{"gene":"PF3D7_1116800","run_date":"2026-09-08T12:51:28","timeline":{"discoveries":[{"year":2009,"finding":"HSP101 (PF3D7_1116800) was identified as a component of the Plasmodium translocon of exported proteins (PTEX) located in the parasitophorous vacuole membrane of P. falciparum. HSP101 is a ClpA/B-like AAA+ ATPase that forms part of an ATP-powered complex together with PTEX150 and EXP2, implicated in protein export across the vacuolar membrane.","method":"Co-immunoprecipitation, mass spectrometry, immunofluorescence, immunoelectron microscopy","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP and MS identification of complex components, replicated in multiple subsequent studies","pmids":["19536257"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2012,"finding":"HSP101 is synthesized during the schizont stage and, prior to invasion, resides within the dense granules of invasive merozoites. After invasion, HSP101 is released into the parasitophorous vacuole membrane where it assembles as part of a stable macromolecular complex of >1230 kDa, with little turnover for most of the erythrocytic cycle. Biochemical fractionation supports an EXP2–PTEX150–HSP101 arrangement within the complex.","method":"Immunofluorescence, subcellular fractionation, blue native PAGE, immunoelectron microscopy","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal localization and biochemical methods, consistent with independent studies","pmids":["22253438"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2013,"finding":"Repeated attempts to delete HSP101 in P. berghei failed, indicating that HSP101 is essential for blood-stage parasite development. This genetic essentiality is consistent with an obligatory role in protein export.","method":"Reverse genetics (attempted gene deletion in P. berghei)","journal":"Molecular microbiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — negative result from targeted gene deletion attempts, consistent across multiple attempts and corroborated by P. berghei study (PMID:24076174)","pmids":["23869529","24076174"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2014,"finding":"Conditional knockdown of HSP101 in P. falciparum caused a nearly complete block in export of all classes of exported proteins (PEXEL and PEXEL-negative), with substrates accumulating in the vacuole in both asexual and sexual parasites. Under export-blocked conditions, association between HSP101 and other PTEX components was lost, indicating complex integrity is required for efficient export.","method":"Chaperone auto-inhibition (dominant-negative strategy), immunofluorescence, protein export assays, co-immunoprecipitation","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — rapid reversible functional ablation with multiple orthogonal readouts, confirmed by parallel study (PMID:25043043)","pmids":["25043010"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2014,"finding":"Conditional knockdown of HSP101 (or PTEX150) greatly reduced trafficking of all classes of exported proteins across the double-membrane barrier in P. falciparum, including PEXEL proteins, PNEPs, and the virulence factor PfEMP1. Even modest knockdown strongly impaired blood-stage growth in vitro and in vivo.","method":"Inducible knockdown (conditional mutagenesis), flow cytometry, immunofluorescence, in vitro and in vivo growth assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional knockdown with multiple orthogonal export readouts, confirmed by parallel study (PMID:25043010)","pmids":["25043043"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2014,"finding":"HSP101 (PF3D7_1116800) was identified as a substrate of P. falciparum signal peptide peptidase (PfSPP) using a transfection-based in vivo luminescence assay, establishing intramembrane proteolytic cleavage of HSP101 by PfSPP at the endoplasmic reticulum.","method":"Transfection-based in vivo luminescence assay, bioinformatics substrate screen","journal":"Biochemical and biophysical research communications","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single method, limited mechanistic follow-up","pmids":["25017910"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2015,"finding":"Live cell imaging of endogenously fluorescence-tagged HSP101 in P. berghei revealed that HSP101 localizes to motile tubular extensions of the parasitophorous vacuole that protrude from the parasite into the red blood cell, most prominently during trophozoite growth. Distinct spatiotemporal expression during sporogony and liver-stage development indicates additional functions across the life cycle.","method":"Live cell fluorescence microscopy, correlative light and electron microscopy (CLEM), endogenous fluorescent tagging","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live imaging with endogenous tagging, single lab, two orthogonal microscopy methods","pmids":["26219962"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2015,"finding":"HSP101 could not be detected during early liver stages of P. berghei infection, suggesting that the absence of HSP101 (the putative molecular motor of PTEX) may explain the lack of direct protein translocation of PEXEL-bearing reporters into the hepatocyte cytosol during liver-stage infection.","method":"Immunofluorescence, transgenic reporter export assays in liver stage","journal":"Cellular microbiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct immunofluorescence detection, consistent with genetic rescue data from PMID:34956312","pmids":["26347246"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2018,"finding":"Cryo-electron microscopy of the endogenous PTEX core complex from P. falciparum at near-atomic resolution revealed that HSP101 forms a spiral-shaped AAA+ hexamer tethered above the EXP2-PTEX150 funnel-shaped channel. In the 'resetting' state, HSP101 undergoes pronounced compaction allowing three of six tyrosine-bearing pore loops lining the HSP101 channel to dissociate from cargo, resetting the translocon for the next threading cycle. Structures were captured in 'engaged' and 'resetting' states of cargo translocation using CRISPR-Cas9-inserted epitope tags.","method":"Cryo-electron microscopy (near-atomic resolution), CRISPR-Cas9 epitope tagging, endogenous complex isolation","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — near-atomic cryo-EM structure of endogenous complex with multiple conformational states, rigorous structural and functional validation","pmids":["30150771"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2018,"finding":"Inactivation of HSP101 (the AAA+ ATPase component of PTEX) arrests protein export across the parasitophorous vacuolar membrane, establishing HSP101 as required for the protein-conducting function of EXP2 but not for EXP2's independent nutrient channel activity.","method":"Regulated gene expression, functional protein export assays, cell-attached patch-clamp","journal":"Nature microbiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — orthogonal methods (conditional knockdown + electrophysiology), consistent with prior studies","pmids":["30150733"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2018,"finding":"When export cargo is blocked from unfolding, loop-like extensions appear at the parasitophorous vacuole membrane containing trapped cargo and EXP2 but not HSP101 or PTEX150, indicating that HSP101 and PTEX150 remain in the main PTEX-containing export zones while EXP2 can be spatially segregated with stalled cargo.","method":"Fluorescence microscopy with inducible folding reporters (mouse DHFR domains), immunofluorescence","journal":"Traffic (Copenhagen, Denmark)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — inducible reporter system with microscopic readout, single lab","pmids":["29696751"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2018,"finding":"Proteomic analysis showed that PTEX88 interacts most closely with HSP101 within the PTEX complex, with weaker affinity for other core PTEX constituents (EXP2, PTEX150), establishing HSP101 as the primary interaction partner of PTEX88 within the translocon.","method":"Immunoprecipitation, quantitative mass spectrometry (interactome/proteomics)","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MS-based interactome from IP, single lab","pmids":["29637707"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2019,"finding":"Transgenic P. falciparum parasites were generated in which the unfoldase and threading/translocation functions of HSP101 were uncoupled. These parasites could export native proteins but were unable to translocate tightly folded soluble PEXEL-bearing reporter proteins across the PVM. In contrast, an identical reporter with a transmembrane domain could be exported, demonstrating that (1) HSP101 serves as the unfoldase for soluble cargo requiring translocation, and (2) proteins with transmembrane domains use an alternative unfolding pathway prior to PTEX.","method":"Transgenic parasite generation (uncoupled unfoldase mutants), reporter export assays, immunofluorescence","journal":"mBio","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct mutagenesis uncoupling two activities with multiple reporter substrates, single lab but rigorous","pmids":["31164473"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2020,"finding":"Although EXP1 knockdown caused profound vacuole ultrastructure defects and altered EXP2 distribution in the PVM, the distribution of the HSP101 unfoldase was not substantially altered, indicating that EXP1 is specifically required for organizing EXP2 but not HSP101 within the vacuole membrane.","method":"Conditional knockdown (TetR-DOZI-aptamers), immunofluorescence, electron microscopy, BioID proximity labeling","journal":"Cellular microbiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional knockdown with multiple imaging readouts, single lab","pmids":["31990132"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2021,"finding":"Transgenic P. berghei parasites restored with liver-stage HSP101 expression (via ptex150 or ef1α promoter) completed the life cycle but failed to export PEXEL-proteins in early liver stages, demonstrating that HSP101 alone is insufficient to reconstitute PTEX-dependent export in early liver stages, implicating additional missing PTEX components or alternative liver-stage export complexes.","method":"Transgenic parasite generation (promoter swap, additional gene copy), PEXEL reporter export assays in liver stage","journal":"Frontiers in genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic rescue experiment with reporter readout, single lab","pmids":["34956312"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2022,"finding":"HSP101 localizes both within the parasitophorous vacuole and within the parasite's ER throughout ring and trophozoite stages. HSP101 forms specific interactions with model PEXEL proteins in the ER irrespective of their PEXEL processing status, suggesting that HSP101 functions as a chaperone that recognizes and escorts PEXEL proteins from the ER to the parasitophorous vacuole. Additionally, EXP2 and PTEX150 form a stable subcomplex that facilitates HSP101 docking at the PVM.","method":"Immunofluorescence (localization), co-immunoprecipitation (protein interactions), transgenic parasite lines","journal":"PLoS pathogens","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and immunofluorescence with multiple constructs, single lab, two orthogonal methods","pmids":["35192672"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2022,"finding":"Transient knockdown of HSP101 (in HSP101-DDDHA parasites) decreased hemoglobin uptake inside P. falciparum parasites, suggesting a role for the HSP101-containing PTEX complex at the parasitophorous vacuole membrane in hemoglobin uptake.","method":"Conditional knockdown (DDDHA destabilization domain), hemoglobin uptake assays","journal":"FASEB bioAdvances","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single knockdown experiment, single lab, indirect readout, limited mechanistic follow-up","pmids":["36238365"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2023,"finding":"Using the knockER system (DiCre-mediated ER sequestration via inducible KDEL fusion), vacuolar levels of HSP101 were shown to be maintained in excess of what is required to sustain effector protein export into the erythrocyte. Vacuole depletion of HSP101 hypersensitized parasites to a destabilization tag that inhibits HSP101-PTEX complex formation, but not to translational knockdown of the entire HSP101 pool, demonstrating compartment-specific functional excess of HSP101.","method":"DiCre-mediated knock-sideways (knockER), conditional ER retrieval, protein export assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — novel genetic tool with orthogonal knockdown comparison, single lab","pmids":["37552754"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2023,"finding":"The downstream 'spacer' region separating the PEXEL motif from the folded functional domain of an exported protein must be of sufficient length and permissive amino acid composition to engage the HSP101 unfoldase component of PTEX for efficient translocation into the red blood cell. The conserved P2' E/Q/D residue of the PEXEL motif also has a dual role: first for plasmepsin V cleavage in the ER, and second for efficient PTEX-mediated (HSP101-dependent) export across the PVM.","method":"Transgenic reporter export assays, PEXEL mutant analysis, conditional knockdown","journal":"Traffic (Copenhagen, Denmark)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple reporter constructs with defined mutations, single lab","pmids":["37926971"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"current_model":"HSP101 (PF3D7_1116800) is a ClpB-like AAA+ ATPase and essential core component of the Plasmodium translocon of exported proteins (PTEX) at the parasitophorous vacuole membrane; it forms a spiral hexamer that uses tyrosine-bearing pore loops to thread and unfold cargo proteins for translocation across the vacuolar membrane, is delivered to the PVM from merozoite dense granules, chaperones PEXEL-motif proteins from the ER to the vacuole for PTEX docking, and is present in excess in the vacuole relative to the minimum required for export, with its unfoldase activity specifically required for soluble tightly-folded substrates but dispensable for transmembrane-domain-containing cargo that accesses an alternative unfolding pathway."},"narrative":{"mechanistic_narrative":"HSP101 (PF3D7_1116800) is a ClpA/B-like AAA+ ATPase that serves as the essential motor subunit of the Plasmodium translocon of exported proteins (PTEX), the machine that drives export of parasite effector proteins across the parasitophorous vacuole membrane (PVM) into the host erythrocyte [PMID:19536257, PMID:25043010]. Together with PTEX150 and the membrane channel EXP2 it forms a stable, high-molecular-weight complex assembled at the PVM after invasion, having been delivered from merozoite dense granules during schizogony [PMID:19536257, PMID:22253438]. Cryo-EM of the endogenous complex shows HSP101 as a spiral AAA+ hexamer poised above the EXP2–PTEX150 funnel, whose tyrosine-bearing pore loops grip cargo and, through a compaction/'resetting' conformational cycle, thread substrate through the channel [PMID:30150771]. Conditional inactivation of HSP101 blocks export of all classes of exported cargo — PEXEL proteins, PEXEL-negative exported proteins, and the virulence factor PfEMP1 — causing substrate accumulation in the vacuole and severe growth impairment, and it is required for the protein-conducting but not the nutrient-channel activity of EXP2 [PMID:25043010, PMID:25043043, PMID:30150733]. Uncoupling mutants establish that HSP101 provides the unfoldase activity specifically needed to translocate tightly folded soluble cargo, whereas transmembrane-domain cargo accesses an alternative unfolding route [PMID:31164473]. Beyond the vacuole, HSP101 also localizes to the parasite ER, where it recognizes and escorts PEXEL proteins toward the PVM for docking onto the EXP2–PTEX150 subcomplex [PMID:35192672], and is maintained in the vacuole in functional excess relative to the minimum required to sustain export [PMID:37552754]. Attempted deletion in P. berghei failed, indicating HSP101 is essential for blood-stage development [PMID:23869529, PMID:24076174].","teleology":[{"year":2009,"claim":"Establishing that a dedicated machine exports parasite proteins into the host cell required identifying its components; HSP101 was defined as the AAA+ ATPase of the PVM-resident PTEX complex.","evidence":"Co-IP, mass spectrometry, immuno-EM localizing HSP101 with PTEX150 and EXP2 in P. falciparum","pmids":["19536257"],"confidence":"High","gaps":["Did not demonstrate ATP-driven translocation directly","Stoichiometry and architecture of the complex unresolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2012,"claim":"How and when the translocon reaches the PVM was unknown; HSP101 was shown to be pre-packaged in merozoite dense granules and discharged into the nascent PVM to assemble a stable >1230 kDa complex.","evidence":"Immunofluorescence, subcellular fractionation, blue native PAGE, immuno-EM in P. falciparum","pmids":["22253438"],"confidence":"High","gaps":["Trigger and mechanism of dense-granule discharge not defined","Assembly order at the PVM inferred, not directly observed"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2013,"claim":"Whether HSP101 is dispensable was tested genetically; failure to delete it in P. berghei established essentiality for blood-stage development.","evidence":"Attempted reverse-genetic gene deletion in P. berghei","pmids":["23869529","24076174"],"confidence":"Medium","gaps":["Negative deletion result does not identify the essential function","No conditional confirmation in this species"],"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2014,"claim":"Whether HSP101 is functionally required for export, not merely present, was resolved by conditional inactivation, which blocked export of all cargo classes and showed complex integrity is needed.","evidence":"Chaperone auto-inhibition/dominant-negative and inducible knockdown with export assays, IF, Co-IP, and growth assays in P. falciparum","pmids":["25043010","25043043"],"confidence":"High","gaps":["Did not separate ATPase/unfoldase from complex-scaffolding roles","Mechanism of cargo recognition not addressed"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2014,"claim":"A candidate ER-based processing step for HSP101 was proposed by identifying it as a substrate of P. falciparum signal peptide peptidase.","evidence":"Transfection-based in vivo luminescence assay and bioinformatic substrate screen in P. falciparum","pmids":["25017910"],"confidence":"Low","gaps":["Single lab, single method with no mechanistic follow-up","Physiological consequence of cleavage for PTEX function not shown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2015,"claim":"Life-cycle localization of HSP101 was examined, revealing PV tubular extensions in blood stages and stage-specific expression, while its absence in early liver stages was linked to the lack of PEXEL translocation there.","evidence":"Endogenous fluorescent tagging, live imaging, CLEM, IF and reporter export assays in P. berghei","pmids":["26219962","26347246"],"confidence":"Medium","gaps":["Function of PV tubular extensions unresolved","Causality between HSP101 absence and liver-stage export block not proven"],"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2018,"claim":"The molecular mechanism of translocation was resolved by cryo-EM, showing HSP101 as a spiral hexamer whose tyrosine pore loops thread cargo through the EXP2–PTEX150 channel via an engaged/resetting cycle.","evidence":"Near-atomic cryo-EM of endogenous complex captured in engaged and resetting states, with CRISPR-Cas9 epitope tagging, in P. falciparum","pmids":["30150771"],"confidence":"High","gaps":["ATP hydrolysis coupling to the conformational cycle inferred from static states","Cargo entry/recognition at the hexamer not resolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2018,"claim":"Whether HSP101 governs EXP2's transport versus channel functions was separated; HSP101 is required for the protein-conducting activity but not the independent nutrient channel of EXP2.","evidence":"Regulated expression, export assays, and cell-attached patch-clamp in P. falciparum","pmids":["30150733"],"confidence":"High","gaps":["How EXP2 switches between roles not defined"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2018,"claim":"Spatial organization of the translocon under stalled export was probed, showing HSP101/PTEX150 remain in export zones while trapped cargo and EXP2 can be segregated, and that PTEX88 associates most closely with HSP101.","evidence":"Inducible folding reporters and IF (Traffic); IP and quantitative MS interactome (FEBS J) in P. falciparum","pmids":["29696751","29637707"],"confidence":"Medium","gaps":["Functional role of PTEX88–HSP101 interaction unclear","Meaning of EXP2/cargo segregation for normal export uncertain"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2019,"claim":"Whether HSP101's unfoldase activity is universally required was resolved by uncoupling mutants, showing it is essential for tightly folded soluble cargo but that transmembrane cargo uses an alternative unfolding pathway.","evidence":"Transgenic parasites with uncoupled unfoldase/threading functions and reporter export assays in P. falciparum","pmids":["31164473"],"confidence":"High","gaps":["Nature of the alternative unfolding pathway for TM cargo unidentified","Single lab"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2020,"claim":"The dependency of HSP101 organization on other PVM proteins was tested; EXP1 organizes EXP2 but not HSP101, indicating separable determinants of translocon architecture.","evidence":"Conditional knockdown (TetR-DOZI), IF, EM, and BioID in P. falciparum","pmids":["31990132"],"confidence":"Medium","gaps":["Determinants that position HSP101 in the PVM remain unknown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2021,"claim":"Whether restoring HSP101 alone could enable liver-stage export was tested; reconstituted HSP101 was insufficient, implicating additional missing components or an alternative export complex in liver stages.","evidence":"Promoter-swap/extra-copy transgenic P. berghei with PEXEL reporter export assays","pmids":["34956312"],"confidence":"Medium","gaps":["Identity of missing liver-stage factors unknown","Whether an alternative complex exists not established"],"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2022,"claim":"An upstream chaperone role was defined: HSP101 also resides in the ER and binds PEXEL proteins irrespective of processing, escorting them to the PVM where an EXP2–PTEX150 subcomplex facilitates HSP101 docking.","evidence":"IF localization, Co-IP with model PEXEL proteins, transgenic lines in P. falciparum","pmids":["35192672"],"confidence":"Medium","gaps":["Structural basis of ER PEXEL recognition unknown","How ER and vacuolar HSP101 pools relate not resolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2022,"claim":"A possible additional PTEX function in nutrient acquisition was explored; transient HSP101 knockdown reduced hemoglobin uptake.","evidence":"Conditional knockdown (DDDHA) and hemoglobin uptake assays in P. falciparum","pmids":["36238365"],"confidence":"Low","gaps":["Single knockdown with indirect readout and no mechanistic follow-up","Direct role of HSP101 versus secondary effects not distinguished"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2023,"claim":"Vacuolar HSP101 abundance relative to demand was quantified; HSP101 is present in the vacuole in functional excess over the minimum required for export.","evidence":"DiCre-mediated ER sequestration (knockER) with comparison to translational knockdown and export assays in P. falciparum","pmids":["37552754"],"confidence":"Medium","gaps":["Biological purpose of the functional excess unclear","Single lab, novel tool"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2023,"claim":"Cargo features required to engage HSP101 were mapped; the spacer between the PEXEL motif and the folded domain must be adequate in length/composition, and the P2' PEXEL residue has a dual role in plasmepsin V cleavage and HSP101-dependent export.","evidence":"Transgenic reporter export assays with PEXEL mutants and conditional knockdown in P. falciparum","pmids":["37926971"],"confidence":"Medium","gaps":["Direct binding of the spacer to HSP101 pore loops not shown","Generalizability across native cargo untested"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":null,"claim":"How ATP hydrolysis is kinetically coupled to the threading cycle, how HSP101 selects and hands off cargo from ER to PVM, and the identity of the alternative unfolding route for transmembrane cargo remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No time-resolved biochemical measurement of ATP-coupled translocation","Unidentified TM-cargo unfolding pathway","Mechanistic basis of vacuolar functional excess unknown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":["PTEX (Plasmodium translocon of exported proteins) core complex: HSP101 + PTEX150 + EXP2","HSP101 spiral AAA+ hexamer tethered above the EXP2-PTEX150 funnel",">1230 kDa macromolecular PTEX assembly at the PVM"],"partners":["PTEX150","EXP2","PTEX88 (CLOSEST INTERACTION PARTNER WITHIN PTEX)","PEXEL-MOTIF EXPORTED PROTEINS (CARGO, RECOGNIZED IN THE ER)"],"other_free_text":["Delivered to the PVM from merozoite dense granules after invasion [#1].","Essential for blood-stage development; deletion in P. berghei not achievable [#2].","Required for protein-conducting function of EXP2 but not its nutrient channel activity [#9].","Unfoldase specifically required for tightly folded soluble cargo; transmembrane cargo uses an alternative unfolding pathway [#12].","Present in the vacuole in functional excess over the minimum needed for export [#17].","Cargo engagement requires a sufficient spacer downstream of the PEXEL motif and the P2' E/Q/D residue [#18].","Absent in early liver stages; reconstitution of HSP101 alone insufficient to restore liver-stage PEXEL export [#7, #14].","Proposed substrate of P. falciparum signal peptide peptidase (Low confidence) [#5].","Transient knockdown reduced hemoglobin uptake (Low confidence) [#16]."]}},"prefetch_data":{},"corpus_meta":[{"pmid":"19536257","id":"PMC_19536257","title":"A newly discovered protein export machine in malaria parasites.","date":"2009","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/19536257","citation_count":381,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["HSP101","heat shock protein 101"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"25043043","id":"PMC_25043043","title":"PTEX is an essential nexus for protein export in malaria parasites.","date":"2014","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/25043043","citation_count":207,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["HSP101"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"25043010","id":"PMC_25043010","title":"PTEX component HSP101 mediates export of diverse malaria effectors into host erythrocytes.","date":"2014","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/25043010","citation_count":205,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["HSP101","heat shock protein 101"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"30150771","id":"PMC_30150771","title":"Malaria parasite translocon structure and mechanism of effector export.","date":"2018","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/30150771","citation_count":159,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["HSP101"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"27374802","id":"PMC_27374802","title":"Plasmodium species: master renovators of their host cells.","date":"2016","source":"Nature reviews. 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Implications for gametocytogenesis.","date":"2014","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/25017910","citation_count":8,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["HSP101","heat shock protein 101"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"34956312","id":"PMC_34956312","title":"Absence of PEXEL-Dependent Protein Export in Plasmodium Liver Stages Cannot Be Restored by Gain of the HSP101 Protein Translocon ATPase.","date":"2021","source":"Frontiers in genetics","url":"https://pubmed.ncbi.nlm.nih.gov/34956312","citation_count":6,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["HSP101"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"37926971","id":"PMC_37926971","title":"Sequence elements within the PEXEL motif and its downstream region modulate PTEX-dependent protein export in Plasmodium falciparum.","date":"2023","source":"Traffic (Copenhagen, Denmark)","url":"https://pubmed.ncbi.nlm.nih.gov/37926971","citation_count":6,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["HSP101"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":17807,"output_tokens":5007,"usd":0.064263,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":11646,"output_tokens":5757,"usd":0.101078,"stage2_stop_reason":"end_turn"},"total_usd":0.165341,"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\": 2009,\n      \"finding\": \"HSP101 (PF3D7_1116800) was identified as a component of the Plasmodium translocon of exported proteins (PTEX) located in the parasitophorous vacuole membrane of P. falciparum. HSP101 is a ClpA/B-like AAA+ ATPase that forms part of an ATP-powered complex together with PTEX150 and EXP2, implicated in protein export across the vacuolar membrane.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, immunofluorescence, immunoelectron microscopy\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP and MS identification of complex components, replicated in multiple subsequent studies\",\n      \"pmids\": [\"19536257\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"HSP101 is synthesized during the schizont stage and, prior to invasion, resides within the dense granules of invasive merozoites. After invasion, HSP101 is released into the parasitophorous vacuole membrane where it assembles as part of a stable macromolecular complex of >1230 kDa, with little turnover for most of the erythrocytic cycle. Biochemical fractionation supports an EXP2–PTEX150–HSP101 arrangement within the complex.\",\n      \"method\": \"Immunofluorescence, subcellular fractionation, blue native PAGE, immunoelectron microscopy\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal localization and biochemical methods, consistent with independent studies\",\n      \"pmids\": [\"22253438\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Repeated attempts to delete HSP101 in P. berghei failed, indicating that HSP101 is essential for blood-stage parasite development. This genetic essentiality is consistent with an obligatory role in protein export.\",\n      \"method\": \"Reverse genetics (attempted gene deletion in P. berghei)\",\n      \"journal\": \"Molecular microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — negative result from targeted gene deletion attempts, consistent across multiple attempts and corroborated by P. berghei study (PMID:24076174)\",\n      \"pmids\": [\"23869529\", \"24076174\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Conditional knockdown of HSP101 in P. falciparum caused a nearly complete block in export of all classes of exported proteins (PEXEL and PEXEL-negative), with substrates accumulating in the vacuole in both asexual and sexual parasites. Under export-blocked conditions, association between HSP101 and other PTEX components was lost, indicating complex integrity is required for efficient export.\",\n      \"method\": \"Chaperone auto-inhibition (dominant-negative strategy), immunofluorescence, protein export assays, co-immunoprecipitation\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — rapid reversible functional ablation with multiple orthogonal readouts, confirmed by parallel study (PMID:25043043)\",\n      \"pmids\": [\"25043010\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Conditional knockdown of HSP101 (or PTEX150) greatly reduced trafficking of all classes of exported proteins across the double-membrane barrier in P. falciparum, including PEXEL proteins, PNEPs, and the virulence factor PfEMP1. Even modest knockdown strongly impaired blood-stage growth in vitro and in vivo.\",\n      \"method\": \"Inducible knockdown (conditional mutagenesis), flow cytometry, immunofluorescence, in vitro and in vivo growth assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional knockdown with multiple orthogonal export readouts, confirmed by parallel study (PMID:25043010)\",\n      \"pmids\": [\"25043043\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"HSP101 (PF3D7_1116800) was identified as a substrate of P. falciparum signal peptide peptidase (PfSPP) using a transfection-based in vivo luminescence assay, establishing intramembrane proteolytic cleavage of HSP101 by PfSPP at the endoplasmic reticulum.\",\n      \"method\": \"Transfection-based in vivo luminescence assay, bioinformatics substrate screen\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single method, limited mechanistic follow-up\",\n      \"pmids\": [\"25017910\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Live cell imaging of endogenously fluorescence-tagged HSP101 in P. berghei revealed that HSP101 localizes to motile tubular extensions of the parasitophorous vacuole that protrude from the parasite into the red blood cell, most prominently during trophozoite growth. Distinct spatiotemporal expression during sporogony and liver-stage development indicates additional functions across the life cycle.\",\n      \"method\": \"Live cell fluorescence microscopy, correlative light and electron microscopy (CLEM), endogenous fluorescent tagging\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live imaging with endogenous tagging, single lab, two orthogonal microscopy methods\",\n      \"pmids\": [\"26219962\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"HSP101 could not be detected during early liver stages of P. berghei infection, suggesting that the absence of HSP101 (the putative molecular motor of PTEX) may explain the lack of direct protein translocation of PEXEL-bearing reporters into the hepatocyte cytosol during liver-stage infection.\",\n      \"method\": \"Immunofluorescence, transgenic reporter export assays in liver stage\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct immunofluorescence detection, consistent with genetic rescue data from PMID:34956312\",\n      \"pmids\": [\"26347246\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Cryo-electron microscopy of the endogenous PTEX core complex from P. falciparum at near-atomic resolution revealed that HSP101 forms a spiral-shaped AAA+ hexamer tethered above the EXP2-PTEX150 funnel-shaped channel. In the 'resetting' state, HSP101 undergoes pronounced compaction allowing three of six tyrosine-bearing pore loops lining the HSP101 channel to dissociate from cargo, resetting the translocon for the next threading cycle. Structures were captured in 'engaged' and 'resetting' states of cargo translocation using CRISPR-Cas9-inserted epitope tags.\",\n      \"method\": \"Cryo-electron microscopy (near-atomic resolution), CRISPR-Cas9 epitope tagging, endogenous complex isolation\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — near-atomic cryo-EM structure of endogenous complex with multiple conformational states, rigorous structural and functional validation\",\n      \"pmids\": [\"30150771\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Inactivation of HSP101 (the AAA+ ATPase component of PTEX) arrests protein export across the parasitophorous vacuolar membrane, establishing HSP101 as required for the protein-conducting function of EXP2 but not for EXP2's independent nutrient channel activity.\",\n      \"method\": \"Regulated gene expression, functional protein export assays, cell-attached patch-clamp\",\n      \"journal\": \"Nature microbiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — orthogonal methods (conditional knockdown + electrophysiology), consistent with prior studies\",\n      \"pmids\": [\"30150733\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"When export cargo is blocked from unfolding, loop-like extensions appear at the parasitophorous vacuole membrane containing trapped cargo and EXP2 but not HSP101 or PTEX150, indicating that HSP101 and PTEX150 remain in the main PTEX-containing export zones while EXP2 can be spatially segregated with stalled cargo.\",\n      \"method\": \"Fluorescence microscopy with inducible folding reporters (mouse DHFR domains), immunofluorescence\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — inducible reporter system with microscopic readout, single lab\",\n      \"pmids\": [\"29696751\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Proteomic analysis showed that PTEX88 interacts most closely with HSP101 within the PTEX complex, with weaker affinity for other core PTEX constituents (EXP2, PTEX150), establishing HSP101 as the primary interaction partner of PTEX88 within the translocon.\",\n      \"method\": \"Immunoprecipitation, quantitative mass spectrometry (interactome/proteomics)\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MS-based interactome from IP, single lab\",\n      \"pmids\": [\"29637707\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Transgenic P. falciparum parasites were generated in which the unfoldase and threading/translocation functions of HSP101 were uncoupled. These parasites could export native proteins but were unable to translocate tightly folded soluble PEXEL-bearing reporter proteins across the PVM. In contrast, an identical reporter with a transmembrane domain could be exported, demonstrating that (1) HSP101 serves as the unfoldase for soluble cargo requiring translocation, and (2) proteins with transmembrane domains use an alternative unfolding pathway prior to PTEX.\",\n      \"method\": \"Transgenic parasite generation (uncoupled unfoldase mutants), reporter export assays, immunofluorescence\",\n      \"journal\": \"mBio\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct mutagenesis uncoupling two activities with multiple reporter substrates, single lab but rigorous\",\n      \"pmids\": [\"31164473\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Although EXP1 knockdown caused profound vacuole ultrastructure defects and altered EXP2 distribution in the PVM, the distribution of the HSP101 unfoldase was not substantially altered, indicating that EXP1 is specifically required for organizing EXP2 but not HSP101 within the vacuole membrane.\",\n      \"method\": \"Conditional knockdown (TetR-DOZI-aptamers), immunofluorescence, electron microscopy, BioID proximity labeling\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional knockdown with multiple imaging readouts, single lab\",\n      \"pmids\": [\"31990132\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Transgenic P. berghei parasites restored with liver-stage HSP101 expression (via ptex150 or ef1α promoter) completed the life cycle but failed to export PEXEL-proteins in early liver stages, demonstrating that HSP101 alone is insufficient to reconstitute PTEX-dependent export in early liver stages, implicating additional missing PTEX components or alternative liver-stage export complexes.\",\n      \"method\": \"Transgenic parasite generation (promoter swap, additional gene copy), PEXEL reporter export assays in liver stage\",\n      \"journal\": \"Frontiers in genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic rescue experiment with reporter readout, single lab\",\n      \"pmids\": [\"34956312\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"HSP101 localizes both within the parasitophorous vacuole and within the parasite's ER throughout ring and trophozoite stages. HSP101 forms specific interactions with model PEXEL proteins in the ER irrespective of their PEXEL processing status, suggesting that HSP101 functions as a chaperone that recognizes and escorts PEXEL proteins from the ER to the parasitophorous vacuole. Additionally, EXP2 and PTEX150 form a stable subcomplex that facilitates HSP101 docking at the PVM.\",\n      \"method\": \"Immunofluorescence (localization), co-immunoprecipitation (protein interactions), transgenic parasite lines\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and immunofluorescence with multiple constructs, single lab, two orthogonal methods\",\n      \"pmids\": [\"35192672\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Transient knockdown of HSP101 (in HSP101-DDDHA parasites) decreased hemoglobin uptake inside P. falciparum parasites, suggesting a role for the HSP101-containing PTEX complex at the parasitophorous vacuole membrane in hemoglobin uptake.\",\n      \"method\": \"Conditional knockdown (DDDHA destabilization domain), hemoglobin uptake assays\",\n      \"journal\": \"FASEB bioAdvances\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single knockdown experiment, single lab, indirect readout, limited mechanistic follow-up\",\n      \"pmids\": [\"36238365\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Using the knockER system (DiCre-mediated ER sequestration via inducible KDEL fusion), vacuolar levels of HSP101 were shown to be maintained in excess of what is required to sustain effector protein export into the erythrocyte. Vacuole depletion of HSP101 hypersensitized parasites to a destabilization tag that inhibits HSP101-PTEX complex formation, but not to translational knockdown of the entire HSP101 pool, demonstrating compartment-specific functional excess of HSP101.\",\n      \"method\": \"DiCre-mediated knock-sideways (knockER), conditional ER retrieval, protein export 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 — novel genetic tool with orthogonal knockdown comparison, single lab\",\n      \"pmids\": [\"37552754\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"The downstream 'spacer' region separating the PEXEL motif from the folded functional domain of an exported protein must be of sufficient length and permissive amino acid composition to engage the HSP101 unfoldase component of PTEX for efficient translocation into the red blood cell. The conserved P2' E/Q/D residue of the PEXEL motif also has a dual role: first for plasmepsin V cleavage in the ER, and second for efficient PTEX-mediated (HSP101-dependent) export across the PVM.\",\n      \"method\": \"Transgenic reporter export assays, PEXEL mutant analysis, conditional knockdown\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple reporter constructs with defined mutations, single lab\",\n      \"pmids\": [\"37926971\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"current_model\": \"HSP101 (PF3D7_1116800) is a ClpB-like AAA+ ATPase and essential core component of the Plasmodium translocon of exported proteins (PTEX) at the parasitophorous vacuole membrane; it forms a spiral hexamer that uses tyrosine-bearing pore loops to thread and unfold cargo proteins for translocation across the vacuolar membrane, is delivered to the PVM from merozoite dense granules, chaperones PEXEL-motif proteins from the ER to the vacuole for PTEX docking, and is present in excess in the vacuole relative to the minimum required for export, with its unfoldase activity specifically required for soluble tightly-folded substrates but dispensable for transmembrane-domain-containing cargo that accesses an alternative unfolding pathway.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"HSP101 (PF3D7_1116800) is a ClpA/B-like AAA+ ATPase that serves as the essential motor subunit of the Plasmodium translocon of exported proteins (PTEX), the machine that drives export of parasite effector proteins across the parasitophorous vacuole membrane (PVM) into the host erythrocyte [#0, #3]. Together with PTEX150 and the membrane channel EXP2 it forms a stable, high-molecular-weight complex assembled at the PVM after invasion, having been delivered from merozoite dense granules during schizogony [#0, #1]. Cryo-EM of the endogenous complex shows HSP101 as a spiral AAA+ hexamer poised above the EXP2–PTEX150 funnel, whose tyrosine-bearing pore loops grip cargo and, through a compaction/'resetting' conformational cycle, thread substrate through the channel [#8]. Conditional inactivation of HSP101 blocks export of all classes of exported cargo — PEXEL proteins, PEXEL-negative exported proteins, and the virulence factor PfEMP1 — causing substrate accumulation in the vacuole and severe growth impairment, and it is required for the protein-conducting but not the nutrient-channel activity of EXP2 [#3, #4, #9]. Uncoupling mutants establish that HSP101 provides the unfoldase activity specifically needed to translocate tightly folded soluble cargo, whereas transmembrane-domain cargo accesses an alternative unfolding route [#12]. Beyond the vacuole, HSP101 also localizes to the parasite ER, where it recognizes and escorts PEXEL proteins toward the PVM for docking onto the EXP2–PTEX150 subcomplex [#15], and is maintained in the vacuole in functional excess relative to the minimum required to sustain export [#17]. Attempted deletion in P. berghei failed, indicating HSP101 is essential for blood-stage development [#2].\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"Establishing that a dedicated machine exports parasite proteins into the host cell required identifying its components; HSP101 was defined as the AAA+ ATPase of the PVM-resident PTEX complex.\",\n      \"evidence\": \"Co-IP, mass spectrometry, immuno-EM localizing HSP101 with PTEX150 and EXP2 in P. falciparum\",\n      \"pmids\": [\"19536257\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not demonstrate ATP-driven translocation directly\", \"Stoichiometry and architecture of the complex unresolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"How and when the translocon reaches the PVM was unknown; HSP101 was shown to be pre-packaged in merozoite dense granules and discharged into the nascent PVM to assemble a stable >1230 kDa complex.\",\n      \"evidence\": \"Immunofluorescence, subcellular fractionation, blue native PAGE, immuno-EM in P. falciparum\",\n      \"pmids\": [\"22253438\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trigger and mechanism of dense-granule discharge not defined\", \"Assembly order at the PVM inferred, not directly observed\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Whether HSP101 is dispensable was tested genetically; failure to delete it in P. berghei established essentiality for blood-stage development.\",\n      \"evidence\": \"Attempted reverse-genetic gene deletion in P. berghei\",\n      \"pmids\": [\"23869529\", \"24076174\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Negative deletion result does not identify the essential function\", \"No conditional confirmation in this species\"],\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Whether HSP101 is functionally required for export, not merely present, was resolved by conditional inactivation, which blocked export of all cargo classes and showed complex integrity is needed.\",\n      \"evidence\": \"Chaperone auto-inhibition/dominant-negative and inducible knockdown with export assays, IF, Co-IP, and growth assays in P. falciparum\",\n      \"pmids\": [\"25043010\", \"25043043\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not separate ATPase/unfoldase from complex-scaffolding roles\", \"Mechanism of cargo recognition not addressed\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"A candidate ER-based processing step for HSP101 was proposed by identifying it as a substrate of P. falciparum signal peptide peptidase.\",\n      \"evidence\": \"Transfection-based in vivo luminescence assay and bioinformatic substrate screen in P. falciparum\",\n      \"pmids\": [\"25017910\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single lab, single method with no mechanistic follow-up\", \"Physiological consequence of cleavage for PTEX function not shown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Life-cycle localization of HSP101 was examined, revealing PV tubular extensions in blood stages and stage-specific expression, while its absence in early liver stages was linked to the lack of PEXEL translocation there.\",\n      \"evidence\": \"Endogenous fluorescent tagging, live imaging, CLEM, IF and reporter export assays in P. berghei\",\n      \"pmids\": [\"26219962\", \"26347246\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Function of PV tubular extensions unresolved\", \"Causality between HSP101 absence and liver-stage export block not proven\"],\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"The molecular mechanism of translocation was resolved by cryo-EM, showing HSP101 as a spiral hexamer whose tyrosine pore loops thread cargo through the EXP2–PTEX150 channel via an engaged/resetting cycle.\",\n      \"evidence\": \"Near-atomic cryo-EM of endogenous complex captured in engaged and resetting states, with CRISPR-Cas9 epitope tagging, in P. falciparum\",\n      \"pmids\": [\"30150771\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"ATP hydrolysis coupling to the conformational cycle inferred from static states\", \"Cargo entry/recognition at the hexamer not resolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Whether HSP101 governs EXP2's transport versus channel functions was separated; HSP101 is required for the protein-conducting activity but not the independent nutrient channel of EXP2.\",\n      \"evidence\": \"Regulated expression, export assays, and cell-attached patch-clamp in P. falciparum\",\n      \"pmids\": [\"30150733\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How EXP2 switches between roles not defined\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Spatial organization of the translocon under stalled export was probed, showing HSP101/PTEX150 remain in export zones while trapped cargo and EXP2 can be segregated, and that PTEX88 associates most closely with HSP101.\",\n      \"evidence\": \"Inducible folding reporters and IF (Traffic); IP and quantitative MS interactome (FEBS J) in P. falciparum\",\n      \"pmids\": [\"29696751\", \"29637707\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional role of PTEX88–HSP101 interaction unclear\", \"Meaning of EXP2/cargo segregation for normal export uncertain\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Whether HSP101's unfoldase activity is universally required was resolved by uncoupling mutants, showing it is essential for tightly folded soluble cargo but that transmembrane cargo uses an alternative unfolding pathway.\",\n      \"evidence\": \"Transgenic parasites with uncoupled unfoldase/threading functions and reporter export assays in P. falciparum\",\n      \"pmids\": [\"31164473\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Nature of the alternative unfolding pathway for TM cargo unidentified\", \"Single lab\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"The dependency of HSP101 organization on other PVM proteins was tested; EXP1 organizes EXP2 but not HSP101, indicating separable determinants of translocon architecture.\",\n      \"evidence\": \"Conditional knockdown (TetR-DOZI), IF, EM, and BioID in P. falciparum\",\n      \"pmids\": [\"31990132\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Determinants that position HSP101 in the PVM remain unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Whether restoring HSP101 alone could enable liver-stage export was tested; reconstituted HSP101 was insufficient, implicating additional missing components or an alternative export complex in liver stages.\",\n      \"evidence\": \"Promoter-swap/extra-copy transgenic P. berghei with PEXEL reporter export assays\",\n      \"pmids\": [\"34956312\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of missing liver-stage factors unknown\", \"Whether an alternative complex exists not established\"],\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"An upstream chaperone role was defined: HSP101 also resides in the ER and binds PEXEL proteins irrespective of processing, escorting them to the PVM where an EXP2–PTEX150 subcomplex facilitates HSP101 docking.\",\n      \"evidence\": \"IF localization, Co-IP with model PEXEL proteins, transgenic lines in P. falciparum\",\n      \"pmids\": [\"35192672\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of ER PEXEL recognition unknown\", \"How ER and vacuolar HSP101 pools relate not resolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"A possible additional PTEX function in nutrient acquisition was explored; transient HSP101 knockdown reduced hemoglobin uptake.\",\n      \"evidence\": \"Conditional knockdown (DDDHA) and hemoglobin uptake assays in P. falciparum\",\n      \"pmids\": [\"36238365\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single knockdown with indirect readout and no mechanistic follow-up\", \"Direct role of HSP101 versus secondary effects not distinguished\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Vacuolar HSP101 abundance relative to demand was quantified; HSP101 is present in the vacuole in functional excess over the minimum required for export.\",\n      \"evidence\": \"DiCre-mediated ER sequestration (knockER) with comparison to translational knockdown and export assays in P. falciparum\",\n      \"pmids\": [\"37552754\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Biological purpose of the functional excess unclear\", \"Single lab, novel tool\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Cargo features required to engage HSP101 were mapped; the spacer between the PEXEL motif and the folded domain must be adequate in length/composition, and the P2' PEXEL residue has a dual role in plasmepsin V cleavage and HSP101-dependent export.\",\n      \"evidence\": \"Transgenic reporter export assays with PEXEL mutants and conditional knockdown in P. falciparum\",\n      \"pmids\": [\"37926971\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct binding of the spacer to HSP101 pore loops not shown\", \"Generalizability across native cargo untested\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How ATP hydrolysis is kinetically coupled to the threading cycle, how HSP101 selects and hands off cargo from ER to PVM, and the identity of the alternative unfolding route for transmembrane cargo remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No time-resolved biochemical measurement of ATP-coupled translocation\", \"Unidentified TM-cargo unfolding pathway\", \"Mechanistic basis of vacuolar functional excess unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016887\", \"supporting_discovery_ids\": [0, 8]},\n      {\"term_id\": \"GO:0140662\", \"supporting_discovery_ids\": [8, 12]},\n      {\"term_id\": \"GO:0051082\", \"supporting_discovery_ids\": [12, 15]},\n      {\"term_id\": \"GO:0015450\", \"supporting_discovery_ids\": [3, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0020005\", \"supporting_discovery_ids\": [0, 1, 6]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [15]},\n      {\"term_id\": \"GO:0005788\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0046898\", \"supporting_discovery_ids\": [0, 3, 4]},\n      {\"term_id\": \"GO:0065002\", \"supporting_discovery_ids\": [3, 9, 12]}\n    ],\n    \"complexes\": [\n      \"PTEX (Plasmodium translocon of exported proteins) core complex: HSP101 + PTEX150 + EXP2\",\n      \"HSP101 spiral AAA+ hexamer tethered above the EXP2-PTEX150 funnel\",\n      \">1230 kDa macromolecular PTEX assembly at the PVM\"\n    ],\n    \"partners\": [\n      \"PTEX150\",\n      \"EXP2\",\n      \"PTEX88 (closest interaction partner within PTEX)\",\n      \"PEXEL-motif exported proteins (cargo, recognized in the ER)\"\n    ],\n    \"other_free_text\": [\n      \"Delivered to the PVM from merozoite dense granules after invasion [#1].\",\n      \"Essential for blood-stage development; deletion in P. berghei not achievable [#2].\",\n      \"Required for protein-conducting function of EXP2 but not its nutrient channel activity [#9].\",\n      \"Unfoldase specifically required for tightly folded soluble cargo; transmembrane cargo uses an alternative unfolding pathway [#12].\",\n      \"Present in the vacuole in functional excess over the minimum needed for export [#17].\",\n      \"Cargo engagement requires a sufficient spacer downstream of the PEXEL motif and the P2' E/Q/D residue [#18].\",\n      \"Absent in early liver stages; reconstitution of HSP101 alone insufficient to restore liver-stage PEXEL export [#7, #14].\",\n      \"Proposed substrate of P. falciparum signal peptide peptidase (Low confidence) [#5].\",\n      \"Transient knockdown reduced hemoglobin uptake (Low confidence) [#16].\"\n    ]\n  }\n}","audit_flag":null,"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_1116800","name":null,"product":"heat shock protein 101","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PbANKA","gene_id":"PBANKA_0931200","name":null,"product":"heat shock protein 101","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_0914500","name":null,"product":"heat shock protein 101, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"HSP101","evaluation":null}