{"gene":"PF3D7_0808200","run_date":"2026-09-08T12:51:27","timeline":{"discoveries":[{"year":2017,"finding":"PMX (PF3D7_0808200) is essential for both erythrocyte egress and invasion in P. falciparum, acting by controlling maturation of the subtilisin-like serine protease SUB1 in exoneme secretory vesicles.","method":"Conditional knockdown/genetic ablation combined with cell biological and biochemical analysis of SUB1 maturation","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — two independent labs published simultaneously with genetic loss-of-function and biochemical substrate analysis, replicated across two papers","pmids":["29074774","29074775"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2017,"finding":"Recombinantly expressed PMX cleaves egress and invasion factors in a manner sensitive to the inhibitor compound 49c, establishing PMX as the maturase for microneme proteins including those required for egress.","method":"In vitro cleavage assay with recombinant PMX and PMX inhibitor 49c; conditional gene excision","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro enzymatic assay with recombinant protein plus inhibitor sensitivity, combined with conditional genetics, replicated in two simultaneous independent studies","pmids":["29074775","29074774"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2020,"finding":"PMX is required for the proteolytic maturation of SUB1 in P. falciparum; knockdown of the ER-resident calcium-binding protein PfERC prevents proteolytic maturation of PMX, which in turn prevents SUB1 cleavage, placing PfERC upstream of PMX in the egress proteolytic cascade.","method":"Conditional knockdown of PfERC; double-mutant parasite analysis; immunoblot analysis of PMX and SUB1 processing","journal":"mBio","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal epistasis using double-mutant parasites with defined biochemical readout (PMX and SUB1 maturation status), single lab but multiple orthogonal genetic approaches","pmids":["32098818"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2020,"finding":"PMX acts as a master modulator of merozoite invasion by directly maturing proteins required for invasion, parasite development, and egress; dual PMX/PMIX inhibitor WM382 blocks multiple life-cycle stages including asexual blood stage, liver stage, and transmission to mosquitoes.","method":"Chemical inhibition with WM382 (dual PMIX/PMX inhibitor); in vivo mouse models (P. berghei and humanized mouse P. falciparum); in vitro selection for resistance","journal":"Cell host & microbe","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal in vivo and in vitro approaches across multiple parasite species and life-cycle stages","pmids":["32109369"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium berghei","strain":""}]},{"year":2022,"finding":"PMX autoprocesses via self-cleavage at multiple sites to generate different isoforms; a quadruple cleavage-site mutant that remains full-length retains in vitro enzymatic activity and is trafficked normally, supporting normal egress, invasion and parasite growth. The N-terminal half of the prodomain remains bound to the catalytic domain after processing and is required for proper intracellular trafficking of PMX. PMX cleaves microneme and exoneme substrates before their discharge, while rhoptry substrates dependent on PMX are cleaved after exoneme discharge into the parasitophorous vacuole.","method":"Site-directed mutagenesis of cleavage sites; in vitro enzymatic assay; parasite transfection; localization studies; biochemical fractionation","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis combined with in vitro assay and parasite genetics, single lab but multiple orthogonal methods","pmids":["35927261"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2022,"finding":"Crystal structures of PfPMX zymogen reveal a novel inactivation mechanism involving a unique twisted loop from the prosegment and Arg244 from the mature enzyme. Maturation occurs through cleavage of the prosegment at multiple sites. The structure also provides molecular details of inhibitor 49c binding to the active site.","method":"X-ray crystallography of PfPMX zymogen and inhibitor-bound forms; active-site mutant analysis","journal":"Protein science","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure determination with functional validation of inactivation mechanism, single lab but direct structural evidence","pmids":["35048450"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2022,"finding":"Structures of PMX from P. falciparum and P. vivax bound to inhibitors WM4 and WM382 reveal that PMX and PMIX have similar substrate specificity but distinct differences for peptide and protein substrates; drug selectivity differences between PMIX and PMX map to variations in the S' region and engagement of the S3 pocket.","method":"X-ray crystallography; enzyme kinetic assays; substrate specificity profiling","journal":"Structure","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structures combined with enzyme kinetic assays, single lab but multiple orthogonal methods","pmids":["35460613"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium vivax","strain":""}]},{"year":2023,"finding":"PMX directly cleaves both the inhibitory prodomain fragment p31 and the p54 intermediate of SUB1 in vitro using recombinant proteins. PMX cleavage of p31 removes the inhibitory propiece, activating SUB1; upon PMX knockdown, the p31-p54 complex accumulates in parasites. The conversion of p54 to p47 by PMX is not required for SUB1 activity once p31 is removed.","method":"Recombinant protein cleavage assay; mapping of cleavage sites; PMX conditional knockdown; immunoblot","journal":"mBio","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with recombinant proteins plus cleavage site mapping combined with parasite genetic knockdown, single lab with multiple orthogonal methods","pmids":["37036362"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2023,"finding":"PMX processes the N-terminal prodomain of PfRh5 within micronemes of the PCRCR invasion complex, activating the complex to expose its basigin-binding function required for merozoite invasion of erythrocytes.","method":"Biochemical analysis of PCRCR complex processing; conditional PMX manipulation; invasion assays; mass spectrometry","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct biochemical substrate processing assay combined with functional invasion readout, single lab with multiple orthogonal approaches","pmids":["37072430"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2016,"finding":"PMX protein is expressed in gametes, zygotes, and ookinetes of P. falciparum (mosquito stages), as confirmed by RT-PCR, western blot, and immunofluorescence; antibodies against PMX reduce P. falciparum invasion of the mosquito midgut.","method":"RT-PCR; western immunoblot; immunofluorescence assay; standard membrane feeding assay (SMFA)","journal":"Malaria journal","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — protein expression confirmed by multiple methods in mosquito stages, transmission-blocking shown by antibody inhibition in SMFA, but no direct genetic knockout","pmids":["26911483"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2024,"finding":"PMX-mediated cleavage of the SUB1 prodomain (p31) activates SUB1 enzyme activity; p31 and the p31-p54 complex are largely dimeric under acidic conditions where PMX acts; PMX cleavage of p31 causes rapid loss of its inhibitory capacity and directly activates SUB1; the order of PMX cleavage sites on p31 was determined.","method":"Biochemical and enzymatic analysis; recombinant protein assays; dimerization analysis","journal":"Biochimica et biophysica acta. General subjects","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro reconstitution with recombinant proteins and activity assay, single lab, largely confirmatory of prior findings with additional mechanistic detail","pmids":["38969256"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2024,"finding":"PMX processes the SUB1 prodomain within acidic secretory organelles; this processing is required for full SUB1 activation upon discharge into the parasitophorous vacuole at neutral pH, where the Sub1 prodomain mediates pH-dependent dimerization and autoinhibition.","method":"Crystal structure of full-length PfSub1; structural, biochemical, and biophysical studies including dimerization analysis","journal":"mBio","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — crystal structure of Sub1 combined with biochemical studies placing PMX action in acidic organelles, but PMX itself was not the experimental subject; finding is about PMX's role as inferred from Sub1 biology","pmids":["38386597"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2022,"finding":"PMX has a substrate consensus cleavage motif SFhE (h = hydrophobic amino acid); PMX prefers Phe in the P1 position, di-substitution at the β-carbon of the P2 moiety, and a hydrophobic P3 group, as established by peptidomimetic inhibitor structure-activity analysis and modeling.","method":"Enzymatic inhibition assays with peptidomimetics; substrate processing assays; molecular modelling","journal":"ChemMedChem","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — enzymatic assay defining substrate specificity with structure-activity analysis, single lab but biochemical and cellular validation","pmids":["35906744"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2009,"finding":"A P. falciparum line overexpressing PMX showed fourfold reduced susceptibility to the diphenylurea compound GB-III-32, suggesting PMX is an alternative target for certain aspartic protease inhibitors that act early in the intraerythrocytic life cycle.","method":"Overexpression of PMX; drug susceptibility assay (IC50 comparison)","journal":"Antimicrobial agents and chemotherapy","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single overexpression experiment with IC50 shift, single lab, indirect inference about target identity","pmids":["19752273"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2022,"finding":"HIV-1 protease inhibitors ritonavir (RTV) and lopinavir (LPV) inhibit PMX enzymatic activity; RTV binds to the PMX active site as shown by inhibition assay, representing the first report of PMX inhibition by an HIV-1 protease inhibitor.","method":"Enzymatic inhibition assay with recombinant PMX; crystal structure of PMII-drug complexes (structural inference for PMX active site)","journal":"Current research in structural biology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — enzymatic inhibition assay for PMX, but crystal structure solved only for PMII not PMX; single lab, single method for PMX","pmids":["38304146"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2025,"finding":"Crystal structure of PMX bound to macrocyclic peptidomimetic inhibitor 7k at 1.7 Å reveals PMX adopts a novel conformation upon 7k binding, involving significant movement of the S2'S2 loop and S2 flap leading to partial active site closure; catalytic aspartates D266 and D467 directly interact with the hydroxyethylamine pharmacophore.","method":"X-ray crystallography at 1.7 Å; molecular docking","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — high-resolution crystal structure with direct identification of catalytic residue interactions, single lab","pmids":["40043835"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2026,"finding":"A 2-piperazino-pyrimidine compound (FPSA) targets PMX in P. falciparum: resistant parasite selection identified SNVs (I252V or E55G) and gene duplications in the PMX-encoding locus; genome-edited parasites with these substitutions showed reduced FPSA susceptibility; FPSA inhibited recombinant PMX proteolytic activity in vitro and blocked PMX substrate processing in parasites.","method":"Forward genetics (resistant parasite selection and whole-genome sequencing); CRISPR genome editing; in vitro enzymatic assay with recombinant PMX; substrate processing assay in parasites; transcriptomics","journal":"International journal for parasitology. Drugs and drug resistance","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal approaches (forward genetics, genome editing, in vitro enzymatic assay, cellular substrate processing), single lab","pmids":["42025246"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":"Dd2"}]},{"year":2023,"finding":"Preprint version: PMX directly cleaves both p31 and p54 of SUB1 using recombinant proteins; cleavage sites on p31 were mapped; p54 is fully functional once p31 is removed, demonstrating that conversion to p47 is dispensable for SUB1 activity. Heterologous protease-mediated relief of propiece inhibition is established as the mechanism for PMX-dependent SUB1 activation.","method":"Recombinant protein cleavage assay; cleavage site mapping; conditional PMX knockdown; immunoblot","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — preprint version of subsequently peer-reviewed work (PMID 37036362); in vitro reconstitution with recombinant proteins, single lab","pmids":["36712005"],"is_preprint":true,"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"current_model":"PMX (PF3D7_0808200) is an essential aspartic protease in Plasmodium falciparum that functions as a master maturase in the egress/invasion proteolytic cascade: it is activated from its zymogen form (via a novel prosegment inactivation mechanism involving a twisted loop and Arg244) in acidic secretory organelles under control of the upstream ER-resident regulator PfERC, then cleaves microneme and exoneme substrates (including the SUB1 prodomain p31 to activate the effector protease SUB1, and the PfRh5/PCRCR complex to enable basigin binding) prior to their discharge, while cleaving rhoptry substrates after exoneme discharge into the parasitophorous vacuole, collectively controlling merozoite egress and erythrocyte invasion across multiple life-cycle stages."},"narrative":{"mechanistic_narrative":"PMX (PF3D7_0808200) is an essential Plasmodium falciparum aspartic protease that acts as a master maturase governing the proteolytic cascade underlying merozoite egress from and invasion of erythrocytes [PMID:29074774, PMID:29074775, PMID:32109369]. Functioning within acidic secretory organelles, PMX cleaves microneme and exoneme substrates prior to their discharge, while PMX-dependent rhoptry substrates are processed only after exoneme discharge into the parasitophorous vacuole [PMID:35927261]. A central substrate is the subtilisin-like protease SUB1: PMX directly removes SUB1's inhibitory prodomain fragment p31, relieving propiece autoinhibition and activating SUB1, whereas the further conversion of the p54 intermediate to p47 is dispensable for activity [PMID:37036362]. PMX also processes the N-terminal prodomain of PfRh5 within micronemes of the PCRCR complex, exposing its basigin-binding function required for invasion, establishing PMX as a hub coordinating both egress and invasion effectors [PMID:37072430]. PMX activity is controlled upstream by the ER-resident calcium-binding protein PfERC, whose knockdown blocks proteolytic maturation of PMX and consequently SUB1 cleavage [PMID:32098818]. Structurally, the PMX zymogen is held inactive by a unique twisted prosegment loop engaging Arg244, and maturation proceeds through prosegment cleavage; the catalytic aspartates D266 and D467 form the active site, and PMX recognizes an SFhE consensus motif favoring Phe at P1 [PMID:35048450, PMID:40043835, PMID:35906744]. PMX is a validated antimalarial drug target: inhibitors including 49c, the dual PMIX/PMX inhibitor WM382, and a 2-piperazino-pyrimidine (FPSA) block its enzymatic and substrate-processing activity, with WM382 active across asexual blood, liver, and transmission stages, and resistance mapping to substitutions in the PMX locus [PMID:29074775, PMID:29074774, PMID:32109369, PMID:42025246].","teleology":[{"year":2016,"claim":"Before its egress/invasion role was defined, it was unknown whether PMX is expressed and functional in mosquito stages; detection in gametes, zygotes and ookinetes with antibody-mediated blockade of midgut invasion established a transmission-stage role.","evidence":"RT-PCR, western blot, immunofluorescence, and standard membrane feeding assay in P. falciparum mosquito stages","pmids":["26911483"],"confidence":"Medium","gaps":["No direct genetic knockout of PMX in mosquito stages","Substrates in gametes/zygotes/ookinetes not identified"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2017,"claim":"The essential function of PMX in the blood stage was unknown; conditional genetics plus recombinant enzyme assays established PMX as an essential protease controlling SUB1 maturation and cleaving microneme egress/invasion factors.","evidence":"Conditional knockdown/gene excision and in vitro cleavage assays with recombinant PMX and inhibitor 49c, in two simultaneous P. falciparum studies","pmids":["29074774","29074775"],"confidence":"High","gaps":["Full substrate repertoire not enumerated","Mechanism of PMX zymogen activation not resolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2020,"claim":"How PMX itself is regulated was unknown; epistasis placed the ER-resident calcium-binding protein PfERC upstream of PMX maturation, linking PMX activation to secretory-organelle regulation.","evidence":"Conditional knockdown of PfERC and double-mutant immunoblot analysis of PMX and SUB1 processing in P. falciparum","pmids":["32098818"],"confidence":"High","gaps":["Direct molecular mechanism by which PfERC controls PMX maturation not defined","Whether PfERC acts on PMX directly or via other factors unresolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2020,"claim":"The breadth of PMX's role across the life cycle and its druggability were unknown; a dual PMIX/PMX inhibitor demonstrated PMX matures invasion, development and egress proteins and blocks asexual, liver and transmission stages.","evidence":"Chemical inhibition with WM382, in vivo P. berghei and humanized-mouse P. falciparum models, and in vitro resistance selection","pmids":["32109369"],"confidence":"High","gaps":["Inhibitor targets both PMIX and PMX, so PMX-specific contributions per stage not fully separated","Individual stage-specific substrates not mapped"],"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium berghei","strain":""}]},{"year":2022,"claim":"The structural basis for PMX zymogen inactivation and inhibitor binding was unknown; crystal structures revealed a novel prosegment twisted loop engaging Arg244 and defined the active-site inhibitor interactions.","evidence":"X-ray crystallography of PfPMX zymogen and inhibitor-bound forms with active-site mutant analysis","pmids":["35048450"],"confidence":"High","gaps":["Structure of the fully mature enzyme with a physiological substrate not captured","Dynamics of activation in vivo not observed"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2022,"claim":"Whether PMX autoprocessing and prodomain retention are required for function was unknown; a non-cleavable full-length mutant retained activity and normal trafficking, while the N-terminal prodomain half was shown necessary for trafficking, and the timing of substrate cleavage relative to discharge was defined.","evidence":"Site-directed cleavage-site mutagenesis, in vitro enzymatic assay, parasite transfection, localization and fractionation in P. falciparum","pmids":["35927261"],"confidence":"High","gaps":["Functional significance of the multiple autoprocessed isoforms unclear","Trafficking receptor/machinery engaging the prodomain not identified"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2022,"claim":"Determinants of PMX substrate specificity and selectivity versus PMIX were unknown; kinetic and structural profiling defined an SFhE consensus motif and mapped drug selectivity to the S' and S3 regions.","evidence":"X-ray crystallography of P. falciparum and P. vivax PMX with WM4/WM382, enzyme kinetics, peptidomimetic SAR and substrate profiling","pmids":["35460613","35906744"],"confidence":"Medium","gaps":["Native protein substrate cleavage sites not all validated against the consensus","In-parasite specificity determinants not tested by mutagenesis"],"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium vivax","strain":""}]},{"year":2023,"claim":"The precise mechanism of PMX-dependent SUB1 activation was unknown; direct cleavage of the p31 inhibitory prodomain (not the p54-to-p47 conversion) was shown to relieve propiece inhibition and activate SUB1.","evidence":"Recombinant protein cleavage assays with site mapping and PMX conditional knockdown/immunoblot in P. falciparum (peer-reviewed, preceded by bioRxiv preprint)","pmids":["37036362","36712005"],"confidence":"High","gaps":["Kinetics of p31 removal in vivo not quantified","Whether other cofactors modulate this activation not addressed"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2023,"claim":"Beyond SUB1, whether PMX activates invasion-complex ligands was unknown; PMX was shown to process the PfRh5 N-terminal prodomain within micronemes of the PCRCR complex to expose basigin binding.","evidence":"Biochemical PCRCR processing analysis, conditional PMX manipulation, mass spectrometry and invasion assays in P. falciparum","pmids":["37072430"],"confidence":"High","gaps":["Kinetic ordering of PfRh5 versus SUB1 processing not defined","Other PCRCR component processing events not fully mapped"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2024,"claim":"The physicochemical context of SUB1 prodomain inhibition and its relief was unclear; work showed p31 acts as a pH-dependent dimeric autoinhibitor cleaved by PMX in acidic organelles, with SUB1 fully activated upon neutral-pH discharge.","evidence":"Crystal structure of full-length PfSub1, recombinant protein activity and dimerization assays inferring PMX's acidic-organelle action in P. falciparum","pmids":["38969256","38386597"],"confidence":"Medium","gaps":["PMX itself was not the direct experimental subject in the Sub1 structural work","Behavior of PMX under the same pH transitions not directly measured"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2025,"claim":"High-resolution definition of the PMX active site engaging an inhibitor was lacking; a 1.7 Å structure revealed catalytic aspartates D266/D467 contacting the hydroxyethylamine pharmacophore and a novel closure conformation of the S2'/S2 loop and S2 flap.","evidence":"X-ray crystallography of PMX bound to macrocyclic peptidomimetic 7k with molecular docking","pmids":["40043835"],"confidence":"High","gaps":["Conformational flexibility during catalysis of native substrates not resolved","Generalizability of the closure conformation to other inhibitor classes unknown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2026,"claim":"Whether new chemotypes engage PMX directly and how resistance arises was unknown; a 2-piperazino-pyrimidine (FPSA) was shown to inhibit recombinant PMX and block substrate processing, with resistance mapping to PMX-locus substitutions and duplications.","evidence":"Resistant-parasite selection with whole-genome sequencing, CRISPR editing, in vitro enzymatic assay and cellular substrate processing in P. falciparum Dd2","pmids":["42025246"],"confidence":"High","gaps":["Structural basis of I252V/E55G-mediated resistance not resolved","Contribution of gene duplication versus point mutation to resistance not dissected"],"attribution":[{"species":"Plasmodium falciparum","strain":"Dd2"}]},{"year":null,"claim":"The complete PMX substrate repertoire across all life-cycle stages and the direct molecular mechanism linking PfERC to PMX zymogen maturation remain undefined.","evidence":"","pmids":[],"confidence":"Low","gaps":["Full census of PMX substrates beyond SUB1 and PfRh5/PCRCR not established","Direct biochemical link between PfERC and PMX activation unresolved","Stage-specific mosquito-stage substrates uncharacterized"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":["PMX processes the PfRh5/PCRCR invasion complex (substrate, not a component) [#8]"],"partners":["SUB1 (SUBTILISIN-LIKE PROTEASE; SUBSTRATE — P31 PRODOMAIN REMOVAL ACTIVATES SUB1) [#0, #7, #10]","PFRH5 / PCRCR COMPLEX (SUBSTRATE — PRODOMAIN PROCESSING EXPOSES BASIGIN BINDING) [#8]","PFERC (ER-RESIDENT CALCIUM-BINDING PROTEIN; UPSTREAM REGULATOR OF PMX MATURATION) [#2]"],"other_free_text":["Zymogen inactivation via a unique twisted prosegment loop and Arg244; maturation by prosegment cleavage at multiple sites [#5]","Autoprocesses at multiple self-cleavage sites into distinct isoforms; N-terminal prodomain half stays bound and is required for trafficking [#4]","Catalytic aspartates D266 and D467 form the active site [#15]","Substrate consensus motif SFhE (Phe preferred at P1) [#12]","Validated antimalarial drug target inhibited by 49c, WM382/WM4, ritonavir/lopinavir, and FPSA; resistance maps to PMX-locus I252V/E55G and gene duplication [#1, #3, #6, #14, #16]","Expressed and functional in mosquito stages (gametes, zygotes, ookinetes); antibodies reduce midgut invasion [#9]"]}},"prefetch_data":{},"corpus_meta":[{"pmid":"11872398","id":"PMC_11872398","title":"Aspartic proteases of Plasmodium falciparum and other parasitic protozoa as drug targets.","date":"2001","source":"Trends in parasitology","url":"https://pubmed.ncbi.nlm.nih.gov/11872398","citation_count":254,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["curated_ref"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"29074774","id":"PMC_29074774","title":"Plasmepsins IX and X are essential and druggable mediators of malaria parasite egress and invasion.","date":"2017","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/29074774","citation_count":145,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["PMX"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"29074775","id":"PMC_29074775","title":"A multistage antimalarial targets the plasmepsins IX and X essential for invasion and egress.","date":"2017","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/29074775","citation_count":121,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["PMX"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"32109369","id":"PMC_32109369","title":"Dual Plasmepsin-Targeting Antimalarial Agents Disrupt Multiple Stages of the Malaria Parasite Life Cycle.","date":"2020","source":"Cell host & microbe","url":"https://pubmed.ncbi.nlm.nih.gov/32109369","citation_count":107,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["PMX","plasmepsin X"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"19752273","id":"PMC_19752273","title":"Role of Plasmodium falciparum digestive vacuole plasmepsins in the specificity and antimalarial mode of action of cysteine and aspartic protease inhibitors.","date":"2009","source":"Antimicrobial agents and chemotherapy","url":"https://pubmed.ncbi.nlm.nih.gov/19752273","citation_count":67,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["plasmepsin X"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"36216349","id":"PMC_36216349","title":"Discovery and Characterization of Potent, Efficacious, Orally Available Antimalarial Plasmepsin X Inhibitors and Preclinical Safety Assessment of UCB7362.","date":"2022","source":"Journal of medicinal chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/36216349","citation_count":28,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["PMX","plasmepsin X"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"26911483","id":"PMC_26911483","title":"Plasmodium falciparum ookinete expression of plasmepsin VII and plasmepsin X.","date":"2016","source":"Malaria journal","url":"https://pubmed.ncbi.nlm.nih.gov/26911483","citation_count":27,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["plasmepsin X"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"32098818","id":"PMC_32098818","title":"An Endoplasmic Reticulum CREC Family Protein Regulates the Egress Proteolytic Cascade in Malaria Parasites.","date":"2020","source":"mBio","url":"https://pubmed.ncbi.nlm.nih.gov/32098818","citation_count":27,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["plasmepsin X"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"35460613","id":"PMC_35460613","title":"Basis for drug selectivity of plasmepsin IX and X inhibition in Plasmodium falciparum and vivax.","date":"2022","source":"Structure (London, England : 1993)","url":"https://pubmed.ncbi.nlm.nih.gov/35460613","citation_count":24,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["PMX","plasmepsin X"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"37036362","id":"PMC_37036362","title":"Activation of the Plasmodium Egress Effector Subtilisin-Like Protease 1 Is Mediated by Plasmepsin X Destruction of the Prodomain.","date":"2023","source":"mBio","url":"https://pubmed.ncbi.nlm.nih.gov/37036362","citation_count":19,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["plasmepsin X"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"37072430","id":"PMC_37072430","title":"Plasmepsin X activates the PCRCR complex of Plasmodium falciparum by processing PfRh5 for erythrocyte invasion.","date":"2023","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/37072430","citation_count":17,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["PMX","plasmepsin X"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"35927261","id":"PMC_35927261","title":"Maturation and substrate processing topography of the Plasmodium falciparum invasion/egress protease plasmepsin X.","date":"2022","source":"Nature 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Drugs and drug resistance","url":"https://pubmed.ncbi.nlm.nih.gov/42025246","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["PMX","plasmepsin X"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"36712005","id":"PMC_36712005","title":"Activation of the Plasmodium egress effector subtilisin-like protease 1 is achieved by plasmepsin X destruction of the propiece.","date":"2023","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/36712005","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["plasmepsin X"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"42424440","id":"PMC_42424440","title":"2-Amino-3,4-Dihydroquinazolines Exhibit Potent Antimalarial Activity by Targeting Plasmepsin X.","date":"2026","source":"ACS infectious diseases","url":"https://pubmed.ncbi.nlm.nih.gov/42424440","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["plasmepsin X"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"40901435","id":"PMC_40901435","title":"Unravelling therapeutic potentials of Solanum anomalum fruits: antiplasmodial, hepatoprotective, and anti-oxidative stress activities, semi-purification, GC-MS, and in silico profiling.","date":"2025","source":"Journal of parasitic diseases : official organ of the Indian Society for Parasitology","url":"https://pubmed.ncbi.nlm.nih.gov/40901435","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["plasmepsin X"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":18850,"output_tokens":4748,"usd":0.063885,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":11339,"output_tokens":5209,"usd":0.09346,"stage2_stop_reason":"end_turn"},"total_usd":0.157345,"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\": 2017,\n      \"finding\": \"PMX (PF3D7_0808200) is essential for both erythrocyte egress and invasion in P. falciparum, acting by controlling maturation of the subtilisin-like serine protease SUB1 in exoneme secretory vesicles.\",\n      \"method\": \"Conditional knockdown/genetic ablation combined with cell biological and biochemical analysis of SUB1 maturation\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two independent labs published simultaneously with genetic loss-of-function and biochemical substrate analysis, replicated across two papers\",\n      \"pmids\": [\"29074774\", \"29074775\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Recombinantly expressed PMX cleaves egress and invasion factors in a manner sensitive to the inhibitor compound 49c, establishing PMX as the maturase for microneme proteins including those required for egress.\",\n      \"method\": \"In vitro cleavage assay with recombinant PMX and PMX inhibitor 49c; conditional gene excision\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro enzymatic assay with recombinant protein plus inhibitor sensitivity, combined with conditional genetics, replicated in two simultaneous independent studies\",\n      \"pmids\": [\"29074775\", \"29074774\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PMX is required for the proteolytic maturation of SUB1 in P. falciparum; knockdown of the ER-resident calcium-binding protein PfERC prevents proteolytic maturation of PMX, which in turn prevents SUB1 cleavage, placing PfERC upstream of PMX in the egress proteolytic cascade.\",\n      \"method\": \"Conditional knockdown of PfERC; double-mutant parasite analysis; immunoblot analysis of PMX and SUB1 processing\",\n      \"journal\": \"mBio\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal epistasis using double-mutant parasites with defined biochemical readout (PMX and SUB1 maturation status), single lab but multiple orthogonal genetic approaches\",\n      \"pmids\": [\"32098818\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PMX acts as a master modulator of merozoite invasion by directly maturing proteins required for invasion, parasite development, and egress; dual PMX/PMIX inhibitor WM382 blocks multiple life-cycle stages including asexual blood stage, liver stage, and transmission to mosquitoes.\",\n      \"method\": \"Chemical inhibition with WM382 (dual PMIX/PMX inhibitor); in vivo mouse models (P. berghei and humanized mouse P. falciparum); in vitro selection for resistance\",\n      \"journal\": \"Cell host & microbe\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal in vivo and in vitro approaches across multiple parasite species and life-cycle stages\",\n      \"pmids\": [\"32109369\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}, {\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PMX autoprocesses via self-cleavage at multiple sites to generate different isoforms; a quadruple cleavage-site mutant that remains full-length retains in vitro enzymatic activity and is trafficked normally, supporting normal egress, invasion and parasite growth. The N-terminal half of the prodomain remains bound to the catalytic domain after processing and is required for proper intracellular trafficking of PMX. PMX cleaves microneme and exoneme substrates before their discharge, while rhoptry substrates dependent on PMX are cleaved after exoneme discharge into the parasitophorous vacuole.\",\n      \"method\": \"Site-directed mutagenesis of cleavage sites; in vitro enzymatic assay; parasite transfection; localization studies; biochemical fractionation\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis combined with in vitro assay and parasite genetics, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"35927261\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Crystal structures of PfPMX zymogen reveal a novel inactivation mechanism involving a unique twisted loop from the prosegment and Arg244 from the mature enzyme. Maturation occurs through cleavage of the prosegment at multiple sites. The structure also provides molecular details of inhibitor 49c binding to the active site.\",\n      \"method\": \"X-ray crystallography of PfPMX zymogen and inhibitor-bound forms; active-site mutant analysis\",\n      \"journal\": \"Protein science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure determination with functional validation of inactivation mechanism, single lab but direct structural evidence\",\n      \"pmids\": [\"35048450\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Structures of PMX from P. falciparum and P. vivax bound to inhibitors WM4 and WM382 reveal that PMX and PMIX have similar substrate specificity but distinct differences for peptide and protein substrates; drug selectivity differences between PMIX and PMX map to variations in the S' region and engagement of the S3 pocket.\",\n      \"method\": \"X-ray crystallography; enzyme kinetic assays; substrate specificity profiling\",\n      \"journal\": \"Structure\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structures combined with enzyme kinetic assays, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"35460613\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}, {\"species\": \"Plasmodium vivax\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PMX directly cleaves both the inhibitory prodomain fragment p31 and the p54 intermediate of SUB1 in vitro using recombinant proteins. PMX cleavage of p31 removes the inhibitory propiece, activating SUB1; upon PMX knockdown, the p31-p54 complex accumulates in parasites. The conversion of p54 to p47 by PMX is not required for SUB1 activity once p31 is removed.\",\n      \"method\": \"Recombinant protein cleavage assay; mapping of cleavage sites; PMX conditional knockdown; immunoblot\",\n      \"journal\": \"mBio\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with recombinant proteins plus cleavage site mapping combined with parasite genetic knockdown, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"37036362\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PMX processes the N-terminal prodomain of PfRh5 within micronemes of the PCRCR invasion complex, activating the complex to expose its basigin-binding function required for merozoite invasion of erythrocytes.\",\n      \"method\": \"Biochemical analysis of PCRCR complex processing; conditional PMX manipulation; invasion assays; mass spectrometry\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct biochemical substrate processing assay combined with functional invasion readout, single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"37072430\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PMX protein is expressed in gametes, zygotes, and ookinetes of P. falciparum (mosquito stages), as confirmed by RT-PCR, western blot, and immunofluorescence; antibodies against PMX reduce P. falciparum invasion of the mosquito midgut.\",\n      \"method\": \"RT-PCR; western immunoblot; immunofluorescence assay; standard membrane feeding assay (SMFA)\",\n      \"journal\": \"Malaria journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — protein expression confirmed by multiple methods in mosquito stages, transmission-blocking shown by antibody inhibition in SMFA, but no direct genetic knockout\",\n      \"pmids\": [\"26911483\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PMX-mediated cleavage of the SUB1 prodomain (p31) activates SUB1 enzyme activity; p31 and the p31-p54 complex are largely dimeric under acidic conditions where PMX acts; PMX cleavage of p31 causes rapid loss of its inhibitory capacity and directly activates SUB1; the order of PMX cleavage sites on p31 was determined.\",\n      \"method\": \"Biochemical and enzymatic analysis; recombinant protein assays; dimerization analysis\",\n      \"journal\": \"Biochimica et biophysica acta. General subjects\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro reconstitution with recombinant proteins and activity assay, single lab, largely confirmatory of prior findings with additional mechanistic detail\",\n      \"pmids\": [\"38969256\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PMX processes the SUB1 prodomain within acidic secretory organelles; this processing is required for full SUB1 activation upon discharge into the parasitophorous vacuole at neutral pH, where the Sub1 prodomain mediates pH-dependent dimerization and autoinhibition.\",\n      \"method\": \"Crystal structure of full-length PfSub1; structural, biochemical, and biophysical studies including dimerization analysis\",\n      \"journal\": \"mBio\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — crystal structure of Sub1 combined with biochemical studies placing PMX action in acidic organelles, but PMX itself was not the experimental subject; finding is about PMX's role as inferred from Sub1 biology\",\n      \"pmids\": [\"38386597\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PMX has a substrate consensus cleavage motif SFhE (h = hydrophobic amino acid); PMX prefers Phe in the P1 position, di-substitution at the β-carbon of the P2 moiety, and a hydrophobic P3 group, as established by peptidomimetic inhibitor structure-activity analysis and modeling.\",\n      \"method\": \"Enzymatic inhibition assays with peptidomimetics; substrate processing assays; molecular modelling\",\n      \"journal\": \"ChemMedChem\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — enzymatic assay defining substrate specificity with structure-activity analysis, single lab but biochemical and cellular validation\",\n      \"pmids\": [\"35906744\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"A P. falciparum line overexpressing PMX showed fourfold reduced susceptibility to the diphenylurea compound GB-III-32, suggesting PMX is an alternative target for certain aspartic protease inhibitors that act early in the intraerythrocytic life cycle.\",\n      \"method\": \"Overexpression of PMX; drug susceptibility assay (IC50 comparison)\",\n      \"journal\": \"Antimicrobial agents and chemotherapy\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single overexpression experiment with IC50 shift, single lab, indirect inference about target identity\",\n      \"pmids\": [\"19752273\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"HIV-1 protease inhibitors ritonavir (RTV) and lopinavir (LPV) inhibit PMX enzymatic activity; RTV binds to the PMX active site as shown by inhibition assay, representing the first report of PMX inhibition by an HIV-1 protease inhibitor.\",\n      \"method\": \"Enzymatic inhibition assay with recombinant PMX; crystal structure of PMII-drug complexes (structural inference for PMX active site)\",\n      \"journal\": \"Current research in structural biology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — enzymatic inhibition assay for PMX, but crystal structure solved only for PMII not PMX; single lab, single method for PMX\",\n      \"pmids\": [\"38304146\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Crystal structure of PMX bound to macrocyclic peptidomimetic inhibitor 7k at 1.7 Å reveals PMX adopts a novel conformation upon 7k binding, involving significant movement of the S2'S2 loop and S2 flap leading to partial active site closure; catalytic aspartates D266 and D467 directly interact with the hydroxyethylamine pharmacophore.\",\n      \"method\": \"X-ray crystallography at 1.7 Å; molecular docking\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — high-resolution crystal structure with direct identification of catalytic residue interactions, single lab\",\n      \"pmids\": [\"40043835\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"A 2-piperazino-pyrimidine compound (FPSA) targets PMX in P. falciparum: resistant parasite selection identified SNVs (I252V or E55G) and gene duplications in the PMX-encoding locus; genome-edited parasites with these substitutions showed reduced FPSA susceptibility; FPSA inhibited recombinant PMX proteolytic activity in vitro and blocked PMX substrate processing in parasites.\",\n      \"method\": \"Forward genetics (resistant parasite selection and whole-genome sequencing); CRISPR genome editing; in vitro enzymatic assay with recombinant PMX; substrate processing assay in parasites; transcriptomics\",\n      \"journal\": \"International journal for parasitology. Drugs and drug resistance\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal approaches (forward genetics, genome editing, in vitro enzymatic assay, cellular substrate processing), single lab\",\n      \"pmids\": [\"42025246\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"Dd2\"}]\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Preprint version: PMX directly cleaves both p31 and p54 of SUB1 using recombinant proteins; cleavage sites on p31 were mapped; p54 is fully functional once p31 is removed, demonstrating that conversion to p47 is dispensable for SUB1 activity. Heterologous protease-mediated relief of propiece inhibition is established as the mechanism for PMX-dependent SUB1 activation.\",\n      \"method\": \"Recombinant protein cleavage assay; cleavage site mapping; conditional PMX knockdown; immunoblot\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — preprint version of subsequently peer-reviewed work (PMID 37036362); in vitro reconstitution with recombinant proteins, single lab\",\n      \"pmids\": [\"36712005\"],\n      \"is_preprint\": true,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"current_model\": \"PMX (PF3D7_0808200) is an essential aspartic protease in Plasmodium falciparum that functions as a master maturase in the egress/invasion proteolytic cascade: it is activated from its zymogen form (via a novel prosegment inactivation mechanism involving a twisted loop and Arg244) in acidic secretory organelles under control of the upstream ER-resident regulator PfERC, then cleaves microneme and exoneme substrates (including the SUB1 prodomain p31 to activate the effector protease SUB1, and the PfRh5/PCRCR complex to enable basigin binding) prior to their discharge, while cleaving rhoptry substrates after exoneme discharge into the parasitophorous vacuole, collectively controlling merozoite egress and erythrocyte invasion across multiple life-cycle stages.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PMX (PF3D7_0808200) is an essential Plasmodium falciparum aspartic protease that acts as a master maturase governing the proteolytic cascade underlying merozoite egress from and invasion of erythrocytes [#0, #3]. Functioning within acidic secretory organelles, PMX cleaves microneme and exoneme substrates prior to their discharge, while PMX-dependent rhoptry substrates are processed only after exoneme discharge into the parasitophorous vacuole [#4]. A central substrate is the subtilisin-like protease SUB1: PMX directly removes SUB1's inhibitory prodomain fragment p31, relieving propiece autoinhibition and activating SUB1, whereas the further conversion of the p54 intermediate to p47 is dispensable for activity [#7]. PMX also processes the N-terminal prodomain of PfRh5 within micronemes of the PCRCR complex, exposing its basigin-binding function required for invasion, establishing PMX as a hub coordinating both egress and invasion effectors [#8]. PMX activity is controlled upstream by the ER-resident calcium-binding protein PfERC, whose knockdown blocks proteolytic maturation of PMX and consequently SUB1 cleavage [#2]. Structurally, the PMX zymogen is held inactive by a unique twisted prosegment loop engaging Arg244, and maturation proceeds through prosegment cleavage; the catalytic aspartates D266 and D467 form the active site, and PMX recognizes an SFhE consensus motif favoring Phe at P1 [#5, #15, #12]. PMX is a validated antimalarial drug target: inhibitors including 49c, the dual PMIX/PMX inhibitor WM382, and a 2-piperazino-pyrimidine (FPSA) block its enzymatic and substrate-processing activity, with WM382 active across asexual blood, liver, and transmission stages, and resistance mapping to substitutions in the PMX locus [#1, #3, #16].\",\n  \"teleology\": [\n    {\n      \"year\": 2016,\n      \"claim\": \"Before its egress/invasion role was defined, it was unknown whether PMX is expressed and functional in mosquito stages; detection in gametes, zygotes and ookinetes with antibody-mediated blockade of midgut invasion established a transmission-stage role.\",\n      \"evidence\": \"RT-PCR, western blot, immunofluorescence, and standard membrane feeding assay in P. falciparum mosquito stages\",\n      \"pmids\": [\"26911483\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct genetic knockout of PMX in mosquito stages\", \"Substrates in gametes/zygotes/ookinetes not identified\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"The essential function of PMX in the blood stage was unknown; conditional genetics plus recombinant enzyme assays established PMX as an essential protease controlling SUB1 maturation and cleaving microneme egress/invasion factors.\",\n      \"evidence\": \"Conditional knockdown/gene excision and in vitro cleavage assays with recombinant PMX and inhibitor 49c, in two simultaneous P. falciparum studies\",\n      \"pmids\": [\"29074774\", \"29074775\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full substrate repertoire not enumerated\", \"Mechanism of PMX zymogen activation not resolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"How PMX itself is regulated was unknown; epistasis placed the ER-resident calcium-binding protein PfERC upstream of PMX maturation, linking PMX activation to secretory-organelle regulation.\",\n      \"evidence\": \"Conditional knockdown of PfERC and double-mutant immunoblot analysis of PMX and SUB1 processing in P. falciparum\",\n      \"pmids\": [\"32098818\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular mechanism by which PfERC controls PMX maturation not defined\", \"Whether PfERC acts on PMX directly or via other factors unresolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"The breadth of PMX's role across the life cycle and its druggability were unknown; a dual PMIX/PMX inhibitor demonstrated PMX matures invasion, development and egress proteins and blocks asexual, liver and transmission stages.\",\n      \"evidence\": \"Chemical inhibition with WM382, in vivo P. berghei and humanized-mouse P. falciparum models, and in vitro resistance selection\",\n      \"pmids\": [\"32109369\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Inhibitor targets both PMIX and PMX, so PMX-specific contributions per stage not fully separated\", \"Individual stage-specific substrates not mapped\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}, {\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"The structural basis for PMX zymogen inactivation and inhibitor binding was unknown; crystal structures revealed a novel prosegment twisted loop engaging Arg244 and defined the active-site inhibitor interactions.\",\n      \"evidence\": \"X-ray crystallography of PfPMX zymogen and inhibitor-bound forms with active-site mutant analysis\",\n      \"pmids\": [\"35048450\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of the fully mature enzyme with a physiological substrate not captured\", \"Dynamics of activation in vivo not observed\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Whether PMX autoprocessing and prodomain retention are required for function was unknown; a non-cleavable full-length mutant retained activity and normal trafficking, while the N-terminal prodomain half was shown necessary for trafficking, and the timing of substrate cleavage relative to discharge was defined.\",\n      \"evidence\": \"Site-directed cleavage-site mutagenesis, in vitro enzymatic assay, parasite transfection, localization and fractionation in P. falciparum\",\n      \"pmids\": [\"35927261\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional significance of the multiple autoprocessed isoforms unclear\", \"Trafficking receptor/machinery engaging the prodomain not identified\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Determinants of PMX substrate specificity and selectivity versus PMIX were unknown; kinetic and structural profiling defined an SFhE consensus motif and mapped drug selectivity to the S' and S3 regions.\",\n      \"evidence\": \"X-ray crystallography of P. falciparum and P. vivax PMX with WM4/WM382, enzyme kinetics, peptidomimetic SAR and substrate profiling\",\n      \"pmids\": [\"35460613\", \"35906744\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Native protein substrate cleavage sites not all validated against the consensus\", \"In-parasite specificity determinants not tested by mutagenesis\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}, {\"species\": \"Plasmodium vivax\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"The precise mechanism of PMX-dependent SUB1 activation was unknown; direct cleavage of the p31 inhibitory prodomain (not the p54-to-p47 conversion) was shown to relieve propiece inhibition and activate SUB1.\",\n      \"evidence\": \"Recombinant protein cleavage assays with site mapping and PMX conditional knockdown/immunoblot in P. falciparum (peer-reviewed, preceded by bioRxiv preprint)\",\n      \"pmids\": [\"37036362\", \"36712005\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinetics of p31 removal in vivo not quantified\", \"Whether other cofactors modulate this activation not addressed\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Beyond SUB1, whether PMX activates invasion-complex ligands was unknown; PMX was shown to process the PfRh5 N-terminal prodomain within micronemes of the PCRCR complex to expose basigin binding.\",\n      \"evidence\": \"Biochemical PCRCR processing analysis, conditional PMX manipulation, mass spectrometry and invasion assays in P. falciparum\",\n      \"pmids\": [\"37072430\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinetic ordering of PfRh5 versus SUB1 processing not defined\", \"Other PCRCR component processing events not fully mapped\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"The physicochemical context of SUB1 prodomain inhibition and its relief was unclear; work showed p31 acts as a pH-dependent dimeric autoinhibitor cleaved by PMX in acidic organelles, with SUB1 fully activated upon neutral-pH discharge.\",\n      \"evidence\": \"Crystal structure of full-length PfSub1, recombinant protein activity and dimerization assays inferring PMX's acidic-organelle action in P. falciparum\",\n      \"pmids\": [\"38969256\", \"38386597\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"PMX itself was not the direct experimental subject in the Sub1 structural work\", \"Behavior of PMX under the same pH transitions not directly measured\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"High-resolution definition of the PMX active site engaging an inhibitor was lacking; a 1.7 Å structure revealed catalytic aspartates D266/D467 contacting the hydroxyethylamine pharmacophore and a novel closure conformation of the S2'/S2 loop and S2 flap.\",\n      \"evidence\": \"X-ray crystallography of PMX bound to macrocyclic peptidomimetic 7k with molecular docking\",\n      \"pmids\": [\"40043835\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Conformational flexibility during catalysis of native substrates not resolved\", \"Generalizability of the closure conformation to other inhibitor classes unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Whether new chemotypes engage PMX directly and how resistance arises was unknown; a 2-piperazino-pyrimidine (FPSA) was shown to inhibit recombinant PMX and block substrate processing, with resistance mapping to PMX-locus substitutions and duplications.\",\n      \"evidence\": \"Resistant-parasite selection with whole-genome sequencing, CRISPR editing, in vitro enzymatic assay and cellular substrate processing in P. falciparum Dd2\",\n      \"pmids\": [\"42025246\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of I252V/E55G-mediated resistance not resolved\", \"Contribution of gene duplication versus point mutation to resistance not dissected\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"Dd2\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The complete PMX substrate repertoire across all life-cycle stages and the direct molecular mechanism linking PfERC to PMX zymogen maturation remain undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Full census of PMX substrates beyond SUB1 and PfRh5/PCRCR not established\", \"Direct biochemical link between PfERC and PMX activation unresolved\", \"Stage-specific mosquito-stage substrates uncharacterized\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0004190\", \"supporting_discovery_ids\": [1, 4, 5, 7, 8, 15, 16]},\n      {\"term_id\": \"GO:0008233\", \"supporting_discovery_ids\": [0, 12]},\n      {\"term_id\": \"GO:0016485\", \"supporting_discovery_ids\": [0, 7, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0070005\", \"supporting_discovery_ids\": [4, 11]},\n      {\"term_id\": \"GO:0033644\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0006508\", \"supporting_discovery_ids\": [0, 7, 8]},\n      {\"term_id\": \"GO:0044409\", \"supporting_discovery_ids\": [0, 3, 8]}\n    ],\n    \"complexes\": [\n      \"PMX processes the PfRh5/PCRCR invasion complex (substrate, not a component) [#8]\"\n    ],\n    \"partners\": [\n      \"SUB1 (subtilisin-like protease; substrate — p31 prodomain removal activates SUB1) [#0, #7, #10]\",\n      \"PfRh5 / PCRCR complex (substrate — prodomain processing exposes basigin binding) [#8]\",\n      \"PfERC (ER-resident calcium-binding protein; upstream regulator of PMX maturation) [#2]\"\n    ],\n    \"other_free_text\": [\n      \"Zymogen inactivation via a unique twisted prosegment loop and Arg244; maturation by prosegment cleavage at multiple sites [#5]\",\n      \"Autoprocesses at multiple self-cleavage sites into distinct isoforms; N-terminal prodomain half stays bound and is required for trafficking [#4]\",\n      \"Catalytic aspartates D266 and D467 form the active site [#15]\",\n      \"Substrate consensus motif SFhE (Phe preferred at P1) [#12]\",\n      \"Validated antimalarial drug target inhibited by 49c, WM382/WM4, ritonavir/lopinavir, and FPSA; resistance maps to PMX-locus I252V/E55G and gene duplication [#1, #3, #6, #14, #16]\",\n      \"Expressed and functional in mosquito stages (gametes, zygotes, ookinetes); antibodies reduce midgut invasion [#9]\"\n    ]\n  }\n}","audit_flag":null,"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_0808200","name":null,"product":"plasmepsin X","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PbANKA","gene_id":"PBANKA_1222500","name":null,"product":"plasmepsin X, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_0110500","name":null,"product":"plasmepsin X, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"PMX","evaluation":null}