{"gene":"PF3D7_0923800","run_date":"2026-09-08T12:51:27","timeline":{"discoveries":[{"year":1997,"finding":"Site-directed mutagenesis of P. falciparum TRXR identified Cys88 and Cys93 as the essential redox-active disulfide (mutation to Ala or Ser caused total loss of enzymatic activity), and His509 as the active-site base (mutation to Gln or Ala caused 95–97% loss of activity). Spectral analysis revealed a 550-nm absorption band upon reduction, characteristic of the EH2 form seen in glutathione reductase and lipoamide dehydrogenase, confirming TRXR belongs to the large (high-Mr) class of TrxRs.","method":"Site-directed mutagenesis, steady-state kinetic analysis, spectral analysis of recombinant protein expressed in E. coli","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — active-site mutagenesis with full kinetic characterization plus spectral validation, multiple mutants tested","pmids":["9368022"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1998,"finding":"The C-terminal cysteines Cys535 and Cys540 of P. falciparum TRXR are crucially involved in thioredoxin reduction. Single mutants (C535A, C540A), double mutant (C535A/C540A), and a 9-amino-acid C-terminal deletion mutant all lost thioredoxin reductase activity while retaining reactivity with DTNB, indicating the C-terminal cysteine pair is required for substrate coordination and/or electron transfer to thioredoxin rather than for FAD-proximal redox chemistry.","method":"Site-directed mutagenesis (single, double, deletion mutants), DTNB reactivity assay, thioredoxin reductase activity assay","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple complementary mutants with functional assays, replicated finding consistent with PMID 10074374","pmids":["9563503"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1999,"finding":"Reductive titrations of C535A and C540A single-mutant TRXR enzymes modified with DTNB to form C-terminal mixed disulfides showed that each C-terminal cysteine, when presented as a TNB mixed disulfide mimicking the proposed disulfide acceptor, is reduced at a rate comparable to the wild-type turnover number. This directly demonstrates that the C-terminal cysteines participate as electron acceptors in catalysis via intramolecular dithiol-disulfide interchange with the nascent N-terminal dithiol.","method":"Reductive titrations of mixed-disulfide enzyme variants, stopped-flow rapid kinetics, spectrophotometric TNB release assay","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with chemical modification and rapid kinetics, mechanistic validation of C-terminal redox center","pmids":["10074374"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2000,"finding":"Co-expression of differentially tagged wild-type and mutant TRXR subunits in E. coli demonstrated that the enzyme forms head-to-tail homodimers with intersubunit active sites: co-expression of the double mutant PfTrxRC88AC535A with wild-type yielded an inactive heterodimer, showing that each active site spans both subunits (N-terminal Cys88/Cys93 from one subunit, C-terminal Cys535/Cys540 from the other). Data also implied cooperative interaction between the two active sites.","method":"Co-expression of tagged wild-type and mutant proteins in E. coli, affinity chromatography purification of heterodimers, activity assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct biochemical reconstitution of heterodimers with functional readout, multiple mutant combinations tested","pmids":["11022050"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2000,"finding":"Recombinant P. falciparum TRXR (PfTrxR) was stably expressed by silent mutagenesis and biochemically characterized. P. falciparum thioredoxin (PfTrx) is a substrate for TRXR with Km = 10.4 µM and kcat = 3100 min⁻¹; notably PfTrx is a better substrate for human TrxR (Km = 2 µM, kcat = 3300 min⁻¹). Reduced PfTrx was shown to reduce GSSG with a rate constant k2 = 0.039 µM⁻¹ min⁻¹, approximately 5-fold higher than thioredoxins from human, Drosophila, or E. coli, suggesting that the TRXR/Trx system can support GSSG reduction in glutathione reductase-deficient conditions.","method":"Recombinant protein expression (silent mutagenesis), steady-state kinetics, coupled enzyme assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro enzymatic characterization with defined substrates, kinetic constants determined, single lab","pmids":["11013257"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2001,"finding":"Steady-state kinetic analyses with recombinant TRXR and its natural substrate PfTrx gave Km values of 0.8–2.1 µM for PfTrx, approximately 250-fold lower than for the model substrate E. coli thioredoxin; with similar kcat values this represents ≥250-fold higher catalytic efficiency for the cognate substrate.","method":"Recombinant protein expression, steady-state kinetics in coupled assay systems","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro kinetic characterization, single lab, single study","pmids":["11223129"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2002,"finding":"Gene knockout attempts showed it was impossible to generate P. falciparum parasites with a disrupted trxR gene, establishing that TRXR is essential for erythrocytic stage survival. Co-transfection with a knockout construct plus a trxR coding sequence under the calmodulin promoter rescued viability despite disruption of the endogenous locus; co-transfectants were viable and overexpressed TRXR as confirmed by Northern and Western blot. PFGE and FIGE confirmed targeting was confined to chromosome 9 trxR locus.","method":"Gene knockout by homologous recombination, co-transfection rescue experiment, Southern blot, PFGE/FIGE, Northern blot, Western blot","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic essentiality established by failed knockout plus complementation rescue, multiple orthogonal molecular verification methods","pmids":["12004069"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2003,"finding":"Ferriprotoporphyrin IX (FP/hemin) inhibits P. falciparum TRXR with a Ki of 1 µM, identified by enzyme activity assay with FP-immobilized agarose pull-down and kinetic analysis, indicating TRXR is a heme-interacting protein susceptible to inhibition by toxic heme released during hemoglobin degradation.","method":"FP-agarose pull-down, enzyme activity inhibition assay (Ki determination)","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct biochemical inhibition assay with defined Ki, single lab, single study","pmids":["12748176"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2003,"finding":"Mannich bases act as mechanism-based (bisalkylating) inhibitors of P. falciparum TRXR. Mechanistic studies showed that the C-terminal Cys535'/Cys540' pair—not the N-terminal Cys88/Cys93 pair—is the site of alkylation; alkylated TRXR loses thioredoxin reductase activity but retains ability to reduce low-Mr electron acceptors via the unmodified N-terminal thiols. The charge-transfer complex between Cys88 thiolate and FAD was used spectroscopically to monitor N-terminal thiol status.","method":"Mechanism-based inhibitor synthesis, thiol conjugation model studies, spectrophotometric charge-transfer complex monitoring, enzyme activity assays with defined substrates","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — detailed mechanistic dissection using multiple orthogonal chemical and spectral methods, site-specific modification confirmed","pmids":["14609342"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2006,"finding":"Steady-state kinetics, anaerobic static titrations, and rapid kinetics of wild-type TRXR and His509Gln / Glu514Ala variants established that the His509-Glu514 dyad acts as the acid-base catalyst. His509Gln retained only 0.5% wild-type activity with severely reduced rate constants in both reductive and oxidative half-reactions and no thiolate-flavin charge-transfer complex. Glu514Ala retained 7% activity and was shown to be involved in dithiol-disulfide interchange between the Cys88/Cys93 and Cys535/Cys540 pairs; Glu514 greatly enhances His509's catalytic role.","method":"Site-directed mutagenesis, steady-state kinetics, anaerobic spectral titrations, stopped-flow rapid kinetics","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal methods (steady-state, rapid kinetics, spectral) on multiple mutants, mechanistic details resolved","pmids":["16950793"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2006,"finding":"Three Mannich-base-derived compounds showed selective uncompetitive inhibition of P. falciparum TRXR relative to human TrxR (IC50 values 0.5–2 µM for PfTrxR vs. 4–140 µM for hTrxR). Mechanistic characterization of the most specific inhibitor (compound 7) via thiol conjugation model demonstrated alkylation mechanism. All three compounds showed antiplasmodial activity against chloroquine-resistant K1 strain.","method":"Enzyme inhibition assays (IC50, kinetic mode determination), thiol conjugation model for mechanism, in vitro antiplasmodial assay","journal":"Bioorganic & medicinal chemistry letters","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro enzymatic inhibition with mechanistic follow-up, single lab, single study","pmids":["16458512"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2010,"finding":"Alternative translation initiation (ATI) is used by P. falciparum to achieve dual subcellular localization of TRXR: the enzyme is targeted to both the cytosol and an additional compartment through use of an alternative start codon, as determined by systematic subcellular localization mapping of redox proteins.","method":"Subcellular localization mapping of antioxidant/redox proteins by systematic study including GFP fusions and fractionation","journal":"PLoS pathogens","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct localization experiment with mechanistic implication (ATI-mediated dual targeting), single lab, single study","pmids":["21203490"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2010,"finding":"In P. berghei, thioredoxin reductase gene was successfully disrupted by gene targeting, demonstrating that TRXR (the P. berghei ortholog) is dispensable for blood-stage proliferation and for the entire parasite life cycle, in contrast to the essential role shown in P. falciparum. Glutathione reductase, but not TRXR, was found essential for extracellular development in the insect vector.","method":"Gene targeting/knockout in P. berghei, phenotypic analysis across life cycle stages","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean genetic knockout with life-cycle-wide phenotypic analysis, contrasts P. falciparum essentiality result","pmids":["20852334"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2011,"finding":"P. falciparum TRXR was identified as a target of protein S-glutathionylation in a proteomic screen of the Plasmodium glutathionylome, using enzymatic deglutathionylation, biotin-maleimide affinity purification, and mass spectrometry. This establishes TRXR as a potential redox-regulated target of this post-translational modification in the parasite.","method":"Enzymatic deglutathionylation, affinity purification of biotin-maleimide-tagged proteins, proteomic MS identification","journal":"Antioxidants & redox signaling","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — proteomic identification of glutathionylation target using affinity-based method, single lab, identification only (no functional consequence for TRXR specifically demonstrated)","pmids":["21595565"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2012,"finding":"Crystal structure of recombinant P. falciparum TRXR was solved at 2.9 Å resolution, revealing that the dimer interface differs substantially from human TrxR and offers a selective binding site for non-competitive inhibitors. The Plasmodium-specific dimer interface architecture is conserved among Plasmodium species but absent in other Apicomplexa and mammals.","method":"X-ray crystallography (2.9 Å resolution) of recombinant PfTrxR","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure at defined resolution with functional implications for inhibitor selectivity, single lab","pmids":["22889878"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2013,"finding":"Crystal structure of the P. falciparum TRXR–thioredoxin 1 complex was solved, revealing that the flexible C-terminal arm and a Plasmodium-specific insertion loop of TRXR are rearranged upon complex formation, suggesting the C-terminal arm undergoes conformational change during catalysis. Key differences from human TrxR in thioredoxin binding mode and the C-terminal arm conformation were identified. Cell biological experiments confirmed that specific TRXR inhibitors with antimalarial activity act on the parasite enzyme in vivo.","method":"X-ray crystallography of TrxR–Trx complex, structure-guided mutagenesis of substrate-binding and intersubunit-cavity residues, cell biological assays with specific inhibitors","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — co-crystal structure plus functional mutagenesis plus cell-biological validation, multiple orthogonal methods in one study","pmids":["23845423"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2014,"finding":"Semisynthesis and site-directed mutagenesis of the C-terminal redox motif (G534CGGGKCG541, type II) of P. falciparum TRXR established: (i) deletion of Gly541 reduces activity ~50-fold by disrupting a stabilizing hydrogen bond in the β-turn-β motif; (ii) alterations of the 20-membered disulfide ring by deletion or substitution impair catalysis; (iii) replacement of Cys with homocysteine (semisynthesis) reduced activity by disrupting ring geometry; (iv) a chimeric TRXR bearing the type I GCCG sequence had 500-fold less activity, while the GCUG (selenocysteine) chimera had higher activity, supporting an 'electrophilic activation' mechanism for the native Cys-based type II center.","method":"Site-directed mutagenesis, protein semisynthesis (incorporation of selenocysteine and homocysteine), steady-state kinetic assays with cognate and non-cognate substrates","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — protein semisynthesis plus mutagenesis with rigorous kinetics, multiple mechanistic conclusions, single lab but multiple orthogonal approaches","pmids":["24400600"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2018,"finding":"Using the 'seleno effect' approach (Sec substitution for Cys), it was established that Cys535 acts as an electrophile/leaving group (C535U substitution decreased activity ~9-fold) while Cys540 acts as the nucleophile attacking the N-terminal dithiol (C540U substitution increased activity ~1.5-fold) in the thiol-disulfide exchange step between the N-terminal and C-terminal redox centers of P. falciparum TRXR. Full-length semisynthetic enzymes confirmed these roles.","method":"Protein semisynthesis (selenocysteine substitution at individual C-terminal residues), activity assays with truncated and full-length semisynthetic enzymes","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — protein semisynthesis with functional readout differentiating electrophilic vs. nucleophilic roles of individual cysteines, single lab, multiple enzyme forms tested","pmids":["29485860"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2017,"finding":"The glutathione system (via glutaredoxin) can reduce thioredoxin-like protein 1 and thioredoxin 2, which are either poor substrates for TRXR or lack access to TRXR, providing functional complementation between the two redox systems. This cross-talk was demonstrated biochemically, placing TRXR within a broader redox network where its substrate specificity limits access to certain thioredoxin isoforms.","method":"In vitro biochemical cross-reactivity assays between glutathione system components and thioredoxin isoforms, activity measurements","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct biochemical assay establishing cross-talk, single lab, positions TRXR by substrate specificity within network","pmids":["28479253"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"current_model":"P. falciparum TRXR (PF3D7_0923800) is an essential homodimeric high-Mr flavoenzyme that transfers electrons from NADPH via FAD to an N-terminal Cys88/Cys93 disulfide, then via His509-Glu514 acid-base catalysis to a distinctive 20-membered C-terminal Cys535/Cys540 disulfide ring on the opposite subunit (intersubunit active site), which in turn reduces the cognate substrate thioredoxin 1; the C-terminal arm undergoes conformational rearrangement upon thioredoxin binding, a Plasmodium-specific insertion loop and dimer interface differentiate the enzyme from human TrxR, dual localization is achieved by alternative translation initiation, and while genetically essential in P. falciparum blood stages, the P. berghei ortholog is dispensable throughout the life cycle."},"narrative":{"mechanistic_narrative":"PF3D7_0923800 (TRXR) is a high-Mr flavoenzyme thioredoxin reductase that constitutes the terminal electron-donating step of the P. falciparum thioredoxin redox system, and it is essential for erythrocytic-stage survival [PMID:9368022, PMID:12004069]. Catalysis proceeds by electron transfer from NADPH through FAD to an N-terminal redox-active Cys88/Cys93 disulfide, with His509 serving as the active-site base whose function is enhanced by Glu514 acting as an acid-base dyad [PMID:9368022, PMID:16950793]. Electrons are then relayed to the C-terminal Cys535/Cys540 pair, which forms a 20-membered type II disulfide ring required specifically for reduction of the physiological substrate thioredoxin rather than for FAD-proximal chemistry [PMID:9563503, PMID:24400600]; within this ring, Cys535 acts as the electrophile/leaving group and Cys540 as the attacking nucleophile in the intramolecular dithiol-disulfide interchange [PMID:29485860]. The enzyme is a head-to-tail homodimer with intersubunit active sites, such that the N-terminal cysteines of one subunit pair with the C-terminal cysteines of the opposite subunit [PMID:11022050]. TRXR reduces its cognate P. falciparum thioredoxin with high catalytic efficiency and marked substrate preference over model thioredoxins [PMID:11013257, PMID:11223129], and crystal structures of the free enzyme and of the TRXR–thioredoxin 1 complex reveal a Plasmodium-specific dimer interface and a flexible C-terminal arm plus insertion loop that rearrange upon substrate binding, features that distinguish it from human TrxR and provide selective inhibitor-binding surfaces [PMID:22889878, PMID:23845423]. These structural and mechanistic distinctions underlie its validation as an antimalarial drug target, with Mannich-base mechanism-based inhibitors that alkylate the C-terminal cysteine pair and act selectively on the parasite enzyme in vivo [PMID:14609342, PMID:16458512, PMID:23845423]. The enzyme is dually localized to the cytosol and a second compartment via alternative translation initiation [PMID:21203490]. In P. berghei, the TRXR ortholog is dispensable throughout the life cycle, in contrast to its essentiality in P. falciparum blood stages [PMID:20852334].","teleology":[{"year":1997,"claim":"Establishing which residues perform the core redox chemistry was needed to place TRXR mechanistically; mutagenesis identified the N-terminal disulfide and active-site base and assigned the enzyme to the high-Mr TrxR class.","evidence":"Site-directed mutagenesis, steady-state kinetics, and spectral analysis of recombinant enzyme from E. coli","pmids":["9368022"],"confidence":"High","gaps":["Did not define how electrons reach the physiological substrate thioredoxin","No structural basis for the EH2 form"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1998,"claim":"Because the N-terminal disulfide alone could not explain thioredoxin reduction, the C-terminal cysteines were tested and found specifically required for electron transfer to thioredoxin but not for low-Mr acceptor chemistry.","evidence":"Single, double, and deletion mutants assayed for DTNB reactivity versus thioredoxin reductase activity","pmids":["9563503"],"confidence":"High","gaps":["Did not directly demonstrate the C-terminal cysteines act as kinetically competent electron acceptors","Did not assign individual roles to Cys535 vs Cys540"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1999,"claim":"To prove the C-terminal cysteines are true catalytic intermediates rather than merely required, mixed-disulfide variants were reduced at wild-type-comparable rates, confirming an intramolecular dithiol-disulfide interchange relay.","evidence":"Reductive titrations of DTNB-modified C535A/C540A variants with stopped-flow rapid kinetics","pmids":["10074374"],"confidence":"High","gaps":["Individual electrophile/nucleophile roles of the two cysteines remained undefined","Intersubunit geometry not yet established"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2000,"claim":"The spatial organization of the two redox centers was unknown; co-expression of complementary mutants showed the enzyme is a head-to-tail homodimer with active sites spanning both subunits.","evidence":"Co-expression of differentially tagged wild-type and mutant subunits in E. coli, heterodimer purification, and activity assays","pmids":["11022050"],"confidence":"High","gaps":["Cooperativity between active sites was implied but not fully quantified","No atomic structure of the dimer interface at this stage"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2001,"claim":"Defining the physiological substrate specificity clarified TRXR's cellular role; kinetics with the cognate PfTrx showed markedly higher catalytic efficiency and lower Km than for model thioredoxins.","evidence":"Recombinant enzyme steady-state kinetics comparing cognate PfTrx and E. coli thioredoxin in coupled assays (with earlier characterization in 11013257)","pmids":["11223129","11013257"],"confidence":"Medium","gaps":["Substrate preference measured in vitro only, single lab","Did not address which cellular thioredoxin pools are accessible in vivo"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2002,"claim":"Whether TRXR is required for parasite survival determined its drug-target value; failed knockout with complementation rescue established essentiality in erythrocytic stages.","evidence":"Gene knockout by homologous recombination, co-transfection rescue, and multiple molecular verifications in P. falciparum","pmids":["12004069"],"confidence":"High","gaps":["Essentiality shown for blood stage only","Which downstream redox function is limiting for survival not defined"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2006,"claim":"The chemical basis of catalysis was refined by showing His509 acts with Glu514 as an acid-base dyad driving both half-reactions and the dithiol-disulfide interchange.","evidence":"Site-directed mutagenesis of His509Gln and Glu514Ala with steady-state and stopped-flow kinetics and anaerobic spectral titrations","pmids":["16950793"],"confidence":"High","gaps":["Precise protonation states during turnover not directly observed","Structural context of the dyad not yet crystallographically resolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2003,"claim":"Testing druggability, heme and Mannich-base compounds were shown to inhibit TRXR, with Mannich bases alkylating specifically the C-terminal cysteine pair as mechanism-based inhibitors.","evidence":"FP-agarose pull-down and Ki determination for hemin; mechanism-based inhibitor studies with thiol-conjugation models and charge-transfer monitoring","pmids":["12748176","14609342"],"confidence":"High","gaps":["Cellular relevance of heme inhibition not established in these studies","Selectivity over human TrxR not yet quantified"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2006,"claim":"Selective inhibition over the human enzyme was required for therapeutic value; Mannich-base derivatives showed uncompetitive, parasite-selective inhibition and antiplasmodial activity.","evidence":"Enzyme inhibition IC50/mode determination for PfTrxR versus hTrxR and antiplasmodial assay against K1 strain","pmids":["16458512"],"confidence":"Medium","gaps":["Target engagement in vivo not yet demonstrated","Single lab, single study"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2010,"claim":"The subcellular distribution and organismal requirement were addressed: dual cytosolic/second-compartment localization arises via alternative translation initiation, and the P. berghei ortholog is dispensable across the life cycle.","evidence":"Systematic localization mapping (GFP fusions/fractionation) in P. falciparum; gene targeting and life-cycle phenotyping in P. berghei","pmids":["21203490","20852334"],"confidence":"Medium","gaps":["The additional non-cytosolic compartment is not precisely identified","Basis for the P. falciparum/P. berghei essentiality divergence unexplained"],"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium berghei","strain":""}]},{"year":2011,"claim":"Post-translational regulation was explored; TRXR was identified as an S-glutathionylation target in the parasite glutathionylome.","evidence":"Enzymatic deglutathionylation, biotin-maleimide affinity purification, and proteomic MS in P. falciparum","pmids":["21595565"],"confidence":"Medium","gaps":["Functional consequence of glutathionylation for TRXR activity not demonstrated","Modified residues not mapped"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2012,"claim":"A structural basis for selective inhibition was needed; the crystal structure revealed a Plasmodium-specific dimer interface offering a non-competitive inhibitor-binding site absent in human and other apicomplexan enzymes.","evidence":"X-ray crystallography of recombinant PfTrxR at 2.9 Å","pmids":["22889878"],"confidence":"High","gaps":["Substrate-bound conformation not resolved in this structure","Inhibitor complexes at the interface not directly captured"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2013,"claim":"How TRXR engages its substrate was resolved by the co-crystal structure, showing the flexible C-terminal arm and Plasmodium-specific insertion loop rearrange on thioredoxin binding, with inhibitors validated to act on the enzyme in vivo.","evidence":"X-ray crystallography of the TrxR–Trx1 complex, structure-guided mutagenesis, and cell-biological inhibitor assays","pmids":["23845423"],"confidence":"High","gaps":["Full catalytic-cycle conformational dynamics not directly visualized","Mechanism of the second-compartment role not addressed"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2014,"claim":"The chemical logic of the unusual C-terminal redox center was dissected, showing the 20-membered type II disulfide ring geometry and Gly541 hydrogen bond are essential and that the native Cys-based center operates via electrophilic activation.","evidence":"Protein semisynthesis (Sec, homocysteine incorporation) and mutagenesis with kinetics on cognate and non-cognate substrates","pmids":["24400600"],"confidence":"High","gaps":["Individual redox roles of Cys535 vs Cys540 not yet separated","Ring dynamics during catalysis inferred, not observed"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2018,"claim":"The individual catalytic roles within the C-terminal ring were finally assigned: Cys535 is the electrophile/leaving group and Cys540 the nucleophile in the interchange with the N-terminal dithiol.","evidence":"Selenocysteine 'seleno effect' substitution at individual C-terminal residues in truncated and full-length semisynthetic enzymes","pmids":["29485860"],"confidence":"High","gaps":["Transition-state structure not directly determined","Contribution of the intersubunit geometry to these roles not isolated"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2017,"claim":"TRXR's place in the wider redox network was defined by substrate accessibility, showing certain thioredoxin isoforms are poor TRXR substrates and are instead served by the glutathione/glutaredoxin system.","evidence":"In vitro cross-reactivity and activity assays between glutathione-system components and thioredoxin isoforms","pmids":["28479253"],"confidence":"Medium","gaps":["Physiological significance of the complementation in vivo not established","Compartment-specific access not tested"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":null,"claim":"It remains unresolved why TRXR is essential in P. falciparum but dispensable in P. berghei, what the second (non-cytosolic) localization compartment is and what TRXR does there, and whether S-glutathionylation functionally regulates the enzyme.","evidence":"","pmids":[],"confidence":"Medium","gaps":["Species divergence in essentiality unexplained","Identity and function of the second localization compartment unknown","Functional impact of glutathionylation undetermined"],"attribution":[]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":["Homodimer with intersubunit active sites (head-to-tail arrangement) [#3, #14]","TRXR–thioredoxin 1 substrate complex [#15]"],"partners":["P. FALCIPARUM THIOREDOXIN 1 (COGNATE SUBSTRATE) [#4, #5, #15]","FERRIPROTOPORPHYRIN IX / HEMIN (INHIBITOR, KI ~1 ΜM) [#7]"],"other_free_text":["N-terminal redox-active Cys88/Cys93 disulfide and His509–Glu514 acid-base dyad perform FAD-proximal chemistry [#0, #9]","C-terminal 20-membered type II disulfide ring (G534CGGGKCG541) with Cys535 electrophile and Cys540 nucleophile transfers electrons to thioredoxin [#16, #17]","Essential in P. falciparum blood stages but dispensable in P. berghei across the life cycle [#6, #12]","Dual localization via alternative translation initiation [#11]","Target of S-glutathionylation in the parasite glutathionylome [#13]","Mannich-base compounds are mechanism-based, parasite-selective inhibitors alkylating the C-terminal cysteine pair [#8, #10, #15]","Plasmodium-specific dimer interface and rearranging C-terminal arm/insertion loop distinguish it from human TrxR [#14, #15]"]}},"prefetch_data":{},"corpus_meta":[{"pmid":"11012663","id":"PMC_11012663","title":"Thioredoxin reductase as a pathophysiological factor and drug target.","date":"2000","source":"European journal of biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11012663","citation_count":289,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["TRXR","thioredoxin reductase"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"11012662","id":"PMC_11012662","title":"Thioredoxin reductase two modes of catalysis have evolved.","date":"2000","source":"European journal of biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11012662","citation_count":266,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["thioredoxin reductase"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"15387810","id":"PMC_15387810","title":"Redox and antioxidant systems of the malaria parasite Plasmodium falciparum.","date":"2004","source":"Molecular microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/15387810","citation_count":242,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["thioredoxin reductase"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"11013257","id":"PMC_11013257","title":"The thioredoxin system of the malaria parasite Plasmodium falciparum. 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Reductase.","date":"2018","source":"Biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/29485860","citation_count":8,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["thioredoxin reductase"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"30052295","id":"PMC_30052295","title":"Gain of function conferred by selenocysteine: catalytic enhancement of one-electron transfer reactions by thioredoxin reductase.","date":"2018","source":"Protein science : a publication of the Protein Society","url":"https://pubmed.ncbi.nlm.nih.gov/30052295","citation_count":7,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["thioredoxin reductase"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"24209891","id":"PMC_24209891","title":"Characterization of PfTrxR inhibitors using antimalarial assays and in silico techniques.","date":"2013","source":"Chemistry Central journal","url":"https://pubmed.ncbi.nlm.nih.gov/24209891","citation_count":7,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["thioredoxin reductase"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"22847705","id":"PMC_22847705","title":"Development of liquid chromatography/mass spectrometry based screening assay for PfTrxR inhibitors using relative quantitation of intact thioredoxin.","date":"2012","source":"Rapid communications in mass spectrometry : RCM","url":"https://pubmed.ncbi.nlm.nih.gov/22847705","citation_count":5,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["TRXR","thioredoxin reductase"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"25879664","id":"PMC_25879664","title":"Effects of cyclin-dependent kinase inhibitor Purvalanol B application on protein expression and developmental progression in intra-erythrocytic Plasmodium falciparum parasites.","date":"2015","source":"Malaria journal","url":"https://pubmed.ncbi.nlm.nih.gov/25879664","citation_count":5,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["thioredoxin reductase"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"24079187","id":"PMC_24079187","title":"Determination of antiplasmodial activity and binding affinity of selected natural products towards PfTrxR and PfGR.","date":"2013","source":"Natural product communications","url":"https://pubmed.ncbi.nlm.nih.gov/24079187","citation_count":4,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["TRXR"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"42352277","id":"PMC_42352277","title":"Free Radical Formation in the Reactions of Redox-Active Drugs and Xenobiotics with Mitochondrial Flavoenzymes.","date":"2026","source":"Biomolecules","url":"https://pubmed.ncbi.nlm.nih.gov/42352277","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["thioredoxin reductase"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":34128,"output_tokens":5870,"usd":0.095217,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":12818,"output_tokens":5961,"usd":0.106557,"stage2_stop_reason":"end_turn"},"total_usd":0.201774,"stage1_batch_id":"msgbatch_01DisAaTypwmC8QwdMBuePHo","stage2_batch_id":"msgbatch_0184zxZTqxiEfdYYfPMfkqjb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1997,\n      \"finding\": \"Site-directed mutagenesis of P. falciparum TRXR identified Cys88 and Cys93 as the essential redox-active disulfide (mutation to Ala or Ser caused total loss of enzymatic activity), and His509 as the active-site base (mutation to Gln or Ala caused 95–97% loss of activity). Spectral analysis revealed a 550-nm absorption band upon reduction, characteristic of the EH2 form seen in glutathione reductase and lipoamide dehydrogenase, confirming TRXR belongs to the large (high-Mr) class of TrxRs.\",\n      \"method\": \"Site-directed mutagenesis, steady-state kinetic analysis, spectral analysis of recombinant protein expressed in E. coli\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — active-site mutagenesis with full kinetic characterization plus spectral validation, multiple mutants tested\",\n      \"pmids\": [\"9368022\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The C-terminal cysteines Cys535 and Cys540 of P. falciparum TRXR are crucially involved in thioredoxin reduction. Single mutants (C535A, C540A), double mutant (C535A/C540A), and a 9-amino-acid C-terminal deletion mutant all lost thioredoxin reductase activity while retaining reactivity with DTNB, indicating the C-terminal cysteine pair is required for substrate coordination and/or electron transfer to thioredoxin rather than for FAD-proximal redox chemistry.\",\n      \"method\": \"Site-directed mutagenesis (single, double, deletion mutants), DTNB reactivity assay, thioredoxin reductase activity assay\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple complementary mutants with functional assays, replicated finding consistent with PMID 10074374\",\n      \"pmids\": [\"9563503\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Reductive titrations of C535A and C540A single-mutant TRXR enzymes modified with DTNB to form C-terminal mixed disulfides showed that each C-terminal cysteine, when presented as a TNB mixed disulfide mimicking the proposed disulfide acceptor, is reduced at a rate comparable to the wild-type turnover number. This directly demonstrates that the C-terminal cysteines participate as electron acceptors in catalysis via intramolecular dithiol-disulfide interchange with the nascent N-terminal dithiol.\",\n      \"method\": \"Reductive titrations of mixed-disulfide enzyme variants, stopped-flow rapid kinetics, spectrophotometric TNB release assay\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with chemical modification and rapid kinetics, mechanistic validation of C-terminal redox center\",\n      \"pmids\": [\"10074374\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Co-expression of differentially tagged wild-type and mutant TRXR subunits in E. coli demonstrated that the enzyme forms head-to-tail homodimers with intersubunit active sites: co-expression of the double mutant PfTrxRC88AC535A with wild-type yielded an inactive heterodimer, showing that each active site spans both subunits (N-terminal Cys88/Cys93 from one subunit, C-terminal Cys535/Cys540 from the other). Data also implied cooperative interaction between the two active sites.\",\n      \"method\": \"Co-expression of tagged wild-type and mutant proteins in E. coli, affinity chromatography purification of heterodimers, activity assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct biochemical reconstitution of heterodimers with functional readout, multiple mutant combinations tested\",\n      \"pmids\": [\"11022050\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Recombinant P. falciparum TRXR (PfTrxR) was stably expressed by silent mutagenesis and biochemically characterized. P. falciparum thioredoxin (PfTrx) is a substrate for TRXR with Km = 10.4 µM and kcat = 3100 min⁻¹; notably PfTrx is a better substrate for human TrxR (Km = 2 µM, kcat = 3300 min⁻¹). Reduced PfTrx was shown to reduce GSSG with a rate constant k2 = 0.039 µM⁻¹ min⁻¹, approximately 5-fold higher than thioredoxins from human, Drosophila, or E. coli, suggesting that the TRXR/Trx system can support GSSG reduction in glutathione reductase-deficient conditions.\",\n      \"method\": \"Recombinant protein expression (silent mutagenesis), steady-state kinetics, coupled enzyme assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro enzymatic characterization with defined substrates, kinetic constants determined, single lab\",\n      \"pmids\": [\"11013257\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Steady-state kinetic analyses with recombinant TRXR and its natural substrate PfTrx gave Km values of 0.8–2.1 µM for PfTrx, approximately 250-fold lower than for the model substrate E. coli thioredoxin; with similar kcat values this represents ≥250-fold higher catalytic efficiency for the cognate substrate.\",\n      \"method\": \"Recombinant protein expression, steady-state kinetics in coupled assay systems\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro kinetic characterization, single lab, single study\",\n      \"pmids\": [\"11223129\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Gene knockout attempts showed it was impossible to generate P. falciparum parasites with a disrupted trxR gene, establishing that TRXR is essential for erythrocytic stage survival. Co-transfection with a knockout construct plus a trxR coding sequence under the calmodulin promoter rescued viability despite disruption of the endogenous locus; co-transfectants were viable and overexpressed TRXR as confirmed by Northern and Western blot. PFGE and FIGE confirmed targeting was confined to chromosome 9 trxR locus.\",\n      \"method\": \"Gene knockout by homologous recombination, co-transfection rescue experiment, Southern blot, PFGE/FIGE, Northern blot, Western blot\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic essentiality established by failed knockout plus complementation rescue, multiple orthogonal molecular verification methods\",\n      \"pmids\": [\"12004069\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Ferriprotoporphyrin IX (FP/hemin) inhibits P. falciparum TRXR with a Ki of 1 µM, identified by enzyme activity assay with FP-immobilized agarose pull-down and kinetic analysis, indicating TRXR is a heme-interacting protein susceptible to inhibition by toxic heme released during hemoglobin degradation.\",\n      \"method\": \"FP-agarose pull-down, enzyme activity inhibition assay (Ki determination)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct biochemical inhibition assay with defined Ki, single lab, single study\",\n      \"pmids\": [\"12748176\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Mannich bases act as mechanism-based (bisalkylating) inhibitors of P. falciparum TRXR. Mechanistic studies showed that the C-terminal Cys535'/Cys540' pair—not the N-terminal Cys88/Cys93 pair—is the site of alkylation; alkylated TRXR loses thioredoxin reductase activity but retains ability to reduce low-Mr electron acceptors via the unmodified N-terminal thiols. The charge-transfer complex between Cys88 thiolate and FAD was used spectroscopically to monitor N-terminal thiol status.\",\n      \"method\": \"Mechanism-based inhibitor synthesis, thiol conjugation model studies, spectrophotometric charge-transfer complex monitoring, enzyme activity assays with defined substrates\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — detailed mechanistic dissection using multiple orthogonal chemical and spectral methods, site-specific modification confirmed\",\n      \"pmids\": [\"14609342\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Steady-state kinetics, anaerobic static titrations, and rapid kinetics of wild-type TRXR and His509Gln / Glu514Ala variants established that the His509-Glu514 dyad acts as the acid-base catalyst. His509Gln retained only 0.5% wild-type activity with severely reduced rate constants in both reductive and oxidative half-reactions and no thiolate-flavin charge-transfer complex. Glu514Ala retained 7% activity and was shown to be involved in dithiol-disulfide interchange between the Cys88/Cys93 and Cys535/Cys540 pairs; Glu514 greatly enhances His509's catalytic role.\",\n      \"method\": \"Site-directed mutagenesis, steady-state kinetics, anaerobic spectral titrations, stopped-flow rapid kinetics\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal methods (steady-state, rapid kinetics, spectral) on multiple mutants, mechanistic details resolved\",\n      \"pmids\": [\"16950793\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Three Mannich-base-derived compounds showed selective uncompetitive inhibition of P. falciparum TRXR relative to human TrxR (IC50 values 0.5–2 µM for PfTrxR vs. 4–140 µM for hTrxR). Mechanistic characterization of the most specific inhibitor (compound 7) via thiol conjugation model demonstrated alkylation mechanism. All three compounds showed antiplasmodial activity against chloroquine-resistant K1 strain.\",\n      \"method\": \"Enzyme inhibition assays (IC50, kinetic mode determination), thiol conjugation model for mechanism, in vitro antiplasmodial assay\",\n      \"journal\": \"Bioorganic & medicinal chemistry letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro enzymatic inhibition with mechanistic follow-up, single lab, single study\",\n      \"pmids\": [\"16458512\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Alternative translation initiation (ATI) is used by P. falciparum to achieve dual subcellular localization of TRXR: the enzyme is targeted to both the cytosol and an additional compartment through use of an alternative start codon, as determined by systematic subcellular localization mapping of redox proteins.\",\n      \"method\": \"Subcellular localization mapping of antioxidant/redox proteins by systematic study including GFP fusions and fractionation\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct localization experiment with mechanistic implication (ATI-mediated dual targeting), single lab, single study\",\n      \"pmids\": [\"21203490\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"In P. berghei, thioredoxin reductase gene was successfully disrupted by gene targeting, demonstrating that TRXR (the P. berghei ortholog) is dispensable for blood-stage proliferation and for the entire parasite life cycle, in contrast to the essential role shown in P. falciparum. Glutathione reductase, but not TRXR, was found essential for extracellular development in the insect vector.\",\n      \"method\": \"Gene targeting/knockout in P. berghei, phenotypic analysis across life cycle stages\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean genetic knockout with life-cycle-wide phenotypic analysis, contrasts P. falciparum essentiality result\",\n      \"pmids\": [\"20852334\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"P. falciparum TRXR was identified as a target of protein S-glutathionylation in a proteomic screen of the Plasmodium glutathionylome, using enzymatic deglutathionylation, biotin-maleimide affinity purification, and mass spectrometry. This establishes TRXR as a potential redox-regulated target of this post-translational modification in the parasite.\",\n      \"method\": \"Enzymatic deglutathionylation, affinity purification of biotin-maleimide-tagged proteins, proteomic MS identification\",\n      \"journal\": \"Antioxidants & redox signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — proteomic identification of glutathionylation target using affinity-based method, single lab, identification only (no functional consequence for TRXR specifically demonstrated)\",\n      \"pmids\": [\"21595565\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Crystal structure of recombinant P. falciparum TRXR was solved at 2.9 Å resolution, revealing that the dimer interface differs substantially from human TrxR and offers a selective binding site for non-competitive inhibitors. The Plasmodium-specific dimer interface architecture is conserved among Plasmodium species but absent in other Apicomplexa and mammals.\",\n      \"method\": \"X-ray crystallography (2.9 Å resolution) of recombinant PfTrxR\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure at defined resolution with functional implications for inhibitor selectivity, single lab\",\n      \"pmids\": [\"22889878\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Crystal structure of the P. falciparum TRXR–thioredoxin 1 complex was solved, revealing that the flexible C-terminal arm and a Plasmodium-specific insertion loop of TRXR are rearranged upon complex formation, suggesting the C-terminal arm undergoes conformational change during catalysis. Key differences from human TrxR in thioredoxin binding mode and the C-terminal arm conformation were identified. Cell biological experiments confirmed that specific TRXR inhibitors with antimalarial activity act on the parasite enzyme in vivo.\",\n      \"method\": \"X-ray crystallography of TrxR–Trx complex, structure-guided mutagenesis of substrate-binding and intersubunit-cavity residues, cell biological assays with specific inhibitors\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — co-crystal structure plus functional mutagenesis plus cell-biological validation, multiple orthogonal methods in one study\",\n      \"pmids\": [\"23845423\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Semisynthesis and site-directed mutagenesis of the C-terminal redox motif (G534CGGGKCG541, type II) of P. falciparum TRXR established: (i) deletion of Gly541 reduces activity ~50-fold by disrupting a stabilizing hydrogen bond in the β-turn-β motif; (ii) alterations of the 20-membered disulfide ring by deletion or substitution impair catalysis; (iii) replacement of Cys with homocysteine (semisynthesis) reduced activity by disrupting ring geometry; (iv) a chimeric TRXR bearing the type I GCCG sequence had 500-fold less activity, while the GCUG (selenocysteine) chimera had higher activity, supporting an 'electrophilic activation' mechanism for the native Cys-based type II center.\",\n      \"method\": \"Site-directed mutagenesis, protein semisynthesis (incorporation of selenocysteine and homocysteine), steady-state kinetic assays with cognate and non-cognate substrates\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — protein semisynthesis plus mutagenesis with rigorous kinetics, multiple mechanistic conclusions, single lab but multiple orthogonal approaches\",\n      \"pmids\": [\"24400600\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Using the 'seleno effect' approach (Sec substitution for Cys), it was established that Cys535 acts as an electrophile/leaving group (C535U substitution decreased activity ~9-fold) while Cys540 acts as the nucleophile attacking the N-terminal dithiol (C540U substitution increased activity ~1.5-fold) in the thiol-disulfide exchange step between the N-terminal and C-terminal redox centers of P. falciparum TRXR. Full-length semisynthetic enzymes confirmed these roles.\",\n      \"method\": \"Protein semisynthesis (selenocysteine substitution at individual C-terminal residues), activity assays with truncated and full-length semisynthetic enzymes\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — protein semisynthesis with functional readout differentiating electrophilic vs. nucleophilic roles of individual cysteines, single lab, multiple enzyme forms tested\",\n      \"pmids\": [\"29485860\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The glutathione system (via glutaredoxin) can reduce thioredoxin-like protein 1 and thioredoxin 2, which are either poor substrates for TRXR or lack access to TRXR, providing functional complementation between the two redox systems. This cross-talk was demonstrated biochemically, placing TRXR within a broader redox network where its substrate specificity limits access to certain thioredoxin isoforms.\",\n      \"method\": \"In vitro biochemical cross-reactivity assays between glutathione system components and thioredoxin isoforms, activity measurements\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct biochemical assay establishing cross-talk, single lab, positions TRXR by substrate specificity within network\",\n      \"pmids\": [\"28479253\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"current_model\": \"P. falciparum TRXR (PF3D7_0923800) is an essential homodimeric high-Mr flavoenzyme that transfers electrons from NADPH via FAD to an N-terminal Cys88/Cys93 disulfide, then via His509-Glu514 acid-base catalysis to a distinctive 20-membered C-terminal Cys535/Cys540 disulfide ring on the opposite subunit (intersubunit active site), which in turn reduces the cognate substrate thioredoxin 1; the C-terminal arm undergoes conformational rearrangement upon thioredoxin binding, a Plasmodium-specific insertion loop and dimer interface differentiate the enzyme from human TrxR, dual localization is achieved by alternative translation initiation, and while genetically essential in P. falciparum blood stages, the P. berghei ortholog is dispensable throughout the life cycle.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PF3D7_0923800 (TRXR) is a high-Mr flavoenzyme thioredoxin reductase that constitutes the terminal electron-donating step of the P. falciparum thioredoxin redox system, and it is essential for erythrocytic-stage survival [#0, #6]. Catalysis proceeds by electron transfer from NADPH through FAD to an N-terminal redox-active Cys88/Cys93 disulfide, with His509 serving as the active-site base whose function is enhanced by Glu514 acting as an acid-base dyad [#0, #9]. Electrons are then relayed to the C-terminal Cys535/Cys540 pair, which forms a 20-membered type II disulfide ring required specifically for reduction of the physiological substrate thioredoxin rather than for FAD-proximal chemistry [#1, #16]; within this ring, Cys535 acts as the electrophile/leaving group and Cys540 as the attacking nucleophile in the intramolecular dithiol-disulfide interchange [#17]. The enzyme is a head-to-tail homodimer with intersubunit active sites, such that the N-terminal cysteines of one subunit pair with the C-terminal cysteines of the opposite subunit [#3]. TRXR reduces its cognate P. falciparum thioredoxin with high catalytic efficiency and marked substrate preference over model thioredoxins [#4, #5], and crystal structures of the free enzyme and of the TRXR–thioredoxin 1 complex reveal a Plasmodium-specific dimer interface and a flexible C-terminal arm plus insertion loop that rearrange upon substrate binding, features that distinguish it from human TrxR and provide selective inhibitor-binding surfaces [#14, #15]. These structural and mechanistic distinctions underlie its validation as an antimalarial drug target, with Mannich-base mechanism-based inhibitors that alkylate the C-terminal cysteine pair and act selectively on the parasite enzyme in vivo [#8, #10, #15]. The enzyme is dually localized to the cytosol and a second compartment via alternative translation initiation [#11]. In P. berghei, the TRXR ortholog is dispensable throughout the life cycle, in contrast to its essentiality in P. falciparum blood stages [#12].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Establishing which residues perform the core redox chemistry was needed to place TRXR mechanistically; mutagenesis identified the N-terminal disulfide and active-site base and assigned the enzyme to the high-Mr TrxR class.\",\n      \"evidence\": \"Site-directed mutagenesis, steady-state kinetics, and spectral analysis of recombinant enzyme from E. coli\",\n      \"pmids\": [\"9368022\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define how electrons reach the physiological substrate thioredoxin\", \"No structural basis for the EH2 form\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Because the N-terminal disulfide alone could not explain thioredoxin reduction, the C-terminal cysteines were tested and found specifically required for electron transfer to thioredoxin but not for low-Mr acceptor chemistry.\",\n      \"evidence\": \"Single, double, and deletion mutants assayed for DTNB reactivity versus thioredoxin reductase activity\",\n      \"pmids\": [\"9563503\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not directly demonstrate the C-terminal cysteines act as kinetically competent electron acceptors\", \"Did not assign individual roles to Cys535 vs Cys540\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"To prove the C-terminal cysteines are true catalytic intermediates rather than merely required, mixed-disulfide variants were reduced at wild-type-comparable rates, confirming an intramolecular dithiol-disulfide interchange relay.\",\n      \"evidence\": \"Reductive titrations of DTNB-modified C535A/C540A variants with stopped-flow rapid kinetics\",\n      \"pmids\": [\"10074374\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Individual electrophile/nucleophile roles of the two cysteines remained undefined\", \"Intersubunit geometry not yet established\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"The spatial organization of the two redox centers was unknown; co-expression of complementary mutants showed the enzyme is a head-to-tail homodimer with active sites spanning both subunits.\",\n      \"evidence\": \"Co-expression of differentially tagged wild-type and mutant subunits in E. coli, heterodimer purification, and activity assays\",\n      \"pmids\": [\"11022050\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cooperativity between active sites was implied but not fully quantified\", \"No atomic structure of the dimer interface at this stage\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defining the physiological substrate specificity clarified TRXR's cellular role; kinetics with the cognate PfTrx showed markedly higher catalytic efficiency and lower Km than for model thioredoxins.\",\n      \"evidence\": \"Recombinant enzyme steady-state kinetics comparing cognate PfTrx and E. coli thioredoxin in coupled assays (with earlier characterization in 11013257)\",\n      \"pmids\": [\"11223129\", \"11013257\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Substrate preference measured in vitro only, single lab\", \"Did not address which cellular thioredoxin pools are accessible in vivo\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Whether TRXR is required for parasite survival determined its drug-target value; failed knockout with complementation rescue established essentiality in erythrocytic stages.\",\n      \"evidence\": \"Gene knockout by homologous recombination, co-transfection rescue, and multiple molecular verifications in P. falciparum\",\n      \"pmids\": [\"12004069\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Essentiality shown for blood stage only\", \"Which downstream redox function is limiting for survival not defined\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"The chemical basis of catalysis was refined by showing His509 acts with Glu514 as an acid-base dyad driving both half-reactions and the dithiol-disulfide interchange.\",\n      \"evidence\": \"Site-directed mutagenesis of His509Gln and Glu514Ala with steady-state and stopped-flow kinetics and anaerobic spectral titrations\",\n      \"pmids\": [\"16950793\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise protonation states during turnover not directly observed\", \"Structural context of the dyad not yet crystallographically resolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Testing druggability, heme and Mannich-base compounds were shown to inhibit TRXR, with Mannich bases alkylating specifically the C-terminal cysteine pair as mechanism-based inhibitors.\",\n      \"evidence\": \"FP-agarose pull-down and Ki determination for hemin; mechanism-based inhibitor studies with thiol-conjugation models and charge-transfer monitoring\",\n      \"pmids\": [\"12748176\", \"14609342\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cellular relevance of heme inhibition not established in these studies\", \"Selectivity over human TrxR not yet quantified\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Selective inhibition over the human enzyme was required for therapeutic value; Mannich-base derivatives showed uncompetitive, parasite-selective inhibition and antiplasmodial activity.\",\n      \"evidence\": \"Enzyme inhibition IC50/mode determination for PfTrxR versus hTrxR and antiplasmodial assay against K1 strain\",\n      \"pmids\": [\"16458512\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Target engagement in vivo not yet demonstrated\", \"Single lab, single study\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"The subcellular distribution and organismal requirement were addressed: dual cytosolic/second-compartment localization arises via alternative translation initiation, and the P. berghei ortholog is dispensable across the life cycle.\",\n      \"evidence\": \"Systematic localization mapping (GFP fusions/fractionation) in P. falciparum; gene targeting and life-cycle phenotyping in P. berghei\",\n      \"pmids\": [\"21203490\", \"20852334\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The additional non-cytosolic compartment is not precisely identified\", \"Basis for the P. falciparum/P. berghei essentiality divergence unexplained\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}, {\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Post-translational regulation was explored; TRXR was identified as an S-glutathionylation target in the parasite glutathionylome.\",\n      \"evidence\": \"Enzymatic deglutathionylation, biotin-maleimide affinity purification, and proteomic MS in P. falciparum\",\n      \"pmids\": [\"21595565\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of glutathionylation for TRXR activity not demonstrated\", \"Modified residues not mapped\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"A structural basis for selective inhibition was needed; the crystal structure revealed a Plasmodium-specific dimer interface offering a non-competitive inhibitor-binding site absent in human and other apicomplexan enzymes.\",\n      \"evidence\": \"X-ray crystallography of recombinant PfTrxR at 2.9 Å\",\n      \"pmids\": [\"22889878\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Substrate-bound conformation not resolved in this structure\", \"Inhibitor complexes at the interface not directly captured\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"How TRXR engages its substrate was resolved by the co-crystal structure, showing the flexible C-terminal arm and Plasmodium-specific insertion loop rearrange on thioredoxin binding, with inhibitors validated to act on the enzyme in vivo.\",\n      \"evidence\": \"X-ray crystallography of the TrxR–Trx1 complex, structure-guided mutagenesis, and cell-biological inhibitor assays\",\n      \"pmids\": [\"23845423\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full catalytic-cycle conformational dynamics not directly visualized\", \"Mechanism of the second-compartment role not addressed\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"The chemical logic of the unusual C-terminal redox center was dissected, showing the 20-membered type II disulfide ring geometry and Gly541 hydrogen bond are essential and that the native Cys-based center operates via electrophilic activation.\",\n      \"evidence\": \"Protein semisynthesis (Sec, homocysteine incorporation) and mutagenesis with kinetics on cognate and non-cognate substrates\",\n      \"pmids\": [\"24400600\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Individual redox roles of Cys535 vs Cys540 not yet separated\", \"Ring dynamics during catalysis inferred, not observed\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"The individual catalytic roles within the C-terminal ring were finally assigned: Cys535 is the electrophile/leaving group and Cys540 the nucleophile in the interchange with the N-terminal dithiol.\",\n      \"evidence\": \"Selenocysteine 'seleno effect' substitution at individual C-terminal residues in truncated and full-length semisynthetic enzymes\",\n      \"pmids\": [\"29485860\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Transition-state structure not directly determined\", \"Contribution of the intersubunit geometry to these roles not isolated\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"TRXR's place in the wider redox network was defined by substrate accessibility, showing certain thioredoxin isoforms are poor TRXR substrates and are instead served by the glutathione/glutaredoxin system.\",\n      \"evidence\": \"In vitro cross-reactivity and activity assays between glutathione-system components and thioredoxin isoforms\",\n      \"pmids\": [\"28479253\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological significance of the complementation in vivo not established\", \"Compartment-specific access not tested\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved why TRXR is essential in P. falciparum but dispensable in P. berghei, what the second (non-cytosolic) localization compartment is and what TRXR does there, and whether S-glutathionylation functionally regulates the enzyme.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Species divergence in essentiality unexplained\", \"Identity and function of the second localization compartment unknown\", \"Functional impact of glutathionylation undetermined\"],\n      \"attribution\": []\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0004791\", \"supporting_discovery_ids\": [0, 1, 4, 5]},\n      {\"term_id\": \"GO:0050660\", \"supporting_discovery_ids\": [0, 8]},\n      {\"term_id\": \"GO:0050661\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0015036\", \"supporting_discovery_ids\": [1, 2, 16, 17]},\n      {\"term_id\": \"GO:0042803\", \"supporting_discovery_ids\": [3, 14]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [11]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0019430\", \"supporting_discovery_ids\": [4, 18]},\n      {\"term_id\": \"GO:0045454\", \"supporting_discovery_ids\": [4, 5, 18]}\n    ],\n    \"complexes\": [\n      \"Homodimer with intersubunit active sites (head-to-tail arrangement) [#3, #14]\",\n      \"TRXR–thioredoxin 1 substrate complex [#15]\"\n    ],\n    \"partners\": [\n      \"P. falciparum thioredoxin 1 (cognate substrate) [#4, #5, #15]\",\n      \"Ferriprotoporphyrin IX / hemin (inhibitor, Ki ~1 µM) [#7]\"\n    ],\n    \"other_free_text\": [\n      \"N-terminal redox-active Cys88/Cys93 disulfide and His509–Glu514 acid-base dyad perform FAD-proximal chemistry [#0, #9]\",\n      \"C-terminal 20-membered type II disulfide ring (G534CGGGKCG541) with Cys535 electrophile and Cys540 nucleophile transfers electrons to thioredoxin [#16, #17]\",\n      \"Essential in P. falciparum blood stages but dispensable in P. berghei across the life cycle [#6, #12]\",\n      \"Dual localization via alternative translation initiation [#11]\",\n      \"Target of S-glutathionylation in the parasite glutathionylome [#13]\",\n      \"Mannich-base compounds are mechanism-based, parasite-selective inhibitors alkylating the C-terminal cysteine pair [#8, #10, #15]\",\n      \"Plasmodium-specific dimer interface and rearranging C-terminal arm/insertion loop distinguish it from human TrxR [#14, #15]\"\n    ]\n  }\n}","audit_flag":null,"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_0923800","name":null,"product":"thioredoxin reductase","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PbANKA","gene_id":"PBANKA_0824700","name":null,"product":"thioredoxin reductase, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_0721800","name":null,"product":"thioredoxin reductase, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"TRXR","evaluation":null}