{"gene":"PF3D7_1323500","run_date":"2026-09-08T14:19:06","timeline":{"discoveries":[{"year":2005,"finding":"PMV (PF3D7_1323500) is an integral membrane protein resident in the endoplasmic reticulum of P. falciparum intraerythrocytic parasites, but not in ERD2-associated Golgi structures; it is expressed throughout asexual development with lowest levels at ring stage; the proregion appears not to be removed following biosynthesis; and unlike food-vacuole plasmepsins, detergent-solubilized PMV does not bind pepstatin A, indicating a distinct function.","method":"Subcellular fractionation, solubilization experiments, immunofluorescence microscopy, pepstatin-binding assay","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct fractionation and localization experiments with functional inference; single lab, multiple orthogonal methods","pmids":["16024107"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2010,"finding":"PMV is the aspartic acid protease responsible for proteolytic cleavage of the PEXEL/HT motif (RxLxE/Q/D) in the parasite endoplasmic reticulum; PMV cleavage exposes the xE/Q/D residues as the new N-terminus of cargo proteins, which is required for their export into the host erythrocyte; expression of a mature protein with xQ at the N-terminus generated by signal peptidase was not exported, demonstrating that PMV activity is essential and coupled with downstream export events.","method":"Transgenic P. falciparum expressing chimeric exported proteins, mass spectrometry identification of cleavage products, signal-peptidase-generated N-terminus control experiment","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — two independent simultaneous publications with multiple orthogonal methods; replicated across labs (PMID 20130643 and 20130644)","pmids":["20130643","20130644"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2010,"finding":"PMV is an ER-resident aspartic protease with distant homology to mammalian BACE; it recognizes the PEXEL motif and cleaves it at the correct site (after P1 Leu); ER residence is essential for its function, as mislocalization abolishes PEXEL processing.","method":"Conditional mislocalization of PMV, in-parasite cleavage assays, sequence homology analysis","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct functional localization experiment with mechanistic consequence, replicated by simultaneous independent publication","pmids":["20130644"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2013,"finding":"PMV cleaves N-terminal sequences from RIFIN, STEVOR, and RESA multigene family proteins (the latter containing a relaxed PEXEL, RxLxxE); however, PMV does not cleave PfEMP1 or PEXEL-negative exported proteins SBP-1 or REX-2; lysine at the PEXEL P3 position (present in PfEMP1) blocks PMV activity, and isoleucine at P1 also blocks PMV activity, defining the exquisitely confined substrate specificity of PMV.","method":"In vitro cleavage assays with recombinant PMV and peptide substrates, transgenic parasite expression of chimeric proteins","journal":"Traffic (Copenhagen, Denmark)","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro cleavage assay with substrate mutagenesis combined with parasite transgenic validation; single lab but two orthogonal methods","pmids":["23387285"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2014,"finding":"PMV cleaves the PEXEL motif co-translationally, similar to signal peptidase; pharmacological inhibition of PMV with a PEXEL-mimetic inhibitor causes dose-dependent inhibition of PEXEL processing, blocks protein export including PfEMP1 display on the erythrocyte surface, impairs cytoadherence, and kills parasites at the trophozoite stage; knockdown of PMV enhanced inhibitor sensitivity and overexpression conferred resistance, providing direct evidence that PMV activity is essential for protein export and parasite survival.","method":"PEXEL-mimetic inhibitor treatment, PMV knockdown and overexpression in P. falciparum, PEXEL cleavage assays, flow cytometry for surface PfEMP1, parasite growth assays","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods including knockdown, overexpression, and pharmacological inhibition with clear mechanistic readouts; single lab","pmids":["24983235"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2015,"finding":"The crystal structure of P. vivax PMV in complex with the PEXEL-mimetic inhibitor WEHI-842 was solved to 2.4-Å resolution, revealing a plant-like fold and a malaria-specific helix-turn-helix motif near the C-terminus that are important for substrate cleavage; the structure explains the strict substrate and inhibitor binding requirements of the enzyme.","method":"X-ray crystallography (2.4-Å resolution), biochemical inhibition assays, parasite growth assays","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — atomic-resolution crystal structure with functional inhibitor validation; single lab but structure plus biochemistry","pmids":["26214367"],"is_preprint":false,"attribution":[{"species":"Plasmodium vivax","strain":""}]},{"year":2015,"finding":"The catalytic protease domain of PMV faces the endoplasmic reticulum lumen, as determined by self-associating split-GFP topology assay, supporting the model that PEXEL/HT motif cleavage and N-α-acetylation occur in the ER lumen and indicating that cytosolic N-α-acetyltransferases are not candidates for the modification.","method":"Split-GFP complementation topology assay in P. falciparum","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct topological experiment in parasite with functional inference; single lab, single method","pmids":["25849462"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2016,"finding":"PEXEL processing by PMV occurs co-translationally and is independent of PI(3)P binding; repositioning the PEXEL motif close to the signal sequence in KAHRP prevented PMV cleavage and abolished export, even though the protein retained putative PI(3)P-binding residues; restoring the PEXEL to its original location rescued PMV processing and export, demonstrating that PEXEL position relative to the signal sequence is conserved for co-translational cleavage by PMV.","method":"Transgenic P. falciparum expressing PEXEL-repositioned KAHRP constructs, PEXEL cleavage assays, export assays, ER lipid staining","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — epistatic transgenic experiment with multiple constructs; directly refutes an alternative PI(3)P mechanism; single lab, multiple constructs and orthogonal readouts","pmids":["26832821"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2014,"finding":"Recombinant PMV zymogen is enzymatically active; the prosegment is non-essential for refolding or inhibition; mature PMV shows a pH optimum of 5.5–7.0 with Km = 4.6 µM and kcat = 0.24 s⁻¹ at pH 6.0 using a DABCYL-LNKRLLHETQ-E(EDANS) fluorogenic substrate; both zymogen and mature forms are partially inhibited by pepstatin A and certain KNI inhibitors but strongly inhibited by certain metals.","method":"Recombinant bacterial expression and refolding, in vitro fluorogenic substrate cleavage assay, kinetic characterization","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro enzymatic reconstitution with kinetic parameters; single lab, single study","pmids":["25447707"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2018,"finding":"PMV is expressed and active in P. falciparum stage I–II gametocytes; PMV inhibitors block PEXEL processing and export of gametocyte effector proteins, inhibit gametocyte development from stage II–V, and sublethal inhibitor concentrations produce stage V gametocytes that fail to infect mosquitoes, demonstrating that PMV-dependent protein export is essential for gametocyte development and transmission competence.","method":"PMV inhibitor treatment of gametocyte cultures, PEXEL cleavage assays, gametocyte stage progression assays, mosquito infection assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — pharmacological inhibition with multiple functional readouts across gametocyte stages and transmission; single lab, multiple orthogonal assays","pmids":["31851913"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2018,"finding":"PMV is an essential gene for P. falciparum asexual blood-stage viability; conditional gene excision using CRISPR-Cas9 combined with DiCre-mediated recombination inactivated the pfpmv gene, causing severe growth defects and developmental arrest early in the ring-to-trophozoite transition, demonstrating that PMV is essential for parasite viability.","method":"CRISPR-Cas9 gene editing combined with DiCre conditional excision, parasite growth assays, phenotypic analysis of ring-to-trophozoite development","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Moderate — definitive conditional genetic knockout with clear phenotypic readout; replicates and extends prior pharmacological essentiality evidence","pmids":["30517136"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2020,"finding":"Stringent post-transcriptional knockdown of PMV using a regulatable system reveals that PMV must be dramatically depleted to affect parasite growth, indicating the parasite maintains PMV in substantial excess; depletion arrests parasite growth immediately after red blood cell invasion, prior to the death caused by exported protein deficit, suggesting PMV inhibitors can halt parasite growth at two distinct points in the life cycle.","method":"Post-transcriptional regulatable knockdown system (TetR-DOZI), parasite growth and invasion assays, PEXEL processing assays","journal":"ACS infectious diseases","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — quantitative tunable knockdown with multiple growth-stage readouts; single lab","pmids":["32069391"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2022,"finding":"The nepenthesin 1-type insert unique to PMV is essential for parasite growth and PMV activity; mutagenesis of the insert's amino acid sequence or disruption of one of its two disulfide bonds abolishes PMV function and fails to rescue lethal PMV depletion; molecular dynamics and Markov state modeling suggest the insert allosterically affects PMV catalysis.","method":"Parasite genetics (lethal PMV depletion rescue with mutant enzymes), site-directed mutagenesis of the nepenthesin insert, molecular dynamics simulations with Markov state modeling","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in-parasite mutagenesis rescue assay combined with structural modeling; single lab but parasite genetics + mutagenesis + MD","pmids":["35952758"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2024,"finding":"PMV processes PEXEL motifs in non-exported proteins in addition to exported ones; the parasitophorous vacuole protein UIS2 and other non-exported rhoptry proteins contain bona fide PEXEL motifs that are cleaved by PMV in P. falciparum blood stages; an aspartic acid at the P1' position of the UIS2 PEXEL is permissive for PMV cleavage but blocks export, and mutation of this residue to alanine enables export, demonstrating that features of the mature N-terminus rather than PEXEL cleavage per se determine export.","method":"Chimeric reporter fusions expressed in P. falciparum, N-terminal sequencing/mass spectrometry of cleavage products, site-directed mutagenesis of P1' position","journal":"mSphere","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in-parasite reporter assays with site-directed mutagenesis and biochemical verification; single lab, multiple orthogonal approaches","pmids":["38334391"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2023,"finding":"PMV processes a non-exported parasitophorous vacuole substrate (UIS2), demonstrating that PMV functions as a more general secretory maturase beyond its established role in marking proteins for export; the identity of residues downstream of the cleavage site controls export fate independently of PMV processing.","method":"Chimeric reporter fusions, parasite expression and localization assays (preprint version of the same findings reported in PMID 38334391)","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — preprint superseded by peer-reviewed PMID 38334391; included for completeness but lower weight as preprint","pmids":["37503245"],"is_preprint":true,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2019,"finding":"Recombinant PfPMV catalytic residues D118 and D365 are both required for activity; mutation of D365 has more pronounced effects on catalytic efficiency than D118, suggesting D365 acts as the catalytic nucleophile that activates the water molecule; the unpaired cysteine C178 is partially involved in substrate recognition, as its modification by metal ions reduces activity.","method":"Site-directed mutagenesis (D118N, D365N, C178 substitution) of recombinant PfPMV, fluorogenic substrate kinetic assays","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro mutagenesis with kinetic readout; single lab, single study","pmids":["31108131"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2016,"finding":"Substrate specificity studies with recombinant PfPMV show that substitution of Ser with Val or Glu at the P1' position reduces enzyme activity by 75%, and substitution of Ile with Lys or Glu at the P2 position reduces cleavage efficiency by 30%; PfPMV activity is inhibited by PMSF and nelfinavir but not pepstatin A; the P1' and P2 positions of PEXEL substrates are key determinants of PMV catalytic efficiency.","method":"Recombinant PfPMV in vitro fluorogenic substrate cleavage assays with PEXEL peptide variants, inhibitor assays","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro substrate mutagenesis with kinetic readout; single lab","pmids":["25986559"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2016,"finding":"Biochemical characterization of P. vivax PMV (Thailand isolate) shows it cleaves PfEMP2-derived peptides more efficiently than HRPII peptides; substitution at P1' Ser to Val or Glu markedly reduces PvPMV activity (as for PfPMV), whereas substitution at P2 with Glu reduces cleavage efficiency by 80% in PvPMV versus only 30% in PfPMV, indicating subtle differences in the S2 binding pocket between species; a four-amino-acid insertion (SVSE at residues 246–249 in PvPMV-Thai) does not interfere with catalytic activity.","method":"Recombinant PvPMV expression and refolding, fluorogenic substrate cleavage assays with peptide variants, inhibitor assays","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro biochemical characterization; single lab","pmids":["26795263"],"is_preprint":false,"attribution":[{"species":"Plasmodium vivax","strain":"Thai isolate"}]},{"year":2025,"finding":"Chemoproteomic approaches (solvent-induced protein precipitation and intact-cell thermal profiling) demonstrate direct target engagement of peptidomimetic inhibitors with PMV in P. falciparum parasites; whole-genome sequencing of parasites with reduced peptidomimetic sensitivity revealed a single nucleotide variant within the pmv gene, and reverse genetics validated this mutation as mediating resistance, confirming that the antimalarial activity of peptidomimetics is exerted by directly targeting PMV.","method":"Solvent-induced protein precipitation, intact-cell thermal profiling (chemoproteomics), whole-genome sequencing, reverse genetics (CRISPR-validated mutation)","journal":"ACS infectious diseases","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal chemoproteomic methods plus reverse genetic validation; single lab","pmids":["41329554"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2025,"finding":"X-ray structures of IPF scaffold compounds in complex with PMV (P. vivax) provided structural insights into their binding mode at the active site, revealing avenues to differentially modulate inhibition of PMV versus the related protease plasmepsin X through modifications to the P1 biaryl region.","method":"X-ray crystallography of PvPMV-inhibitor complexes, biochemical inhibition assays (PMV and PMX), parasite growth assays","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — crystal structure with biochemical validation; single lab","pmids":["40035447"],"is_preprint":false,"attribution":[{"species":"Plasmodium vivax","strain":""}]}],"current_model":"PMV (PF3D7_1323500) is an ER-resident integral membrane aspartic protease whose luminal catalytic domain co-translationally cleaves the PEXEL motif (RxLxE/Q/D) after the P1 Leu residue of hundreds of exported and some non-exported parasite proteins; this processing—dependent on the P3 Arg, P1 Leu, P2 position, and the P1' residue of substrates, and structurally supported by a unique plant-like fold with a nepenthesin insert and helix-turn-helix motif—exposes a mature N-terminus required for downstream translocation into the host erythrocyte; PMV is absolutely essential for asexual parasite survival (genetic knockout arrests parasites at ring-to-trophozoite transition) and for gametocyte development and mosquito transmission, making it a validated antimalarial drug target."},"narrative":{"mechanistic_narrative":"PMV (PF3D7_1323500) is an endoplasmic reticulum-resident aspartic protease that acts as the central maturase of the malaria protein export pathway, co-translationally cleaving the PEXEL/HT motif (RxLxE/Q/D) after the P1 leucine to generate the mature N-terminus required for translocation of cargo into the host erythrocyte [PMID:20130643, PMID:20130644, PMID:24983235]. Its catalytic protease domain faces the ER lumen [PMID:25849462], and correct ER residence is itself essential for activity, since mislocalization abolishes PEXEL processing [PMID:20130644]. Substrate recognition is exquisitely confined: a P3 arginine and P1 leucine are required, lysine at P3 (as in PfEMP1) or isoleucine at P1 blocks cleavage, and the P1' and P2 residues tune catalytic efficiency—so that PMV processes RIFIN, STEVOR and RESA family proteins but not PfEMP1 or PEXEL-negative exported proteins [PMID:23387285, PMID:25986559]. PMV also processes bona fide PEXEL motifs in non-exported proteins such as the parasitophorous vacuole protein UIS2, establishing that it is a more general secretory maturase and that residues of the mature N-terminus (e.g. a P1' aspartate) rather than cleavage per se determine export fate [PMID:38334391]. Structurally, PMV adopts a plant-like fold with a malaria-specific helix-turn-helix motif and a unique nepenthesin-1 insert that is essential for activity and allosterically influences catalysis [PMID:26214367, PMID:35952758], with catalytic aspartates D118 and D365 required for turnover [PMID:31108131]. PMV is essential for asexual blood-stage viability—conditional knockout arrests parasites at the ring-to-trophozoite transition [PMID:30517136]—and for gametocyte development and mosquito transmission [PMID:31851913], and pharmacological inhibition blocks export, impairs cytoadherence and kills parasites, validating PMV as a directly engaged antimalarial drug target [PMID:24983235, PMID:41329554].","teleology":[{"year":2005,"claim":"Establishing that PMV is an ER-resident integral membrane protein distinct from food-vacuole plasmepsins framed it as an enzyme with an unusual, non-degradative function in the secretory pathway.","evidence":"Subcellular fractionation, immunofluorescence, and pepstatin-binding assays in P. falciparum intraerythrocytic parasites","pmids":["16024107"],"confidence":"Medium","gaps":["Substrate and catalytic function not yet identified","Failure to bind pepstatin A left the enzymatic activity unexplained"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2010,"claim":"Identifying PMV as the protease that cleaves the PEXEL/HT motif in the ER answered how exported proteins are marked for delivery to the host cell, defining PMV's core biological role.","evidence":"Transgenic chimeric export reporters, mass spectrometry of cleavage products, and conditional mislocalization in P. falciparum, with signal-peptidase N-terminus control","pmids":["20130643","20130644"],"confidence":"High","gaps":["Full substrate repertoire not defined","Mechanism coupling cleavage to translocation unresolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2013,"claim":"Mapping which family proteins are and are not cleaved defined PMV's confined substrate specificity and explained why some exported proteins bypass PEXEL processing.","evidence":"In vitro cleavage assays with recombinant PMV and peptide substrates plus transgenic chimeric expression in P. falciparum","pmids":["23387285"],"confidence":"High","gaps":["Rules for PEXEL-negative export not established","Structural basis of specificity not yet resolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2014,"claim":"Pharmacological inhibition plus knockdown/overexpression demonstrated that PMV activity is causally required for protein export, cytoadherence and parasite survival, validating it as a drug target.","evidence":"PEXEL-mimetic inhibitor treatment, PMV knockdown and overexpression, PfEMP1 surface flow cytometry, and growth assays in P. falciparum","pmids":["24983235"],"confidence":"High","gaps":["Whether all lethality stems from export failure vs other roles unclear","Resistance mechanisms not yet mapped"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2014,"claim":"In vitro reconstitution of recombinant PMV with kinetic parameters showed the enzyme is active without prosegment removal and clarified its pH optimum and inhibitor profile.","evidence":"Recombinant bacterial expression/refolding and fluorogenic substrate kinetics","pmids":["25447707"],"confidence":"Medium","gaps":["Recombinant kinetics may not reflect the membrane-embedded ER enzyme","Single-lab characterization"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2015,"claim":"The crystal structure of P. vivax PMV revealed a plant-like fold and a malaria-specific helix-turn-helix motif, explaining strict substrate and inhibitor binding requirements.","evidence":"X-ray crystallography at 2.4 Å with a PEXEL-mimetic inhibitor plus biochemical and growth assays","pmids":["26214367"],"confidence":"High","gaps":["Structure is of the P. vivax ortholog","Conformational dynamics during catalysis not captured"],"attribution":[{"species":"Plasmodium vivax","strain":""}]},{"year":2015,"claim":"Topology mapping placed the catalytic domain in the ER lumen, localizing PEXEL cleavage and N-acetylation to the luminal compartment and excluding cytosolic acetyltransferases.","evidence":"Self-associating split-GFP topology assay in P. falciparum","pmids":["25849462"],"confidence":"Medium","gaps":["Single method, single lab","Identity of the responsible N-acetyltransferase not established"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2016,"claim":"Systematic peptide-variant kinetics quantified how P1' and P2 residues govern cleavage efficiency, refining the substrate rules across P. falciparum and P. vivax orthologs.","evidence":"Recombinant PfPMV and PvPMV fluorogenic substrate assays with PEXEL peptide variants and inhibitor testing","pmids":["25986559","26795263"],"confidence":"Medium","gaps":["In vitro peptide efficiencies may not predict in-cell substrate selection","S2 pocket differences between species not structurally resolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium vivax","strain":"Thai isolate"}]},{"year":2016,"claim":"Repositioning the PEXEL motif in KAHRP showed that cleavage is co-translational and depends on PEXEL position relative to the signal sequence, refuting a PI(3)P-based export model.","evidence":"Transgenic P. falciparum expressing PEXEL-repositioned KAHRP constructs with cleavage, export, and ER lipid staining readouts","pmids":["26832821"],"confidence":"High","gaps":["Molecular timing of co-translational recognition not directly visualized","Applicability to all substrates untested"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2018,"claim":"Conditional CRISPR/DiCre knockout gave definitive genetic proof that PMV is essential for asexual viability, pinpointing developmental arrest at the ring-to-trophozoite transition.","evidence":"CRISPR-Cas9 with DiCre conditional excision, growth and phenotypic analysis in P. falciparum","pmids":["30517136"],"confidence":"High","gaps":["Precise molecular cause of arrest not dissected","Whether death is solely export-dependent unresolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2018,"claim":"Extending PMV's role to gametocytes showed that PMV-dependent export is required for gametocyte development and transmission competence, broadening its target relevance.","evidence":"PMV inhibitor treatment of gametocyte cultures with cleavage, stage-progression, and mosquito infection assays in P. falciparum","pmids":["31851913"],"confidence":"High","gaps":["Specific gametocyte substrates driving the phenotype not fully catalogued","Reliance on pharmacological rather than genetic ablation in sexual stages"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2019,"claim":"Mutagenesis of catalytic residues confirmed D118 and D365 as required for activity, with D365 implicated as the catalytic nucleophile and C178 in substrate recognition.","evidence":"Site-directed mutagenesis of recombinant PfPMV with fluorogenic substrate kinetics","pmids":["31108131"],"confidence":"Medium","gaps":["Assignment of nucleophile role is inferential from kinetics","Role of C178 not structurally confirmed"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2020,"claim":"Tunable knockdown revealed PMV is maintained in large excess and that severe depletion arrests growth immediately after invasion, before export-deficit death, implying two distinct points of vulnerability.","evidence":"TetR-DOZI regulatable knockdown with growth, invasion, and PEXEL processing assays in P. falciparum","pmids":["32069391"],"confidence":"Medium","gaps":["Molecular basis of the early post-invasion arrest unidentified","Substrates responsible for the pre-export phenotype unknown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2022,"claim":"Demonstrating that the unique nepenthesin-1 insert is essential for activity identified a malaria-specific structural feature that allosterically controls catalysis and offers a selectivity handle.","evidence":"In-parasite lethal-depletion rescue with insert mutants, disulfide disruption, and molecular dynamics/Markov state modeling in P. falciparum","pmids":["35952758"],"confidence":"High","gaps":["Allosteric mechanism inferred from simulation rather than direct structure","Insert conformational states not experimentally trapped"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2024,"claim":"Showing PMV cleaves PEXEL motifs in non-exported proteins (e.g. UIS2) redefined it as a general secretory maturase and established that downstream N-terminal residues, not cleavage itself, dictate export fate.","evidence":"Chimeric reporter fusions, N-terminal sequencing/MS, and P1' mutagenesis in P. falciparum (peer-reviewed, preceded by bioRxiv preprint)","pmids":["38334391","37503245"],"confidence":"High","gaps":["Full non-exported substrate set not enumerated","Functional consequence of processing non-exported substrates unclear"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2025,"claim":"Chemoproteomic target engagement plus resistance-mutation genetics confirmed that peptidomimetic antimalarials act directly on PMV, and inhibitor co-crystal structures revealed how to tune PMV-versus-PMX selectivity.","evidence":"Solvent-induced precipitation, thermal profiling, whole-genome sequencing and CRISPR-validated resistance in P. falciparum; X-ray structures of PvPMV-inhibitor complexes with PMV/PMX biochemistry","pmids":["41329554","40035447"],"confidence":"High","gaps":["Structural work performed on the P. vivax ortholog","Clinical relevance of resistance mutations not assessed"],"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium vivax","strain":""}]},{"year":null,"claim":"The molecular identity of PMV's early post-invasion, export-independent function and the complete catalog of its non-exported substrates remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No substrate identified for the pre-export growth arrest seen on severe depletion","Full breadth of non-exported PEXEL substrates and their biological roles undefined"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":[],"partners":[],"other_free_text":["Cleaves the PEXEL/HT motif (RxLxE/Q/D) after the P1 leucine; P3 Arg and P1 Leu are required, while P3 Lys or P1 Ile block cleavage [#3].","P1' and P2 residues are key determinants of catalytic efficiency; P1' identity (e.g. aspartate in UIS2) governs export fate independently of cleavage [#13, #16].","Cleavage is co-translational and depends on PEXEL position relative to the signal sequence, independent of PI(3)P binding [#4, #7].","Adopts a plant-like fold with a malaria-specific helix-turn-helix motif and an essential nepenthesin-1 insert that allosterically influences catalysis [#5, #12].","Catalytic aspartates D118 and D365 are both required for activity, with D365 implicated as the nucleophile [#15].","Essential for asexual blood-stage viability (ring-to-trophozoite arrest) and for gametocyte development and mosquito transmission [#9, #10].","Maintained in substantial excess; severe depletion causes an early post-invasion arrest preceding export-deficit death [#11].","Validated antimalarial target directly engaged by peptidomimetic inhibitors, with a pmv single-nucleotide variant conferring resistance [#4, #18, #19]."]}},"prefetch_data":{},"corpus_meta":[{"pmid":"20130643","id":"PMC_20130643","title":"An aspartyl protease directs malaria effector proteins to the host cell.","date":"2010","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/20130643","citation_count":255,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["PMV","plasmepsin V"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"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":"20130644","id":"PMC_20130644","title":"Plasmepsin V licenses Plasmodium proteins for export into the host erythrocyte.","date":"2010","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/20130644","citation_count":239,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["plasmepsin 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V"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":29468,"output_tokens":5767,"usd":0.087455,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":12760,"output_tokens":5860,"usd":0.10515,"stage2_stop_reason":"end_turn"},"total_usd":0.192605,"stage1_batch_id":"msgbatch_011BPjN2BL33F8cJXD1r7V7T","stage2_batch_id":"msgbatch_01Qwg6vP7qxkpL6Gsc7tajsb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2005,\n      \"finding\": \"PMV (PF3D7_1323500) is an integral membrane protein resident in the endoplasmic reticulum of P. falciparum intraerythrocytic parasites, but not in ERD2-associated Golgi structures; it is expressed throughout asexual development with lowest levels at ring stage; the proregion appears not to be removed following biosynthesis; and unlike food-vacuole plasmepsins, detergent-solubilized PMV does not bind pepstatin A, indicating a distinct function.\",\n      \"method\": \"Subcellular fractionation, solubilization experiments, immunofluorescence microscopy, pepstatin-binding assay\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct fractionation and localization experiments with functional inference; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"16024107\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"PMV is the aspartic acid protease responsible for proteolytic cleavage of the PEXEL/HT motif (RxLxE/Q/D) in the parasite endoplasmic reticulum; PMV cleavage exposes the xE/Q/D residues as the new N-terminus of cargo proteins, which is required for their export into the host erythrocyte; expression of a mature protein with xQ at the N-terminus generated by signal peptidase was not exported, demonstrating that PMV activity is essential and coupled with downstream export events.\",\n      \"method\": \"Transgenic P. falciparum expressing chimeric exported proteins, mass spectrometry identification of cleavage products, signal-peptidase-generated N-terminus control experiment\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two independent simultaneous publications with multiple orthogonal methods; replicated across labs (PMID 20130643 and 20130644)\",\n      \"pmids\": [\"20130643\", \"20130644\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"PMV is an ER-resident aspartic protease with distant homology to mammalian BACE; it recognizes the PEXEL motif and cleaves it at the correct site (after P1 Leu); ER residence is essential for its function, as mislocalization abolishes PEXEL processing.\",\n      \"method\": \"Conditional mislocalization of PMV, in-parasite cleavage assays, sequence homology analysis\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct functional localization experiment with mechanistic consequence, replicated by simultaneous independent publication\",\n      \"pmids\": [\"20130644\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"PMV cleaves N-terminal sequences from RIFIN, STEVOR, and RESA multigene family proteins (the latter containing a relaxed PEXEL, RxLxxE); however, PMV does not cleave PfEMP1 or PEXEL-negative exported proteins SBP-1 or REX-2; lysine at the PEXEL P3 position (present in PfEMP1) blocks PMV activity, and isoleucine at P1 also blocks PMV activity, defining the exquisitely confined substrate specificity of PMV.\",\n      \"method\": \"In vitro cleavage assays with recombinant PMV and peptide substrates, transgenic parasite expression of chimeric proteins\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro cleavage assay with substrate mutagenesis combined with parasite transgenic validation; single lab but two orthogonal methods\",\n      \"pmids\": [\"23387285\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"PMV cleaves the PEXEL motif co-translationally, similar to signal peptidase; pharmacological inhibition of PMV with a PEXEL-mimetic inhibitor causes dose-dependent inhibition of PEXEL processing, blocks protein export including PfEMP1 display on the erythrocyte surface, impairs cytoadherence, and kills parasites at the trophozoite stage; knockdown of PMV enhanced inhibitor sensitivity and overexpression conferred resistance, providing direct evidence that PMV activity is essential for protein export and parasite survival.\",\n      \"method\": \"PEXEL-mimetic inhibitor treatment, PMV knockdown and overexpression in P. falciparum, PEXEL cleavage assays, flow cytometry for surface PfEMP1, parasite growth assays\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods including knockdown, overexpression, and pharmacological inhibition with clear mechanistic readouts; single lab\",\n      \"pmids\": [\"24983235\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The crystal structure of P. vivax PMV in complex with the PEXEL-mimetic inhibitor WEHI-842 was solved to 2.4-Å resolution, revealing a plant-like fold and a malaria-specific helix-turn-helix motif near the C-terminus that are important for substrate cleavage; the structure explains the strict substrate and inhibitor binding requirements of the enzyme.\",\n      \"method\": \"X-ray crystallography (2.4-Å resolution), biochemical inhibition assays, parasite growth assays\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — atomic-resolution crystal structure with functional inhibitor validation; single lab but structure plus biochemistry\",\n      \"pmids\": [\"26214367\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium vivax\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The catalytic protease domain of PMV faces the endoplasmic reticulum lumen, as determined by self-associating split-GFP topology assay, supporting the model that PEXEL/HT motif cleavage and N-α-acetylation occur in the ER lumen and indicating that cytosolic N-α-acetyltransferases are not candidates for the modification.\",\n      \"method\": \"Split-GFP complementation topology assay in P. falciparum\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct topological experiment in parasite with functional inference; single lab, single method\",\n      \"pmids\": [\"25849462\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PEXEL processing by PMV occurs co-translationally and is independent of PI(3)P binding; repositioning the PEXEL motif close to the signal sequence in KAHRP prevented PMV cleavage and abolished export, even though the protein retained putative PI(3)P-binding residues; restoring the PEXEL to its original location rescued PMV processing and export, demonstrating that PEXEL position relative to the signal sequence is conserved for co-translational cleavage by PMV.\",\n      \"method\": \"Transgenic P. falciparum expressing PEXEL-repositioned KAHRP constructs, PEXEL cleavage assays, export assays, ER lipid staining\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistatic transgenic experiment with multiple constructs; directly refutes an alternative PI(3)P mechanism; single lab, multiple constructs and orthogonal readouts\",\n      \"pmids\": [\"26832821\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Recombinant PMV zymogen is enzymatically active; the prosegment is non-essential for refolding or inhibition; mature PMV shows a pH optimum of 5.5–7.0 with Km = 4.6 µM and kcat = 0.24 s⁻¹ at pH 6.0 using a DABCYL-LNKRLLHETQ-E(EDANS) fluorogenic substrate; both zymogen and mature forms are partially inhibited by pepstatin A and certain KNI inhibitors but strongly inhibited by certain metals.\",\n      \"method\": \"Recombinant bacterial expression and refolding, in vitro fluorogenic substrate cleavage assay, kinetic characterization\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro enzymatic reconstitution with kinetic parameters; single lab, single study\",\n      \"pmids\": [\"25447707\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"PMV is expressed and active in P. falciparum stage I–II gametocytes; PMV inhibitors block PEXEL processing and export of gametocyte effector proteins, inhibit gametocyte development from stage II–V, and sublethal inhibitor concentrations produce stage V gametocytes that fail to infect mosquitoes, demonstrating that PMV-dependent protein export is essential for gametocyte development and transmission competence.\",\n      \"method\": \"PMV inhibitor treatment of gametocyte cultures, PEXEL cleavage assays, gametocyte stage progression assays, mosquito infection assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological inhibition with multiple functional readouts across gametocyte stages and transmission; single lab, multiple orthogonal assays\",\n      \"pmids\": [\"31851913\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"PMV is an essential gene for P. falciparum asexual blood-stage viability; conditional gene excision using CRISPR-Cas9 combined with DiCre-mediated recombination inactivated the pfpmv gene, causing severe growth defects and developmental arrest early in the ring-to-trophozoite transition, demonstrating that PMV is essential for parasite viability.\",\n      \"method\": \"CRISPR-Cas9 gene editing combined with DiCre conditional excision, parasite growth assays, phenotypic analysis of ring-to-trophozoite development\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — definitive conditional genetic knockout with clear phenotypic readout; replicates and extends prior pharmacological essentiality evidence\",\n      \"pmids\": [\"30517136\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Stringent post-transcriptional knockdown of PMV using a regulatable system reveals that PMV must be dramatically depleted to affect parasite growth, indicating the parasite maintains PMV in substantial excess; depletion arrests parasite growth immediately after red blood cell invasion, prior to the death caused by exported protein deficit, suggesting PMV inhibitors can halt parasite growth at two distinct points in the life cycle.\",\n      \"method\": \"Post-transcriptional regulatable knockdown system (TetR-DOZI), parasite growth and invasion assays, PEXEL processing assays\",\n      \"journal\": \"ACS infectious diseases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — quantitative tunable knockdown with multiple growth-stage readouts; single lab\",\n      \"pmids\": [\"32069391\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The nepenthesin 1-type insert unique to PMV is essential for parasite growth and PMV activity; mutagenesis of the insert's amino acid sequence or disruption of one of its two disulfide bonds abolishes PMV function and fails to rescue lethal PMV depletion; molecular dynamics and Markov state modeling suggest the insert allosterically affects PMV catalysis.\",\n      \"method\": \"Parasite genetics (lethal PMV depletion rescue with mutant enzymes), site-directed mutagenesis of the nepenthesin insert, molecular dynamics simulations with Markov state modeling\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in-parasite mutagenesis rescue assay combined with structural modeling; single lab but parasite genetics + mutagenesis + MD\",\n      \"pmids\": [\"35952758\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PMV processes PEXEL motifs in non-exported proteins in addition to exported ones; the parasitophorous vacuole protein UIS2 and other non-exported rhoptry proteins contain bona fide PEXEL motifs that are cleaved by PMV in P. falciparum blood stages; an aspartic acid at the P1' position of the UIS2 PEXEL is permissive for PMV cleavage but blocks export, and mutation of this residue to alanine enables export, demonstrating that features of the mature N-terminus rather than PEXEL cleavage per se determine export.\",\n      \"method\": \"Chimeric reporter fusions expressed in P. falciparum, N-terminal sequencing/mass spectrometry of cleavage products, site-directed mutagenesis of P1' position\",\n      \"journal\": \"mSphere\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in-parasite reporter assays with site-directed mutagenesis and biochemical verification; single lab, multiple orthogonal approaches\",\n      \"pmids\": [\"38334391\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PMV processes a non-exported parasitophorous vacuole substrate (UIS2), demonstrating that PMV functions as a more general secretory maturase beyond its established role in marking proteins for export; the identity of residues downstream of the cleavage site controls export fate independently of PMV processing.\",\n      \"method\": \"Chimeric reporter fusions, parasite expression and localization assays (preprint version of the same findings reported in PMID 38334391)\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — preprint superseded by peer-reviewed PMID 38334391; included for completeness but lower weight as preprint\",\n      \"pmids\": [\"37503245\"],\n      \"is_preprint\": true,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Recombinant PfPMV catalytic residues D118 and D365 are both required for activity; mutation of D365 has more pronounced effects on catalytic efficiency than D118, suggesting D365 acts as the catalytic nucleophile that activates the water molecule; the unpaired cysteine C178 is partially involved in substrate recognition, as its modification by metal ions reduces activity.\",\n      \"method\": \"Site-directed mutagenesis (D118N, D365N, C178 substitution) of recombinant PfPMV, fluorogenic substrate kinetic assays\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro mutagenesis with kinetic readout; single lab, single study\",\n      \"pmids\": [\"31108131\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Substrate specificity studies with recombinant PfPMV show that substitution of Ser with Val or Glu at the P1' position reduces enzyme activity by 75%, and substitution of Ile with Lys or Glu at the P2 position reduces cleavage efficiency by 30%; PfPMV activity is inhibited by PMSF and nelfinavir but not pepstatin A; the P1' and P2 positions of PEXEL substrates are key determinants of PMV catalytic efficiency.\",\n      \"method\": \"Recombinant PfPMV in vitro fluorogenic substrate cleavage assays with PEXEL peptide variants, inhibitor assays\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro substrate mutagenesis with kinetic readout; single lab\",\n      \"pmids\": [\"25986559\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Biochemical characterization of P. vivax PMV (Thailand isolate) shows it cleaves PfEMP2-derived peptides more efficiently than HRPII peptides; substitution at P1' Ser to Val or Glu markedly reduces PvPMV activity (as for PfPMV), whereas substitution at P2 with Glu reduces cleavage efficiency by 80% in PvPMV versus only 30% in PfPMV, indicating subtle differences in the S2 binding pocket between species; a four-amino-acid insertion (SVSE at residues 246–249 in PvPMV-Thai) does not interfere with catalytic activity.\",\n      \"method\": \"Recombinant PvPMV expression and refolding, fluorogenic substrate cleavage assays with peptide variants, inhibitor assays\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro biochemical characterization; single lab\",\n      \"pmids\": [\"26795263\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium vivax\", \"strain\": \"Thai isolate\"}]\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Chemoproteomic approaches (solvent-induced protein precipitation and intact-cell thermal profiling) demonstrate direct target engagement of peptidomimetic inhibitors with PMV in P. falciparum parasites; whole-genome sequencing of parasites with reduced peptidomimetic sensitivity revealed a single nucleotide variant within the pmv gene, and reverse genetics validated this mutation as mediating resistance, confirming that the antimalarial activity of peptidomimetics is exerted by directly targeting PMV.\",\n      \"method\": \"Solvent-induced protein precipitation, intact-cell thermal profiling (chemoproteomics), whole-genome sequencing, reverse genetics (CRISPR-validated mutation)\",\n      \"journal\": \"ACS infectious diseases\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal chemoproteomic methods plus reverse genetic validation; single lab\",\n      \"pmids\": [\"41329554\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"X-ray structures of IPF scaffold compounds in complex with PMV (P. vivax) provided structural insights into their binding mode at the active site, revealing avenues to differentially modulate inhibition of PMV versus the related protease plasmepsin X through modifications to the P1 biaryl region.\",\n      \"method\": \"X-ray crystallography of PvPMV-inhibitor complexes, biochemical inhibition assays (PMV and PMX), parasite growth assays\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — crystal structure with biochemical validation; single lab\",\n      \"pmids\": [\"40035447\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium vivax\", \"strain\": \"\"}]\n    }\n  ],\n  \"current_model\": \"PMV (PF3D7_1323500) is an ER-resident integral membrane aspartic protease whose luminal catalytic domain co-translationally cleaves the PEXEL motif (RxLxE/Q/D) after the P1 Leu residue of hundreds of exported and some non-exported parasite proteins; this processing—dependent on the P3 Arg, P1 Leu, P2 position, and the P1' residue of substrates, and structurally supported by a unique plant-like fold with a nepenthesin insert and helix-turn-helix motif—exposes a mature N-terminus required for downstream translocation into the host erythrocyte; PMV is absolutely essential for asexual parasite survival (genetic knockout arrests parasites at ring-to-trophozoite transition) and for gametocyte development and mosquito transmission, making it a validated antimalarial drug target.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PMV (PF3D7_1323500) is an endoplasmic reticulum-resident aspartic protease that acts as the central maturase of the malaria protein export pathway, co-translationally cleaving the PEXEL/HT motif (RxLxE/Q/D) after the P1 leucine to generate the mature N-terminus required for translocation of cargo into the host erythrocyte [#1, #2, #4]. Its catalytic protease domain faces the ER lumen [#6], and correct ER residence is itself essential for activity, since mislocalization abolishes PEXEL processing [#2]. Substrate recognition is exquisitely confined: a P3 arginine and P1 leucine are required, lysine at P3 (as in PfEMP1) or isoleucine at P1 blocks cleavage, and the P1' and P2 residues tune catalytic efficiency—so that PMV processes RIFIN, STEVOR and RESA family proteins but not PfEMP1 or PEXEL-negative exported proteins [#3, #16]. PMV also processes bona fide PEXEL motifs in non-exported proteins such as the parasitophorous vacuole protein UIS2, establishing that it is a more general secretory maturase and that residues of the mature N-terminus (e.g. a P1' aspartate) rather than cleavage per se determine export fate [#13]. Structurally, PMV adopts a plant-like fold with a malaria-specific helix-turn-helix motif and a unique nepenthesin-1 insert that is essential for activity and allosterically influences catalysis [#5, #12], with catalytic aspartates D118 and D365 required for turnover [#15]. PMV is essential for asexual blood-stage viability—conditional knockout arrests parasites at the ring-to-trophozoite transition [#10]—and for gametocyte development and mosquito transmission [#9], and pharmacological inhibition blocks export, impairs cytoadherence and kills parasites, validating PMV as a directly engaged antimalarial drug target [#4, #18].\",\n  \"teleology\": [\n    {\n      \"year\": 2005,\n      \"claim\": \"Establishing that PMV is an ER-resident integral membrane protein distinct from food-vacuole plasmepsins framed it as an enzyme with an unusual, non-degradative function in the secretory pathway.\",\n      \"evidence\": \"Subcellular fractionation, immunofluorescence, and pepstatin-binding assays in P. falciparum intraerythrocytic parasites\",\n      \"pmids\": [\"16024107\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Substrate and catalytic function not yet identified\", \"Failure to bind pepstatin A left the enzymatic activity unexplained\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identifying PMV as the protease that cleaves the PEXEL/HT motif in the ER answered how exported proteins are marked for delivery to the host cell, defining PMV's core biological role.\",\n      \"evidence\": \"Transgenic chimeric export reporters, mass spectrometry of cleavage products, and conditional mislocalization in P. falciparum, with signal-peptidase N-terminus control\",\n      \"pmids\": [\"20130643\", \"20130644\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full substrate repertoire not defined\", \"Mechanism coupling cleavage to translocation unresolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Mapping which family proteins are and are not cleaved defined PMV's confined substrate specificity and explained why some exported proteins bypass PEXEL processing.\",\n      \"evidence\": \"In vitro cleavage assays with recombinant PMV and peptide substrates plus transgenic chimeric expression in P. falciparum\",\n      \"pmids\": [\"23387285\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Rules for PEXEL-negative export not established\", \"Structural basis of specificity not yet resolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Pharmacological inhibition plus knockdown/overexpression demonstrated that PMV activity is causally required for protein export, cytoadherence and parasite survival, validating it as a drug target.\",\n      \"evidence\": \"PEXEL-mimetic inhibitor treatment, PMV knockdown and overexpression, PfEMP1 surface flow cytometry, and growth assays in P. falciparum\",\n      \"pmids\": [\"24983235\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether all lethality stems from export failure vs other roles unclear\", \"Resistance mechanisms not yet mapped\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"In vitro reconstitution of recombinant PMV with kinetic parameters showed the enzyme is active without prosegment removal and clarified its pH optimum and inhibitor profile.\",\n      \"evidence\": \"Recombinant bacterial expression/refolding and fluorogenic substrate kinetics\",\n      \"pmids\": [\"25447707\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Recombinant kinetics may not reflect the membrane-embedded ER enzyme\", \"Single-lab characterization\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"The crystal structure of P. vivax PMV revealed a plant-like fold and a malaria-specific helix-turn-helix motif, explaining strict substrate and inhibitor binding requirements.\",\n      \"evidence\": \"X-ray crystallography at 2.4 Å with a PEXEL-mimetic inhibitor plus biochemical and growth assays\",\n      \"pmids\": [\"26214367\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure is of the P. vivax ortholog\", \"Conformational dynamics during catalysis not captured\"],\n      \"attribution\": [{\"species\": \"Plasmodium vivax\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Topology mapping placed the catalytic domain in the ER lumen, localizing PEXEL cleavage and N-acetylation to the luminal compartment and excluding cytosolic acetyltransferases.\",\n      \"evidence\": \"Self-associating split-GFP topology assay in P. falciparum\",\n      \"pmids\": [\"25849462\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single method, single lab\", \"Identity of the responsible N-acetyltransferase not established\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Systematic peptide-variant kinetics quantified how P1' and P2 residues govern cleavage efficiency, refining the substrate rules across P. falciparum and P. vivax orthologs.\",\n      \"evidence\": \"Recombinant PfPMV and PvPMV fluorogenic substrate assays with PEXEL peptide variants and inhibitor testing\",\n      \"pmids\": [\"25986559\", \"26795263\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vitro peptide efficiencies may not predict in-cell substrate selection\", \"S2 pocket differences between species not structurally resolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}, {\"species\": \"Plasmodium vivax\", \"strain\": \"Thai isolate\"}]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Repositioning the PEXEL motif in KAHRP showed that cleavage is co-translational and depends on PEXEL position relative to the signal sequence, refuting a PI(3)P-based export model.\",\n      \"evidence\": \"Transgenic P. falciparum expressing PEXEL-repositioned KAHRP constructs with cleavage, export, and ER lipid staining readouts\",\n      \"pmids\": [\"26832821\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular timing of co-translational recognition not directly visualized\", \"Applicability to all substrates untested\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Conditional CRISPR/DiCre knockout gave definitive genetic proof that PMV is essential for asexual viability, pinpointing developmental arrest at the ring-to-trophozoite transition.\",\n      \"evidence\": \"CRISPR-Cas9 with DiCre conditional excision, growth and phenotypic analysis in P. falciparum\",\n      \"pmids\": [\"30517136\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise molecular cause of arrest not dissected\", \"Whether death is solely export-dependent unresolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Extending PMV's role to gametocytes showed that PMV-dependent export is required for gametocyte development and transmission competence, broadening its target relevance.\",\n      \"evidence\": \"PMV inhibitor treatment of gametocyte cultures with cleavage, stage-progression, and mosquito infection assays in P. falciparum\",\n      \"pmids\": [\"31851913\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific gametocyte substrates driving the phenotype not fully catalogued\", \"Reliance on pharmacological rather than genetic ablation in sexual stages\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Mutagenesis of catalytic residues confirmed D118 and D365 as required for activity, with D365 implicated as the catalytic nucleophile and C178 in substrate recognition.\",\n      \"evidence\": \"Site-directed mutagenesis of recombinant PfPMV with fluorogenic substrate kinetics\",\n      \"pmids\": [\"31108131\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Assignment of nucleophile role is inferential from kinetics\", \"Role of C178 not structurally confirmed\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Tunable knockdown revealed PMV is maintained in large excess and that severe depletion arrests growth immediately after invasion, before export-deficit death, implying two distinct points of vulnerability.\",\n      \"evidence\": \"TetR-DOZI regulatable knockdown with growth, invasion, and PEXEL processing assays in P. falciparum\",\n      \"pmids\": [\"32069391\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis of the early post-invasion arrest unidentified\", \"Substrates responsible for the pre-export phenotype unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstrating that the unique nepenthesin-1 insert is essential for activity identified a malaria-specific structural feature that allosterically controls catalysis and offers a selectivity handle.\",\n      \"evidence\": \"In-parasite lethal-depletion rescue with insert mutants, disulfide disruption, and molecular dynamics/Markov state modeling in P. falciparum\",\n      \"pmids\": [\"35952758\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Allosteric mechanism inferred from simulation rather than direct structure\", \"Insert conformational states not experimentally trapped\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Showing PMV cleaves PEXEL motifs in non-exported proteins (e.g. UIS2) redefined it as a general secretory maturase and established that downstream N-terminal residues, not cleavage itself, dictate export fate.\",\n      \"evidence\": \"Chimeric reporter fusions, N-terminal sequencing/MS, and P1' mutagenesis in P. falciparum (peer-reviewed, preceded by bioRxiv preprint)\",\n      \"pmids\": [\"38334391\", \"37503245\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full non-exported substrate set not enumerated\", \"Functional consequence of processing non-exported substrates unclear\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Chemoproteomic target engagement plus resistance-mutation genetics confirmed that peptidomimetic antimalarials act directly on PMV, and inhibitor co-crystal structures revealed how to tune PMV-versus-PMX selectivity.\",\n      \"evidence\": \"Solvent-induced precipitation, thermal profiling, whole-genome sequencing and CRISPR-validated resistance in P. falciparum; X-ray structures of PvPMV-inhibitor complexes with PMV/PMX biochemistry\",\n      \"pmids\": [\"41329554\", \"40035447\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural work performed on the P. vivax ortholog\", \"Clinical relevance of resistance mutations not assessed\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}, {\"species\": \"Plasmodium vivax\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The molecular identity of PMV's early post-invasion, export-independent function and the complete catalog of its non-exported substrates remain unresolved.\",\n      \"evidence\": null,\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No substrate identified for the pre-export growth arrest seen on severe depletion\", \"Full breadth of non-exported PEXEL substrates and their biological roles undefined\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0004190\", \"supporting_discovery_ids\": [1, 2, 8, 15, 16]},\n      {\"term_id\": \"GO:0004175\", \"supporting_discovery_ids\": [1, 3, 13]},\n      {\"term_id\": \"GO:0008236\", \"supporting_discovery_ids\": [2, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005789\", \"supporting_discovery_ids\": [0, 2, 6]},\n      {\"term_id\": \"GO:0016021\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005788\", \"supporting_discovery_ids\": [6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0046903\", \"supporting_discovery_ids\": [1, 2, 4, 13]},\n      {\"term_id\": \"GO:0016485\", \"supporting_discovery_ids\": [1, 3, 13]},\n      {\"term_id\": \"GO:0051701\", \"supporting_discovery_ids\": [4, 9]}\n    ],\n    \"complexes\": [],\n    \"partners\": [],\n    \"other_free_text\": [\n      \"Cleaves the PEXEL/HT motif (RxLxE/Q/D) after the P1 leucine; P3 Arg and P1 Leu are required, while P3 Lys or P1 Ile block cleavage [#3].\",\n      \"P1' and P2 residues are key determinants of catalytic efficiency; P1' identity (e.g. aspartate in UIS2) governs export fate independently of cleavage [#13, #16].\",\n      \"Cleavage is co-translational and depends on PEXEL position relative to the signal sequence, independent of PI(3)P binding [#4, #7].\",\n      \"Adopts a plant-like fold with a malaria-specific helix-turn-helix motif and an essential nepenthesin-1 insert that allosterically influences catalysis [#5, #12].\",\n      \"Catalytic aspartates D118 and D365 are both required for activity, with D365 implicated as the nucleophile [#15].\",\n      \"Essential for asexual blood-stage viability (ring-to-trophozoite arrest) and for gametocyte development and mosquito transmission [#9, #10].\",\n      \"Maintained in substantial excess; severe depletion causes an early post-invasion arrest preceding export-deficit death [#11].\",\n      \"Validated antimalarial target directly engaged by peptidomimetic inhibitors, with a pmv single-nucleotide variant conferring resistance [#4, #18, #19].\"\n    ]\n  }\n}","audit_flag":null,"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_1323500","name":null,"product":"plasmepsin V","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PbANKA","gene_id":"PBANKA_1338700","name":null,"product":"plasmepsin V, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_1205300","name":null,"product":"plasmepsin V, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"PMV","evaluation":null}