2002,"finding":"IL-6 induces LCAT transcription via a minimal response element at −1514 to −1508 bp in the distal LCAT promoter with high homology to a STAT3 binding site. Overexpression of STAT3 significantly enhanced IL-6-induced LCAT promoter activity. Sequential deletion constructs mapped this element as sufficient for IL-6 responsiveness in transfected HepG2 cells.","method":"LCAT promoter-reporter deletion constructs, transfection in HepG2 cells, IL-6 treatment, STAT3 overexpression","journal":"Journal of lipid research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter deletion mapping with functional rescue by STAT3 overexpression, single lab","pmids":["12032172"],"is_preprint":false},{"year":2015,"finding":"Increased LCAT cholesterol esterification activity in Scarb1-/- × LCAT-transgenic mice reduced plasma free cholesterol/total cholesterol ratio to normal, decreased VLDL-cholesterol levels, and produced a 51% reduction in aortic sinus atherosclerosis compared to Scarb1-/- mice, demonstrating an antiatherogenic role for LCAT-mediated cholesterol esterification independent of SR-BI.","method":"Genetic mouse models (Scarb1-/- × LCAT-null and Scarb1-/- × LCAT-Tg), high-fat diet challenge, aortic sinus lesion quantification, plasma lipoprotein profiling, in vitro cholesterol efflux assay","journal":"Journal of lipid research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean genetic model with dose-response (null vs Tg) and defined atherosclerosis quantification, single lab","pmids":["25964513"],"is_preprint":false},{"year":2010,"finding":"A novel apoA-I mutation S36A, identified in a hypoalphalipoproteinemic patient, reduces apoA-I self-association (shifts from oligomeric to primarily monomeric form) and significantly impairs LCAT activation while preserving phospholipid vesicle solubilization and lipoprotein surface binding capacity, implicating the N-terminal region around S36 in apoA-I–LCAT interaction.","method":"Recombinant protein production, guanidine denaturation, native PAGE, chemical cross-linking, sedimentation equilibrium, phospholipid vesicle solubilization assay, in vitro LCAT activation assay","journal":"Journal of lipid research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple biophysical and biochemical methods on recombinant protein with direct LCAT activity readout, single lab","pmids":["20884842"],"is_preprint":false},{"year":2019,"finding":"LCAT concentration and activity decrease significantly during STEMI (acute myocardial infarction), and this decrease correlates with impaired HDL-mediated endothelial NO production. In vitro addition of recombinant human LCAT to STEMI patient plasma restores HDL ability to promote endothelial NO production, associated with significant modification of HDL phospholipid classes.","method":"Prospective clinical measurement of LCAT mass and activity, in vitro rhLCAT supplementation of patient plasma, NO production assay in cultured endothelial cells, HDL phospholipid composition analysis","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological rescue experiment (rhLCAT addition) with mechanistic readout (NO production), correlation with clinical LCAT levels, single lab","pmids":["30894011"],"is_preprint":false},{"year":1985,"finding":"LCAT activity drives the in vitro conversion of HDL3 to lower-density HDL2a in whole plasma. Removal of VLDL/LDL by precipitation shifted the conversion toward higher-density particles, and adding back triglyceride-rich lipoproteins (TGRLP) at ratios ≥2.5:1 caused nearly complete conversion of HDL3 to HDL2b in an LCAT-dependent manner.","method":"In vitro incubation of whole plasma with and without active LCAT; selective lipoprotein precipitation; addition of TGRLP or Intralipid; analytical ultracentrifugation","journal":"Journal of lipid research","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with enzymatic inhibition controls and multiple substrate conditions","pmids":["3989387"],"is_preprint":false},{"year":1995,"finding":"In vitro glycation of HDL (the LCAT substrate) alters LCAT kinetics: moderate glycation increases both Km and Vmax but decreases overall enzyme reactivity (Vmax/Km); high glycation reduces both Km and Vmax markedly, further decreasing reactivity. The decrease is attributed to glycation of lysine residues in apoA-I rather than altered lipid or protein composition of HDL.","method":"In vitro HDL glycation with glucose/sodium cyanoborohydride, TNBS assay for glycation extent, kinetic analysis (Km, Vmax) of purified LCAT on glycated vs. native HDL","journal":"Clinica chimica acta","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single in vitro kinetic study, mechanism attributed by inference without direct mutagenesis of apoA-I lysine residues","pmids":["7758222"],"is_preprint":false},{"year":2020,"finding":"DS-8190a, a small-molecule LCAT activator, directly binds human LCAT protein (confirmed by affinity purification with immobilized DS-8190a beads and thermal shift assay) and activates human and cynomolgus monkey but not mouse LCAT in vitro. In vivo oral dosing in cynomolgus monkeys increased LCAT activity ~2-fold. In Ldlr-KO × hLcat-Tg mice, DS-8190a reduced atherosclerotic lesion area by 48% and enhanced reverse cholesterol transport.","method":"In vitro LCAT activation assay, affinity purification with compound-immobilized beads, thermal shift assay, photoaffinity labeling for binding site, oral dosing in cynomolgus monkeys, atherosclerosis lesion quantification, [3H]-cholesterol reverse cholesterol transport assay","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct binding confirmed by two independent biochemical methods (affinity purification and thermal shift), functional activation in vitro and in vivo, single study with multiple orthogonal approaches","pmids":["33086872"],"is_preprint":false},{"year":2013,"finding":"Recombinant human LCAT (rhLCAT) corrects lipoprotein abnormalities in LCAT-deficient human plasma in vitro: reduces unesterified cholesterol by 30%, increases plasma cholesteryl esters by 210%, increases HDL-C by 89%, matures small prebeta-HDL into alpha-migrating particles, and converts abnormal phospholipid-rich LDL-region particles to normally sized LDL.","method":"In vitro incubation of LCAT-deficient plasma with rhLCAT; lipoprotein profiling; HDL subpopulation analysis","journal":"Biologicals","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro reconstitution demonstrating functional rescue, single lab, no mechanistic dissection","pmids":["24140107"],"is_preprint":false},{"year":2024,"finding":"Estrogen upregulates LCAT expression in liver in an ESR1-dependent manner. LCAT facilitates HDL-C production and uptake via LDLR and SCARB1 pathways. Enhanced HDL-C absorption induced by LCAT impairs SREBP2 maturation, suppressing cholesterol biosynthesis and dampening HCC cell proliferation. SREBF2 overexpression abolished LCAT's inhibitory activity on HCC cells.","method":"Transcriptomic analysis of mouse and human liver cancer, in vitro LCAT overexpression/knockdown in HCC cells, in vivo xenograft and orthotopic mouse models, LCAT-KO female mice with ovariectomy, HDL-C treatment, SREBP2 Western blot","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple in vitro and in vivo models with epistasis (SREBF2 overexpression rescue) defining pathway position, single lab","pmids":["38718297"],"is_preprint":false},{"year":2015,"finding":"LCAT deficiency reduces the LPS-neutralizing capacity of HDL and enhances LPS-induced inflammation in mice. Lcat-/- HDL lacks significant amounts of apoA-I and apoA-II and is primarily composed of apoE. Reintroducing LCAT expression via adenovirus-mediated gene transfer reverted the enhanced inflammatory phenotype to wild-type. Lcat-/- mice also show increased circulating Cd11b+Ly6Cmed monocyte numbers.","method":"LPS challenge in Lcat-/- mice, ex vivo whole blood LPS stimulation, in vitro RAW264.7 macrophage TNFα assay with Lcat-/- serum/HDL/lipoprotein fractions, adenoviral LCAT rescue, flow cytometric immunophenotyping","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO phenotype with genetic rescue and in vitro fraction dissection, single lab","pmids":["26170061"],"is_preprint":false},{"year":2012,"finding":"HDL-cholesteryl ester deficiency in LCAT KO mice (complete absence of HDL-CE due to LCAT absence) results in a 40–50% lower glucocorticoid response to ACTH stimulation, endotoxemia, or fasting, despite normal basal corticosterone. Adrenal cells show compensatory upregulation of HMG-CoA reductase (516%) and LDL receptor (385%), indicating that HDL-derived CE is a major cholesterol source for adrenal steroidogenesis.","method":"LCAT KO mouse model, ACTH stimulation, endotoxemia, and fasting protocols; corticosterone measurement; quantitative gene expression of cholesterol metabolism genes; neutral lipid staining of adrenal tissue","journal":"Journal of lipid research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean genetic model with multiple physiological challenges and compensatory gene expression analysis, single lab","pmids":["23178225"],"is_preprint":false},{"year":2013,"finding":"An inhibitory anti-LCAT antibody in a patient's serum caused acquired LCAT deficiency with nephrotic syndrome histologically identical to familial LCAT deficiency. A mixing test and co-immunoprecipitation confirmed the presence of the antibody and its inhibitory effect. LCAT was detected by immunohistochemistry along glomerular capillary walls, indicating LCAT as a glomerular antigen. Steroid treatment restored LCAT activity and resolved the renal and lipid phenotype.","method":"Mixing test for LCAT inhibitory antibody, co-immunoprecipitation, renal biopsy histology/EM, LCAT immunohistochemistry/immunofluorescence, treatment with steroids","journal":"Journal of the American Society of Nephrology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single patient case with co-IP and histological evidence, but no mechanistic dissection of the antibody epitope","pmids":["23620397"],"is_preprint":false},{"year":1993,"finding":"Mutations dispersed throughout the LCAT gene (rather than clustered at the presumed active site) cause loss of enzymatic activity, suggesting multiple structurally important domains. In homozygous deficiency patients with missense mutations, residual LCAT mass was detectable but functionally inactive; null mutations (nonsense, frameshift) eliminated both mass and activity.","method":"DNA sequencing of all LCAT exons, mutagenic primer-based restriction analysis, LCAT activity and mass measurement in patients and family heterozygotes","journal":"The Journal of clinical investigation","confidence":"Low","confidence_rationale":"Tier 3 / Weak — genetic analysis without in vitro functional characterization of specific mutants; mechanistic inference from genotype–phenotype correlation","pmids":["8432868"],"is_preprint":false},{"year":2020,"finding":"ApoA-I in mouse cerebrospinal fluid originates from liver and intestine via plasma spherical HDL, which is regulated by ABCA1 and LCAT. Knockout of apoA-I in both intestine and liver virtually eliminated CSF apoA-I, and CSF apoA-I levels correlated with plasma spherical HDL levels regulated by ABCA1 and LCAT.","method":"Tissue-specific Apoa1 knockout mice (intestine-specific, liver-specific, double-KO); immunoassay for apoA-I in plasma and CSF; plasma HDL profiling","journal":"FEBS letters","confidence":"Low","confidence_rationale":"Tier 3 / Weak — LCAT's role inferred from correlation of CSF apoA-I with LCAT-regulated spherical HDL, not directly tested by LCAT manipulation","pmids":["33020907"],"is_preprint":false}],"current_model":"LCAT is a plasma α/β hydrolase that uses a Ser/Asp345/His377 catalytic triad (with Phe103/Leu182 forming the oxyanion hole and a lid domain at residues 50–74 mediating substrate access, as resolved in the 2.65 Å crystal structure) to transfer the sn-2 acyl chain from phosphatidylcholine to cholesterol, generating cholesteryl esters; on HDL this reaction is activated by apoA-I acting through a specific helical registry (5/5 thumbwheel) involving helices 5–7 and 3–4, with negatively charged residues in helix 6 attenuating reactivity, while apoE is the dominant activator on apoB-containing lipoproteins; LCAT converts discoidal prebeta-HDL into mature spherical alpha-HDL and is essential—together with ABCA1—for HDL biogenesis, the products of which supply cholesterol for adrenal steroidogenesis, brain CSF transport, and LPS neutralization; when LCAT is absent, the nephrotoxic lipoprotein X (LpX) accumulates, is taken up by glomerular cells via macropinocytosis, triggers IL-6 secretion, and causes renal disease; plasma LCAT is cleared via an alpha2-macroglobulin complex recognized by the LRP receptor; and LCAT transcription is upregulated by IL-6 through a STAT3-binding element in its distal promoter and by estrogen through ESR1, the latter suppressing hepatocellular carcinoma by reducing SREBP2-driven cholesterol biosynthesis."},"narrative":{"mechanistic_narrative":"LCAT is a plasma α/β-hydrolase that esterifies cholesterol on lipoproteins and is the central enzyme driving maturation of high-density lipoprotein (HDL) [PMID:9541390, PMID:9054454]. Catalysis proceeds through a Ser/Asp345/His377 triad with Phe103 and Leu182 forming the oxyanion hole and a lid domain (residues 50–74) controlling substrate access, an architecture confirmed by the 2.65 Å crystal structure that resolves a hydrolase core plus subdomains for interfacial activation and substrate-pocket shaping [PMID:9541390, PMID:26195816]. The enzyme transfers an acyl chain from phosphatidylcholine to cholesterol; on HDL this requires apoA-I as an activator, acting through a defined helical registry—the active 5/5 thumbwheel configuration engaging helices 5–7 and 3–4, with negatively charged helix-6 residues attenuating activity—whereas apoA-II-bound particles are not substrates and apoE is the dominant activator on apoB-containing lipoproteins [PMID:29773713, PMID:15654758, PMID:15807534, PMID:7706940]. Through this reaction LCAT, together with ABCA1, converts discoidal prebeta-HDL into mature spherical α-HDL and generates the bulk of plasma cholesteryl esters including the long-chain polyunsaturated species [PMID:17206937, PMID:23132909, PMID:12595510, PMID:11893779]. Loss of LCAT in mice abolishes cholesterol esterification, collapses HDL cholesterol and apoA-I, and causes accumulation of the nephrotoxic vesicular lipoprotein X (LpX), which is taken up by glomerular cells via macropinocytosis, drives IL-6 secretion, and produces renal disease resembling familial LCAT deficiency; recombinant LCAT replacement reverses LpX accumulation and proteinuria [PMID:9054454, PMID:26919698, PMID:15466392, PMID:30563940]. LCAT-derived cholesteryl ester additionally supplies cholesterol for adrenal steroidogenesis, supports HDL antiatherogenic and LPS-neutralizing functions, and its expression is regulated by IL-6 through a STAT3 element in the distal promoter and by estrogen via ESR1, the latter suppressing hepatocellular carcinoma by limiting SREBP2-driven cholesterol synthesis [PMID:12032172, PMID:25964513, PMID:38718297, PMID:26170061, PMID:23178225]. Plasma LCAT is cleared as an enzymatically inactive complex with α2-macroglobulin recognized by the LRP receptor [PMID:11435418].","teleology":[{"year":1993,"claim":"Establishing whether LCAT loss-of-function arose from active-site lesions alone defined whether the protein had multiple functionally critical domains.","evidence":"Sequencing of all LCAT exons and mass/activity measurement in deficiency patients and heterozygotes","pmids":["8432868"],"confidence":"Low","gaps":["No in vitro functional characterization of individual mutants","Mechanism inferred from genotype–phenotype correlation only"]},{"year":1995,"claim":"Defining which apolipoproteins generate competent LCAT substrate particles established apolipoprotein specificity in HDL maturation.","evidence":"Cell-derived nascent apoA-I vs apoA-II lipid complexes incubated with purified LCAT, EM and native PAGE","pmids":["7706940"],"confidence":"High","gaps":["Did not resolve the apoA-I structural features required for activation","In vitro reconstitution only"]},{"year":1997,"claim":"A clean knockout determined the in vivo necessity of LCAT for plasma cholesterol esterification and HDL homeostasis.","evidence":"Mouse LCAT gene disruption with FPLC and 2D-gel lipoprotein phenotyping under dietary challenge","pmids":["9054454"],"confidence":"High","gaps":["Did not address downstream pathophysiology such as renal or steroidogenic consequences","Mouse-only physiology"]},{"year":1998,"claim":"Identifying the catalytic triad and oxyanion hole placed LCAT mechanistically within the α/β-hydrolase fold and defined its active site.","evidence":"Homology modeling plus site-directed mutagenesis expressed in Cos-1 cells with activity assays","pmids":["9541390"],"confidence":"High","gaps":["Lid domain role proposed but not structurally resolved","No experimental 3D structure at this stage"]},{"year":2001,"claim":"Discovering the LCAT–α2-macroglobulin complex defined the receptor-mediated route for plasma LCAT clearance.","evidence":"Complex purification, radiolabeled binding assays, and internalization/degradation in LRP(+/+) vs LRP(−/−) cells","pmids":["11435418"],"confidence":"High","gaps":["Physiological regulation of this clearance pathway not quantified","Binding interface on LCAT not mapped"]},{"year":2005,"claim":"Comparing apoE and apoA-I activation across genetic substrate backgrounds established apoE as the dominant activator on apoB-containing lipoproteins.","evidence":"apoA-I/apoE KO mouse plasma, in vitro LCAT assays on genotype-defined LDL/VLDL, apolipoprotein reconstitution","pmids":["15654758"],"confidence":"High","gaps":["Structural basis of apoE-driven activation not defined","Did not address relative contribution in human lipoproteins"]},{"year":2007,"claim":"Genetic epistasis fixed LCAT's position downstream of ABCA1 in converting discoidal to spherical HDL across multiple apolipoprotein scaffolds.","evidence":"Adenoviral apoE4/apoA-IV plus LCAT transfer in ABCA1−/−, LCAT−/−, apoA-I−/− mice with EM verification","pmids":["17206937","23132909"],"confidence":"High","gaps":["Did not dissect the molecular interface of LCAT with each apolipoprotein","Particle remodeling kinetics not resolved"]},{"year":2007,"claim":"Mapping disease and engineered apoA-I mutations that block LCAT activation showed impaired activation is the primary defect causing discoidal HDL accumulation.","evidence":"In vitro activation assays plus adenoviral mutant expression and LCAT rescue in apoA-I−/− mice with 2D-gel and EM readouts","pmids":["17711302","17506726","10787436"],"confidence":"High","gaps":["Did not produce a co-structure of LCAT with apoA-I","Residue-level interaction inferred from activity, not direct binding"]},{"year":2018,"claim":"Disulfide-locking apoA-I registries demonstrated that activation depends on a specific helical configuration (5/5 thumbwheel) rather than on LCAT binding alone.","evidence":"Engineered disulfide-locked rHDL, esterification assays, and chemical cross-linking","pmids":["29773713"],"confidence":"High","gaps":["The hybrid epitope model not confirmed by direct structure","Dynamics of the thumbwheel during catalysis unresolved"]},{"year":2015,"claim":"The crystal structure provided a definitive framework linking catalytic and interfacial-activation subdomains to disease mutations.","evidence":"X-ray crystallography at 2.65 Å with deglycosylation and Fab-complex crystallization","pmids":["26195816"],"confidence":"High","gaps":["Structure lacks bound lipoprotein substrate","Lid conformational change during activation not captured"]},{"year":2016,"claim":"Defining LpX as the nephrotoxic species and its uptake route explained the renal pathology of LCAT deficiency at the cellular level.","evidence":"Synthetic LpX administration to WT and Lcat−/− mice, EM of kidney, IL-6 cytokine assays in glomerular cells","pmids":["26919698","15466392"],"confidence":"High","gaps":["Receptor/macropinocytosis trigger on glomerular cells not molecularly identified","Link between IL-6 and proteinuria not fully causal"]},{"year":2018,"claim":"Enzyme-replacement experiments established that restoring esterification activity is sufficient to prevent LpX-driven renal injury.","evidence":"Intravenous rhLCAT in SREBP1a Tg × Lcat−/− mice with EM and albumin/creatinine readouts","pmids":["30563940","24140107"],"confidence":"Medium","gaps":["Single lab in vivo rescue","Durability and dosing in human disease not established"]},{"year":2024,"claim":"Connecting estrogen/ESR1 regulation of LCAT to SREBP2-dependent cholesterol synthesis revealed a transcriptional and tumor-suppressive axis beyond lipoprotein metabolism.","evidence":"LCAT overexpression/knockdown in HCC cells, xenograft/orthotopic models, ovariectomized LCAT-KO mice, SREBF2 rescue","pmids":["38718297"],"confidence":"Medium","gaps":["Direct ESR1 binding at the LCAT locus not demonstrated","Generality across cancer contexts unknown"]},{"year":null,"claim":"How LCAT physically docks onto its lipoprotein substrate during interfacial activation, and the structural transitions of the lid coupled to apoA-I registry, remain unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No co-structure of LCAT with HDL or apoA-I","Conformational coupling between lid opening and catalysis not visualized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,5,6,17]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[0,1,6]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[2,4,19]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[2,9,17,21]},{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[9,16,24]}],"complexes":["LCAT–alpha2-macroglobulin complex","HDL"],"partners":["APOA1","APOE","APOA4","A2M","LRP1","STAT3"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P04180","full_name":"Phosphatidylcholine-sterol acyltransferase","aliases":["1-alkyl-2-acetylglycerophosphocholine esterase","Lecithin-cholesterol acyltransferase","Phospholipid-cholesterol acyltransferase","Platelet-activating factor acetylhydrolase","PAF acetylhydrolase"],"length_aa":440,"mass_kda":49.6,"function":"Central enzyme in the extracellular metabolism of plasma lipoproteins. Synthesized mainly in the liver and secreted into plasma where it converts cholesterol and phosphatidylcholines (lecithins) to cholesteryl esters and lysophosphatidylcholines on the surface of high and low density lipoproteins (HDLs and LDLs) (PubMed:10329423, PubMed:19065001, PubMed:26195816). The cholesterol ester is then transported back to the liver. Has a preference for plasma 16:0-18:2 or 18:O-18:2 phosphatidylcholines (PubMed:8820107). Also produced in the brain by primary astrocytes, and esterifies free cholesterol on nascent APOE-containing lipoproteins secreted from glia and influences cerebral spinal fluid (CSF) APOE- and APOA1 levels. Together with APOE and the cholesterol transporter ABCA1, plays a key role in the maturation of glial-derived, nascent lipoproteins. Required for remodeling high-density lipoprotein particles into their spherical forms (PubMed:10722751). Catalyzes the hydrolysis of 1-O-alkyl-2-acetyl-sn-glycero-3-phosphocholine (platelet-activating factor or PAF) to 1-O-alkyl-sn-glycero-3-phosphocholine (lyso-PAF) (PubMed:8016111). Also catalyzes the transfer of the acetate group from PAF to 1-hexadecanoyl-sn-glycero-3-phosphocholine forming lyso-PAF (PubMed:8016111). Catalyzes the esterification of (24S)-hydroxycholesterol (24(S)OH-C), also known as cerebrosterol to produce 24(S)OH-C monoesters (PubMed:24620755)","subcellular_location":"Secreted","url":"https://www.uniprot.org/uniprotkb/P04180/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/LCAT","classification":"Not Classified","n_dependent_lines":3,"n_total_lines":1208,"dependency_fraction":0.0024834437086092716},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/LCAT","total_profiled":1310},"omim":[{"mim_id":"619836","title":"HYPOALPHALIPOPROTEINEMIA, PRIMARY, 2, INTERMEDIATE","url":"https://www.omim.org/entry/619836"},{"mim_id":"618979","title":"HIGH DENSITY LIPOPROTEIN CHOLESTEROL LEVEL QUANTITATIVE TRAIT LOCUS 7; HDLCQ7","url":"https://www.omim.org/entry/618979"},{"mim_id":"618463","title":"HYPOALPHALIPOPROTEINEMIA, PRIMARY, 2","url":"https://www.omim.org/entry/618463"},{"mim_id":"613381","title":"CYSTATHIONINE BETA-SYNTHASE; CBS","url":"https://www.omim.org/entry/613381"},{"mim_id":"609362","title":"PHOSPHOLIPASE A2, GROUP XV; PLA2G15","url":"https://www.omim.org/entry/609362"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"liver","ntpm":275.5}],"url":"https://www.proteinatlas.org/search/LCAT"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"P04180","domains":[{"cath_id":"3.40.50.1820","chopping":"25-57_127-418","consensus_level":"medium","plddt":91.1981,"start":25,"end":418},{"cath_id":"-","chopping":"60-123","consensus_level":"medium","plddt":91.6525,"start":60,"end":123}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P04180","model_url":"https://alphafold.ebi.ac.uk/files/AF-P04180-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P04180-F1-predicted_aligned_error_v6.png","plddt_mean":86.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=LCAT","jax_strain_url":"https://www.jax.org/strain/search?query=LCAT"},"sequence":{"accession":"P04180","fasta_url":"https://rest.uniprot.org/uniprotkb/P04180.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P04180/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P04180"}},"corpus_meta":[{"pmid":"16501936","id":"PMC_16501936","title":"Role of apoA-I, ABCA1, LCAT, and SR-BI in the biogenesis of HDL.","date":"2006","source":"Journal of molecular medicine (Berlin, Germany)","url":"https://pubmed.ncbi.nlm.nih.gov/16501936","citation_count":297,"is_preprint":false},{"pmid":"9162740","id":"PMC_9162740","title":"The molecular pathology of lecithin:cholesterol acyltransferase (LCAT) deficiency syndromes.","date":"1997","source":"Journal of lipid research","url":"https://pubmed.ncbi.nlm.nih.gov/9162740","citation_count":260,"is_preprint":false},{"pmid":"12668499","id":"PMC_12668499","title":"Increased low-density lipoprotein oxidation and impaired high-density lipoprotein antioxidant defense are associated with increased macrophage homing and atherosclerosis in dyslipidemic obese mice: LCAT gene transfer decreases atherosclerosis.","date":"2003","source":"Circulation","url":"https://pubmed.ncbi.nlm.nih.gov/12668499","citation_count":146,"is_preprint":false},{"pmid":"16061733","id":"PMC_16061733","title":"Compromised LCAT function is associated with increased atherosclerosis.","date":"2005","source":"Circulation","url":"https://pubmed.ncbi.nlm.nih.gov/16061733","citation_count":135,"is_preprint":false},{"pmid":"7320631","id":"PMC_7320631","title":"Lecithin:cholesterol acyltransferase (LCAT) mass; its relationship to LCAT activity and cholesterol esterification rate.","date":"1981","source":"Journal of lipid research","url":"https://pubmed.ncbi.nlm.nih.gov/7320631","citation_count":105,"is_preprint":false},{"pmid":"9054454","id":"PMC_9054454","title":"Targeted disruption of the mouse lecithin:cholesterol acyltransferase (LCAT) gene. 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reductase, cholesterol 7alpha-hydroxylase, LCAT, ACAT, LDL receptor, and SRB-1 in hereditary analbuminemia.","date":"2003","source":"Kidney international","url":"https://pubmed.ncbi.nlm.nih.gov/12787409","citation_count":24,"is_preprint":false},{"pmid":"34256778","id":"PMC_34256778","title":"LCAT deficiency: a systematic review with the clinical and genetic description of Mexican kindred.","date":"2021","source":"Lipids in health and disease","url":"https://pubmed.ncbi.nlm.nih.gov/34256778","citation_count":23,"is_preprint":false},{"pmid":"24140107","id":"PMC_24140107","title":"Recombinant human LCAT normalizes plasma lipoprotein profile in LCAT deficiency.","date":"2013","source":"Biologicals : journal of the International Association of Biological Standardization","url":"https://pubmed.ncbi.nlm.nih.gov/24140107","citation_count":23,"is_preprint":false},{"pmid":"20884842","id":"PMC_20884842","title":"Novel N-terminal mutation of human apolipoprotein A-I reduces self-association and impairs LCAT activation.","date":"2010","source":"Journal of lipid research","url":"https://pubmed.ncbi.nlm.nih.gov/20884842","citation_count":22,"is_preprint":false},{"pmid":"32998975","id":"PMC_32998975","title":"Progression of chronic kidney disease in familial LCAT deficiency: a follow-up of the Italian cohort.","date":"2020","source":"Journal of lipid research","url":"https://pubmed.ncbi.nlm.nih.gov/32998975","citation_count":22,"is_preprint":false},{"pmid":"168146","id":"PMC_168146","title":"Lipoproteins in lecithin-cholesterol-acyltransferase(LCAT)-deficiency. II. Further studies on the abnormal high-density-lipoproteins.","date":"1975","source":"Humangenetik","url":"https://pubmed.ncbi.nlm.nih.gov/168146","citation_count":22,"is_preprint":false},{"pmid":"30563940","id":"PMC_30563940","title":"LCAT Enzyme Replacement Therapy Reduces LpX and Improves Kidney Function in a Mouse Model of Familial LCAT Deficiency.","date":"2018","source":"The Journal of pharmacology and experimental therapeutics","url":"https://pubmed.ncbi.nlm.nih.gov/30563940","citation_count":21,"is_preprint":false},{"pmid":"1350465","id":"PMC_1350465","title":"A DNA polymorphism for LCAT is associated with altered LCAT activity and high density lipoprotein size distributions in baboons.","date":"1992","source":"Arteriosclerosis and thrombosis : a journal of vascular biology","url":"https://pubmed.ncbi.nlm.nih.gov/1350465","citation_count":21,"is_preprint":false},{"pmid":"23178225","id":"PMC_23178225","title":"LCAT deficiency in mice is associated with a diminished adrenal glucocorticoid function.","date":"2012","source":"Journal of lipid research","url":"https://pubmed.ncbi.nlm.nih.gov/23178225","citation_count":20,"is_preprint":false},{"pmid":"24174160","id":"PMC_24174160","title":"Characteristic kidney pathology, gene abnormality and treatments in LCAT deficiency.","date":"2013","source":"Clinical and experimental nephrology","url":"https://pubmed.ncbi.nlm.nih.gov/24174160","citation_count":19,"is_preprint":false},{"pmid":"23522979","id":"PMC_23522979","title":"Amelioration of circulating lipoprotein profile and proteinuria in a patient with LCAT deficiency due to a novel mutation (Cys74Tyr) in the lid region of LCAT under a fat-restricted diet and ARB treatment.","date":"2013","source":"Atherosclerosis","url":"https://pubmed.ncbi.nlm.nih.gov/23522979","citation_count":19,"is_preprint":false},{"pmid":"28351888","id":"PMC_28351888","title":"Depletion in LpA-I:A-II particles enhances HDL-mediated endothelial protection in familial LCAT deficiency.","date":"2017","source":"Journal of lipid research","url":"https://pubmed.ncbi.nlm.nih.gov/28351888","citation_count":19,"is_preprint":false},{"pmid":"33351780","id":"PMC_33351780","title":"Metabolism of PLTP, CETP, and LCAT on multiple HDL sizes using the Orbitrap Fusion Lumos.","date":"2021","source":"JCI insight","url":"https://pubmed.ncbi.nlm.nih.gov/33351780","citation_count":18,"is_preprint":false},{"pmid":"17272829","id":"PMC_17272829","title":"Functional LCAT deficiency in human apolipoprotein A-I transgenic, SR-BI knockout mice.","date":"2007","source":"Journal of lipid research","url":"https://pubmed.ncbi.nlm.nih.gov/17272829","citation_count":18,"is_preprint":false},{"pmid":"33020907","id":"PMC_33020907","title":"Apolipoprotein A-I in mouse cerebrospinal fluid derives from the liver and intestine via plasma high-density lipoproteins assembled by ABCA1 and LCAT.","date":"2020","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/33020907","citation_count":17,"is_preprint":false},{"pmid":"33086872","id":"PMC_33086872","title":"Novel LCAT (Lecithin:Cholesterol Acyltransferase) Activator DS-8190a Prevents the Progression of Plaque Accumulation in Atherosclerosis Models.","date":"2020","source":"Arteriosclerosis, thrombosis, and vascular biology","url":"https://pubmed.ncbi.nlm.nih.gov/33086872","citation_count":17,"is_preprint":false},{"pmid":"8656071","id":"PMC_8656071","title":"Two novel point mutations in the lecithin:cholesterol acyltransferase (LCAT) gene resulting in LCAT deficiency: LCAT (G873 deletion) and LCAT (Gly344-->Ser).","date":"1995","source":"Journal of lipid research","url":"https://pubmed.ncbi.nlm.nih.gov/8656071","citation_count":17,"is_preprint":false},{"pmid":"7474298","id":"PMC_7474298","title":"CETP and LCAT activities are unrelated to smoking and moderate alcohol consumption in healthy normolipidemic men.","date":"1995","source":"Japanese circulation journal","url":"https://pubmed.ncbi.nlm.nih.gov/7474298","citation_count":17,"is_preprint":false},{"pmid":"22108153","id":"PMC_22108153","title":"Homozygous lecithin:cholesterol acyltransferase (LCAT) deficiency due to a new loss of function mutation and review of the literature.","date":"2011","source":"Journal of clinical lipidology","url":"https://pubmed.ncbi.nlm.nih.gov/22108153","citation_count":16,"is_preprint":false},{"pmid":"6754140","id":"PMC_6754140","title":"Plasma LCAT activities in renal allograft recipients.","date":"1982","source":"Clinica chimica acta; international journal of clinical chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/6754140","citation_count":16,"is_preprint":false},{"pmid":"9180249","id":"PMC_9180249","title":"Familial lecithin:cholesterol acyltransferase deficiency: molecular analysis of a compound heterozygote: LCAT (Arg147 --> Trp) and LCAT (Tyr171 --> Stop).","date":"1997","source":"Atherosclerosis","url":"https://pubmed.ncbi.nlm.nih.gov/9180249","citation_count":16,"is_preprint":false},{"pmid":"33867422","id":"PMC_33867422","title":"Current Status of Familial LCAT Deficiency in Japan.","date":"2021","source":"Journal of atherosclerosis and thrombosis","url":"https://pubmed.ncbi.nlm.nih.gov/33867422","citation_count":15,"is_preprint":false},{"pmid":"33298249","id":"PMC_33298249","title":"Common plasma protein marker LCAT in aggressive human breast cancer and canine mammary tumor.","date":"2020","source":"BMB reports","url":"https://pubmed.ncbi.nlm.nih.gov/33298249","citation_count":15,"is_preprint":false},{"pmid":"10869098","id":"PMC_10869098","title":"Physical and genetic mapping of the macular corneal dystrophy locus on chromosome 16q and exclusion of TAT and LCAT as candidate genes.","date":"2000","source":"Molecular vision","url":"https://pubmed.ncbi.nlm.nih.gov/10869098","citation_count":15,"is_preprint":false},{"pmid":"9261271","id":"PMC_9261271","title":"Molecular basis of fish-eye disease in a patient from Spain. Characterization of a novel mutation in the LCAT gene and lipid analysis of the cornea.","date":"1997","source":"Arteriosclerosis, thrombosis, and vascular biology","url":"https://pubmed.ncbi.nlm.nih.gov/9261271","citation_count":15,"is_preprint":false},{"pmid":"12032172","id":"PMC_12032172","title":"Identification of an IL-6 response element in the human LCAT promoter.","date":"2002","source":"Journal of lipid research","url":"https://pubmed.ncbi.nlm.nih.gov/12032172","citation_count":15,"is_preprint":false},{"pmid":"11590219","id":"PMC_11590219","title":"Alteration of plasma HDL cholesteryl ester composition with transgenic expression of a point mutation (E149A) of human LCAT.","date":"2001","source":"Journal of lipid research","url":"https://pubmed.ncbi.nlm.nih.gov/11590219","citation_count":15,"is_preprint":false},{"pmid":"3068599","id":"PMC_3068599","title":"Familial lecithin: cholesterol acyltransferase (LCAT) deficiency. An updated review Spring 1988.","date":"1988","source":"Ophthalmic paediatrics and genetics","url":"https://pubmed.ncbi.nlm.nih.gov/3068599","citation_count":14,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":55062,"output_tokens":9733,"usd":0.15559,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":20318,"output_tokens":4025,"usd":0.101108,"stage2_stop_reason":"end_turn"},"total_usd":0.256698,"stage1_batch_id":"msgbatch_01BbTCMyrRPyhtEq6b1MdwCN","stage2_batch_id":"msgbatch_011dEed5bbxYvTAaQWKJevxu","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1998,\n      \"finding\": \"LCAT belongs to the α/β hydrolase fold family and contains a catalytic triad composed of Ser (active site), Asp345, and His377, with Phe103 and Leu182 forming the oxyanion hole. A potential 'lid' domain at residues 50–74 is proposed to be involved in enzyme–substrate interaction. These residues were identified by site-directed mutagenesis combined with expression in Cos-1 cells and enzymatic activity assays.\",\n      \"method\": \"Threading-based structural homology modeling, site-directed mutagenesis, expression in Cos-1 cells, ELISA for LCAT mass, enzymatic activity assays on rHDL, LDL, and monomeric substrate\",\n      \"journal\": \"Protein science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — active-site mutagenesis with functional validation in cell expression system, multiple catalytic residues identified with orthogonal activity assays\",\n      \"pmids\": [\"9541390\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The 2.65 Å crystal structure of human LCAT reveals an α/β hydrolase core with two additional subdomains: subdomain 1 contains the region required for interfacial activation, and subdomain 2 contains the lid and amino acids shaping the substrate-binding pocket. Mapping naturally occurring disease mutations onto the structure provides mechanistic insight into how they impair enzymatic activity.\",\n      \"method\": \"X-ray crystallography at 2.65 Å resolution; crystallization required enzymatic removal of N-linked glycans and complex formation with a Fab fragment\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution crystal structure with structural validation and disease-mutation mapping\",\n      \"pmids\": [\"26195816\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Targeted disruption of the mouse LCAT gene demonstrated that LCAT is essential for normal plasma cholesterol esterification, HDL cholesterol levels, and apoA-I levels. LCAT-null mice had >99% reduction in LCAT activity, markedly reduced HDL cholesterol (7% of normal) and apoA-I (12% of normal), elevated triglycerides in males, and accumulation of heterogeneous prebeta-migrating HDL particles. LCAT absence also attenuated the rise in apoB-containing lipoproteins in response to a high-fat/high-cholesterol diet.\",\n      \"method\": \"Gene knockout in mouse embryonic stem cells; plasma lipid/lipoprotein analysis by FPLC and two-dimensional gel electrophoresis; dietary challenge\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with multiple defined phenotypic readouts, replicated across multiple dietary conditions\",\n      \"pmids\": [\"9054454\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ApoA-I on nascent discoidal HDL can adopt at least two helical registries (5/5 and 5/2). HDL particles locked in the 5/2 registry by engineered disulfide bonds significantly impaired LCAT cholesteryl esterification activity despite equal LCAT binding, whereas the 5/5 registry supported full activity. Chemical cross-linking data suggest full LCAT activation requires a hybrid epitope composed of helices 5–7 on one apoA-I molecule and helices 3–4 on the other, consistent with a thumbwheel-like activation mechanism.\",\n      \"method\": \"Engineered disulfide bond formation at predicted registry positions, cholesterol efflux assays in macrophages, LCAT esterification activity assays, chemical cross-linking\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstitution with engineered disulfide-locked particles and multiple orthogonal functional assays in a single rigorous study\",\n      \"pmids\": [\"29773713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"LCAT directly binds α2-macroglobulin (α2M) in human plasma to form a complex (~18.5 nm diameter); ~40% of plasma LCAT-HDL is associated with α2M. LCAT associated with α2M is enzymatically inactive. The LCAT–α2M complex (but not free LCAT) binds to, is internalized by, and is degraded in LRP-expressing cells, identifying an α2M/LRP receptor-mediated pathway for LCAT clearance.\",\n      \"method\": \"Purification of plasma complex, radiolabeled rLCAT binding assays to native and methylamine-activated α2M in vitro, enzymatic activity assays, cell-based internalization/degradation assays in LRP(+/+) vs. LRP(-/-) cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal binding assays, functional activity measurements, and cell-based clearance assay with isogenic LRP-deficient control cells\",\n      \"pmids\": [\"11435418\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"ApoE is the major physiological activator of LCAT on apoB-containing lipoproteins. In apoA-I(-/-)apoE(-/-) mouse plasma, cholesterol esterification rate (CER) was <7% of wild-type despite retaining 1/3 of LCAT enzyme activity, demonstrating that substrate/cofactor deficiency rather than enzyme amount explained low CER. Reconstitution experiments showed that LDL particles lacking apoE were very poor LCAT substrates, and adding apoE to apoA-I(-/-)apoE(-/-) VLDL gave a 3-fold increase in CER, whereas adding apoA-I gave only an 80% increase.\",\n      \"method\": \"Genetic mouse models (apoA-I KO, apoE KO, combined KO), in vitro LCAT assays with isolated LDL/VLDL particles from each genotype, apolipoprotein reconstitution experiments, Western blot\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro reconstitution with purified recombinant LCAT, multiple genetically defined substrates, direct comparison of apoE vs apoA-I activation\",\n      \"pmids\": [\"15654758\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Fish-eye disease (FED)-associated LCAT natural mutants T123I and N391S have decreased phospholipase A2 activity on rHDL, which accounts for their decreased acyltransferase activity specifically toward HDL. Engineered mutation F382A (designed from 3D model) phenocopied the T123I FED mutant. Residues T123 and F382 (N-terminal of helices α3-4 and αHis) contribute specifically to LCAT–HDL interaction, while residues N131 and N391 are critical for optimal orientation of amphipathic helices for lipoprotein substrate recognition.\",\n      \"method\": \"Site-directed mutagenesis of LCAT, overexpression in Cos-1 cells, esterase activity on monomeric substrate, phospholipase A2 activity on rHDL, acyltransferase activity on rHDL and LDL\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — structure-guided mutagenesis with multiple enzymatic activity assays across different substrates in a single systematic study\",\n      \"pmids\": [\"10787436\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Negatively charged residues in helix 6 of apoA-I attenuate LCAT activation. A strong inverse correlation (r = 0.85) was found between LCAT catalytic efficiency and apoA-I helix 6 net negative charge across engineered apoA-I mutants reconstituted into HDL particles of two different sizes, supporting direct protein–protein interaction between helix 6 and LCAT.\",\n      \"method\": \"Site-directed mutagenesis of apoA-I helix 6 charged residues, reconstituted HDL preparation of two sizes, in vitro LCAT kinetic assays (Km, Vmax, catalytic efficiency)\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with mutagenesis and kinetic analysis across multiple particle sizes and charge variants\",\n      \"pmids\": [\"15807534\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Nascent apoA-I-lipid discoidal complexes formed by apoA-I recruiting phospholipid and cholesterol from cell membranes serve as substrates for LCAT, which converts them into ~8.4 nm particles similar in size to plasma HDL3a LpA-I particles. In contrast, nascent apoA-II-lipid complexes could not serve as substrates for LCAT and did not undergo transformation, demonstrating apolipoprotein specificity of LCAT activation.\",\n      \"method\": \"Cell incubation with purified apoA-I or apoA-II to generate nascent HDL, incubation with purified LCAT, electron microscopy, non-denaturing PAGE gel analysis of particle sizes\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with purified LCAT and cell-derived nascent HDL, structural characterization by EM, direct comparison of apoA-I vs apoA-II substrates\",\n      \"pmids\": [\"7706940\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"ABCA1 is essential for apoE-containing HDL biogenesis (ABCA1-/- mice failed to form apoE-HDL particles after apoE4 adenovirus transfer). LCAT is required for the conversion of discoidal apoE-containing HDL into spherical HDL particles: co-infection with apoE4 and human LCAT adenoviruses converted discoidal HDL into spherical HDL and cleared triglyceride-rich lipoproteins in apoA-I-/- mice.\",\n      \"method\": \"Adenovirus-mediated gene transfer in apoA-I-/-, ABCA1-/-, and apoE-/- mice; electron microscopy of HDL particles; plasma lipid/lipoprotein analysis\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis via adenoviral expression in multiple KO backgrounds with EM structural verification\",\n      \"pmids\": [\"17206937\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Formation of spherical α-migrating apoA-IV-containing HDL particles requires both ABCA1 and LCAT. Gene transfer of apoA-IV in ABCA1-/- or LCAT-/- mice failed to generate spherical or α-migrating HDL particles, and co-expression of apoA-IV with LCAT in apoA-I-/- mice restored HDL-A-IV formation.\",\n      \"method\": \"Adenovirus-mediated gene transfer in ABCA1-/-, LCAT-/-, and apoA-I-/- mice; electron microscopy; lipid analysis\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis in multiple KO backgrounds with rescue experiment and EM structural verification\",\n      \"pmids\": [\"23132909\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"ApoA-I mutations Leu141Arg (Pisa) and Leu159Arg (FIN) diminish the capacity of apoA-I to activate LCAT in vitro and in vivo, causing accumulation of discoidal prebeta1-HDL. Co-treatment with human LCAT adenovirus normalized plasma apoA-I, HDL cholesterol, CE/TC ratio, and HDL subpopulations in apoA-I-/- mice expressing these mutants, demonstrating that impaired LCAT activation is the primary defect.\",\n      \"method\": \"In vitro LCAT activation assay, adenovirus-mediated gene transfer in apoA-I-/- mice, HDL subpopulation analysis, rescue with LCAT co-expression\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo functional assays, genetic rescue with LCAT, multiple complementary readouts\",\n      \"pmids\": [\"17711302\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"ApoA-I mutations R151C (Paris), R160L (Oslo), and engineered R149A greatly reduce LCAT activation capacity in vitro and cause accumulation of discoidal HDL in vivo. Co-expression of LCAT with each mutant in apoA-I-/- mice normalized HDL cholesterol, apoA-I levels, CE/TC ratio, and converted discoidal to spherical HDL particles.\",\n      \"method\": \"In vitro LCAT activation assay, adenovirus gene transfer in apoA-I-/- mice, electron microscopy, 2D gel HDL subpopulation analysis, rescue with LCAT co-expression\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo complementary assays with genetic rescue and structural verification\",\n      \"pmids\": [\"17506726\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Lipoprotein X (LpX), which accumulates when LCAT is absent, is nephrotoxic and causes all histological hallmarks of familial LCAT deficiency renal disease. An apoA-I- and LCAT-dependent pathway converts LpX to HDL-like particles and mediates normal plasma clearance. LpX is taken up by macropinocytosis into glomerular endothelial cells, podocytes, and mesangial cells, delivered to lysosomes for degradation, induces podocyte secretion of pro-inflammatory IL-6, and causes proteinuria when chronically administered to Lcat-/- mice.\",\n      \"method\": \"Synthetic LpX administration to wild-type and Lcat-/- mice, in vitro LpX-to-HDL conversion assay, EM (TEM/SEM) of kidney, proteinuria measurements, in vitro cytokine assays in podocytes and mesangial cells\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal in vivo and in vitro methods, LpX conversion assay, cellular uptake pathway defined by EM, functional IL-6 readout\",\n      \"pmids\": [\"26919698\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Accumulation of LpX particles (vesicular lipoprotein X) in plasma in the absence of LCAT is strongly associated with spontaneous glomerulopathy. A novel mouse model (SREBP1a transgenic × LCAT-/- ) that selectively accumulates LpX developed glomerular lipid deposits, mesangial expansion, foam cell infiltrates, hyalinosis, and tubulointerstitial lipid deposits by 6–10 months, histologically similar to human LCAT deficiency nephropathy.\",\n      \"method\": \"SREBP1a Tg × lcat-/- mouse model, FPLC plasma lipoprotein fractionation, electron microscopy of LpX, renal histology, immunohistochemistry (RhoA)\",\n      \"journal\": \"The American journal of pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo model with defined genetic background and structural/histological phenotyping, single lab\",\n      \"pmids\": [\"15466392\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Recombinant human LCAT (rhLCAT) enzyme replacement reduces LpX in plasma and kidneys and markedly decreases proteinuria in LCAT-deficient mice expressing abundant LpX, demonstrating that restoring LCAT esterification activity is sufficient to prevent LpX accumulation and renal injury.\",\n      \"method\": \"Intravenous rhLCAT injection in PRCL diet-fed SREBP1a Tg × Lcat-/- mice; plasma lipoprotein profiling; transmission EM; urine albumin/creatinine ratio measurement\",\n      \"journal\": \"The Journal of pharmacology and experimental therapeutics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo rescue experiment with defined mechanistic readouts, single lab\",\n      \"pmids\": [\"30563940\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"LCAT-dependent conversion of prebeta1-HDL to alpha-migrating HDL is the primary mechanism by which prebeta1-HDL is catabolized in plasma, as demonstrated by: (1) time-course incubation at 37°C showing LCAT-inhibitor-sensitive decrease in prebeta1-HDL, and (2) a positive correlation between LCAT activity and the rate of prebeta1-HDL decrease (r = 0.617, P<0.001) in hemodialysis patients vs. controls.\",\n      \"method\": \"Ex vivo plasma incubation at 37°C with and without LCAT inhibitor, prebeta1-HDL quantification by immunoassay, correlation analysis\",\n      \"journal\": \"Journal of the American Society of Nephrology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological inhibitor-controlled ex vivo assay demonstrating LCAT dependence, replicated across patient and control groups\",\n      \"pmids\": [\"12595510\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"LCAT is the only source of plasma long-chain polyunsaturated cholesteryl esters (20:4, 20:5n-3, 22:6n-3) in mouse plasma, demonstrating that LCAT generates a distinct subset of plasma cholesteryl ester species. Removal of functional LCAT from LDLr-/- mice caused a 7-fold increase in the saturated/polyunsaturated CE ratio in LDL due to complete absence of long-chain polyunsaturated CE.\",\n      \"method\": \"LCAT-/- × LDLr-/- and LCAT-/- × apoE-/- double-knockout mice; plasma cholesteryl ester fatty acid composition analysis\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic ablation in two independent mouse backgrounds with detailed fatty acid compositional analysis\",\n      \"pmids\": [\"11893779\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Decreased LCAT reactivity (not decreased LCAT protein or mRNA) with sphingomyelin-enriched HDL particles accounts for the functional LCAT deficiency observed in hA-ITg SR-BI-/- mice. HDL from these mice was enriched in sphingomyelin relative to phosphatidylcholine and had less associated LCAT radiolabel and endogenous LCAT activity, whereas LCAT protein, hepatic mRNA, and in vivo turnover were similar to controls.\",\n      \"method\": \"Radiolabeled LCAT turnover studies (35S), LCAT mass measurement, hepatic mRNA quantification, HDL lipid composition analysis, in vitro LCAT activity assays on isolated HDL fractions\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods distinguishing enzyme mass/turnover from substrate reactivity, single lab\",\n      \"pmids\": [\"17272829\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"LCAT is secreted predominantly in medium and small HDL (alpha2, alpha3, prebeta) fractions, and unlike PLTP and CETP, shows markedly delayed appearance on HDL after secretion, indicating that LCAT resides for a time outside systemic circulation before associating with HDL in plasma. Compartmental modeling of in vivo deuterium-labeled tracer data revealed these distinct metabolic properties.\",\n      \"method\": \"In vivo isotope tracer study with Orbitrap Fusion Lumos MS, compartmental modeling of protein kinetics on multiple HDL sizes from 6 participants\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo tracer with compartmental modeling in human subjects, novel mechanistic insight, single study\",\n      \"pmids\": [\"33351780\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"IL-6 induces LCAT transcription via a minimal response element at −1514 to −1508 bp in the distal LCAT promoter with high homology to a STAT3 binding site. Overexpression of STAT3 significantly enhanced IL-6-induced LCAT promoter activity. Sequential deletion constructs mapped this element as sufficient for IL-6 responsiveness in transfected HepG2 cells.\",\n      \"method\": \"LCAT promoter-reporter deletion constructs, transfection in HepG2 cells, IL-6 treatment, STAT3 overexpression\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter deletion mapping with functional rescue by STAT3 overexpression, single lab\",\n      \"pmids\": [\"12032172\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Increased LCAT cholesterol esterification activity in Scarb1-/- × LCAT-transgenic mice reduced plasma free cholesterol/total cholesterol ratio to normal, decreased VLDL-cholesterol levels, and produced a 51% reduction in aortic sinus atherosclerosis compared to Scarb1-/- mice, demonstrating an antiatherogenic role for LCAT-mediated cholesterol esterification independent of SR-BI.\",\n      \"method\": \"Genetic mouse models (Scarb1-/- × LCAT-null and Scarb1-/- × LCAT-Tg), high-fat diet challenge, aortic sinus lesion quantification, plasma lipoprotein profiling, in vitro cholesterol efflux assay\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean genetic model with dose-response (null vs Tg) and defined atherosclerosis quantification, single lab\",\n      \"pmids\": [\"25964513\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"A novel apoA-I mutation S36A, identified in a hypoalphalipoproteinemic patient, reduces apoA-I self-association (shifts from oligomeric to primarily monomeric form) and significantly impairs LCAT activation while preserving phospholipid vesicle solubilization and lipoprotein surface binding capacity, implicating the N-terminal region around S36 in apoA-I–LCAT interaction.\",\n      \"method\": \"Recombinant protein production, guanidine denaturation, native PAGE, chemical cross-linking, sedimentation equilibrium, phospholipid vesicle solubilization assay, in vitro LCAT activation assay\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple biophysical and biochemical methods on recombinant protein with direct LCAT activity readout, single lab\",\n      \"pmids\": [\"20884842\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"LCAT concentration and activity decrease significantly during STEMI (acute myocardial infarction), and this decrease correlates with impaired HDL-mediated endothelial NO production. In vitro addition of recombinant human LCAT to STEMI patient plasma restores HDL ability to promote endothelial NO production, associated with significant modification of HDL phospholipid classes.\",\n      \"method\": \"Prospective clinical measurement of LCAT mass and activity, in vitro rhLCAT supplementation of patient plasma, NO production assay in cultured endothelial cells, HDL phospholipid composition analysis\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological rescue experiment (rhLCAT addition) with mechanistic readout (NO production), correlation with clinical LCAT levels, single lab\",\n      \"pmids\": [\"30894011\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1985,\n      \"finding\": \"LCAT activity drives the in vitro conversion of HDL3 to lower-density HDL2a in whole plasma. Removal of VLDL/LDL by precipitation shifted the conversion toward higher-density particles, and adding back triglyceride-rich lipoproteins (TGRLP) at ratios ≥2.5:1 caused nearly complete conversion of HDL3 to HDL2b in an LCAT-dependent manner.\",\n      \"method\": \"In vitro incubation of whole plasma with and without active LCAT; selective lipoprotein precipitation; addition of TGRLP or Intralipid; analytical ultracentrifugation\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with enzymatic inhibition controls and multiple substrate conditions\",\n      \"pmids\": [\"3989387\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"In vitro glycation of HDL (the LCAT substrate) alters LCAT kinetics: moderate glycation increases both Km and Vmax but decreases overall enzyme reactivity (Vmax/Km); high glycation reduces both Km and Vmax markedly, further decreasing reactivity. The decrease is attributed to glycation of lysine residues in apoA-I rather than altered lipid or protein composition of HDL.\",\n      \"method\": \"In vitro HDL glycation with glucose/sodium cyanoborohydride, TNBS assay for glycation extent, kinetic analysis (Km, Vmax) of purified LCAT on glycated vs. native HDL\",\n      \"journal\": \"Clinica chimica acta\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single in vitro kinetic study, mechanism attributed by inference without direct mutagenesis of apoA-I lysine residues\",\n      \"pmids\": [\"7758222\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DS-8190a, a small-molecule LCAT activator, directly binds human LCAT protein (confirmed by affinity purification with immobilized DS-8190a beads and thermal shift assay) and activates human and cynomolgus monkey but not mouse LCAT in vitro. In vivo oral dosing in cynomolgus monkeys increased LCAT activity ~2-fold. In Ldlr-KO × hLcat-Tg mice, DS-8190a reduced atherosclerotic lesion area by 48% and enhanced reverse cholesterol transport.\",\n      \"method\": \"In vitro LCAT activation assay, affinity purification with compound-immobilized beads, thermal shift assay, photoaffinity labeling for binding site, oral dosing in cynomolgus monkeys, atherosclerosis lesion quantification, [3H]-cholesterol reverse cholesterol transport assay\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct binding confirmed by two independent biochemical methods (affinity purification and thermal shift), functional activation in vitro and in vivo, single study with multiple orthogonal approaches\",\n      \"pmids\": [\"33086872\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Recombinant human LCAT (rhLCAT) corrects lipoprotein abnormalities in LCAT-deficient human plasma in vitro: reduces unesterified cholesterol by 30%, increases plasma cholesteryl esters by 210%, increases HDL-C by 89%, matures small prebeta-HDL into alpha-migrating particles, and converts abnormal phospholipid-rich LDL-region particles to normally sized LDL.\",\n      \"method\": \"In vitro incubation of LCAT-deficient plasma with rhLCAT; lipoprotein profiling; HDL subpopulation analysis\",\n      \"journal\": \"Biologicals\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro reconstitution demonstrating functional rescue, single lab, no mechanistic dissection\",\n      \"pmids\": [\"24140107\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Estrogen upregulates LCAT expression in liver in an ESR1-dependent manner. LCAT facilitates HDL-C production and uptake via LDLR and SCARB1 pathways. Enhanced HDL-C absorption induced by LCAT impairs SREBP2 maturation, suppressing cholesterol biosynthesis and dampening HCC cell proliferation. SREBF2 overexpression abolished LCAT's inhibitory activity on HCC cells.\",\n      \"method\": \"Transcriptomic analysis of mouse and human liver cancer, in vitro LCAT overexpression/knockdown in HCC cells, in vivo xenograft and orthotopic mouse models, LCAT-KO female mice with ovariectomy, HDL-C treatment, SREBP2 Western blot\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple in vitro and in vivo models with epistasis (SREBF2 overexpression rescue) defining pathway position, single lab\",\n      \"pmids\": [\"38718297\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"LCAT deficiency reduces the LPS-neutralizing capacity of HDL and enhances LPS-induced inflammation in mice. Lcat-/- HDL lacks significant amounts of apoA-I and apoA-II and is primarily composed of apoE. Reintroducing LCAT expression via adenovirus-mediated gene transfer reverted the enhanced inflammatory phenotype to wild-type. Lcat-/- mice also show increased circulating Cd11b+Ly6Cmed monocyte numbers.\",\n      \"method\": \"LPS challenge in Lcat-/- mice, ex vivo whole blood LPS stimulation, in vitro RAW264.7 macrophage TNFα assay with Lcat-/- serum/HDL/lipoprotein fractions, adenoviral LCAT rescue, flow cytometric immunophenotyping\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO phenotype with genetic rescue and in vitro fraction dissection, single lab\",\n      \"pmids\": [\"26170061\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"HDL-cholesteryl ester deficiency in LCAT KO mice (complete absence of HDL-CE due to LCAT absence) results in a 40–50% lower glucocorticoid response to ACTH stimulation, endotoxemia, or fasting, despite normal basal corticosterone. Adrenal cells show compensatory upregulation of HMG-CoA reductase (516%) and LDL receptor (385%), indicating that HDL-derived CE is a major cholesterol source for adrenal steroidogenesis.\",\n      \"method\": \"LCAT KO mouse model, ACTH stimulation, endotoxemia, and fasting protocols; corticosterone measurement; quantitative gene expression of cholesterol metabolism genes; neutral lipid staining of adrenal tissue\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean genetic model with multiple physiological challenges and compensatory gene expression analysis, single lab\",\n      \"pmids\": [\"23178225\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"An inhibitory anti-LCAT antibody in a patient's serum caused acquired LCAT deficiency with nephrotic syndrome histologically identical to familial LCAT deficiency. A mixing test and co-immunoprecipitation confirmed the presence of the antibody and its inhibitory effect. LCAT was detected by immunohistochemistry along glomerular capillary walls, indicating LCAT as a glomerular antigen. Steroid treatment restored LCAT activity and resolved the renal and lipid phenotype.\",\n      \"method\": \"Mixing test for LCAT inhibitory antibody, co-immunoprecipitation, renal biopsy histology/EM, LCAT immunohistochemistry/immunofluorescence, treatment with steroids\",\n      \"journal\": \"Journal of the American Society of Nephrology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single patient case with co-IP and histological evidence, but no mechanistic dissection of the antibody epitope\",\n      \"pmids\": [\"23620397\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"Mutations dispersed throughout the LCAT gene (rather than clustered at the presumed active site) cause loss of enzymatic activity, suggesting multiple structurally important domains. In homozygous deficiency patients with missense mutations, residual LCAT mass was detectable but functionally inactive; null mutations (nonsense, frameshift) eliminated both mass and activity.\",\n      \"method\": \"DNA sequencing of all LCAT exons, mutagenic primer-based restriction analysis, LCAT activity and mass measurement in patients and family heterozygotes\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — genetic analysis without in vitro functional characterization of specific mutants; mechanistic inference from genotype–phenotype correlation\",\n      \"pmids\": [\"8432868\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ApoA-I in mouse cerebrospinal fluid originates from liver and intestine via plasma spherical HDL, which is regulated by ABCA1 and LCAT. Knockout of apoA-I in both intestine and liver virtually eliminated CSF apoA-I, and CSF apoA-I levels correlated with plasma spherical HDL levels regulated by ABCA1 and LCAT.\",\n      \"method\": \"Tissue-specific Apoa1 knockout mice (intestine-specific, liver-specific, double-KO); immunoassay for apoA-I in plasma and CSF; plasma HDL profiling\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — LCAT's role inferred from correlation of CSF apoA-I with LCAT-regulated spherical HDL, not directly tested by LCAT manipulation\",\n      \"pmids\": [\"33020907\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"LCAT is a plasma α/β hydrolase that uses a Ser/Asp345/His377 catalytic triad (with Phe103/Leu182 forming the oxyanion hole and a lid domain at residues 50–74 mediating substrate access, as resolved in the 2.65 Å crystal structure) to transfer the sn-2 acyl chain from phosphatidylcholine to cholesterol, generating cholesteryl esters; on HDL this reaction is activated by apoA-I acting through a specific helical registry (5/5 thumbwheel) involving helices 5–7 and 3–4, with negatively charged residues in helix 6 attenuating reactivity, while apoE is the dominant activator on apoB-containing lipoproteins; LCAT converts discoidal prebeta-HDL into mature spherical alpha-HDL and is essential—together with ABCA1—for HDL biogenesis, the products of which supply cholesterol for adrenal steroidogenesis, brain CSF transport, and LPS neutralization; when LCAT is absent, the nephrotoxic lipoprotein X (LpX) accumulates, is taken up by glomerular cells via macropinocytosis, triggers IL-6 secretion, and causes renal disease; plasma LCAT is cleared via an alpha2-macroglobulin complex recognized by the LRP receptor; and LCAT transcription is upregulated by IL-6 through a STAT3-binding element in its distal promoter and by estrogen through ESR1, the latter suppressing hepatocellular carcinoma by reducing SREBP2-driven cholesterol biosynthesis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"LCAT is a plasma α/β-hydrolase that esterifies cholesterol on lipoproteins and is the central enzyme driving maturation of high-density lipoprotein (HDL) [#0, #2]. Catalysis proceeds through a Ser/Asp345/His377 triad with Phe103 and Leu182 forming the oxyanion hole and a lid domain (residues 50–74) controlling substrate access, an architecture confirmed by the 2.65 Å crystal structure that resolves a hydrolase core plus subdomains for interfacial activation and substrate-pocket shaping [#0, #1]. The enzyme transfers an acyl chain from phosphatidylcholine to cholesterol; on HDL this requires apoA-I as an activator, acting through a defined helical registry—the active 5/5 thumbwheel configuration engaging helices 5–7 and 3–4, with negatively charged helix-6 residues attenuating activity—whereas apoA-II-bound particles are not substrates and apoE is the dominant activator on apoB-containing lipoproteins [#3, #5, #7, #8]. Through this reaction LCAT, together with ABCA1, converts discoidal prebeta-HDL into mature spherical α-HDL and generates the bulk of plasma cholesteryl esters including the long-chain polyunsaturated species [#9, #10, #16, #17]. Loss of LCAT in mice abolishes cholesterol esterification, collapses HDL cholesterol and apoA-I, and causes accumulation of the nephrotoxic vesicular lipoprotein X (LpX), which is taken up by glomerular cells via macropinocytosis, drives IL-6 secretion, and produces renal disease resembling familial LCAT deficiency; recombinant LCAT replacement reverses LpX accumulation and proteinuria [#2, #13, #14, #15]. LCAT-derived cholesteryl ester additionally supplies cholesterol for adrenal steroidogenesis, supports HDL antiatherogenic and LPS-neutralizing functions, and its expression is regulated by IL-6 through a STAT3 element in the distal promoter and by estrogen via ESR1, the latter suppressing hepatocellular carcinoma by limiting SREBP2-driven cholesterol synthesis [#20, #21, #28, #29, #30]. Plasma LCAT is cleared as an enzymatically inactive complex with α2-macroglobulin recognized by the LRP receptor [#4].\",\n  \"teleology\": [\n    {\n      \"year\": 1993,\n      \"claim\": \"Establishing whether LCAT loss-of-function arose from active-site lesions alone defined whether the protein had multiple functionally critical domains.\",\n      \"evidence\": \"Sequencing of all LCAT exons and mass/activity measurement in deficiency patients and heterozygotes\",\n      \"pmids\": [\"8432868\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No in vitro functional characterization of individual mutants\", \"Mechanism inferred from genotype–phenotype correlation only\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Defining which apolipoproteins generate competent LCAT substrate particles established apolipoprotein specificity in HDL maturation.\",\n      \"evidence\": \"Cell-derived nascent apoA-I vs apoA-II lipid complexes incubated with purified LCAT, EM and native PAGE\",\n      \"pmids\": [\"7706940\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve the apoA-I structural features required for activation\", \"In vitro reconstitution only\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"A clean knockout determined the in vivo necessity of LCAT for plasma cholesterol esterification and HDL homeostasis.\",\n      \"evidence\": \"Mouse LCAT gene disruption with FPLC and 2D-gel lipoprotein phenotyping under dietary challenge\",\n      \"pmids\": [\"9054454\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address downstream pathophysiology such as renal or steroidogenic consequences\", \"Mouse-only physiology\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Identifying the catalytic triad and oxyanion hole placed LCAT mechanistically within the α/β-hydrolase fold and defined its active site.\",\n      \"evidence\": \"Homology modeling plus site-directed mutagenesis expressed in Cos-1 cells with activity assays\",\n      \"pmids\": [\"9541390\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Lid domain role proposed but not structurally resolved\", \"No experimental 3D structure at this stage\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Discovering the LCAT–α2-macroglobulin complex defined the receptor-mediated route for plasma LCAT clearance.\",\n      \"evidence\": \"Complex purification, radiolabeled binding assays, and internalization/degradation in LRP(+/+) vs LRP(−/−) cells\",\n      \"pmids\": [\"11435418\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological regulation of this clearance pathway not quantified\", \"Binding interface on LCAT not mapped\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Comparing apoE and apoA-I activation across genetic substrate backgrounds established apoE as the dominant activator on apoB-containing lipoproteins.\",\n      \"evidence\": \"apoA-I/apoE KO mouse plasma, in vitro LCAT assays on genotype-defined LDL/VLDL, apolipoprotein reconstitution\",\n      \"pmids\": [\"15654758\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of apoE-driven activation not defined\", \"Did not address relative contribution in human lipoproteins\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Genetic epistasis fixed LCAT's position downstream of ABCA1 in converting discoidal to spherical HDL across multiple apolipoprotein scaffolds.\",\n      \"evidence\": \"Adenoviral apoE4/apoA-IV plus LCAT transfer in ABCA1−/−, LCAT−/−, apoA-I−/− mice with EM verification\",\n      \"pmids\": [\"17206937\", \"23132909\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not dissect the molecular interface of LCAT with each apolipoprotein\", \"Particle remodeling kinetics not resolved\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Mapping disease and engineered apoA-I mutations that block LCAT activation showed impaired activation is the primary defect causing discoidal HDL accumulation.\",\n      \"evidence\": \"In vitro activation assays plus adenoviral mutant expression and LCAT rescue in apoA-I−/− mice with 2D-gel and EM readouts\",\n      \"pmids\": [\"17711302\", \"17506726\", \"10787436\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not produce a co-structure of LCAT with apoA-I\", \"Residue-level interaction inferred from activity, not direct binding\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Disulfide-locking apoA-I registries demonstrated that activation depends on a specific helical configuration (5/5 thumbwheel) rather than on LCAT binding alone.\",\n      \"evidence\": \"Engineered disulfide-locked rHDL, esterification assays, and chemical cross-linking\",\n      \"pmids\": [\"29773713\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The hybrid epitope model not confirmed by direct structure\", \"Dynamics of the thumbwheel during catalysis unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"The crystal structure provided a definitive framework linking catalytic and interfacial-activation subdomains to disease mutations.\",\n      \"evidence\": \"X-ray crystallography at 2.65 Å with deglycosylation and Fab-complex crystallization\",\n      \"pmids\": [\"26195816\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure lacks bound lipoprotein substrate\", \"Lid conformational change during activation not captured\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defining LpX as the nephrotoxic species and its uptake route explained the renal pathology of LCAT deficiency at the cellular level.\",\n      \"evidence\": \"Synthetic LpX administration to WT and Lcat−/− mice, EM of kidney, IL-6 cytokine assays in glomerular cells\",\n      \"pmids\": [\"26919698\", \"15466392\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Receptor/macropinocytosis trigger on glomerular cells not molecularly identified\", \"Link between IL-6 and proteinuria not fully causal\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Enzyme-replacement experiments established that restoring esterification activity is sufficient to prevent LpX-driven renal injury.\",\n      \"evidence\": \"Intravenous rhLCAT in SREBP1a Tg × Lcat−/− mice with EM and albumin/creatinine readouts\",\n      \"pmids\": [\"30563940\", \"24140107\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab in vivo rescue\", \"Durability and dosing in human disease not established\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Connecting estrogen/ESR1 regulation of LCAT to SREBP2-dependent cholesterol synthesis revealed a transcriptional and tumor-suppressive axis beyond lipoprotein metabolism.\",\n      \"evidence\": \"LCAT overexpression/knockdown in HCC cells, xenograft/orthotopic models, ovariectomized LCAT-KO mice, SREBF2 rescue\",\n      \"pmids\": [\"38718297\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct ESR1 binding at the LCAT locus not demonstrated\", \"Generality across cancer contexts unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How LCAT physically docks onto its lipoprotein substrate during interfacial activation, and the structural transitions of the lid coupled to apoA-I registry, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No co-structure of LCAT with HDL or apoA-I\", \"Conformational coupling between lid opening and catalysis not visualized\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 5, 6, 17]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0, 1, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [2, 4, 19]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [2, 9, 17, 21]},\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [9, 16, 24]}\n    ],\n    \"complexes\": [\n      \"LCAT–alpha2-macroglobulin complex\",\n      \"HDL\"\n    ],\n    \"partners\": [\n      \"APOA1\",\n      \"APOE\",\n      \"APOA4\",\n      \"A2M\",\n      \"LRP1\",\n      \"STAT3\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}