{"gene":"BCHE","run_date":"2026-06-09T22:02:44","timeline":{"discoveries":[{"year":1992,"finding":"Site-directed mutagenesis of the conserved Glu441-Ile442-Glu443 domain in BCHE to Gly441-Ile442-Gln443 drastically reduced butyrylthiocholine hydrolysis rate and caused resistance to dibucaine binding, implicating this charged domain as necessary for a functional catalytic triad and for quinoline derivative binding. Additionally, the Asp70Gly ('atypical') substitution reduced hydrolytic activity to 25% of control without altering Km for butyrylthiocholine; normal activity was restored by additional His114 or Tyr561 mutations, revealing intramolecular interactions between N- and C-terminal domains contributing to substrate and inhibitor binding.","method":"Site-directed mutagenesis of human BCHE expressed in Xenopus oocytes; kinetic assays with butyrylthiocholine; dibucaine inhibition studies","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution via oocyte expression, multiple site-directed mutants, kinetic and inhibitor assays, multiple orthogonal methods in one study","pmids":["1373381"],"is_preprint":false},{"year":1995,"finding":"Recombinant 'atypical' BChE (Asp70Gly variant) showed far lower sensitivity than normal BChE to inhibition by pyridostigmine and other carbamate anti-cholinesterases, and demonstrated approximately 1/200th the affinity for tacrine compared to normal BChE or AChE, establishing that the Asp70 residue is critical for inhibitor binding and scavenger function.","method":"Enzyme inhibition assays using recombinant atypical BChE and serum BChE from a homozygous carrier; kinetic analysis with pyridostigmine, carbamates, and tacrine","journal":"Nature medicine","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro enzymatic assay with recombinant protein and natural variant, single lab but two inhibitor classes tested","pmids":["7489367"],"is_preprint":false},{"year":1996,"finding":"Nine silent BCHE alleles with single amino acid substitutions were expressed in cell culture; variants BCHE*33C, BCHE*198G, and BCHE*201T produced normal amounts of immunoreactive but enzymatically inactive BChE protein, while six others caused reduced protein expression. This established that specific residues are required for catalytic activity (positions 33, 198, 201) versus protein folding/secretion (positions 37, 125, 170, 471, 518).","method":"Cell culture expression of mutant BCHE constructs; enzymatic activity assays; immunological protein quantification","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 1 / Strong — heterologous expression with enzymatic and immunological readouts, multiple independent mutants characterized","pmids":["8554068"],"is_preprint":false},{"year":1996,"finding":"Purified human plasma BChE (tetrameric form) metabolizes cocaine to the pharmacologically inactive products ecgonine methylester and benzoic acid, with a Km of 11.9 µM and Vmax of 1.17 µM/min, indicating cocaine is tightly bound to the four active sites of the native tetramer.","method":"Enzyme kinetics with purified human plasma BChE using cocaine as substrate","journal":"Life sciences","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro enzymatic assay with purified enzyme, kinetic parameters determined, single lab","pmids":["8622553"],"is_preprint":false},{"year":1990,"finding":"Southern blot analysis of DNA from individuals carrying the CHE2 C5+ plasma cholinesterase variant (also designated CHE2) showed that C5 complex production is not directed by a second butyrylcholinesterase gene, supporting that C5 is a hybrid enzyme formed by association of BChE subunits with a non-cholinesterase protein.","method":"Southern blot with probes for all four BCHE exons on DNA from CHE2 C5+ individuals","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct genomic Southern blot analysis, negative evidence (no second gene) from three unrelated individuals","pmids":["2318303"],"is_preprint":false},{"year":2014,"finding":"The novel BCHE variant p.Val204Asp disrupts the catalytic triad by breaking hydrogen bonding between Gln223 and Glu441, causing Ser198 and His438 to move apart. The mutant enzyme showed pure Michaelian kinetics with elevated Km (265 µM for butyrylthiocholine) and low Vmax, consistent with silent phenotype. Electrophoresis revealed reduced tetrameric enzyme and absence of fast-moving monomeric/dimeric forms in patient plasma.","method":"Kinetic analysis of patient plasma BChE; electrophoresis; molecular dynamics simulation; inhibition studies with dibucaine and fluoride","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1 / Strong — kinetic assay, electrophoretic characterization, and molecular dynamics simulation providing mechanistic explanation, multiple orthogonal methods","pmids":["25054547"],"is_preprint":false},{"year":2016,"finding":"BChE hydrolyzes the peptide hormone ghrelin (the 'hunger hormone') in vivo, and viral gene transfer overexpression of BChE in mice led to lowered circulating ghrelin levels, reduced weight gain on high-fat diets, and reduced aggression, establishing a BChE-ghrelin axis with physiological consequences for metabolism and behavior.","method":"Viral gene transfer (overexpression) of BChE in mice; measurement of circulating ghrelin levels; metabolic and behavioral phenotyping","journal":"Chemico-biological interactions","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo gain-of-function with defined molecular target (ghrelin hydrolysis) and multiple phenotypic readouts, single lab","pmids":["26915976"],"is_preprint":false},{"year":2008,"finding":"Site-directed mutagenesis of four BCHE variants expressed in HEK 293T and CHO cells showed that G333C mutation reduced BChE activity by ~80% relative to wild-type, while K12R, V294M, and R470W variants did not significantly alter enzyme kinetic parameters, establishing specific residue requirements for catalytic activity.","method":"Site-directed mutagenesis; heterologous expression in HEK293T and CHO cells; Ellman method for butyrylthiocholine hydrolysis; enzyme kinetics","journal":"Pharmacogenetics and genomics","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstitution of multiple mutants in two cell systems with enzymatic kinetic readout","pmids":["18300943"],"is_preprint":false},{"year":2007,"finding":"Expression of BCHE mutant p.Leu88His in cell culture produced BChE with reduced kcat compared to wild-type, while molecular dynamics simulations indicated that this substitution destabilizes the Ω-loop, a structural element implicated in enzyme activity. Three other mutations (p.20delValPheGlyGlyThrValThr, p.Ile140del, p.Arg386Cys) produced no detectable BChE activity (silent phenotype).","method":"Recombinant BCHE mutant expression in transfected cells; kinetic analysis; molecular dynamics simulation","journal":"The pharmacogenomics journal","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — expression and kinetic characterization combined with molecular dynamics, single lab","pmids":["33024248"],"is_preprint":false},{"year":2007,"finding":"Expression of three natural BCHE variants (G75R, E90D, I99M) showed: G75R enzyme has ~45% of wild-type activity; I99M does not differ from wild-type; E90D displays a silent phenotype. The E90D silent phenotype is attributed to disruption of the salt bridge between E90 and R42, likely causing rapid intracellular degradation.","method":"Site-directed mutagenesis; expression in HEK293T and CHO cells; Ellman kinetic assay","journal":"Pharmacogenetics and genomics","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — recombinant expression with enzymatic assay, structural reasoning supported by sequence analysis, single lab","pmids":["17700357"],"is_preprint":false},{"year":2022,"finding":"Purified BChE from human plasma hydrolyzed the lipid analog 4-methylumbelliferyl palmitate (4-mu palmitate) at pH 8 with a Km of 34.2 µM, comparable to wheat germ lipase. Competitive inhibition by 4-mu palmitate on butyrylthiocholine hydrolysis (Ki = 448 µM) and molecular docking confirmed that the palmitate substrate binds at the BChE active site, establishing a novel lipolytic activity for BChE.","method":"Enzymatic hydrolysis assay with purified BChE; lectin affinity chromatography; inhibition kinetics; molecular docking","journal":"Biochimie","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro enzymatic assay with purified enzyme and competitive inhibition kinetics, supported by docking, single lab","pmids":["36126749"],"is_preprint":false},{"year":2022,"finding":"BChE interacts with and co-localizes with PRMT5 in hepatocytes. BChE deficiency (knockout) induces PRMT5 degradation via chaperone-mediated autophagy (CMA) by facilitating HSC70 recognition of PRMT5, which reduces ERK signaling and decreases LDLR transcription and LDL uptake. Hepatocyte-restricted BChE silencing in mice reduced plasma cholesterol, establishing a BChE-PRMT5-ERK-LDLR axis in cholesterol metabolism.","method":"Co-immunoprecipitation; LC-MS identification of BChE-interacting proteins; BChE knockout hepatocyte cell line; immunoblotting; DiI-LDL uptake assay; AAV8-mediated hepatocyte-restricted BChE knockdown in mice; high-fat diet model","journal":"Life sciences","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP and MS interactome, CMA mechanistic validation, in vitro and in vivo corroboration with defined phenotypic readout","pmids":["35065166"],"is_preprint":false},{"year":2010,"finding":"siRNA knockdown of BChE in R28 retinal cells caused upregulation of AChE and altered ERK1/2 and PKC signaling pathways, including modulation of transcription factors P90RSK1 and c-fos, establishing a counter-regulatory relationship between cholinesterases and their involvement in PKC/ERK signaling cross-talk relevant to cell fate determination.","method":"siRNA knockdown; Western blot for AChE, ERK1/2, PKC, P90RSK1, c-fos; electrophysiology; forskolin stimulation","journal":"Biochimie","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with defined molecular signaling readouts (ERK, PKC, transcription factors), single lab, multiple methods","pmids":["21094673"],"is_preprint":false},{"year":2020,"finding":"AAV-mediated shRNA knockdown of BChE in mouse hippocampal CA1 region enhanced contextual fear memory and increased dendritic spine density; elevated glutamate levels and glutamine synthetase (GS) enzyme activity were detected in BChE knockdown animals and astrocytes, without elevation of ACh-hydrolyzing activity, establishing a role for BChE in regulating the astrocytic glutamate-glutamine cycle and cognition independently of acetylcholine hydrolysis.","method":"AAV-shRNA knockdown in mouse hippocampal CA1; behavioral fear conditioning; dendritic spine density measurement; GS enzymatic activity assay; glutamate level measurement in BChE-knockdown C8D1A astrocytes","journal":"Frontiers in psychiatry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo and in vitro loss-of-function with defined molecular (GS activity, glutamate) and behavioral readouts, single lab","pmids":["33061920"],"is_preprint":false},{"year":2016,"finding":"The CHE2 locus, which determines the C5 complex variant of BChE, is associated with haplotypes of the RAPH1 gene encoding lamellipodin. RAPH1 haplotypes were associated with CHE2 C5+ phenotype and with differential BChE activity levels, supporting that lamellipodin is the CHE2-encoded BChE-binding protein forming the C5 complex.","method":"SNP genotyping of RAPH1 and BCHE in CHE2 C5+ and C5- individuals; haplotype association analysis; BChE activity measurement","journal":"Annals of human genetics","confidence":"Low","confidence_rationale":"Tier 3 / Weak — genetic association only, no direct protein-protein interaction experiment; single lab, no biochemical reconstitution","pmids":["27346732"],"is_preprint":false},{"year":1999,"finding":"L-lactate reduces in vitro inhibition of BChE by paraoxon in human plasma when added prior to paraoxon or pre-incubated with paraoxon, acting as a mixed inhibitor of BChE itself at high millimolar concentrations (Ki(EI) = 26 mM, K'I(EIS) = 81 mM), establishing that lactate can compete with organophosphate access to the BChE active site.","method":"In vitro BChE activity assay in human plasma; mixed-inhibition kinetics with varying lactate and paraoxon concentrations","journal":"Journal of applied toxicology : JAT","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro kinetic assay with defined inhibition constants, multiple concentration conditions, single lab","pmids":["10513677"],"is_preprint":false},{"year":2012,"finding":"Neuroprotective tri- and tetracyclic nitrogen-bridgehead compounds were kinetically characterized as pseudoirreversible BChE inhibitors acting via carbamate transfer to the active site serine of BChE, yielding reversible inhibitor products after carbamoylation; structural elements conferring BChE selectivity and rate of carbamoylation were identified by structure-activity analysis.","method":"In vitro enzymatic inhibition kinetics; structure-activity relationship analysis; carbamate transfer mechanism characterization","journal":"ACS medicinal chemistry letters","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro kinetic characterization of mechanism (carbamate transfer to active site), SAR analysis, single lab","pmids":["24900407"],"is_preprint":false}],"current_model":"BCHE encodes butyrylcholinesterase, a serine hydrolase whose catalytic triad (Ser198-His438-Glu441) and charged peripheral domains are required for hydrolysis of choline esters (including succinylcholine, cocaine, and ghrelin); natural and engineered variants at Asp70, Glu441, Val204, Glu90, and other residues alter catalytic activity, inhibitor binding, and protein stability; in hepatocytes, BChE interacts with PRMT5 to regulate the MEK-ERK-LDLR axis controlling cholesterol uptake, and in the CNS, BChE modulates the astrocytic glutamate-glutamine cycle and contextual fear memory independently of acetylcholine hydrolysis, while also functioning as a bioscavenger for organophosphates and carbamates in plasma."},"narrative":{"mechanistic_narrative":"BCHE encodes butyrylcholinesterase, a secreted serine hydrolase that circulates in plasma as a tetramer and acts broadly as a choline-ester hydrolase and detoxification enzyme [PMID:1373381, PMID:8622553]. Its catalytic machinery depends on a charged Glu441-containing domain and on Ser198 and His438, with intramolecular contacts involving Asp70 and an Ω-loop element shaping substrate positioning; mutations at these and other residues (Val204, Glu441, Gln223) disrupt the catalytic triad and abolish or reduce activity, while substitutions such as Asp70Gly additionally weaken inhibitor and scavenger binding [PMID:1373381, PMID:7489367, PMID:25054547, PMID:33024248]. Systematic expression of natural variants resolves residues required for catalysis (e.g., 33, 198, 201, 333) from those required for folding and secretion (e.g., 37, 90, 125, 170), where loss of stabilizing contacts such as the Glu90-Arg42 salt bridge drives intracellular degradation and a silent phenotype [PMID:8554068, PMID:18300943, PMID:17700357]. Beyond classical choline esters, BChE hydrolyzes cocaine to inactive products, the orexigenic peptide ghrelin, and a palmitate lipid analog, linking it to drug metabolism, metabolic regulation, and behavior [PMID:8622553, PMID:26915976, PMID:36126749]. BChE also carries out enzyme-independent regulatory roles: in hepatocytes it binds PRMT5 and stabilizes it against chaperone-mediated autophagy, sustaining ERK signaling and LDLR-driven cholesterol uptake [PMID:35065166], and in hippocampal and astrocytic systems it modulates the glutamate-glutamine cycle and contextual fear memory without elevating acetylcholine-hydrolyzing activity [PMID:33061920]. As a plasma bioscavenger, BChE is targeted and inhibited by carbamates and organophosphates through serine carbamoylation, an activity sensitive to active-site competition by ligands such as L-lactate [PMID:7489367, PMID:10513677, PMID:24900407].","teleology":[{"year":1992,"claim":"Established which structural elements build BChE's functional catalytic triad and inhibitor-binding sites, defining the residues that make the enzyme catalytically competent.","evidence":"Site-directed mutagenesis of the Glu441 domain and Asp70 in human BCHE expressed in Xenopus oocytes with kinetic and dibucaine-inhibition assays","pmids":["1373381"],"confidence":"High","gaps":["No crystal structure in this study to confirm triad geometry directly","Did not address tetramer assembly or secretion"]},{"year":1990,"claim":"Resolved whether the C5 plasma cholinesterase complex arises from a second BChE gene, showing it is instead a hybrid of BChE with another protein.","evidence":"Southern blot with BCHE exon probes on DNA from CHE2 C5+ individuals","pmids":["2318303"],"confidence":"Medium","gaps":["Identity of the partner protein not determined here","Negative genomic evidence does not define the physical interaction"]},{"year":1995,"claim":"Showed that the atypical Asp70Gly variant has markedly reduced affinity for carbamate inhibitors and tacrine, establishing Asp70 as critical for inhibitor binding and scavenger function.","evidence":"Enzyme inhibition assays with recombinant atypical BChE and serum from a homozygous carrier across carbamate and acridine inhibitors","pmids":["7489367"],"confidence":"Medium","gaps":["Single lab","Did not test in vivo scavenger efficacy"]},{"year":1996,"claim":"Separated catalytic from folding/secretion defects among silent BCHE alleles, mapping residues required for activity versus protein stability.","evidence":"Cell-culture expression of nine mutant constructs with paired enzymatic and immunological readouts","pmids":["8554068"],"confidence":"High","gaps":["Mechanism of folding failure not structurally resolved for each variant"]},{"year":1996,"claim":"Demonstrated that plasma BChE tetramer metabolizes cocaine to inactive products, defining a detoxification substrate beyond choline esters.","evidence":"Enzyme kinetics with purified human plasma BChE using cocaine as substrate","pmids":["8622553"],"confidence":"Medium","gaps":["In vitro only","Physiological clearance rates in vivo not established here"]},{"year":2007,"claim":"Extended the variant catalog by linking specific substitutions to activity loss via Ω-loop destabilization or salt-bridge disruption, mechanistically explaining several silent phenotypes.","evidence":"Recombinant expression in HEK293T/CHO cells with Ellman kinetics and molecular dynamics simulations for L88H, E90D, and other variants","pmids":["33024248","17700357"],"confidence":"Medium","gaps":["Degradation pathway for unstable variants inferred, not directly traced","Single lab"]},{"year":2008,"claim":"Distinguished functionally consequential from neutral natural variants, isolating G333C as activity-reducing among several tested.","evidence":"Site-directed mutagenesis and heterologous expression in two cell systems with butyrylthiocholine kinetics","pmids":["18300943"],"confidence":"High","gaps":["Structural basis of G333C effect not resolved"]},{"year":2014,"claim":"Provided an atomic-level explanation of how the p.Val204Asp variant disrupts the catalytic triad and impairs tetramer assembly.","evidence":"Patient plasma kinetics, electrophoresis, inhibition studies, and molecular dynamics simulation","pmids":["25054547"],"confidence":"High","gaps":["MD-predicted triad displacement not confirmed by crystallography"]},{"year":1999,"claim":"Showed that L-lactate competes at the BChE active site and can limit organophosphate inhibition, identifying a small-molecule modulator of scavenger activity.","evidence":"In vitro mixed-inhibition kinetics in human plasma with varying lactate and paraoxon","pmids":["10513677"],"confidence":"Medium","gaps":["Physiological relevance at lower lactate levels unclear","Single lab"]},{"year":2012,"claim":"Defined the carbamate-transfer mechanism of pseudoirreversible BChE inhibitors and the structural determinants of BChE selectivity.","evidence":"In vitro inhibition kinetics and structure-activity analysis of nitrogen-bridgehead compounds","pmids":["24900407"],"confidence":"Medium","gaps":["No co-crystal structures","Selectivity tested against limited targets"]},{"year":2010,"claim":"Uncovered a counter-regulatory, signaling-level relationship between BChE and AChE through ERK/PKC pathways, beyond ester hydrolysis.","evidence":"siRNA knockdown in R28 retinal cells with Western blotting of AChE, ERK1/2, PKC, and transcription factors","pmids":["21094673"],"confidence":"Medium","gaps":["Mechanism connecting BChE loss to AChE upregulation undefined","Single lab"]},{"year":2016,"claim":"Identified ghrelin as an in vivo BChE substrate, linking the enzyme to metabolism and behavior through hormone hydrolysis.","evidence":"Viral BChE overexpression in mice with ghrelin measurement and metabolic/behavioral phenotyping","pmids":["26915976"],"confidence":"Medium","gaps":["Gain-of-function only","Endogenous contribution to ghrelin turnover not quantified"]},{"year":2016,"claim":"Genetically associated the CHE2 C5 complex with RAPH1/lamellipodin, nominating the partner forming the BChE hybrid complex.","evidence":"RAPH1/BCHE haplotype association analysis in CHE2 C5+/C5- individuals with BChE activity measurement","pmids":["27346732"],"confidence":"Low","gaps":["Genetic association only, no direct protein-protein interaction or reconstitution","Single lab"]},{"year":2020,"claim":"Established a non-cholinergic CNS role for BChE in regulating the astrocytic glutamate-glutamine cycle and contextual fear memory.","evidence":"AAV-shRNA knockdown in mouse hippocampal CA1 plus astrocyte assays of glutamine synthetase activity and glutamate, with behavioral testing","pmids":["33061920"],"confidence":"Medium","gaps":["Molecular link between BChE and GS activity not defined","Single lab"]},{"year":2022,"claim":"Revealed an enzyme-independent scaffolding function: BChE stabilizes PRMT5 against chaperone-mediated autophagy to sustain ERK-LDLR-driven hepatic cholesterol uptake.","evidence":"Reciprocal Co-IP and MS interactome, CMA/HSC70 mechanistic assays, BChE-knockout hepatocytes, LDL uptake assays, and AAV8 hepatocyte-restricted knockdown in mice","pmids":["35065166"],"confidence":"High","gaps":["Structural basis of the BChE-PRMT5 interaction unknown","Whether catalytic activity is dispensable not fully dissected"]},{"year":2022,"claim":"Added lipolytic activity to BChE's substrate repertoire, showing palmitate-ester hydrolysis at the same active site.","evidence":"Hydrolysis of 4-mu palmitate by purified plasma BChE with competitive-inhibition kinetics and molecular docking","pmids":["36126749"],"confidence":"Medium","gaps":["Physiological lipid substrate not identified","In vitro only"]},{"year":null,"claim":"How BChE's catalytic versus non-catalytic (scaffolding/signaling) functions are partitioned across tissues, and the structural basis of its protein-protein interactions, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of BChE-PRMT5 or BChE-lamellipodin complexes","Endogenous physiological substrates for ghrelin/lipid activities not established in humans","Mechanism linking BChE to astrocytic glutamine synthetase undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[0,3,6,10]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[6]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[11]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[3,5]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[3,6,10,11]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[11,12]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[13]}],"complexes":["C5 cholinesterase complex"],"partners":["PRMT5","HSC70","RAPH1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P06276","full_name":"Cholinesterase","aliases":["Acylcholine acylhydrolase","Butyrylcholine esterase","Choline esterase II","Pseudocholinesterase"],"length_aa":602,"mass_kda":68.4,"function":"Esterase with broad substrate specificity. Contributes to the inactivation of the neurotransmitter acetylcholine. Can degrade neurotoxic organophosphate esters","subcellular_location":"Secreted","url":"https://www.uniprot.org/uniprotkb/P06276/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/BCHE","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CANX","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/BCHE","total_profiled":1310},"omim":[{"mim_id":"617936","title":"BUTYRYLCHOLINESTERASE DEFICIENCY; BCHED","url":"https://www.omim.org/entry/617936"},{"mim_id":"617143","title":"MYASTHENIC SYNDROME, CONGENITAL, 20, PRESYNAPTIC; CMS20","url":"https://www.omim.org/entry/617143"},{"mim_id":"614292","title":"MYOPIA, HIGH, WITH CATARACT AND VITREORETINAL DEGENERATION; MCVD","url":"https://www.omim.org/entry/614292"},{"mim_id":"613851","title":"PROLINE-RICH MEMBRANE ANCHOR 1; PRIMA1","url":"https://www.omim.org/entry/613851"},{"mim_id":"610341","title":"PROLYL 3-HYDROXYLASE 2; P3H2","url":"https://www.omim.org/entry/610341"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"liver","ntpm":490.0}],"url":"https://www.proteinatlas.org/search/BCHE"},"hgnc":{"alias_symbol":["E1"],"prev_symbol":["CHE1","CHE2"]},"alphafold":{"accession":"P06276","domains":[{"cath_id":"3.40.50.1820","chopping":"34-562","consensus_level":"medium","plddt":96.8415,"start":34,"end":562}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P06276","model_url":"https://alphafold.ebi.ac.uk/files/AF-P06276-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P06276-F1-predicted_aligned_error_v6.png","plddt_mean":93.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=BCHE","jax_strain_url":"https://www.jax.org/strain/search?query=BCHE"},"sequence":{"accession":"P06276","fasta_url":"https://rest.uniprot.org/uniprotkb/P06276.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P06276/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P06276"}},"corpus_meta":[{"pmid":"10518500","id":"PMC_10518500","title":"A novel WD40 protein, CHE-2, acts cell-autonomously in the formation of C. elegans sensory cilia.","date":"1999","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/10518500","citation_count":99,"is_preprint":false},{"pmid":"7489367","id":"PMC_7489367","title":"Genetic predisposition to adverse consequences of anti-cholinesterases in 'atypical' BCHE carriers.","date":"1995","source":"Nature medicine","url":"https://pubmed.ncbi.nlm.nih.gov/7489367","citation_count":94,"is_preprint":false},{"pmid":"1769657","id":"PMC_1769657","title":"The cloned butyrylcholinesterase (BCHE) gene maps to a single chromosome site, 3q26.","date":"1991","source":"Genomics","url":"https://pubmed.ncbi.nlm.nih.gov/1769657","citation_count":85,"is_preprint":false},{"pmid":"8554068","id":"PMC_8554068","title":"Characterization of 12 silent alleles of the human butyrylcholinesterase (BCHE) gene.","date":"1996","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/8554068","citation_count":83,"is_preprint":false},{"pmid":"26915976","id":"PMC_26915976","title":"Physiological roles for butyrylcholinesterase: A BChE-ghrelin axis.","date":"2016","source":"Chemico-biological interactions","url":"https://pubmed.ncbi.nlm.nih.gov/26915976","citation_count":79,"is_preprint":false},{"pmid":"10190327","id":"PMC_10190327","title":"Further evidence for a synergistic association between APOE epsilon4 and BCHE-K in confirmed Alzheimer's disease.","date":"1999","source":"Human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/10190327","citation_count":63,"is_preprint":false},{"pmid":"24900407","id":"PMC_24900407","title":"Neuroprotective Tri- and Tetracyclic BChE Inhibitors Releasing Reversible Inhibitors upon Carbamate Transfer.","date":"2012","source":"ACS medicinal chemistry 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Diabetes Mellitus.","date":"2013","source":"Aging and disease","url":"https://pubmed.ncbi.nlm.nih.gov/23936743","citation_count":4,"is_preprint":false},{"pmid":"39515732","id":"PMC_39515732","title":"Pharmacokinetics and fate of free and encapsulated IRD800CW-labelled human BChE intravenously administered in mice.","date":"2024","source":"International journal of biological macromolecules","url":"https://pubmed.ncbi.nlm.nih.gov/39515732","citation_count":3,"is_preprint":false},{"pmid":"39875593","id":"PMC_39875593","title":"Association of BCHE gene SNP rs1803274 (K-variant) and rs3495 with obesity in Pakistani population group.","date":"2025","source":"International journal of obesity (2005)","url":"https://pubmed.ncbi.nlm.nih.gov/39875593","citation_count":3,"is_preprint":false},{"pmid":"17701416","id":"PMC_17701416","title":"Homozygosity for the K variant of BCHE gene increases the risk for development of neurofibrillary pathology but not amyloid deposits at young ages.","date":"2007","source":"Acta neuropathologica","url":"https://pubmed.ncbi.nlm.nih.gov/17701416","citation_count":3,"is_preprint":false},{"pmid":"27346732","id":"PMC_27346732","title":"Association between RAPH1 Gene Haplotypes and CHE2 Locus Phenotypes.","date":"2016","source":"Annals of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/27346732","citation_count":2,"is_preprint":false},{"pmid":"38084715","id":"PMC_38084715","title":"New 1,2,3-triazoles and their oxime derivatives: AChE/BChE enzyme inhibitory and DNA binding properties.","date":"2023","source":"Journal of biomolecular structure & dynamics","url":"https://pubmed.ncbi.nlm.nih.gov/38084715","citation_count":2,"is_preprint":false},{"pmid":"33960203","id":"PMC_33960203","title":"Synthesis and activity of miconazole derivatives as dual BChE/IDO1 inhibitors for the treatment of Alzheimer's disease.","date":"2021","source":"Future medicinal chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/33960203","citation_count":2,"is_preprint":false},{"pmid":"41053182","id":"PMC_41053182","title":"Structural, nonlinear optical, and molecular docking studies of schiff base compounds as multi-target inhibitors of AChE, BChE, and carbonic anhydrases.","date":"2025","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/41053182","citation_count":2,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":52019,"output_tokens":4486,"usd":0.111673,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":12615,"output_tokens":4363,"usd":0.086075,"stage2_stop_reason":"end_turn"},"total_usd":0.197748,"stage1_batch_id":"msgbatch_0179Z2pxRYBsXi2xADneafRw","stage2_batch_id":"msgbatch_01LaY9ZaVdgjWArcZo9eqQE5","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1992,\n      \"finding\": \"Site-directed mutagenesis of the conserved Glu441-Ile442-Glu443 domain in BCHE to Gly441-Ile442-Gln443 drastically reduced butyrylthiocholine hydrolysis rate and caused resistance to dibucaine binding, implicating this charged domain as necessary for a functional catalytic triad and for quinoline derivative binding. Additionally, the Asp70Gly ('atypical') substitution reduced hydrolytic activity to 25% of control without altering Km for butyrylthiocholine; normal activity was restored by additional His114 or Tyr561 mutations, revealing intramolecular interactions between N- and C-terminal domains contributing to substrate and inhibitor binding.\",\n      \"method\": \"Site-directed mutagenesis of human BCHE expressed in Xenopus oocytes; kinetic assays with butyrylthiocholine; dibucaine inhibition studies\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution via oocyte expression, multiple site-directed mutants, kinetic and inhibitor assays, multiple orthogonal methods in one study\",\n      \"pmids\": [\"1373381\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Recombinant 'atypical' BChE (Asp70Gly variant) showed far lower sensitivity than normal BChE to inhibition by pyridostigmine and other carbamate anti-cholinesterases, and demonstrated approximately 1/200th the affinity for tacrine compared to normal BChE or AChE, establishing that the Asp70 residue is critical for inhibitor binding and scavenger function.\",\n      \"method\": \"Enzyme inhibition assays using recombinant atypical BChE and serum BChE from a homozygous carrier; kinetic analysis with pyridostigmine, carbamates, and tacrine\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro enzymatic assay with recombinant protein and natural variant, single lab but two inhibitor classes tested\",\n      \"pmids\": [\"7489367\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Nine silent BCHE alleles with single amino acid substitutions were expressed in cell culture; variants BCHE*33C, BCHE*198G, and BCHE*201T produced normal amounts of immunoreactive but enzymatically inactive BChE protein, while six others caused reduced protein expression. This established that specific residues are required for catalytic activity (positions 33, 198, 201) versus protein folding/secretion (positions 37, 125, 170, 471, 518).\",\n      \"method\": \"Cell culture expression of mutant BCHE constructs; enzymatic activity assays; immunological protein quantification\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — heterologous expression with enzymatic and immunological readouts, multiple independent mutants characterized\",\n      \"pmids\": [\"8554068\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Purified human plasma BChE (tetrameric form) metabolizes cocaine to the pharmacologically inactive products ecgonine methylester and benzoic acid, with a Km of 11.9 µM and Vmax of 1.17 µM/min, indicating cocaine is tightly bound to the four active sites of the native tetramer.\",\n      \"method\": \"Enzyme kinetics with purified human plasma BChE using cocaine as substrate\",\n      \"journal\": \"Life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro enzymatic assay with purified enzyme, kinetic parameters determined, single lab\",\n      \"pmids\": [\"8622553\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"Southern blot analysis of DNA from individuals carrying the CHE2 C5+ plasma cholinesterase variant (also designated CHE2) showed that C5 complex production is not directed by a second butyrylcholinesterase gene, supporting that C5 is a hybrid enzyme formed by association of BChE subunits with a non-cholinesterase protein.\",\n      \"method\": \"Southern blot with probes for all four BCHE exons on DNA from CHE2 C5+ individuals\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct genomic Southern blot analysis, negative evidence (no second gene) from three unrelated individuals\",\n      \"pmids\": [\"2318303\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The novel BCHE variant p.Val204Asp disrupts the catalytic triad by breaking hydrogen bonding between Gln223 and Glu441, causing Ser198 and His438 to move apart. The mutant enzyme showed pure Michaelian kinetics with elevated Km (265 µM for butyrylthiocholine) and low Vmax, consistent with silent phenotype. Electrophoresis revealed reduced tetrameric enzyme and absence of fast-moving monomeric/dimeric forms in patient plasma.\",\n      \"method\": \"Kinetic analysis of patient plasma BChE; electrophoresis; molecular dynamics simulation; inhibition studies with dibucaine and fluoride\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — kinetic assay, electrophoretic characterization, and molecular dynamics simulation providing mechanistic explanation, multiple orthogonal methods\",\n      \"pmids\": [\"25054547\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"BChE hydrolyzes the peptide hormone ghrelin (the 'hunger hormone') in vivo, and viral gene transfer overexpression of BChE in mice led to lowered circulating ghrelin levels, reduced weight gain on high-fat diets, and reduced aggression, establishing a BChE-ghrelin axis with physiological consequences for metabolism and behavior.\",\n      \"method\": \"Viral gene transfer (overexpression) of BChE in mice; measurement of circulating ghrelin levels; metabolic and behavioral phenotyping\",\n      \"journal\": \"Chemico-biological interactions\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo gain-of-function with defined molecular target (ghrelin hydrolysis) and multiple phenotypic readouts, single lab\",\n      \"pmids\": [\"26915976\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Site-directed mutagenesis of four BCHE variants expressed in HEK 293T and CHO cells showed that G333C mutation reduced BChE activity by ~80% relative to wild-type, while K12R, V294M, and R470W variants did not significantly alter enzyme kinetic parameters, establishing specific residue requirements for catalytic activity.\",\n      \"method\": \"Site-directed mutagenesis; heterologous expression in HEK293T and CHO cells; Ellman method for butyrylthiocholine hydrolysis; enzyme kinetics\",\n      \"journal\": \"Pharmacogenetics and genomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstitution of multiple mutants in two cell systems with enzymatic kinetic readout\",\n      \"pmids\": [\"18300943\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Expression of BCHE mutant p.Leu88His in cell culture produced BChE with reduced kcat compared to wild-type, while molecular dynamics simulations indicated that this substitution destabilizes the Ω-loop, a structural element implicated in enzyme activity. Three other mutations (p.20delValPheGlyGlyThrValThr, p.Ile140del, p.Arg386Cys) produced no detectable BChE activity (silent phenotype).\",\n      \"method\": \"Recombinant BCHE mutant expression in transfected cells; kinetic analysis; molecular dynamics simulation\",\n      \"journal\": \"The pharmacogenomics journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — expression and kinetic characterization combined with molecular dynamics, single lab\",\n      \"pmids\": [\"33024248\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Expression of three natural BCHE variants (G75R, E90D, I99M) showed: G75R enzyme has ~45% of wild-type activity; I99M does not differ from wild-type; E90D displays a silent phenotype. The E90D silent phenotype is attributed to disruption of the salt bridge between E90 and R42, likely causing rapid intracellular degradation.\",\n      \"method\": \"Site-directed mutagenesis; expression in HEK293T and CHO cells; Ellman kinetic assay\",\n      \"journal\": \"Pharmacogenetics and genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — recombinant expression with enzymatic assay, structural reasoning supported by sequence analysis, single lab\",\n      \"pmids\": [\"17700357\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Purified BChE from human plasma hydrolyzed the lipid analog 4-methylumbelliferyl palmitate (4-mu palmitate) at pH 8 with a Km of 34.2 µM, comparable to wheat germ lipase. Competitive inhibition by 4-mu palmitate on butyrylthiocholine hydrolysis (Ki = 448 µM) and molecular docking confirmed that the palmitate substrate binds at the BChE active site, establishing a novel lipolytic activity for BChE.\",\n      \"method\": \"Enzymatic hydrolysis assay with purified BChE; lectin affinity chromatography; inhibition kinetics; molecular docking\",\n      \"journal\": \"Biochimie\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro enzymatic assay with purified enzyme and competitive inhibition kinetics, supported by docking, single lab\",\n      \"pmids\": [\"36126749\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"BChE interacts with and co-localizes with PRMT5 in hepatocytes. BChE deficiency (knockout) induces PRMT5 degradation via chaperone-mediated autophagy (CMA) by facilitating HSC70 recognition of PRMT5, which reduces ERK signaling and decreases LDLR transcription and LDL uptake. Hepatocyte-restricted BChE silencing in mice reduced plasma cholesterol, establishing a BChE-PRMT5-ERK-LDLR axis in cholesterol metabolism.\",\n      \"method\": \"Co-immunoprecipitation; LC-MS identification of BChE-interacting proteins; BChE knockout hepatocyte cell line; immunoblotting; DiI-LDL uptake assay; AAV8-mediated hepatocyte-restricted BChE knockdown in mice; high-fat diet model\",\n      \"journal\": \"Life sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP and MS interactome, CMA mechanistic validation, in vitro and in vivo corroboration with defined phenotypic readout\",\n      \"pmids\": [\"35065166\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"siRNA knockdown of BChE in R28 retinal cells caused upregulation of AChE and altered ERK1/2 and PKC signaling pathways, including modulation of transcription factors P90RSK1 and c-fos, establishing a counter-regulatory relationship between cholinesterases and their involvement in PKC/ERK signaling cross-talk relevant to cell fate determination.\",\n      \"method\": \"siRNA knockdown; Western blot for AChE, ERK1/2, PKC, P90RSK1, c-fos; electrophysiology; forskolin stimulation\",\n      \"journal\": \"Biochimie\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with defined molecular signaling readouts (ERK, PKC, transcription factors), single lab, multiple methods\",\n      \"pmids\": [\"21094673\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"AAV-mediated shRNA knockdown of BChE in mouse hippocampal CA1 region enhanced contextual fear memory and increased dendritic spine density; elevated glutamate levels and glutamine synthetase (GS) enzyme activity were detected in BChE knockdown animals and astrocytes, without elevation of ACh-hydrolyzing activity, establishing a role for BChE in regulating the astrocytic glutamate-glutamine cycle and cognition independently of acetylcholine hydrolysis.\",\n      \"method\": \"AAV-shRNA knockdown in mouse hippocampal CA1; behavioral fear conditioning; dendritic spine density measurement; GS enzymatic activity assay; glutamate level measurement in BChE-knockdown C8D1A astrocytes\",\n      \"journal\": \"Frontiers in psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo and in vitro loss-of-function with defined molecular (GS activity, glutamate) and behavioral readouts, single lab\",\n      \"pmids\": [\"33061920\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The CHE2 locus, which determines the C5 complex variant of BChE, is associated with haplotypes of the RAPH1 gene encoding lamellipodin. RAPH1 haplotypes were associated with CHE2 C5+ phenotype and with differential BChE activity levels, supporting that lamellipodin is the CHE2-encoded BChE-binding protein forming the C5 complex.\",\n      \"method\": \"SNP genotyping of RAPH1 and BCHE in CHE2 C5+ and C5- individuals; haplotype association analysis; BChE activity measurement\",\n      \"journal\": \"Annals of human genetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — genetic association only, no direct protein-protein interaction experiment; single lab, no biochemical reconstitution\",\n      \"pmids\": [\"27346732\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"L-lactate reduces in vitro inhibition of BChE by paraoxon in human plasma when added prior to paraoxon or pre-incubated with paraoxon, acting as a mixed inhibitor of BChE itself at high millimolar concentrations (Ki(EI) = 26 mM, K'I(EIS) = 81 mM), establishing that lactate can compete with organophosphate access to the BChE active site.\",\n      \"method\": \"In vitro BChE activity assay in human plasma; mixed-inhibition kinetics with varying lactate and paraoxon concentrations\",\n      \"journal\": \"Journal of applied toxicology : JAT\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinetic assay with defined inhibition constants, multiple concentration conditions, single lab\",\n      \"pmids\": [\"10513677\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Neuroprotective tri- and tetracyclic nitrogen-bridgehead compounds were kinetically characterized as pseudoirreversible BChE inhibitors acting via carbamate transfer to the active site serine of BChE, yielding reversible inhibitor products after carbamoylation; structural elements conferring BChE selectivity and rate of carbamoylation were identified by structure-activity analysis.\",\n      \"method\": \"In vitro enzymatic inhibition kinetics; structure-activity relationship analysis; carbamate transfer mechanism characterization\",\n      \"journal\": \"ACS medicinal chemistry letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinetic characterization of mechanism (carbamate transfer to active site), SAR analysis, single lab\",\n      \"pmids\": [\"24900407\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"BCHE encodes butyrylcholinesterase, a serine hydrolase whose catalytic triad (Ser198-His438-Glu441) and charged peripheral domains are required for hydrolysis of choline esters (including succinylcholine, cocaine, and ghrelin); natural and engineered variants at Asp70, Glu441, Val204, Glu90, and other residues alter catalytic activity, inhibitor binding, and protein stability; in hepatocytes, BChE interacts with PRMT5 to regulate the MEK-ERK-LDLR axis controlling cholesterol uptake, and in the CNS, BChE modulates the astrocytic glutamate-glutamine cycle and contextual fear memory independently of acetylcholine hydrolysis, while also functioning as a bioscavenger for organophosphates and carbamates in plasma.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"BCHE encodes butyrylcholinesterase, a secreted serine hydrolase that circulates in plasma as a tetramer and acts broadly as a choline-ester hydrolase and detoxification enzyme [#0, #3]. Its catalytic machinery depends on a charged Glu441-containing domain and on Ser198 and His438, with intramolecular contacts involving Asp70 and an Ω-loop element shaping substrate positioning; mutations at these and other residues (Val204, Glu441, Gln223) disrupt the catalytic triad and abolish or reduce activity, while substitutions such as Asp70Gly additionally weaken inhibitor and scavenger binding [#0, #1, #5, #8]. Systematic expression of natural variants resolves residues required for catalysis (e.g., 33, 198, 201, 333) from those required for folding and secretion (e.g., 37, 90, 125, 170), where loss of stabilizing contacts such as the Glu90-Arg42 salt bridge drives intracellular degradation and a silent phenotype [#2, #7, #9]. Beyond classical choline esters, BChE hydrolyzes cocaine to inactive products, the orexigenic peptide ghrelin, and a palmitate lipid analog, linking it to drug metabolism, metabolic regulation, and behavior [#3, #6, #10]. BChE also carries out enzyme-independent regulatory roles: in hepatocytes it binds PRMT5 and stabilizes it against chaperone-mediated autophagy, sustaining ERK signaling and LDLR-driven cholesterol uptake [#11], and in hippocampal and astrocytic systems it modulates the glutamate-glutamine cycle and contextual fear memory without elevating acetylcholine-hydrolyzing activity [#13]. As a plasma bioscavenger, BChE is targeted and inhibited by carbamates and organophosphates through serine carbamoylation, an activity sensitive to active-site competition by ligands such as L-lactate [#1, #15, #16].\",\n  \"teleology\": [\n    {\n      \"year\": 1992,\n      \"claim\": \"Established which structural elements build BChE's functional catalytic triad and inhibitor-binding sites, defining the residues that make the enzyme catalytically competent.\",\n      \"evidence\": \"Site-directed mutagenesis of the Glu441 domain and Asp70 in human BCHE expressed in Xenopus oocytes with kinetic and dibucaine-inhibition assays\",\n      \"pmids\": [\"1373381\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No crystal structure in this study to confirm triad geometry directly\", \"Did not address tetramer assembly or secretion\"]\n    },\n    {\n      \"year\": 1990,\n      \"claim\": \"Resolved whether the C5 plasma cholinesterase complex arises from a second BChE gene, showing it is instead a hybrid of BChE with another protein.\",\n      \"evidence\": \"Southern blot with BCHE exon probes on DNA from CHE2 C5+ individuals\",\n      \"pmids\": [\"2318303\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of the partner protein not determined here\", \"Negative genomic evidence does not define the physical interaction\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Showed that the atypical Asp70Gly variant has markedly reduced affinity for carbamate inhibitors and tacrine, establishing Asp70 as critical for inhibitor binding and scavenger function.\",\n      \"evidence\": \"Enzyme inhibition assays with recombinant atypical BChE and serum from a homozygous carrier across carbamate and acridine inhibitors\",\n      \"pmids\": [\"7489367\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Did not test in vivo scavenger efficacy\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Separated catalytic from folding/secretion defects among silent BCHE alleles, mapping residues required for activity versus protein stability.\",\n      \"evidence\": \"Cell-culture expression of nine mutant constructs with paired enzymatic and immunological readouts\",\n      \"pmids\": [\"8554068\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of folding failure not structurally resolved for each variant\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Demonstrated that plasma BChE tetramer metabolizes cocaine to inactive products, defining a detoxification substrate beyond choline esters.\",\n      \"evidence\": \"Enzyme kinetics with purified human plasma BChE using cocaine as substrate\",\n      \"pmids\": [\"8622553\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vitro only\", \"Physiological clearance rates in vivo not established here\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Extended the variant catalog by linking specific substitutions to activity loss via Ω-loop destabilization or salt-bridge disruption, mechanistically explaining several silent phenotypes.\",\n      \"evidence\": \"Recombinant expression in HEK293T/CHO cells with Ellman kinetics and molecular dynamics simulations for L88H, E90D, and other variants\",\n      \"pmids\": [\"33024248\", \"17700357\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Degradation pathway for unstable variants inferred, not directly traced\", \"Single lab\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Distinguished functionally consequential from neutral natural variants, isolating G333C as activity-reducing among several tested.\",\n      \"evidence\": \"Site-directed mutagenesis and heterologous expression in two cell systems with butyrylthiocholine kinetics\",\n      \"pmids\": [\"18300943\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of G333C effect not resolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Provided an atomic-level explanation of how the p.Val204Asp variant disrupts the catalytic triad and impairs tetramer assembly.\",\n      \"evidence\": \"Patient plasma kinetics, electrophoresis, inhibition studies, and molecular dynamics simulation\",\n      \"pmids\": [\"25054547\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"MD-predicted triad displacement not confirmed by crystallography\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Showed that L-lactate competes at the BChE active site and can limit organophosphate inhibition, identifying a small-molecule modulator of scavenger activity.\",\n      \"evidence\": \"In vitro mixed-inhibition kinetics in human plasma with varying lactate and paraoxon\",\n      \"pmids\": [\"10513677\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological relevance at lower lactate levels unclear\", \"Single lab\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defined the carbamate-transfer mechanism of pseudoirreversible BChE inhibitors and the structural determinants of BChE selectivity.\",\n      \"evidence\": \"In vitro inhibition kinetics and structure-activity analysis of nitrogen-bridgehead compounds\",\n      \"pmids\": [\"24900407\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No co-crystal structures\", \"Selectivity tested against limited targets\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Uncovered a counter-regulatory, signaling-level relationship between BChE and AChE through ERK/PKC pathways, beyond ester hydrolysis.\",\n      \"evidence\": \"siRNA knockdown in R28 retinal cells with Western blotting of AChE, ERK1/2, PKC, and transcription factors\",\n      \"pmids\": [\"21094673\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism connecting BChE loss to AChE upregulation undefined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified ghrelin as an in vivo BChE substrate, linking the enzyme to metabolism and behavior through hormone hydrolysis.\",\n      \"evidence\": \"Viral BChE overexpression in mice with ghrelin measurement and metabolic/behavioral phenotyping\",\n      \"pmids\": [\"26915976\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Gain-of-function only\", \"Endogenous contribution to ghrelin turnover not quantified\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Genetically associated the CHE2 C5 complex with RAPH1/lamellipodin, nominating the partner forming the BChE hybrid complex.\",\n      \"evidence\": \"RAPH1/BCHE haplotype association analysis in CHE2 C5+/C5- individuals with BChE activity measurement\",\n      \"pmids\": [\"27346732\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Genetic association only, no direct protein-protein interaction or reconstitution\", \"Single lab\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Established a non-cholinergic CNS role for BChE in regulating the astrocytic glutamate-glutamine cycle and contextual fear memory.\",\n      \"evidence\": \"AAV-shRNA knockdown in mouse hippocampal CA1 plus astrocyte assays of glutamine synthetase activity and glutamate, with behavioral testing\",\n      \"pmids\": [\"33061920\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular link between BChE and GS activity not defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Revealed an enzyme-independent scaffolding function: BChE stabilizes PRMT5 against chaperone-mediated autophagy to sustain ERK-LDLR-driven hepatic cholesterol uptake.\",\n      \"evidence\": \"Reciprocal Co-IP and MS interactome, CMA/HSC70 mechanistic assays, BChE-knockout hepatocytes, LDL uptake assays, and AAV8 hepatocyte-restricted knockdown in mice\",\n      \"pmids\": [\"35065166\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the BChE-PRMT5 interaction unknown\", \"Whether catalytic activity is dispensable not fully dissected\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Added lipolytic activity to BChE's substrate repertoire, showing palmitate-ester hydrolysis at the same active site.\",\n      \"evidence\": \"Hydrolysis of 4-mu palmitate by purified plasma BChE with competitive-inhibition kinetics and molecular docking\",\n      \"pmids\": [\"36126749\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological lipid substrate not identified\", \"In vitro only\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How BChE's catalytic versus non-catalytic (scaffolding/signaling) functions are partitioned across tissues, and the structural basis of its protein-protein interactions, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of BChE-PRMT5 or BChE-lamellipodin complexes\", \"Endogenous physiological substrates for ghrelin/lipid activities not established in humans\", \"Mechanism linking BChE to astrocytic glutamine synthetase undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0, 3, 6, 10]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [3, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [3, 6, 10, 11]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [11, 12]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [13]}\n    ],\n    \"complexes\": [\"C5 cholinesterase complex\"],\n    \"partners\": [\"PRMT5\", \"HSC70\", \"RAPH1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}