{"gene":"PF3D7_0615100","run_date":"2026-09-08T12:51:26","timeline":{"discoveries":[{"year":2001,"finding":"ENR (enoyl-ACP reductase) purified from P. falciparum is inhibited by triclosan; incorporation of [14C]acetate and [14C]malonyl-CoA into fatty acids in vivo and in vitro was blocked by triclosan, establishing ENR as the target and confirming existence of a de novo type II fatty acid biosynthesis pathway in this parasite.","method":"Enzyme purification, in vitro fatty acid labeling assay with [14C]acetate and [14C]malonyl-CoA, enzyme inhibition assay","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct biochemical assay with purified enzyme and isotope labeling, replicated by multiple subsequent studies","pmids":["11175846"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2001,"finding":"Triclosan shows competitive inhibition kinetics with respect to NADH but is uncompetitive with respect to NAD+, indicating that triclosan binding to ENR is facilitated in the presence of NAD+. Km values for crotonyl-CoA and NADH were determined as 165 µM and 33 µM, respectively.","method":"Recombinant expression in E. coli, steady-state enzyme kinetics","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinetic characterization of purified recombinant enzyme, single lab, two kinetic parameters","pmids":["11735121"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2002,"finding":"Crystal structures of P. falciparum ENR were solved as a binary complex with NADH, a ternary complex with triclosan and NAD+, and ternary complexes with triclosan analogs and NADH. ENR was found to be a 50 kDa protein predicted to localize to the apicoplast. Novel structural features were identified in the binding loop region resembling bacterial homologs; the structural basis of triclosan binding was defined.","method":"Cloning, recombinant expression, protein purification, X-ray crystallography","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structures solved at 2.2 Å with multiple ligand complexes, replicated and extended by subsequent structural studies","pmids":["11792710"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2004,"finding":"Triclosan is a slow-tight-binding inhibitor of P. falciparum ENR, following a two-step mechanism: rapid formation of a reversible enzyme-inhibitor complex (EI) that isomerizes to a tighter complex (EI*). Rate constants were ki(forward) = 5.49×10-2 s-1 and ki(reverse) = 1×10-4 s-1; Ki = 53 nM, Ki* = 96 pM.","method":"Steady-state kinetics, fluorescence spectroscopy, surface plasmon resonance","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple orthogonal methods (kinetics, fluorescence, SPR) in one study characterizing the inhibition mechanism","pmids":["15086316"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2004,"finding":"Mutational analysis of ENR active-site residues identified Ala-217, Asn-218, Met-281, and Phe-368 as critical for triclosan binding. The A217V mutation caused >7000-fold reduction in triclosan binding affinity, while A217G caused only 10-fold reduction, demonstrating the importance of steric constraints at this position.","method":"Site-directed mutagenesis, enzyme inhibition assays, binding affinity measurements","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — active-site mutagenesis with quantitative binding affinity measurements across multiple mutants","pmids":["15139852"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2007,"finding":"X-ray crystal structures of five triclosan analogs in complex with P. falciparum ENR revealed flexibility of the active site and a structure-activity relationship for the 5-substituent; replacement of the 5-chloro group with larger hydrophobic moieties improved inhibitory potency against purified ENR (IC50 < 200 nM).","method":"X-ray crystallography of ENR-inhibitor complexes, enzyme inhibition assays, in vitro parasite growth inhibition","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple crystal structures with functional validation by enzyme assay, single lab","pmids":["17567585"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2007,"finding":"Crystal structures of P. falciparum ENR in complex with NAD+ and triclosan were solved to 2.2 Å. Structural comparison with T. gondii ENR revealed that although active sites are broadly similar to bacterial counterparts, differences in the drug-binding pocket reduce packing interactions with several inhibitors, explaining lower affinity of apicomplexan ENR for aminopyridine-based inhibitors.","method":"X-ray crystallography","journal":"Acta crystallographica. Section D, Biological crystallography","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structures from two independent labs defining the active-site pocket","pmids":["17327670"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2008,"finding":"Deletion of fabI in P. falciparum did not impede asexual blood-stage growth, but FabI-deficient P. berghei sporozoites were markedly less infective for mice and failed to complete liver-stage development in vitro, specifically failing to form intrahepatic merosomes. This established that ENR is essential for liver-stage but not blood-stage development.","method":"Targeted gene deletion (knockout) in P. falciparum and P. berghei, mouse infection model, in vitro liver-stage development assay","journal":"Cell host & microbe","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockout with defined stage-specific phenotypic readout, confirmed in two Plasmodium species, replicated by an independent study (PMID:19068099)","pmids":["19064257"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium berghei","strain":""}]},{"year":2008,"finding":"FAS II enzymes including ENR (FabI) localize to the sporozoite and liver-stage apicoplast in P. yoelii. Targeted deletion of fabI (FabI) in P. falciparum confirmed no reduction in asexual blood-stage replication. FAS II-deficient P. yoelii liver stages failed to form exo-erythrocytic merozoites, establishing that ENR function is required for the liver-to-blood transition.","method":"Targeted gene deletion, fluorescence localization (apicoplast colocalization), mouse liver-stage infection model","journal":"Cellular microbiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockout with specific phenotypic readout, direct localization, replicated across species and by concurrent independent study (PMID:19064257)","pmids":["19068099"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium yoelii","strain":""}]},{"year":2013,"finding":"In P. falciparum, ENR (FabI) protein is expressed in mosquito midgut oocysts and sporozoites and in liver-stage parasites but not during blood stages. FabI colocalizes with apicoplast-targeted acyl carrier protein in these stages. Targeted deletion of fabI abolished sporozoite development within the midgut oocyst, revealing that FAS II is essential for P. falciparum sporozoite development — an important distinction from rodent malaria models where FAS II is required in liver stage but not oocyst stage.","method":"Immunofluorescence with anti-FabI antibodies, colocalization with ACP (apicoplast marker), targeted gene deletion, mosquito stage development assay","journal":"Eukaryotic cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct protein localization plus stage-specific functional knockout with defined phenotypic readout","pmids":["24297444"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2007,"finding":"Flavonoids including luteolin and (-)-catechin gallate act as tight-binding noncompetitive inhibitors of P. falciparum ENR (FabI), as established by kinetic analysis. FabG was inhibited noncompetitively and FabZ competitively by the same compounds, demonstrating distinct inhibition modes for each FAS II enzyme.","method":"Enzyme inhibition kinetics with purified recombinant enzymes, in vitro parasite growth assay","journal":"Journal of medicinal chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — kinetic characterization of inhibition mode for purified enzyme, single lab","pmids":["16722653"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2007,"finding":"In vitro reconstitution of the complete FAS II elongation module of P. falciparum — including ENR (FabI) together with FabB/F, FabG, and FabZ — demonstrated that these four enzymes are sufficient to reconstitute fatty acid chain elongation from butyryl-ACP. Inhibition of ENR by triclosan or NAS-21/91 caused accumulation of the substrate intermediate detectable by MALDI-TOF MS, confirming ENR's role as the terminal reductive step in each elongation cycle.","method":"In vitro reconstitution of multienzyme pathway, MALDI-TOF mass spectrometry","journal":"Antimicrobial agents and chemotherapy","confidence":"High","confidence_rationale":"Tier 1 / Moderate — biochemical reconstitution with defined substrates and inhibitors, multiple orthogonal readouts","pmids":["17485508"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2003,"finding":"Novel inhibitor classes (identified by high-throughput screening) inhibit P. falciparum ENR enzyme activity without requiring metabolic activation, and are effective against wild-type and drug-resistant P. falciparum strains. Crystal structure of the M. tuberculosis ENR homolog (InhA) with one inhibitor revealed a unique stoichiometry where either one or two triclosan molecules could bind the active site.","method":"High-throughput enzyme inhibition screen, X-ray crystallography (InhA), in vitro parasite growth assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — enzyme activity against PfENR confirmed biochemically, crystal structure is for bacterial homolog not PfENR itself","pmids":["12606558"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2008,"finding":"(E)-Oroidin from the marine sponge Agelas oroides is an uncompetitive inhibitor of P. falciparum ENR with Ki values of 0.4 ± 0.2 µM (with respect to substrate) and 0.8 ± 0.2 µM (with respect to cofactor). Delta5,9 fatty acid mixtures also inhibit PfENR with IC50 ≈ 0.35 µg/ml.","method":"Activity-guided isolation, enzyme kinetic inhibition studies with purified PfENR","journal":"Bioorganic & medicinal chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — kinetic mode of inhibition determined for purified enzyme, single lab, natural product characterization","pmids":["17765547"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2011,"finding":"Mutation of Ala372 in the substrate-binding loop of P. falciparum ENR to Met (A372M) increased affinity for triclosan approximately twofold and introduced a more hydrophobic environment resembling E. coli ENR. Crystal structure of the A372M mutant confirmed altered active-site contacts. Mutations disrupting a conserved salt bridge that stabilizes the substrate-binding loop caused loss of function, except when an alternative water-bridge network was formed.","method":"Site-directed mutagenesis, X-ray crystallography, enzyme kinetics","journal":"IUBMB life","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis combined with crystal structure and kinetic measurements in one study","pmids":["21280175"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2011,"finding":"Steady-state kinetics, pre-steady-state kinetics, and equilibrium fluorescence spectroscopy established the ordered kinetic mechanism of P. falciparum ENR, and showed that a pentacyano(isoniazid)ferrateII inorganic complex inhibits ENR with slow-onset kinetics.","method":"Steady-state kinetics, pre-steady-state kinetics, equilibrium fluorescence spectroscopy","journal":"Enzyme research","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — multiple kinetic methods characterizing enzyme mechanism, single lab, limited by abstract detail","pmids":["21603269"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2010,"finding":"X-ray crystal structures of P. falciparum ENR complexed with multiple triclosan variants revealed that substitutions at 4' and 2' positions increase interactions with the protein, cofactor, and solvent. Substitution at the 2' position relocates a conserved water molecule, creating an additional hydrogen bond. Unsubstituted 2'/4' compounds shift position within the hydrophobic pocket to compensate for lost halogen interactions.","method":"X-ray crystallography, in vitro parasite culture inhibition assay","journal":"IUBMB life","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — crystal structures of multiple enzyme-inhibitor complexes, single lab","pmids":["20503440"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2013,"finding":"Crystal structures of two coumarin-based triclosan analogs (compounds 7 and 11) in complex with P. falciparum ENR confirmed their binding mode within the active site and validated docking predictions, establishing structure-activity relationships for this inhibitor class.","method":"X-ray crystallography of ENR-inhibitor complexes, enzyme inhibition assays","journal":"Journal of medicinal chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — crystal structures with functional validation, single lab","pmids":["24063369"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2014,"finding":"Celastrol was identified as a noncompetitive, low-micromolar inhibitor of P. falciparum ENR in an in vitro activity assay, demonstrating a mode of inhibition distinct from triclosan.","method":"Structure-based virtual docking, in vitro enzyme activity assay","journal":"Bioorganic & medicinal chemistry","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single enzyme inhibition assay with no structural or mechanistic follow-up, single lab","pmids":["25284249"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"current_model":"P. falciparum ENR (PF3D7_0615100) is the NADH-dependent enoyl-ACP reductase of the apicoplast-localized type II fatty acid synthesis pathway, catalyzing the final reductive step of each fatty acid elongation cycle; its crystal structure has been determined in multiple ligand-bound states, its ordered kinetic mechanism and slow-tight-binding inhibition by triclosan (Ki* ~96 pM) have been characterized in vitro, active-site residues critical for inhibitor binding have been defined by mutagenesis, and genetic knockout experiments in P. falciparum and rodent Plasmodium species have established that ENR is dispensable for asexual blood-stage replication but essential for sporozoite development within mosquito oocysts (P. falciparum) and for liver-stage completion and the liver-to-blood transition (P. berghei/yoelii)."},"narrative":{"mechanistic_narrative":"PF3D7_0615100 (ENR) is the NADH-dependent enoyl-ACP reductase of the apicoplast-localized type II fatty acid synthesis (FAS II) pathway in Plasmodium falciparum, catalyzing the terminal reductive step of each fatty acid elongation cycle [PMID:11175846, PMID:17485508]. Its role was fixed biochemically by in vitro reconstitution of the complete FAS II elongation module (ENR together with FabB/F, FabG, and FabZ), where inhibition of ENR caused accumulation of the upstream enoyl substrate intermediate, confirming ENR as the enzyme that completes each round of chain elongation [PMID:17485508]. Kinetically, ENR follows an ordered mechanism, uses NADH as reductant and enoyl-CoA/ACP substrates (Km values of 165 µM for crotonyl-CoA and 33 µM for NADH), and is inhibited by triclosan through a slow-tight-binding two-step mechanism (Ki = 53 nM, Ki* ≈ 96 pM) that is competitive with NADH and facilitated by NAD+ [PMID:11735121, PMID:15086316, PMID:21603269]. Crystal structures in binary (NADH) and ternary (triclosan/NAD+) states, combined with active-site mutagenesis, define the drug-binding pocket and identify residues Ala-217, Asn-218, Met-281, Phe-368 and the substrate-binding-loop residue Ala-372 as determinants of inhibitor binding and enzyme function [PMID:11792710, PMID:15139852, PMID:21280175]. Genetic knockout established that ENR is dispensable for asexual blood-stage replication but stage-specifically essential: FabI-deficient parasites fail in liver-stage development and the liver-to-blood transition in rodent Plasmodium (P. berghei/P. yoelii), whereas in P. falciparum deletion abolishes sporozoite development within mosquito midgut oocysts [PMID:19064257, PMID:19068099, PMID:24297444]. ENR protein localizes to the apicoplast of oocyst, sporozoite, and liver stages, colocalizing with acyl carrier protein [PMID:19068099, PMID:24297444].","teleology":[{"year":2001,"claim":"Establishing that Plasmodium possesses a druggable de novo FAS II pathway required demonstrating that a specific enzyme, ENR, catalyzes fatty acid synthesis and can be pharmacologically blocked.","evidence":"Enzyme purification and [14C]acetate/[14C]malonyl-CoA fatty acid labeling with triclosan inhibition in P. falciparum","pmids":["11175846"],"confidence":"High","gaps":["Did not resolve the precise chemical step catalyzed within the elongation cycle","Did not define kinetic parameters or cofactor preference"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2001,"claim":"Defining the cofactor dependence and inhibition logic clarified how triclosan engages ENR, showing NAD+ facilitates inhibitor binding and NADH competes with it.","evidence":"Recombinant expression in E. coli and steady-state kinetics of purified P. falciparum ENR","pmids":["11735121"],"confidence":"High","gaps":["Kinetics used crotonyl-CoA rather than physiological enoyl-ACP substrate","Two kinetic parameters only; full mechanism not resolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2002,"claim":"Solving the ENR crystal structure in ligand-bound states provided the structural basis for cofactor and inhibitor binding and its apicoplast targeting prediction.","evidence":"X-ray crystallography of binary NADH and ternary triclosan/NAD+ complexes of P. falciparum ENR","pmids":["11792710"],"confidence":"High","gaps":["Structural prediction of apicoplast localization not yet experimentally confirmed","Substrate (enoyl-ACP) complex not captured"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2004,"claim":"Characterizing triclosan as a slow-tight-binding inhibitor and mapping the residues that control its binding explained the exceptional potency and defined the drug-binding pocket.","evidence":"Steady-state kinetics, fluorescence, SPR, and active-site site-directed mutagenesis of P. falciparum ENR","pmids":["15086316","15139852"],"confidence":"High","gaps":["Whether these residues also govern natural substrate turnover not fully separated from inhibitor binding","Mutant enzyme stability/catalytic effects not exhaustively profiled"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2007,"claim":"Reconstituting the four-enzyme FAS II elongation module in vitro placed ENR mechanistically as the terminal reductive step of each elongation cycle.","evidence":"In vitro multienzyme reconstitution from butyryl-ACP with MALDI-TOF detection of intermediate accumulation upon ENR inhibition, P. falciparum enzymes","pmids":["17485508"],"confidence":"High","gaps":["Physiological chain-length products and in vivo flux not quantified","Interplay with acyl carrier protein handoff not structurally resolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2007,"claim":"Comparative structures and expanded inhibitor complexes refined the active-site pocket and explained species-selective inhibitor affinity within apicomplexan ENRs.","evidence":"X-ray crystallography of ENR-inhibitor complexes plus enzyme and parasite growth inhibition, with comparison to T. gondii ENR","pmids":["17567585","17327670"],"confidence":"High","gaps":["Structural insights not yet translated to whole-parasite efficacy against relevant stages","Selectivity over human targets not addressed here"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2008,"claim":"Genetic knockout resolved when ENR is actually required, showing it is dispensable in blood stages but essential for liver-stage development and the liver-to-blood transition in rodent malaria.","evidence":"Targeted fabI deletion in P. falciparum and P. berghei/P. yoelii, apicoplast colocalization, and mouse liver-stage infection assays","pmids":["19064257","19068099"],"confidence":"High","gaps":["Does not explain why blood stages tolerate loss (fatty acid scavenging vs synthesis)","Molecular cause of merosome/merozoite formation failure not defined"],"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium berghei","strain":""},{"species":"Plasmodium yoelii","strain":""}]},{"year":2013,"claim":"Stage-specific expression and knockout in P. falciparum revealed a species divergence: ENR is required for sporozoite development within mosquito oocysts, distinct from the liver-stage requirement in rodent models.","evidence":"Immunofluorescence with anti-FabI antibodies, ACP colocalization, and targeted fabI deletion with mosquito-stage development assays in P. falciparum","pmids":["24297444"],"confidence":"High","gaps":["Mechanistic basis for the oocyst-versus-liver-stage requirement difference across species unresolved","Downstream lipid products required at each stage not identified"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2011,"claim":"Full kinetic dissection established the ordered mechanism of ENR and extended slow-onset inhibition to additional chemotypes, while mutagenesis linked the substrate-binding loop and a conserved salt bridge to catalytic function.","evidence":"Steady-state/pre-steady-state kinetics, fluorescence, and A372M mutagenesis with crystallography of P. falciparum ENR","pmids":["21603269","21280175"],"confidence":"High","gaps":["Rate-limiting step and full microscopic rate constants not comprehensively reported","Functional consequence of loop dynamics in vivo untested"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2013,"claim":"Diverse inhibitor chemotypes and structure-activity studies mapped how the ENR active site accommodates and can be tuned toward alternative scaffolds.","evidence":"Enzyme inhibition kinetics, natural-product isolation, HTS, virtual docking, and crystallography of P. falciparum ENR-inhibitor complexes (triclosan analogs, coumarins, flavonoids, oroidin, celastrol)","pmids":["16722653","12606558","17765547","20503440","24063369","25284249"],"confidence":"Medium","gaps":["Several inhibitor modes rest on single-lab enzyme assays without structural follow-up (e.g. celastrol)","Whole-parasite and stage-specific efficacy of most chemotypes not established"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":null,"claim":"It remains unresolved why blood-stage parasites tolerate loss of ENR while transmission and liver stages depend on it, and what specific lipid products of FAS II are required at each essential stage.","evidence":"","pmids":[],"confidence":"Medium","gaps":["Fatty acid products downstream of ENR not linked to a stage-specific requirement","Balance between de novo synthesis and host lipid scavenging across stages not defined"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":["FAS II elongation module (ENR/FabI with FabB/F, FabG, FabZ) reconstituted in vitro [#11]"],"partners":["ACYL CARRIER PROTEIN (ACP) — APICOPLAST COLOCALIZATION MARKER [#8, #9]","FABB/F, FABG, FABZ — CO-FUNCTIONAL FAS II ELONGATION ENZYMES [#11]"],"other_free_text":["NADH-dependent, ordered kinetic mechanism; Km crotonyl-CoA 165 µM, Km NADH 33 µM [#1, #15]","Triclosan is a slow-tight-binding inhibitor (Ki 53 nM, Ki* ~96 pM), competitive with NADH and facilitated by NAD+ [#1, #3]","Active-site/inhibitor-binding residues: Ala-217, Asn-218, Met-281, Phe-368; substrate-binding-loop residue Ala-372 and a conserved salt bridge govern function [#4, #14]","Dispensable for asexual blood-stage replication; essential for P. falciparum oocyst sporozoite development and for rodent Plasmodium liver-stage completion / liver-to-blood transition [#7, #8, #9]"]}},"prefetch_data":{},"corpus_meta":[{"pmid":"11175846","id":"PMC_11175846","title":"Triclosan offers protection against blood stages of malaria by inhibiting enoyl-ACP reductase of Plasmodium falciparum.","date":"2001","source":"Nature medicine","url":"https://pubmed.ncbi.nlm.nih.gov/11175846","citation_count":356,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["FABI"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"19068099","id":"PMC_19068099","title":"Type II fatty acid synthesis is essential only for malaria parasite late liver stage development.","date":"2008","source":"Cellular microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/19068099","citation_count":316,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["FABI"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"19064257","id":"PMC_19064257","title":"The fatty acid biosynthesis enzyme FabI plays a key role in the development of liver-stage malarial parasites.","date":"2008","source":"Cell host & microbe","url":"https://pubmed.ncbi.nlm.nih.gov/19064257","citation_count":236,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["FABI"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"12606558","id":"PMC_12606558","title":"Targeting tuberculosis and malaria through inhibition of Enoyl reductase: compound activity and structural data.","date":"2003","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12606558","citation_count":209,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["ENR"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"11792710","id":"PMC_11792710","title":"Structural elucidation of the specificity of the antibacterial agent triclosan for malarial enoyl acyl carrier protein reductase.","date":"2002","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11792710","citation_count":177,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["ENR"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"11239932","id":"PMC_11239932","title":"Triclosan inhibits the growth of Plasmodium falciparum and Toxoplasma gondii by inhibition of apicomplexan Fab I.","date":"2001","source":"International journal for parasitology","url":"https://pubmed.ncbi.nlm.nih.gov/11239932","citation_count":163,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["ENR"],"competing_organism_flag":true,"competing_organism_match":"Toxoplasma","competing_organism_only":false},{"pmid":"16722653","id":"PMC_16722653","title":"Inhibition of Plasmodium falciparum fatty acid biosynthesis: evaluation of FabG, FabZ, and FabI as drug 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ENR as the target and confirming existence of a de novo type II fatty acid biosynthesis pathway in this parasite.\",\n      \"method\": \"Enzyme purification, in vitro fatty acid labeling assay with [14C]acetate and [14C]malonyl-CoA, enzyme inhibition assay\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct biochemical assay with purified enzyme and isotope labeling, replicated by multiple subsequent studies\",\n      \"pmids\": [\"11175846\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Triclosan shows competitive inhibition kinetics with respect to NADH but is uncompetitive with respect to NAD+, indicating that triclosan binding to ENR is facilitated in the presence of NAD+. Km values for crotonyl-CoA and NADH were determined as 165 µM and 33 µM, respectively.\",\n      \"method\": \"Recombinant expression in E. coli, steady-state enzyme kinetics\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinetic characterization of purified recombinant enzyme, single lab, two kinetic parameters\",\n      \"pmids\": [\"11735121\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Crystal structures of P. falciparum ENR were solved as a binary complex with NADH, a ternary complex with triclosan and NAD+, and ternary complexes with triclosan analogs and NADH. ENR was found to be a 50 kDa protein predicted to localize to the apicoplast. Novel structural features were identified in the binding loop region resembling bacterial homologs; the structural basis of triclosan binding was defined.\",\n      \"method\": \"Cloning, recombinant expression, protein purification, X-ray crystallography\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structures solved at 2.2 Å with multiple ligand complexes, replicated and extended by subsequent structural studies\",\n      \"pmids\": [\"11792710\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Triclosan is a slow-tight-binding inhibitor of P. falciparum ENR, following a two-step mechanism: rapid formation of a reversible enzyme-inhibitor complex (EI) that isomerizes to a tighter complex (EI*). Rate constants were ki(forward) = 5.49×10-2 s-1 and ki(reverse) = 1×10-4 s-1; Ki = 53 nM, Ki* = 96 pM.\",\n      \"method\": \"Steady-state kinetics, fluorescence spectroscopy, surface plasmon resonance\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple orthogonal methods (kinetics, fluorescence, SPR) in one study characterizing the inhibition mechanism\",\n      \"pmids\": [\"15086316\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Mutational analysis of ENR active-site residues identified Ala-217, Asn-218, Met-281, and Phe-368 as critical for triclosan binding. The A217V mutation caused >7000-fold reduction in triclosan binding affinity, while A217G caused only 10-fold reduction, demonstrating the importance of steric constraints at this position.\",\n      \"method\": \"Site-directed mutagenesis, enzyme inhibition assays, binding affinity measurements\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — active-site mutagenesis with quantitative binding affinity measurements across multiple mutants\",\n      \"pmids\": [\"15139852\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"X-ray crystal structures of five triclosan analogs in complex with P. falciparum ENR revealed flexibility of the active site and a structure-activity relationship for the 5-substituent; replacement of the 5-chloro group with larger hydrophobic moieties improved inhibitory potency against purified ENR (IC50 < 200 nM).\",\n      \"method\": \"X-ray crystallography of ENR-inhibitor complexes, enzyme inhibition assays, in vitro parasite growth inhibition\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple crystal structures with functional validation by enzyme assay, single lab\",\n      \"pmids\": [\"17567585\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Crystal structures of P. falciparum ENR in complex with NAD+ and triclosan were solved to 2.2 Å. Structural comparison with T. gondii ENR revealed that although active sites are broadly similar to bacterial counterparts, differences in the drug-binding pocket reduce packing interactions with several inhibitors, explaining lower affinity of apicomplexan ENR for aminopyridine-based inhibitors.\",\n      \"method\": \"X-ray crystallography\",\n      \"journal\": \"Acta crystallographica. Section D, Biological crystallography\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structures from two independent labs defining the active-site pocket\",\n      \"pmids\": [\"17327670\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Deletion of fabI in P. falciparum did not impede asexual blood-stage growth, but FabI-deficient P. berghei sporozoites were markedly less infective for mice and failed to complete liver-stage development in vitro, specifically failing to form intrahepatic merosomes. This established that ENR is essential for liver-stage but not blood-stage development.\",\n      \"method\": \"Targeted gene deletion (knockout) in P. falciparum and P. berghei, mouse infection model, in vitro liver-stage development assay\",\n      \"journal\": \"Cell host & microbe\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knockout with defined stage-specific phenotypic readout, confirmed in two Plasmodium species, replicated by an independent study (PMID:19068099)\",\n      \"pmids\": [\"19064257\"],\n      \"is_preprint\": false,\n      \"attribution\": [\n        {\"species\": \"Plasmodium falciparum\", \"strain\": \"\"},\n        {\"species\": \"Plasmodium berghei\", \"strain\": \"\"}\n      ]\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"FAS II enzymes including ENR (FabI) localize to the sporozoite and liver-stage apicoplast in P. yoelii. Targeted deletion of fabI (FabI) in P. falciparum confirmed no reduction in asexual blood-stage replication. FAS II-deficient P. yoelii liver stages failed to form exo-erythrocytic merozoites, establishing that ENR function is required for the liver-to-blood transition.\",\n      \"method\": \"Targeted gene deletion, fluorescence localization (apicoplast colocalization), mouse liver-stage infection model\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockout with specific phenotypic readout, direct localization, replicated across species and by concurrent independent study (PMID:19064257)\",\n      \"pmids\": [\"19068099\"],\n      \"is_preprint\": false,\n      \"attribution\": [\n        {\"species\": \"Plasmodium falciparum\", \"strain\": \"\"},\n        {\"species\": \"Plasmodium yoelii\", \"strain\": \"\"}\n      ]\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"In P. falciparum, ENR (FabI) protein is expressed in mosquito midgut oocysts and sporozoites and in liver-stage parasites but not during blood stages. FabI colocalizes with apicoplast-targeted acyl carrier protein in these stages. Targeted deletion of fabI abolished sporozoite development within the midgut oocyst, revealing that FAS II is essential for P. falciparum sporozoite development — an important distinction from rodent malaria models where FAS II is required in liver stage but not oocyst stage.\",\n      \"method\": \"Immunofluorescence with anti-FabI antibodies, colocalization with ACP (apicoplast marker), targeted gene deletion, mosquito stage development assay\",\n      \"journal\": \"Eukaryotic cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct protein localization plus stage-specific functional knockout with defined phenotypic readout\",\n      \"pmids\": [\"24297444\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Flavonoids including luteolin and (-)-catechin gallate act as tight-binding noncompetitive inhibitors of P. falciparum ENR (FabI), as established by kinetic analysis. FabG was inhibited noncompetitively and FabZ competitively by the same compounds, demonstrating distinct inhibition modes for each FAS II enzyme.\",\n      \"method\": \"Enzyme inhibition kinetics with purified recombinant enzymes, in vitro parasite growth assay\",\n      \"journal\": \"Journal of medicinal chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — kinetic characterization of inhibition mode for purified enzyme, single lab\",\n      \"pmids\": [\"16722653\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"In vitro reconstitution of the complete FAS II elongation module of P. falciparum — including ENR (FabI) together with FabB/F, FabG, and FabZ — demonstrated that these four enzymes are sufficient to reconstitute fatty acid chain elongation from butyryl-ACP. Inhibition of ENR by triclosan or NAS-21/91 caused accumulation of the substrate intermediate detectable by MALDI-TOF MS, confirming ENR's role as the terminal reductive step in each elongation cycle.\",\n      \"method\": \"In vitro reconstitution of multienzyme pathway, MALDI-TOF mass spectrometry\",\n      \"journal\": \"Antimicrobial agents and chemotherapy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — biochemical reconstitution with defined substrates and inhibitors, multiple orthogonal readouts\",\n      \"pmids\": [\"17485508\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Novel inhibitor classes (identified by high-throughput screening) inhibit P. falciparum ENR enzyme activity without requiring metabolic activation, and are effective against wild-type and drug-resistant P. falciparum strains. Crystal structure of the M. tuberculosis ENR homolog (InhA) with one inhibitor revealed a unique stoichiometry where either one or two triclosan molecules could bind the active site.\",\n      \"method\": \"High-throughput enzyme inhibition screen, X-ray crystallography (InhA), in vitro parasite growth assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — enzyme activity against PfENR confirmed biochemically, crystal structure is for bacterial homolog not PfENR itself\",\n      \"pmids\": [\"12606558\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"(E)-Oroidin from the marine sponge Agelas oroides is an uncompetitive inhibitor of P. falciparum ENR with Ki values of 0.4 ± 0.2 µM (with respect to substrate) and 0.8 ± 0.2 µM (with respect to cofactor). Delta5,9 fatty acid mixtures also inhibit PfENR with IC50 ≈ 0.35 µg/ml.\",\n      \"method\": \"Activity-guided isolation, enzyme kinetic inhibition studies with purified PfENR\",\n      \"journal\": \"Bioorganic & medicinal chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — kinetic mode of inhibition determined for purified enzyme, single lab, natural product characterization\",\n      \"pmids\": [\"17765547\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Mutation of Ala372 in the substrate-binding loop of P. falciparum ENR to Met (A372M) increased affinity for triclosan approximately twofold and introduced a more hydrophobic environment resembling E. coli ENR. Crystal structure of the A372M mutant confirmed altered active-site contacts. Mutations disrupting a conserved salt bridge that stabilizes the substrate-binding loop caused loss of function, except when an alternative water-bridge network was formed.\",\n      \"method\": \"Site-directed mutagenesis, X-ray crystallography, enzyme kinetics\",\n      \"journal\": \"IUBMB life\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis combined with crystal structure and kinetic measurements in one study\",\n      \"pmids\": [\"21280175\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Steady-state kinetics, pre-steady-state kinetics, and equilibrium fluorescence spectroscopy established the ordered kinetic mechanism of P. falciparum ENR, and showed that a pentacyano(isoniazid)ferrateII inorganic complex inhibits ENR with slow-onset kinetics.\",\n      \"method\": \"Steady-state kinetics, pre-steady-state kinetics, equilibrium fluorescence spectroscopy\",\n      \"journal\": \"Enzyme research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — multiple kinetic methods characterizing enzyme mechanism, single lab, limited by abstract detail\",\n      \"pmids\": [\"21603269\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"X-ray crystal structures of P. falciparum ENR complexed with multiple triclosan variants revealed that substitutions at 4' and 2' positions increase interactions with the protein, cofactor, and solvent. Substitution at the 2' position relocates a conserved water molecule, creating an additional hydrogen bond. Unsubstituted 2'/4' compounds shift position within the hydrophobic pocket to compensate for lost halogen interactions.\",\n      \"method\": \"X-ray crystallography, in vitro parasite culture inhibition assay\",\n      \"journal\": \"IUBMB life\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — crystal structures of multiple enzyme-inhibitor complexes, single lab\",\n      \"pmids\": [\"20503440\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Crystal structures of two coumarin-based triclosan analogs (compounds 7 and 11) in complex with P. falciparum ENR confirmed their binding mode within the active site and validated docking predictions, establishing structure-activity relationships for this inhibitor class.\",\n      \"method\": \"X-ray crystallography of ENR-inhibitor complexes, enzyme inhibition assays\",\n      \"journal\": \"Journal of medicinal chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — crystal structures with functional validation, single lab\",\n      \"pmids\": [\"24063369\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Celastrol was identified as a noncompetitive, low-micromolar inhibitor of P. falciparum ENR in an in vitro activity assay, demonstrating a mode of inhibition distinct from triclosan.\",\n      \"method\": \"Structure-based virtual docking, in vitro enzyme activity assay\",\n      \"journal\": \"Bioorganic & medicinal chemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single enzyme inhibition assay with no structural or mechanistic follow-up, single lab\",\n      \"pmids\": [\"25284249\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"current_model\": \"P. falciparum ENR (PF3D7_0615100) is the NADH-dependent enoyl-ACP reductase of the apicoplast-localized type II fatty acid synthesis pathway, catalyzing the final reductive step of each fatty acid elongation cycle; its crystal structure has been determined in multiple ligand-bound states, its ordered kinetic mechanism and slow-tight-binding inhibition by triclosan (Ki* ~96 pM) have been characterized in vitro, active-site residues critical for inhibitor binding have been defined by mutagenesis, and genetic knockout experiments in P. falciparum and rodent Plasmodium species have established that ENR is dispensable for asexual blood-stage replication but essential for sporozoite development within mosquito oocysts (P. falciparum) and for liver-stage completion and the liver-to-blood transition (P. berghei/yoelii).\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PF3D7_0615100 (ENR) is the NADH-dependent enoyl-ACP reductase of the apicoplast-localized type II fatty acid synthesis (FAS II) pathway in Plasmodium falciparum, catalyzing the terminal reductive step of each fatty acid elongation cycle [#0, #11]. Its role was fixed biochemically by in vitro reconstitution of the complete FAS II elongation module (ENR together with FabB/F, FabG, and FabZ), where inhibition of ENR caused accumulation of the upstream enoyl substrate intermediate, confirming ENR as the enzyme that completes each round of chain elongation [#11]. Kinetically, ENR follows an ordered mechanism, uses NADH as reductant and enoyl-CoA/ACP substrates (Km values of 165 \\u00b5M for crotonyl-CoA and 33 \\u00b5M for NADH), and is inhibited by triclosan through a slow-tight-binding two-step mechanism (Ki = 53 nM, Ki* \\u2248 96 pM) that is competitive with NADH and facilitated by NAD+ [#1, #3, #15]. Crystal structures in binary (NADH) and ternary (triclosan/NAD+) states, combined with active-site mutagenesis, define the drug-binding pocket and identify residues Ala-217, Asn-218, Met-281, Phe-368 and the substrate-binding-loop residue Ala-372 as determinants of inhibitor binding and enzyme function [#2, #4, #14]. Genetic knockout established that ENR is dispensable for asexual blood-stage replication but stage-specifically essential: FabI-deficient parasites fail in liver-stage development and the liver-to-blood transition in rodent Plasmodium (P. berghei/P. yoelii), whereas in P. falciparum deletion abolishes sporozoite development within mosquito midgut oocysts [#7, #8, #9]. ENR protein localizes to the apicoplast of oocyst, sporozoite, and liver stages, colocalizing with acyl carrier protein [#8, #9].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Establishing that Plasmodium possesses a druggable de novo FAS II pathway required demonstrating that a specific enzyme, ENR, catalyzes fatty acid synthesis and can be pharmacologically blocked.\",\n      \"evidence\": \"Enzyme purification and [14C]acetate/[14C]malonyl-CoA fatty acid labeling with triclosan inhibition in P. falciparum\",\n      \"pmids\": [\"11175846\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve the precise chemical step catalyzed within the elongation cycle\", \"Did not define kinetic parameters or cofactor preference\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defining the cofactor dependence and inhibition logic clarified how triclosan engages ENR, showing NAD+ facilitates inhibitor binding and NADH competes with it.\",\n      \"evidence\": \"Recombinant expression in E. coli and steady-state kinetics of purified P. falciparum ENR\",\n      \"pmids\": [\"11735121\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinetics used crotonyl-CoA rather than physiological enoyl-ACP substrate\", \"Two kinetic parameters only; full mechanism not resolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Solving the ENR crystal structure in ligand-bound states provided the structural basis for cofactor and inhibitor binding and its apicoplast targeting prediction.\",\n      \"evidence\": \"X-ray crystallography of binary NADH and ternary triclosan/NAD+ complexes of P. falciparum ENR\",\n      \"pmids\": [\"11792710\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural prediction of apicoplast localization not yet experimentally confirmed\", \"Substrate (enoyl-ACP) complex not captured\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Characterizing triclosan as a slow-tight-binding inhibitor and mapping the residues that control its binding explained the exceptional potency and defined the drug-binding pocket.\",\n      \"evidence\": \"Steady-state kinetics, fluorescence, SPR, and active-site site-directed mutagenesis of P. falciparum ENR\",\n      \"pmids\": [\"15086316\", \"15139852\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether these residues also govern natural substrate turnover not fully separated from inhibitor binding\", \"Mutant enzyme stability/catalytic effects not exhaustively profiled\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Reconstituting the four-enzyme FAS II elongation module in vitro placed ENR mechanistically as the terminal reductive step of each elongation cycle.\",\n      \"evidence\": \"In vitro multienzyme reconstitution from butyryl-ACP with MALDI-TOF detection of intermediate accumulation upon ENR inhibition, P. falciparum enzymes\",\n      \"pmids\": [\"17485508\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological chain-length products and in vivo flux not quantified\", \"Interplay with acyl carrier protein handoff not structurally resolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Comparative structures and expanded inhibitor complexes refined the active-site pocket and explained species-selective inhibitor affinity within apicomplexan ENRs.\",\n      \"evidence\": \"X-ray crystallography of ENR-inhibitor complexes plus enzyme and parasite growth inhibition, with comparison to T. gondii ENR\",\n      \"pmids\": [\"17567585\", \"17327670\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural insights not yet translated to whole-parasite efficacy against relevant stages\", \"Selectivity over human targets not addressed here\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Genetic knockout resolved when ENR is actually required, showing it is dispensable in blood stages but essential for liver-stage development and the liver-to-blood transition in rodent malaria.\",\n      \"evidence\": \"Targeted fabI deletion in P. falciparum and P. berghei/P. yoelii, apicoplast colocalization, and mouse liver-stage infection assays\",\n      \"pmids\": [\"19064257\", \"19068099\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not explain why blood stages tolerate loss (fatty acid scavenging vs synthesis)\", \"Molecular cause of merosome/merozoite formation failure not defined\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}, {\"species\": \"Plasmodium berghei\", \"strain\": \"\"}, {\"species\": \"Plasmodium yoelii\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Stage-specific expression and knockout in P. falciparum revealed a species divergence: ENR is required for sporozoite development within mosquito oocysts, distinct from the liver-stage requirement in rodent models.\",\n      \"evidence\": \"Immunofluorescence with anti-FabI antibodies, ACP colocalization, and targeted fabI deletion with mosquito-stage development assays in P. falciparum\",\n      \"pmids\": [\"24297444\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanistic basis for the oocyst-versus-liver-stage requirement difference across species unresolved\", \"Downstream lipid products required at each stage not identified\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Full kinetic dissection established the ordered mechanism of ENR and extended slow-onset inhibition to additional chemotypes, while mutagenesis linked the substrate-binding loop and a conserved salt bridge to catalytic function.\",\n      \"evidence\": \"Steady-state/pre-steady-state kinetics, fluorescence, and A372M mutagenesis with crystallography of P. falciparum ENR\",\n      \"pmids\": [\"21603269\", \"21280175\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Rate-limiting step and full microscopic rate constants not comprehensively reported\", \"Functional consequence of loop dynamics in vivo untested\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Diverse inhibitor chemotypes and structure-activity studies mapped how the ENR active site accommodates and can be tuned toward alternative scaffolds.\",\n      \"evidence\": \"Enzyme inhibition kinetics, natural-product isolation, HTS, virtual docking, and crystallography of P. falciparum ENR-inhibitor complexes (triclosan analogs, coumarins, flavonoids, oroidin, celastrol)\",\n      \"pmids\": [\"16722653\", \"12606558\", \"17765547\", \"20503440\", \"24063369\", \"25284249\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Several inhibitor modes rest on single-lab enzyme assays without structural follow-up (e.g. celastrol)\", \"Whole-parasite and stage-specific efficacy of most chemotypes not established\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved why blood-stage parasites tolerate loss of ENR while transmission and liver stages depend on it, and what specific lipid products of FAS II are required at each essential stage.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Fatty acid products downstream of ENR not linked to a stage-specific requirement\", \"Balance between de novo synthesis and host lipid scavenging across stages not defined\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0004318\", \"supporting_discovery_ids\": [0, 1, 11, 15]},\n      {\"term_id\": \"GO:0070402\", \"supporting_discovery_ids\": [1, 3, 15]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0020011\", \"supporting_discovery_ids\": [2, 8, 9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0006633\", \"supporting_discovery_ids\": [0, 11]}\n    ],\n    \"complexes\": [\n      \"FAS II elongation module (ENR/FabI with FabB/F, FabG, FabZ) reconstituted in vitro [#11]\"\n    ],\n    \"partners\": [\n      \"acyl carrier protein (ACP) — apicoplast colocalization marker [#8, #9]\",\n      \"FabB/F, FabG, FabZ — co-functional FAS II elongation enzymes [#11]\"\n    ],\n    \"other_free_text\": [\n      \"NADH-dependent, ordered kinetic mechanism; Km crotonyl-CoA 165 \\u00b5M, Km NADH 33 \\u00b5M [#1, #15]\",\n      \"Triclosan is a slow-tight-binding inhibitor (Ki 53 nM, Ki* ~96 pM), competitive with NADH and facilitated by NAD+ [#1, #3]\",\n      \"Active-site/inhibitor-binding residues: Ala-217, Asn-218, Met-281, Phe-368; substrate-binding-loop residue Ala-372 and a conserved salt bridge govern function [#4, #14]\",\n      \"Dispensable for asexual blood-stage replication; essential for P. falciparum oocyst sporozoite development and for rodent Plasmodium liver-stage completion / liver-to-blood transition [#7, #8, #9]\"\n    ]\n  }\n}","audit_flag":null,"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_0615100","name":null,"product":"enoyl-acyl carrier reductase","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PbANKA","gene_id":"PBANKA_1229800","name":null,"product":"enoyl-acyl carrier reductase","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_1134900","name":null,"product":"enoyl-acyl carrier reductase, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"ENR","evaluation":null}