{"gene":"PF3D7_1121600","run_date":"2026-09-08T12:51:28","timeline":{"discoveries":[{"year":1987,"finding":"EXP1 (exp-1) is exported from P. falciparum parasites into a new compartment within the host erythrocyte; the gene contains two introns and is highly conserved across parasite lines, suggesting an important function.","method":"Monoclonal antibody localization, gene cloning and sequencing","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — monoclonal antibody-based localization and gene characterization, single lab but multiple isolates examined","pmids":["2438130"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1985,"finding":"EXP1 is a ~23 kDa blood-stage protein with a signal peptide and an internal hydrophobic transmembrane anchor sequence; it shares antigenic determinants with sporozoites due to tetrapeptide repeats related to the circumsporozoite protein.","method":"cDNA cloning, nucleotide sequencing, affinity-purified antibody immunoassay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — sequence-based structural inference plus immunological cross-reactivity, single lab","pmids":["2410913"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1991,"finding":"EXP1 is an integral membrane protein: in a cell-free translation-translocation system it was inserted into canine pancreatic microsomes with its N-terminus protected from proteinase K (facing the lumen) and its C-terminus exposed. In vivo, EXP1 is alkali-resistant (membrane-integrated) and segment-specific antibodies confirm the N-terminus faces the vesicle interior while the C-terminus is protease-accessible, consistent with a single-pass topology.","method":"Cell-free translation/translocation into microsomes, proteinase K protection assay, alkaline extraction, segment-specific monoclonal antibodies","journal":"Molecular and biochemical parasitology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with protease protection plus orthogonal in vivo alkaline extraction and topology probing in multiple experiments","pmids":["1852170"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1994,"finding":"EXP1 is located at the parasitophorous vacuole membrane (PVM) and in membrane-bound compartments in the erythrocyte cytoplasm; a second exported protein (EXP-2, 35 kDa) co-localizes with EXP1 at these sites.","method":"Monoclonal antibody co-localization, membrane fractionation, detergent solubilization, alkali extraction","journal":"Parasitology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-localization and fractionation data from single lab, multiple biochemical methods","pmids":["8058359"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1994,"finding":"EXP1 concentrates in membrane domains on the periphery of the parasite and in the tubovesicular membrane network (TVN), as shown by simultaneous lipid and protein fluorescence imaging; its distribution is distinct from a 45 kDa Maurer's cleft protein, indicating domain segregation within the TVN.","method":"High-resolution confocal microscopy with fluorescent sphingolipid labeling and immunostaining","journal":"Experimental parasitology","confidence":"Medium","confidence_rationale":"Tier 3 / Weak — single-lab localization study, no functional consequence directly tested","pmids":["7957747"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2002,"finding":"The N-terminal signal sequence of EXP1, when fused to GFP, directs the chimeric protein to the parasitophorous vacuole (default secretory destination) in transfected parasites; some chimeric protein is redirected to the food vacuole. FRAP studies revealed that the PV contains subcompartments that are only partially interconnected.","method":"Transfection of GFP chimeras, live fluorescence microscopy, photobleaching (FRAP), dual lipid labeling","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct live-cell imaging with FRAP and dual labeling in transfected parasites, multiple orthogonal approaches","pmids":["12456681"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2003,"finding":"EXP1 and ETRAMP family proteins are both PVM-resident, but ETRAMPs (positively charged) and EXP1 (negatively charged integral PVM protein) define separate PVM domains, suggesting functionally distinct microdomains with oppositely charged surface coats. Stage-specific expression of ETRAMPs coincides with morphological changes in development.","method":"Northern and Western blotting, colocalization by fluorescence microscopy, selective permeabilization, immunoelectron microscopy","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — immunoelectron microscopy and selective permeabilization confirm PVM location, EXP1 used as comparator, single lab","pmids":["12686607"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2003,"finding":"EXP1 is a component of a continuous membrane network of parasite origin in the erythrocyte cytoplasm (comprising TVM, Maurer's clefts, and membrane whorls), as shown by co-localization at light and electron microscopy levels; small vesicles (15–25 nm) were observed at sites where this network contacts the erythrocyte plasma membrane.","method":"Immunofluorescence and immunoelectron microscopy, vital staining with LysoSensor Green","journal":"European journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-localization at two levels of microscopy, single lab","pmids":["12868595"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2001,"finding":"EXP1 (PfEXP1), together with internalized host membrane proteins, can be detected in detergent-resistant membrane (DRM) raft fractions within the parasitophorous vacuole, indicating that lipid rafts are present at the PVM.","method":"Detergent-resistant membrane (DRM) fractionation, Western blotting","journal":"International journal for parasitology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — biochemical fractionation only, single lab, no direct functional consequence established","pmids":["11566306"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2006,"finding":"In vivo cross-linking in asexual P. falciparum stages revealed that EXP1 and ETRAMP family members form oligomeric arrays in the PVM; each ETRAMP and EXP1 define separate, non-overlapping arrays (microdomains). Recombinant ETRAMPs oligomerize independently in bacterial membranes, but EXP1 arrays are distinct from ETRAMP arrays.","method":"In vivo chemical cross-linking, recombinant protein expression in bacterial membranes, immunofluorescence microscopy","journal":"Molecular microbiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo cross-linking plus bacterial membrane reconstitution, single lab, two orthogonal methods","pmids":["16420351"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2014,"finding":"EXP1 functions as a membrane glutathione S-transferase (mGST): it efficiently degrades cytotoxic hematin in vitro and is potently inhibited by artesunate (nanomolar potency). EXP1 is associated with artesunate metabolism and susceptibility in drug-pressured parasites, implicating it in the mode of action of artesunate.","method":"Computational network analysis (supergenomic compression) for prediction; in vitro GST activity assay with hematin substrate; artesunate inhibition assay; drug-pressured parasite metabolic profiling","journal":"Cell","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro enzymatic assay with substrate and inhibitor characterization, but single lab and later challenged by conditional KO studies","pmids":["25126794"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2013,"finding":"EXP1 is a dynamic PVM protein during liver-stage infection; torins block trafficking of EXP1 to the liver-stage PVM, leading to parasite elimination by the hepatocyte. This effect is specific to liver stage and distinct from blood-stage action.","method":"Immunofluorescence microscopy of liver-stage parasites treated with torins, in vitro and in vivo parasite viability assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct imaging of protein trafficking block with functional parasite death readout, in vitro and in vivo corroboration","pmids":["23836641"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2017,"finding":"The C-terminal region of EXP1 binds host Apolipoprotein H (ApoH) during hepatic Plasmodium development. Expression of a C-terminally truncated EXP1 missing the ApoH-interaction site, or siRNA knockdown of ApoH in hepatic cells or mouse livers, impairs intrahepatic parasite development. Infection of mice with sporozoites expressing truncated EXP1 reduces liver burden and delays blood-stage patency.","method":"Protein interaction mapping, truncation mutants, RNA interference (siRNA) knockdown of ApoH in cells and mice, in vivo sporozoite challenge with mutant parasites","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal genetic and cell biological approach (truncation mutant + host gene RNAi) with in vivo validation, multiple orthogonal methods","pmids":["28137845"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2017,"finding":"Trafficking of EXP1 to the PVM is independent of the folding state of the protein and continues unabated upon inactivation of the PTEX translocon, indicating that PVM membrane protein trafficking occurs by a mechanism distinct from PTEX-mediated protein export.","method":"Transfection with misfolded EXP1 constructs, conditional PTEX inactivation, fluorescence microscopy to track PVM localization","journal":"Cellular microbiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct genetic and pharmacological perturbation of trafficking pathway, single lab","pmids":["27892646"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2017,"finding":"EXP1 recombinant protein shows potent in vitro inhibition of membrane glutathione S-transferase activity by chloroquine (IC50 ~9 nM with hematin substrate; ~19 nM with CDNB), suggesting chloroquine may inhibit EXP1 mGST activity without requiring iron-dependent activation.","method":"In vitro GST activity assay with recombinant EXP1, hematin and CDNB substrates, chloroquine inhibition dose-response","journal":"International journal for parasitology. Drugs and drug resistance","confidence":"Low","confidence_rationale":"Tier 1 / Weak — in vitro biochemical assay only with recombinant protein, single lab, no in vivo confirmation","pmids":["29324251"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":"3D7"}]},{"year":2018,"finding":"EXP1 is initially localized to dense granules in P. falciparum merozoites (co-localizing with RESA) and is translocated to the PVM after erythrocyte invasion, as confirmed by immunofluorescence and immunoelectron microscopy.","method":"Immunofluorescence assay (IFA) with anti-EXP1 and anti-RESA antibodies, immunoelectron microscopy","journal":"Parasitology international","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two orthogonal microscopy methods (IFA + immunoEM) demonstrating pre-invasion dense granule localization and post-invasion PVM translocation","pmids":["29886341"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2018,"finding":"BioID proximity labeling using EXP1 fused to BirA* in P. berghei blood-stage parasites identified 61 known and candidate PVM proteins, validating EXP1 as a PVM resident suitable as a BioID anchor and expanding the PVM proteome.","method":"BioID (proximity biotinylation with BirA* fused to EXP1), affinity purification, LC-MS/MS, label-free quantitation","journal":"mSphere","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proximity labeling mass spectrometry with EXP1 as bait confirms PVM localization and identifies interacting proteins, single lab","pmids":["29404413"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2019,"finding":"EXP1 is essential for P. falciparum intraerythrocytic survival. Conditional knockout of EXP1 abolishes the nutrient-permeable channel activity at the PVM (measured by patch-clamp) and disrupts the correct localization of EXP2 (a pore-forming protein required for nutrient-permeable channel and protein export). Loss of EXP1 impairs only the nutrient-permeable channel activity, not protein export via PTEX. Parasites with reduced EXP1 become hypersensitive to low nutrient conditions, confirming EXP1 is specifically required for functional expression of EXP2 as a nutrient-permeable channel.","method":"Conditional knockout (DiCre-based), patch-clamp electrophysiology of PVM, immunofluorescence microscopy of EXP2 localization, nutrient deprivation survival assay","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — conditional KO with patch-clamp electrophysiology and localization studies, multiple orthogonal methods, rigorous controls","pmids":["31568532"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2019,"finding":"The GST activity previously attributed to EXP1 cannot account for its essential function in vivo, as conditional knockdown recapitulated the essential phenotype independently of any GST activity.","method":"Conditional knockdown (TetR-DOZI-aptamer system), intraerythrocytic growth assays","journal":"Cellular microbiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional knockdown with specific growth phenotype, single lab, negative result regarding GST function","pmids":["31990132"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2020,"finding":"EXP1 is required for proper organization of EXP2 within the PVM. EXP1 knockdown causes profound changes in vacuole ultrastructure (increased PVM–parasite plasma membrane separation, abnormal membrane structures) and substantially alters EXP2 distribution but does not affect HSP101 (unfoldase) distribution or PTEX translocon activity.","method":"CRISPR/Cpf1-based installation of TetR-DOZI-aptamer conditional knockdown, BioID2 proximity labeling at PVM, immunofluorescence and ultrastructural electron microscopy","journal":"Cellular microbiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional knockdown with BioID proteomics, immunofluorescence, and ultrastructural EM, multiple orthogonal methods","pmids":["31990132"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2019,"finding":"In P. berghei, the N-terminal domain of EXP1 is essential for parasite blood-stage survival, while the C-terminal (CT) domain is required for normal mosquito-stage development and for correct EXP1 localization to the PVM in intrahepatic parasites; truncation of the CT domain severely limits hepatic replication and prevents egress into the blood.","method":"CRISPR-based truncation mutants of PbEXP1, mouse infection models, immunofluorescence microscopy","journal":"Cellular microbiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — domain-specific genetic truncation with in vivo multi-stage phenotyping and localization analysis","pmids":["31364224"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":1999,"finding":"The signal sequence of EXP1, when fused to PfHRPI, diverts HRPI away from the microsomal translocation machinery, demonstrating that the EXP1 signal sequence actively engages the ER translocation pathway and can redirect other proteins to it.","method":"Cell-free translation-translocation assay with chimeric constructs in pancreatic microsomes","journal":"Novartis Foundation symposium","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro reconstitution assay, single lab, functional consequence of signal sequence established","pmids":["10645548"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1994,"finding":"EXP1 protein is expressed in P. falciparum liver-stage parasites, not only blood stages, as demonstrated by immunofluorescence staining of infected hepatocytes.","method":"Immunofluorescence assay of infected hepatocytes","journal":"Experimental parasitology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single immunofluorescence study, localization without functional follow-up","pmids":["8050527"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1996,"finding":"The P. yoelii ortholog of EXP1 (PyHEP17) shares 37% amino acid identity with PfEXP1, has a similar expression pattern in hepatocytes and erythrocytes, and shows antigenic cross-reactivity; immunization with PyHEP17 induces protective antibodies and CTLs in mice, establishing the P. falciparum EXP1 as the functional homolog.","method":"Gene cloning and sequencing, immunological cross-reactivity assays, mouse immunization and protection studies","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — sequence homology supported by cross-reactive antibody and protective immunization data across species","pmids":["8663412"],"is_preprint":false,"attribution":[{"species":"Plasmodium yoelii","strain":""},{"species":"Plasmodium falciparum","strain":""}]},{"year":1996,"finding":"A 43 kDa P. berghei antigen sharing immunological cross-reactivity with PfEXP1 was identified at the parasite surface; antisense phosphorothioate oligodeoxynucleotides targeting exp-1 mRNA inhibited P. falciparum development in vitro by 47% and extended lifespan of P. berghei-infected mice by 2–4-fold, suggesting EXP1 is functionally important for parasite survival.","method":"Cross-reactive antibody localization, antisense oligodeoxynucleotide inhibition in vitro and in vivo mouse experiments","journal":"Parasitology research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — antisense inhibition approach with indirect phenotype readout, single lab, limited mechanistic resolution","pmids":["8825207"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":""},{"species":"Plasmodium falciparum","strain":""}]}],"current_model":"EXP1 (PF3D7_1121600) is an essential, single-pass integral membrane protein of the parasitophorous vacuole membrane (PVM) that is initially stored in dense granules of merozoites and translocated to the PVM after erythrocyte invasion; its N-terminal signal sequence engages the ER translocation machinery and directs secretion to the PV, while its C-terminal domain mediates interaction with host Apolipoprotein H during liver-stage development and is required for correct PVM localization in hepatic parasites; at the PVM, EXP1 forms oligomeric microdomains separate from ETRAMP arrays, is required for the correct localization and function of EXP2 as the nutrient-permeable channel (demonstrated by patch-clamp after conditional knockout), and thereby enables nutrient acquisition by intraerythrocytic parasites, a role that is independent of a previously proposed but in-vivo-dispensable glutathione S-transferase activity."},"narrative":{"mechanistic_narrative":"EXP1 (PF3D7_1121600) is an essential, single-pass integral membrane protein of the parasitophorous vacuole membrane (PVM) that is required for nutrient acquisition by intraerythrocytic Plasmodium parasites [PMID:31568532]. It is synthesized as a ~23 kDa protein bearing an N-terminal signal sequence and an internal hydrophobic anchor, and adopts a defined single-pass topology with its N-terminus in the vesicle lumen and its C-terminus exposed to the cytoplasmic face [PMID:2410913, PMID:1852170]. Its signal sequence actively engages the ER translocation machinery and directs the protein along the default secretory route to the parasitophorous vacuole [PMID:12456681, PMID:10645548], with trafficking to the PVM occurring independently of the PTEX protein-export translocon and independent of the folding state of the protein [PMID:27892646]. In P. falciparum merozoites, EXP1 is first stored in dense granules and is translocated to the PVM after erythrocyte invasion [PMID:29886341], where it forms oligomeric arrays that occupy microdomains distinct from those of ETRAMP family proteins [PMID:16420351, PMID:12686607]. Conditional knockout demonstrates that EXP1 is required for the correct organization and function of EXP2 as the PVM nutrient-permeable channel: loss of EXP1 abolishes channel activity measured by patch-clamp and renders parasites hypersensitive to low nutrient conditions, while leaving PTEX-mediated protein export intact [PMID:31568532, PMID:31990132]. A previously proposed membrane glutathione S-transferase activity that degrades hematin and is inhibited by artesunate [PMID:25126794] does not account for the essential in vivo function of EXP1, since conditional knockdown recapitulates the essential phenotype independently of GST activity [PMID:31990132]. In liver stages, the C-terminal domain of EXP1 binds host Apolipoprotein H and is required for correct PVM localization and intrahepatic development, as shown in P. berghei by truncation mutants and host ApoH knockdown [PMID:28137845, PMID:31364224].","teleology":[{"year":1987,"claim":"Establishing that EXP1 is exported beyond the parasite into a new host-cell compartment defined it as a secreted/exported antigen and raised the question of its destination and function.","evidence":"Monoclonal antibody localization plus gene cloning and sequencing in P. falciparum","pmids":["2438130","2410913"],"confidence":"Medium","gaps":["Precise membrane compartment not yet resolved","Molecular function unknown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1991,"claim":"Determining that EXP1 is an integral membrane protein with a fixed single-pass topology (N-terminus luminal, C-terminus exposed) set the structural framework for how its two domains face different environments.","evidence":"Cell-free translation/translocation into microsomes with proteinase K protection, alkaline extraction, and segment-specific antibodies in P. falciparum","pmids":["1852170"],"confidence":"High","gaps":["Function of each domain not established","Oligomeric state in native membrane not addressed"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1994,"claim":"Pinpointing EXP1 to the PVM and to exported membrane networks (TVN/tubovesicular membrane) — and showing it segregates from other exported proteins and co-resides with EXP-2 — localized the protein to its site of action and hinted at organized membrane microdomains.","evidence":"Monoclonal antibody co-localization, membrane fractionation, and confocal lipid/protein imaging in P. falciparum; liver-stage expression by immunofluorescence","pmids":["8058359","7957747","8050527"],"confidence":"Medium","gaps":["Functional consequence of domain segregation not tested","Relationship between EXP1 and EXP-2 not mechanistically defined"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1996,"claim":"Cross-species orthology (PyHEP17, P. berghei antigen) and antisense/immunization phenotypes provided the first functional evidence that EXP1 matters for parasite survival and protective immunity.","evidence":"Ortholog cloning, cross-reactive antibodies, mouse immunization/protection, and antisense oligonucleotide inhibition in P. yoelii, P. berghei and P. falciparum","pmids":["8663412","8825207"],"confidence":"Low","gaps":["Antisense phenotype is indirect with limited mechanistic resolution","Molecular basis of essentiality not identified"],"attribution":[{"species":"Plasmodium yoelii","strain":""},{"species":"Plasmodium berghei","strain":""},{"species":"Plasmodium falciparum","strain":""}]},{"year":2002,"claim":"Showing the EXP1 signal sequence directs GFP chimeras to the PV by default and can redirect other proteins into the ER translocation pathway defined how EXP1 is trafficked and revealed subcompartmentation within the PV.","evidence":"GFP-chimera transfection with FRAP and dual lipid labeling, and cell-free translocation of chimeric constructs in P. falciparum","pmids":["12456681","10645548"],"confidence":"High","gaps":["In vivo trafficking route to PVM not yet distinguished from other pathways","Determinants of PV subcompartmentation unknown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2006,"claim":"Demonstrating that EXP1 forms oligomeric arrays occupying microdomains distinct from ETRAMP arrays established that the PVM is organized into segregated protein assemblies rather than a homogeneous membrane.","evidence":"In vivo chemical cross-linking, recombinant expression in bacterial membranes, and immunofluorescence in P. falciparum; earlier charge-based domain comparison","pmids":["16420351","12686607","12868595","11566306"],"confidence":"Medium","gaps":["Functional role of EXP1 oligomers not defined","Composition of EXP1 microdomains not resolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2014,"claim":"Assigning EXP1 a membrane glutathione S-transferase activity that degrades hematin and is inhibited by artesunate proposed an enzymatic role linked to antimalarial drug action.","evidence":"Computational prediction, in vitro GST assay with hematin substrate, and artesunate inhibition/drug-pressure profiling in P. falciparum","pmids":["25126794"],"confidence":"Medium","gaps":["In vitro enzymatic activity not shown to explain in vivo essentiality","Physiological relevance later challenged by conditional knockout"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2017,"claim":"Mapping a C-terminal EXP1 interaction with host Apolipoprotein H, and showing PVM trafficking is PTEX-independent, defined a liver-stage host-interaction function and separated EXP1 delivery from the canonical protein-export route.","evidence":"Interaction mapping, C-terminal truncation mutants, ApoH siRNA knockdown and in vivo sporozoite challenge in P. berghei; misfolded-construct and conditional PTEX-inactivation trafficking in P. falciparum; liver-stage trafficking block by torins","pmids":["28137845","27892646","23836641"],"confidence":"High","gaps":["Molecular consequence of ApoH binding for parasite development not fully defined","Trafficking machinery that delivers EXP1 to the PVM not identified"],"attribution":[{"species":"Plasmodium berghei","strain":""},{"species":"Plasmodium falciparum","strain":""}]},{"year":2018,"claim":"Localizing EXP1 to dense granules pre-invasion and validating it as a PVM BioID anchor clarified its delivery route and enabled proteomic mapping of the PVM neighborhood.","evidence":"IFA/immunoEM co-localization with RESA in P. falciparum merozoites; BioID proximity labeling with EXP1-BirA* in P. berghei blood stages","pmids":["29886341","29404413"],"confidence":"Medium","gaps":["Which BioID-identified proteins are direct EXP1 partners not determined","Mechanism of dense-granule-to-PVM translocation unresolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium berghei","strain":""}]},{"year":2019,"claim":"Conditional genetics resolved the essential function: EXP1 is required for the correct localization and channel function of EXP2, hence for PVM nutrient uptake, and its essentiality is independent of the earlier-proposed GST activity; domain analysis separated blood-stage from mosquito/liver-stage requirements.","evidence":"DiCre conditional knockout with PVM patch-clamp and EXP2 localization, TetR-DOZI/CRISPR-Cpf1 conditional knockdown with BioID and ultrastructural EM in P. falciparum; CRISPR domain-truncation multi-stage phenotyping in P. berghei","pmids":["31568532","31990132","31364224"],"confidence":"High","gaps":["Molecular mechanism by which EXP1 organizes EXP2 not defined","Whether EXP1 physically contacts EXP2 in the channel not established"],"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium berghei","strain":""}]},{"year":null,"claim":"How EXP1 oligomers physically organize EXP2 into a functional nutrient-permeable channel, and what the structural basis of this interaction is, remain unresolved.","evidence":"No structural or reconstitution study of the EXP1–EXP2 assembly is present in the corpus","pmids":[],"confidence":"Medium","gaps":["No structure of EXP1 or the EXP1/EXP2 assembly","Direct physical interaction with EXP2 not demonstrated","Mechanism linking EXP1 microdomains to channel function unknown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":["EXP1 oligomeric PVM microdomain arrays (distinct from ETRAMP arrays) [#9]"],"partners":["EXP2 (FUNCTIONAL/ORGANIZATIONAL DEPENDENCY; EXP1 REQUIRED FOR CORRECT EXP2 LOCALIZATION AND NUTRIENT-PERMEABLE CHANNEL ACTIVITY) [#17, #19]","HOST APOLIPOPROTEIN H (APOH), BOUND VIA THE EXP1 C-TERMINAL DOMAIN IN LIVER STAGE [#12]","EXP-2 (CO-LOCALIZATION AT PVM) [#3]"],"other_free_text":["Single-pass integral membrane topology: N-terminus luminal, C-terminus cytoplasmic [#2]","N-terminal signal sequence directs secretion to the PV via the ER translocation pathway [#5, #21]","Trafficking to the PVM is PTEX-independent and folding-state-independent [#13]","Stored in dense granules of merozoites, translocated to PVM after invasion [#15]","N-terminal domain essential for blood-stage survival; C-terminal domain required for mosquito- and liver-stage development and hepatic PVM localization (P. berghei) [#20]","Proposed membrane GST/hematin-degrading activity inhibited by artesunate and chloroquine in vitro, but this activity does not account for essential in vivo function [#10, #14, #18]","Expressed in both blood and liver stages; P. yoelii ortholog PyHEP17 (37% identity) confers protective immunity in mice [#22, #23]"]}},"prefetch_data":{},"corpus_meta":[{"pmid":"12686607","id":"PMC_12686607","title":"etramps, a new Plasmodium falciparum gene family coding for developmentally regulated and highly charged membrane proteins located at the parasite-host cell interface.","date":"2003","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/12686607","citation_count":141,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["EXP1"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"2438130","id":"PMC_2438130","title":"A malaria protein exported into a new compartment within the host erythrocyte.","date":"1987","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/2438130","citation_count":135,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["EXP1"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"10878392","id":"PMC_10878392","title":"HLA-DR-promiscuous T cell epitopes from Plasmodium falciparum pre-erythrocytic-stage antigens restricted by multiple HLA class II alleles.","date":"2000","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/10878392","citation_count":121,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["exported protein 1"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"1852170","id":"PMC_1852170","title":"An exported protein of Plasmodium falciparum is synthesized as an integral membrane protein.","date":"1991","source":"Molecular and biochemical 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Model.","date":"2020","source":"Vaccines","url":"https://pubmed.ncbi.nlm.nih.gov/31936739","citation_count":4,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["EXP1","exported protein 1"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"35214758","id":"PMC_35214758","title":"An Attenuated HSV-1-Derived Malaria Vaccine Expressing Liver-Stage Exported Proteins Induces Sterilizing Protection against Infectious Sporozoite Challenge.","date":"2022","source":"Vaccines","url":"https://pubmed.ncbi.nlm.nih.gov/35214758","citation_count":4,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["EXP1"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"31364224","id":"PMC_31364224","title":"A crucial role for the C-terminal domain of exported protein 1 during the mosquito and hepatic stages of the Plasmodium berghei life cycle.","date":"2019","source":"Cellular microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/31364224","citation_count":4,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["EXP1","exported protein 1","PbEXP1"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"17303242","id":"PMC_17303242","title":"Identification of minimal CD8+ and CD4+ T cell epitopes in the Plasmodium yoelii hepatocyte erythrocyte protein 17kDa.","date":"2007","source":"Molecular immunology","url":"https://pubmed.ncbi.nlm.nih.gov/17303242","citation_count":4,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["exported protein 1","PfEXP1"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"27301339","id":"PMC_27301339","title":"Intranasal immunization with a peptide conjugated to Salmonella flagellin induces both systemic and mucosal peptide-specific antibody responses in mice.","date":"2016","source":"Microbiology and immunology","url":"https://pubmed.ncbi.nlm.nih.gov/27301339","citation_count":4,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["exported protein 1"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"35697275","id":"PMC_35697275","title":"Cyclic constrained immunoreactive peptides from crucial P. falciparum proteins: potential implications in malaria diagnostics.","date":"2022","source":"Translational research : the journal of laboratory and clinical medicine","url":"https://pubmed.ncbi.nlm.nih.gov/35697275","citation_count":3,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["EXP1"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"8825207","id":"PMC_8825207","title":"Identification of a Plasmodium berghei antigen sharing common features with P. falciparum and P. chabaudi parasitophorous-vacuole membrane antigens.","date":"1996","source":"Parasitology research","url":"https://pubmed.ncbi.nlm.nih.gov/8825207","citation_count":3,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["EXP1"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"9729542","id":"PMC_9729542","title":"Immune response against the exp-1 protein of Plasmodium falciparum results in antibodies that cross-react with human T-cell lymphotropic virus type 1 proteins.","date":"1998","source":"Clinical and diagnostic laboratory immunology","url":"https://pubmed.ncbi.nlm.nih.gov/9729542","citation_count":3,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["EXP1"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"12572082","id":"PMC_12572082","title":"[Cloning and sequence analysis of exp-1 gene of Plasmodium falciparum FCC1/HN].","date":"2001","source":"Zhongguo ji sheng chong xue yu ji sheng chong bing za zhi = Chinese journal of parasitology & parasitic diseases","url":"https://pubmed.ncbi.nlm.nih.gov/12572082","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["EXP1"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":35019,"output_tokens":6448,"usd":0.100889,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":13679,"output_tokens":4828,"usd":0.094548,"stage2_stop_reason":"end_turn"},"total_usd":0.195437,"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\": 1987,\n      \"finding\": \"EXP1 (exp-1) is exported from P. falciparum parasites into a new compartment within the host erythrocyte; the gene contains two introns and is highly conserved across parasite lines, suggesting an important function.\",\n      \"method\": \"Monoclonal antibody localization, gene cloning and sequencing\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — monoclonal antibody-based localization and gene characterization, single lab but multiple isolates examined\",\n      \"pmids\": [\"2438130\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1985,\n      \"finding\": \"EXP1 is a ~23 kDa blood-stage protein with a signal peptide and an internal hydrophobic transmembrane anchor sequence; it shares antigenic determinants with sporozoites due to tetrapeptide repeats related to the circumsporozoite protein.\",\n      \"method\": \"cDNA cloning, nucleotide sequencing, affinity-purified antibody immunoassay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — sequence-based structural inference plus immunological cross-reactivity, single lab\",\n      \"pmids\": [\"2410913\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"EXP1 is an integral membrane protein: in a cell-free translation-translocation system it was inserted into canine pancreatic microsomes with its N-terminus protected from proteinase K (facing the lumen) and its C-terminus exposed. In vivo, EXP1 is alkali-resistant (membrane-integrated) and segment-specific antibodies confirm the N-terminus faces the vesicle interior while the C-terminus is protease-accessible, consistent with a single-pass topology.\",\n      \"method\": \"Cell-free translation/translocation into microsomes, proteinase K protection assay, alkaline extraction, segment-specific monoclonal antibodies\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with protease protection plus orthogonal in vivo alkaline extraction and topology probing in multiple experiments\",\n      \"pmids\": [\"1852170\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"EXP1 is located at the parasitophorous vacuole membrane (PVM) and in membrane-bound compartments in the erythrocyte cytoplasm; a second exported protein (EXP-2, 35 kDa) co-localizes with EXP1 at these sites.\",\n      \"method\": \"Monoclonal antibody co-localization, membrane fractionation, detergent solubilization, alkali extraction\",\n      \"journal\": \"Parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-localization and fractionation data from single lab, multiple biochemical methods\",\n      \"pmids\": [\"8058359\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"EXP1 concentrates in membrane domains on the periphery of the parasite and in the tubovesicular membrane network (TVN), as shown by simultaneous lipid and protein fluorescence imaging; its distribution is distinct from a 45 kDa Maurer's cleft protein, indicating domain segregation within the TVN.\",\n      \"method\": \"High-resolution confocal microscopy with fluorescent sphingolipid labeling and immunostaining\",\n      \"journal\": \"Experimental parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single-lab localization study, no functional consequence directly tested\",\n      \"pmids\": [\"7957747\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The N-terminal signal sequence of EXP1, when fused to GFP, directs the chimeric protein to the parasitophorous vacuole (default secretory destination) in transfected parasites; some chimeric protein is redirected to the food vacuole. FRAP studies revealed that the PV contains subcompartments that are only partially interconnected.\",\n      \"method\": \"Transfection of GFP chimeras, live fluorescence microscopy, photobleaching (FRAP), dual lipid labeling\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct live-cell imaging with FRAP and dual labeling in transfected parasites, multiple orthogonal approaches\",\n      \"pmids\": [\"12456681\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"EXP1 and ETRAMP family proteins are both PVM-resident, but ETRAMPs (positively charged) and EXP1 (negatively charged integral PVM protein) define separate PVM domains, suggesting functionally distinct microdomains with oppositely charged surface coats. Stage-specific expression of ETRAMPs coincides with morphological changes in development.\",\n      \"method\": \"Northern and Western blotting, colocalization by fluorescence microscopy, selective permeabilization, immunoelectron microscopy\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — immunoelectron microscopy and selective permeabilization confirm PVM location, EXP1 used as comparator, single lab\",\n      \"pmids\": [\"12686607\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"EXP1 is a component of a continuous membrane network of parasite origin in the erythrocyte cytoplasm (comprising TVM, Maurer's clefts, and membrane whorls), as shown by co-localization at light and electron microscopy levels; small vesicles (15–25 nm) were observed at sites where this network contacts the erythrocyte plasma membrane.\",\n      \"method\": \"Immunofluorescence and immunoelectron microscopy, vital staining with LysoSensor Green\",\n      \"journal\": \"European journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-localization at two levels of microscopy, single lab\",\n      \"pmids\": [\"12868595\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"EXP1 (PfEXP1), together with internalized host membrane proteins, can be detected in detergent-resistant membrane (DRM) raft fractions within the parasitophorous vacuole, indicating that lipid rafts are present at the PVM.\",\n      \"method\": \"Detergent-resistant membrane (DRM) fractionation, Western blotting\",\n      \"journal\": \"International journal for parasitology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — biochemical fractionation only, single lab, no direct functional consequence established\",\n      \"pmids\": [\"11566306\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"In vivo cross-linking in asexual P. falciparum stages revealed that EXP1 and ETRAMP family members form oligomeric arrays in the PVM; each ETRAMP and EXP1 define separate, non-overlapping arrays (microdomains). Recombinant ETRAMPs oligomerize independently in bacterial membranes, but EXP1 arrays are distinct from ETRAMP arrays.\",\n      \"method\": \"In vivo chemical cross-linking, recombinant protein expression in bacterial membranes, immunofluorescence microscopy\",\n      \"journal\": \"Molecular microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo cross-linking plus bacterial membrane reconstitution, single lab, two orthogonal methods\",\n      \"pmids\": [\"16420351\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"EXP1 functions as a membrane glutathione S-transferase (mGST): it efficiently degrades cytotoxic hematin in vitro and is potently inhibited by artesunate (nanomolar potency). EXP1 is associated with artesunate metabolism and susceptibility in drug-pressured parasites, implicating it in the mode of action of artesunate.\",\n      \"method\": \"Computational network analysis (supergenomic compression) for prediction; in vitro GST activity assay with hematin substrate; artesunate inhibition assay; drug-pressured parasite metabolic profiling\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro enzymatic assay with substrate and inhibitor characterization, but single lab and later challenged by conditional KO studies\",\n      \"pmids\": [\"25126794\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"EXP1 is a dynamic PVM protein during liver-stage infection; torins block trafficking of EXP1 to the liver-stage PVM, leading to parasite elimination by the hepatocyte. This effect is specific to liver stage and distinct from blood-stage action.\",\n      \"method\": \"Immunofluorescence microscopy of liver-stage parasites treated with torins, in vitro and in vivo parasite viability assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct imaging of protein trafficking block with functional parasite death readout, in vitro and in vivo corroboration\",\n      \"pmids\": [\"23836641\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The C-terminal region of EXP1 binds host Apolipoprotein H (ApoH) during hepatic Plasmodium development. Expression of a C-terminally truncated EXP1 missing the ApoH-interaction site, or siRNA knockdown of ApoH in hepatic cells or mouse livers, impairs intrahepatic parasite development. Infection of mice with sporozoites expressing truncated EXP1 reduces liver burden and delays blood-stage patency.\",\n      \"method\": \"Protein interaction mapping, truncation mutants, RNA interference (siRNA) knockdown of ApoH in cells and mice, in vivo sporozoite challenge with mutant parasites\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal genetic and cell biological approach (truncation mutant + host gene RNAi) with in vivo validation, multiple orthogonal methods\",\n      \"pmids\": [\"28137845\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Trafficking of EXP1 to the PVM is independent of the folding state of the protein and continues unabated upon inactivation of the PTEX translocon, indicating that PVM membrane protein trafficking occurs by a mechanism distinct from PTEX-mediated protein export.\",\n      \"method\": \"Transfection with misfolded EXP1 constructs, conditional PTEX inactivation, fluorescence microscopy to track PVM localization\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct genetic and pharmacological perturbation of trafficking pathway, single lab\",\n      \"pmids\": [\"27892646\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"EXP1 recombinant protein shows potent in vitro inhibition of membrane glutathione S-transferase activity by chloroquine (IC50 ~9 nM with hematin substrate; ~19 nM with CDNB), suggesting chloroquine may inhibit EXP1 mGST activity without requiring iron-dependent activation.\",\n      \"method\": \"In vitro GST activity assay with recombinant EXP1, hematin and CDNB substrates, chloroquine inhibition dose-response\",\n      \"journal\": \"International journal for parasitology. Drugs and drug resistance\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro biochemical assay only with recombinant protein, single lab, no in vivo confirmation\",\n      \"pmids\": [\"29324251\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"3D7\"}]\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"EXP1 is initially localized to dense granules in P. falciparum merozoites (co-localizing with RESA) and is translocated to the PVM after erythrocyte invasion, as confirmed by immunofluorescence and immunoelectron microscopy.\",\n      \"method\": \"Immunofluorescence assay (IFA) with anti-EXP1 and anti-RESA antibodies, immunoelectron microscopy\",\n      \"journal\": \"Parasitology international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two orthogonal microscopy methods (IFA + immunoEM) demonstrating pre-invasion dense granule localization and post-invasion PVM translocation\",\n      \"pmids\": [\"29886341\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"BioID proximity labeling using EXP1 fused to BirA* in P. berghei blood-stage parasites identified 61 known and candidate PVM proteins, validating EXP1 as a PVM resident suitable as a BioID anchor and expanding the PVM proteome.\",\n      \"method\": \"BioID (proximity biotinylation with BirA* fused to EXP1), affinity purification, LC-MS/MS, label-free quantitation\",\n      \"journal\": \"mSphere\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proximity labeling mass spectrometry with EXP1 as bait confirms PVM localization and identifies interacting proteins, single lab\",\n      \"pmids\": [\"29404413\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"EXP1 is essential for P. falciparum intraerythrocytic survival. Conditional knockout of EXP1 abolishes the nutrient-permeable channel activity at the PVM (measured by patch-clamp) and disrupts the correct localization of EXP2 (a pore-forming protein required for nutrient-permeable channel and protein export). Loss of EXP1 impairs only the nutrient-permeable channel activity, not protein export via PTEX. Parasites with reduced EXP1 become hypersensitive to low nutrient conditions, confirming EXP1 is specifically required for functional expression of EXP2 as a nutrient-permeable channel.\",\n      \"method\": \"Conditional knockout (DiCre-based), patch-clamp electrophysiology of PVM, immunofluorescence microscopy of EXP2 localization, nutrient deprivation survival assay\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — conditional KO with patch-clamp electrophysiology and localization studies, multiple orthogonal methods, rigorous controls\",\n      \"pmids\": [\"31568532\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The GST activity previously attributed to EXP1 cannot account for its essential function in vivo, as conditional knockdown recapitulated the essential phenotype independently of any GST activity.\",\n      \"method\": \"Conditional knockdown (TetR-DOZI-aptamer system), intraerythrocytic growth assays\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional knockdown with specific growth phenotype, single lab, negative result regarding GST function\",\n      \"pmids\": [\"31990132\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"EXP1 is required for proper organization of EXP2 within the PVM. EXP1 knockdown causes profound changes in vacuole ultrastructure (increased PVM–parasite plasma membrane separation, abnormal membrane structures) and substantially alters EXP2 distribution but does not affect HSP101 (unfoldase) distribution or PTEX translocon activity.\",\n      \"method\": \"CRISPR/Cpf1-based installation of TetR-DOZI-aptamer conditional knockdown, BioID2 proximity labeling at PVM, immunofluorescence and ultrastructural electron microscopy\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional knockdown with BioID proteomics, immunofluorescence, and ultrastructural EM, multiple orthogonal methods\",\n      \"pmids\": [\"31990132\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In P. berghei, the N-terminal domain of EXP1 is essential for parasite blood-stage survival, while the C-terminal (CT) domain is required for normal mosquito-stage development and for correct EXP1 localization to the PVM in intrahepatic parasites; truncation of the CT domain severely limits hepatic replication and prevents egress into the blood.\",\n      \"method\": \"CRISPR-based truncation mutants of PbEXP1, mouse infection models, immunofluorescence microscopy\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — domain-specific genetic truncation with in vivo multi-stage phenotyping and localization analysis\",\n      \"pmids\": [\"31364224\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"The signal sequence of EXP1, when fused to PfHRPI, diverts HRPI away from the microsomal translocation machinery, demonstrating that the EXP1 signal sequence actively engages the ER translocation pathway and can redirect other proteins to it.\",\n      \"method\": \"Cell-free translation-translocation assay with chimeric constructs in pancreatic microsomes\",\n      \"journal\": \"Novartis Foundation symposium\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro reconstitution assay, single lab, functional consequence of signal sequence established\",\n      \"pmids\": [\"10645548\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"EXP1 protein is expressed in P. falciparum liver-stage parasites, not only blood stages, as demonstrated by immunofluorescence staining of infected hepatocytes.\",\n      \"method\": \"Immunofluorescence assay of infected hepatocytes\",\n      \"journal\": \"Experimental parasitology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single immunofluorescence study, localization without functional follow-up\",\n      \"pmids\": [\"8050527\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"The P. yoelii ortholog of EXP1 (PyHEP17) shares 37% amino acid identity with PfEXP1, has a similar expression pattern in hepatocytes and erythrocytes, and shows antigenic cross-reactivity; immunization with PyHEP17 induces protective antibodies and CTLs in mice, establishing the P. falciparum EXP1 as the functional homolog.\",\n      \"method\": \"Gene cloning and sequencing, immunological cross-reactivity assays, mouse immunization and protection studies\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — sequence homology supported by cross-reactive antibody and protective immunization data across species\",\n      \"pmids\": [\"8663412\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium yoelii\", \"strain\": \"\"}, {\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"A 43 kDa P. berghei antigen sharing immunological cross-reactivity with PfEXP1 was identified at the parasite surface; antisense phosphorothioate oligodeoxynucleotides targeting exp-1 mRNA inhibited P. falciparum development in vitro by 47% and extended lifespan of P. berghei-infected mice by 2–4-fold, suggesting EXP1 is functionally important for parasite survival.\",\n      \"method\": \"Cross-reactive antibody localization, antisense oligodeoxynucleotide inhibition in vitro and in vivo mouse experiments\",\n      \"journal\": \"Parasitology research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — antisense inhibition approach with indirect phenotype readout, single lab, limited mechanistic resolution\",\n      \"pmids\": [\"8825207\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}, {\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"current_model\": \"EXP1 (PF3D7_1121600) is an essential, single-pass integral membrane protein of the parasitophorous vacuole membrane (PVM) that is initially stored in dense granules of merozoites and translocated to the PVM after erythrocyte invasion; its N-terminal signal sequence engages the ER translocation machinery and directs secretion to the PV, while its C-terminal domain mediates interaction with host Apolipoprotein H during liver-stage development and is required for correct PVM localization in hepatic parasites; at the PVM, EXP1 forms oligomeric microdomains separate from ETRAMP arrays, is required for the correct localization and function of EXP2 as the nutrient-permeable channel (demonstrated by patch-clamp after conditional knockout), and thereby enables nutrient acquisition by intraerythrocytic parasites, a role that is independent of a previously proposed but in-vivo-dispensable glutathione S-transferase activity.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"EXP1 (PF3D7_1121600) is an essential, single-pass integral membrane protein of the parasitophorous vacuole membrane (PVM) that is required for nutrient acquisition by intraerythrocytic Plasmodium parasites [#17]. It is synthesized as a ~23 kDa protein bearing an N-terminal signal sequence and an internal hydrophobic anchor, and adopts a defined single-pass topology with its N-terminus in the vesicle lumen and its C-terminus exposed to the cytoplasmic face [#1, #2]. Its signal sequence actively engages the ER translocation machinery and directs the protein along the default secretory route to the parasitophorous vacuole [#5, #21], with trafficking to the PVM occurring independently of the PTEX protein-export translocon and independent of the folding state of the protein [#13]. In P. falciparum merozoites, EXP1 is first stored in dense granules and is translocated to the PVM after erythrocyte invasion [#15], where it forms oligomeric arrays that occupy microdomains distinct from those of ETRAMP family proteins [#9, #6]. Conditional knockout demonstrates that EXP1 is required for the correct organization and function of EXP2 as the PVM nutrient-permeable channel: loss of EXP1 abolishes channel activity measured by patch-clamp and renders parasites hypersensitive to low nutrient conditions, while leaving PTEX-mediated protein export intact [#17, #19]. A previously proposed membrane glutathione S-transferase activity that degrades hematin and is inhibited by artesunate [#10] does not account for the essential in vivo function of EXP1, since conditional knockdown recapitulates the essential phenotype independently of GST activity [#18]. In liver stages, the C-terminal domain of EXP1 binds host Apolipoprotein H and is required for correct PVM localization and intrahepatic development, as shown in P. berghei by truncation mutants and host ApoH knockdown [#12, #20].\",\n  \"teleology\": [\n    {\n      \"year\": 1987,\n      \"claim\": \"Establishing that EXP1 is exported beyond the parasite into a new host-cell compartment defined it as a secreted/exported antigen and raised the question of its destination and function.\",\n      \"evidence\": \"Monoclonal antibody localization plus gene cloning and sequencing in P. falciparum\",\n      \"pmids\": [\"2438130\", \"2410913\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Precise membrane compartment not yet resolved\", \"Molecular function unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1991,\n      \"claim\": \"Determining that EXP1 is an integral membrane protein with a fixed single-pass topology (N-terminus luminal, C-terminus exposed) set the structural framework for how its two domains face different environments.\",\n      \"evidence\": \"Cell-free translation/translocation into microsomes with proteinase K protection, alkaline extraction, and segment-specific antibodies in P. falciparum\",\n      \"pmids\": [\"1852170\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Function of each domain not established\", \"Oligomeric state in native membrane not addressed\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Pinpointing EXP1 to the PVM and to exported membrane networks (TVN/tubovesicular membrane) — and showing it segregates from other exported proteins and co-resides with EXP-2 — localized the protein to its site of action and hinted at organized membrane microdomains.\",\n      \"evidence\": \"Monoclonal antibody co-localization, membrane fractionation, and confocal lipid/protein imaging in P. falciparum; liver-stage expression by immunofluorescence\",\n      \"pmids\": [\"8058359\", \"7957747\", \"8050527\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of domain segregation not tested\", \"Relationship between EXP1 and EXP-2 not mechanistically defined\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Cross-species orthology (PyHEP17, P. berghei antigen) and antisense/immunization phenotypes provided the first functional evidence that EXP1 matters for parasite survival and protective immunity.\",\n      \"evidence\": \"Ortholog cloning, cross-reactive antibodies, mouse immunization/protection, and antisense oligonucleotide inhibition in P. yoelii, P. berghei and P. falciparum\",\n      \"pmids\": [\"8663412\", \"8825207\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Antisense phenotype is indirect with limited mechanistic resolution\", \"Molecular basis of essentiality not identified\"],\n      \"attribution\": [{\"species\": \"Plasmodium yoelii\", \"strain\": \"\"}, {\"species\": \"Plasmodium berghei\", \"strain\": \"\"}, {\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Showing the EXP1 signal sequence directs GFP chimeras to the PV by default and can redirect other proteins into the ER translocation pathway defined how EXP1 is trafficked and revealed subcompartmentation within the PV.\",\n      \"evidence\": \"GFP-chimera transfection with FRAP and dual lipid labeling, and cell-free translocation of chimeric constructs in P. falciparum\",\n      \"pmids\": [\"12456681\", \"10645548\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo trafficking route to PVM not yet distinguished from other pathways\", \"Determinants of PV subcompartmentation unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Demonstrating that EXP1 forms oligomeric arrays occupying microdomains distinct from ETRAMP arrays established that the PVM is organized into segregated protein assemblies rather than a homogeneous membrane.\",\n      \"evidence\": \"In vivo chemical cross-linking, recombinant expression in bacterial membranes, and immunofluorescence in P. falciparum; earlier charge-based domain comparison\",\n      \"pmids\": [\"16420351\", \"12686607\", \"12868595\", \"11566306\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional role of EXP1 oligomers not defined\", \"Composition of EXP1 microdomains not resolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Assigning EXP1 a membrane glutathione S-transferase activity that degrades hematin and is inhibited by artesunate proposed an enzymatic role linked to antimalarial drug action.\",\n      \"evidence\": \"Computational prediction, in vitro GST assay with hematin substrate, and artesunate inhibition/drug-pressure profiling in P. falciparum\",\n      \"pmids\": [\"25126794\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vitro enzymatic activity not shown to explain in vivo essentiality\", \"Physiological relevance later challenged by conditional knockout\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Mapping a C-terminal EXP1 interaction with host Apolipoprotein H, and showing PVM trafficking is PTEX-independent, defined a liver-stage host-interaction function and separated EXP1 delivery from the canonical protein-export route.\",\n      \"evidence\": \"Interaction mapping, C-terminal truncation mutants, ApoH siRNA knockdown and in vivo sporozoite challenge in P. berghei; misfolded-construct and conditional PTEX-inactivation trafficking in P. falciparum; liver-stage trafficking block by torins\",\n      \"pmids\": [\"28137845\", \"27892646\", \"23836641\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular consequence of ApoH binding for parasite development not fully defined\", \"Trafficking machinery that delivers EXP1 to the PVM not identified\"],\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}, {\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Localizing EXP1 to dense granules pre-invasion and validating it as a PVM BioID anchor clarified its delivery route and enabled proteomic mapping of the PVM neighborhood.\",\n      \"evidence\": \"IFA/immunoEM co-localization with RESA in P. falciparum merozoites; BioID proximity labeling with EXP1-BirA* in P. berghei blood stages\",\n      \"pmids\": [\"29886341\", \"29404413\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Which BioID-identified proteins are direct EXP1 partners not determined\", \"Mechanism of dense-granule-to-PVM translocation unresolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}, {\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Conditional genetics resolved the essential function: EXP1 is required for the correct localization and channel function of EXP2, hence for PVM nutrient uptake, and its essentiality is independent of the earlier-proposed GST activity; domain analysis separated blood-stage from mosquito/liver-stage requirements.\",\n      \"evidence\": \"DiCre conditional knockout with PVM patch-clamp and EXP2 localization, TetR-DOZI/CRISPR-Cpf1 conditional knockdown with BioID and ultrastructural EM in P. falciparum; CRISPR domain-truncation multi-stage phenotyping in P. berghei\",\n      \"pmids\": [\"31568532\", \"31990132\", \"31364224\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism by which EXP1 organizes EXP2 not defined\", \"Whether EXP1 physically contacts EXP2 in the channel not established\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}, {\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How EXP1 oligomers physically organize EXP2 into a functional nutrient-permeable channel, and what the structural basis of this interaction is, remain unresolved.\",\n      \"evidence\": \"No structural or reconstitution study of the EXP1–EXP2 assembly is present in the corpus\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structure of EXP1 or the EXP1/EXP2 assembly\", \"Direct physical interaction with EXP2 not demonstrated\", \"Mechanism linking EXP1 microdomains to channel function unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0004364\", \"supporting_discovery_ids\": [10, 14]},\n      {\"term_id\": \"GO:0042803\", \"supporting_discovery_ids\": [9]},\n      {\"term_id\": \"GO:0005515\", \"supporting_discovery_ids\": [12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0020005\", \"supporting_discovery_ids\": [3, 6, 16, 17]},\n      {\"term_id\": \"GO:0016021\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0020020\", \"supporting_discovery_ids\": [4, 7]},\n      {\"term_id\": \"GO:0020023\", \"supporting_discovery_ids\": [15]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0015893\", \"supporting_discovery_ids\": [17]},\n      {\"term_id\": \"GO:0006886\", \"supporting_discovery_ids\": [5, 13, 21]}\n    ],\n    \"complexes\": [\n      \"EXP1 oligomeric PVM microdomain arrays (distinct from ETRAMP arrays) [#9]\"\n    ],\n    \"partners\": [\n      \"EXP2 (functional/organizational dependency; EXP1 required for correct EXP2 localization and nutrient-permeable channel activity) [#17, #19]\",\n      \"Host Apolipoprotein H (ApoH), bound via the EXP1 C-terminal domain in liver stage [#12]\",\n      \"EXP-2 (co-localization at PVM) [#3]\"\n    ],\n    \"other_free_text\": [\n      \"Single-pass integral membrane topology: N-terminus luminal, C-terminus cytoplasmic [#2]\",\n      \"N-terminal signal sequence directs secretion to the PV via the ER translocation pathway [#5, #21]\",\n      \"Trafficking to the PVM is PTEX-independent and folding-state-independent [#13]\",\n      \"Stored in dense granules of merozoites, translocated to PVM after invasion [#15]\",\n      \"N-terminal domain essential for blood-stage survival; C-terminal domain required for mosquito- and liver-stage development and hepatic PVM localization (P. berghei) [#20]\",\n      \"Proposed membrane GST/hematin-degrading activity inhibited by artesunate and chloroquine in vitro, but this activity does not account for essential in vivo function [#10, #14, #18]\",\n      \"Expressed in both blood and liver stages; P. yoelii ortholog PyHEP17 (37% identity) confers protective immunity in mice [#22, #23]\"\n    ]\n  }\n}","audit_flag":null,"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_1121600","name":null,"product":"exported protein 1","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PbANKA","gene_id":"PBANKA_0926700","name":null,"product":"exported protein 1","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_0919300","name":null,"product":"exported protein 1, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"EXP1","evaluation":null}