{"gene":"PF3D7_0917900","run_date":"2026-09-08T12:51:27","timeline":{"discoveries":[{"year":1988,"finding":"PF3D7_0917900 (BIP/PfGRP78) was identified as a P. falciparum gene encoding a protein similar to the mammalian 78-kDa glucose-regulated protein (GRP78). The gene is expressed during asexual and sexual erythrocytic stages (RNA blot analysis), and a 72-kDa protein is immunoprecipitated from erythrocytic-stage parasites. The deduced protein sequence contains only three of the four canonical C-terminal ER-retention amino acids (Asp-Glu-Leu), suggesting possible ER localization.","method":"Genomic DNA cloning, RNA blot analysis, immunoprecipitation, sequence homology analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — immunoprecipitation plus RNA blot and sequence analysis in single study, single lab","pmids":["3045815"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1991,"finding":"PF3D7_0917900 (BIP/Pfgrp) localization was determined by immuno-gold electron microscopy to be primarily cytoplasmic, consistent with endoplasmic reticulum localization. Its synthesis was not induced by heat shock (unlike the cytosolic PfHsp70), nor by glucose deprivation, calcium ionophore A23187, tunicamycin, or 2-deoxyglucose, distinguishing its stress-response profile from canonical GRP78 inducers in mammalian cells. The C-terminal SDEL sequence was proposed to function similarly to KDEL in mammalian ER retention.","method":"Immuno-gold electron microscopy, metabolic labeling, Northern blot analysis, in vitro translation","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct subcellular localization by immuno-gold EM combined with multiple biochemical induction assays, single lab","pmids":["1779989"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1993,"finding":"PF3D7_0917900 (BIP) was used as a validated ER marker in P. falciparum. Upon treatment with brefeldin A (BFA), the localization of PfERD2 (normally in a single perinuclear Golgi focus) redistributed to a diffuse pattern similar to that of parasite BIP (ER marker), establishing that BIP resides in the parasite ER and that its localization is distinct from the cis-Golgi compartment.","method":"Indirect immunofluorescence, brefeldin A treatment, subcellular fractionation","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct immunofluorescence localization with pharmacological perturbation (BFA), single lab, single study","pmids":["8223485"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1993,"finding":"PF3D7_0917900 (BIP/PfGRP78) expression was markedly induced in the hepatic (exoerythrocytic) stages of P. berghei (cultured in HepG2-A16 cells) and P. falciparum (in human hepatocytes in SCID mice), whereas expression was undetectable in sporozoites, establishing stage-specific upregulation of BIP during liver-stage development.","method":"Western blot, immunofluorescence of cultured exoerythrocytic stages","journal":"Parasitology research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single study, Western blot and immunofluorescence only, no functional follow-up specific to BIP","pmids":["8475027"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":""},{"species":"Plasmodium falciparum","strain":""}]},{"year":2003,"finding":"PF3D7_0917900 (BIP) partially co-localizes with COPII coat proteins (Sar1p and Sec31p) and the 68 kDa and 22 kDa proteins of the Plasmodium export compartment (PEC), a brefeldin A-sensitive compartment proposed to be an early step in protein export from the parasite to the infected erythrocyte. This suggests the PEC is a domain of the ER or closely related to it.","method":"Co-localization immunofluorescence microscopy, brefeldin A treatment","journal":"Molecular and biochemical parasitology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single-lab co-localization study, partial overlap only, no functional assay specific to BIP","pmids":["12850257"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2018,"finding":"The crystal structure of the ATP-binding domain of P. falciparum GRP78 (PF3D7_0917900/BIP) was determined in complex with ADP. The structure revealed structural features unique to the parasite relative to human GRP78. Recombinant PfGRP78 was shown to be lethal to drug-sensitive and drug-resistant P. falciparum strains in vitro when inhibited by repurposed chaperone inhibitors (anticancer agents), and inhibitor binding to recombinant PfGRP78 was characterized biochemically, establishing BIP as a valid drug target.","method":"X-ray crystallography, recombinant protein binding characterization, in vitro parasite growth inhibition assay","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure determination with ADP, combined with in vitro functional inhibition and parasite growth assays, single lab but multiple orthogonal methods","pmids":["29985421"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2019,"finding":"PF3D7_0917900 (BIP) physically interacts with the ER chaperone PfGRP170 in P. falciparum, as demonstrated by co-immunoprecipitation. Loss of PfGRP170 function (conditional mutant) led to activation of the P. falciparum eIF2α kinase PK4, placing BIP within the parasite unfolded protein response/ER stress pathway. BIP localizes to the parasite ER.","method":"Co-immunoprecipitation, conditional mutagenesis (TetR-DOZI system), immunofluorescence","journal":"Cellular microbiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP establishing direct interaction, combined with conditional KO and functional pathway readout, single lab","pmids":["31087747"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2020,"finding":"PF3D7_0917900 (BIP/PfHSP70-2) was identified as the 68 kDa protein recognized by a monoclonal antibody against the Plasmodium export compartment (PEC), by affinity purification and peptide mapping mass spectrometry. This localizes BIP to the PEC, a domain of the ER, and suggests a role for BIP in the export of Plasmodium proteins to the host erythrocyte.","method":"Affinity purification, peptide mapping by mass spectrometry, immunofluorescence","journal":"Heliyon","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct protein identification by MS after affinity purification, single lab","pmids":["32529065"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2021,"finding":"PfGCN5 (a histone acetyltransferase) was shown by ChIP-seq to directly bind to the BIP (PF3D7_0917900) gene locus in artemisinin-exposed P. falciparum, and BIP expression was upregulated under stress/artemisinin treatment conditions. This places BIP transcriptional regulation under epigenetic control via PfGCN5, linking BIP to the artemisinin resistance response.","method":"ChIP-seq (chromatin immunoprecipitation followed by sequencing), qRT-PCR expression analysis","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq directly maps PfGCN5 binding at BIP locus; single lab but genomic-scale with gene-specific validation","pmids":["33441725"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2022,"finding":"A high-throughput crystal-based fragment screening approach identified eight nucleoside analogue 'hit' compounds binding at the active site of the ATP-binding domain of P. falciparum GRP78 (PF3D7_0917900/BIP), as determined by X-ray crystallography. Binding was further validated by protein thermal shift assays. This established druggable sites on the ATP-binding domain of BIP distinct from those exploitable in human GRP78.","method":"X-ray crystallography (ligand soaking screen of 233 compounds), protein thermal shift assay","journal":"Frontiers in molecular biosciences","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystallographic structures of BIP ATP-binding domain in complex with ligands, validated by orthogonal thermal shift assay, single lab","pmids":["36275624"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"current_model":"PF3D7_0917900 (BIP/PfGRP78) is an ER-resident HSP70-class molecular chaperone in P. falciparum whose localization to the parasite ER is established by immuno-gold EM and immunofluorescence; it physically interacts with the ER co-chaperone PfGRP170 and participates in the unfolded protein response (linking to eIF2α kinase PK4 activation); its ATP-binding domain has been structurally resolved by X-ray crystallography (with ADP and with fragment ligands), revealing parasite-specific features that can be exploited for selective inhibition; BIP expression is transcriptionally upregulated by the histone acetyltransferase PfGCN5 under artemisinin/stress conditions; and it partially localizes to the Plasmodium export compartment, suggesting a role in protein export to the host erythrocyte."},"narrative":{"mechanistic_narrative":"PF3D7_0917900 (BIP/PfGRP78) is an ER-resident HSP70-class molecular chaperone of Plasmodium falciparum, encoded by a gene expressed across asexual and sexual erythrocytic stages and homologous to mammalian GRP78 [PMID:3045815]. Its ER residence is established directly by immuno-gold electron microscopy and by immunofluorescence, where it serves as a validated parasite ER marker distinct from the cis-Golgi, consistent with its non-canonical C-terminal SDEL retention signal [PMID:1779989, PMID:8223485]. Unlike mammalian GRP78, BIP synthesis is not induced by heat shock, glucose deprivation, or classical ER-stress agents, defining a distinct stress-response profile [PMID:1779989]. Functionally, BIP operates within the parasite ER quality-control machinery: it physically interacts with the ER co-chaperone PfGRP170 by reciprocal co-immunoprecipitation, and loss of PfGRP170 activates the eIF2α kinase PK4, placing BIP within the parasite unfolded protein response [PMID:31087747]. BIP transcription is upregulated under artemisinin and stress conditions through direct binding of the histone acetyltransferase PfGCN5 at its locus, linking it to the artemisinin resistance response [PMID:33441725]. Beyond the canonical ER pool, BIP partially localizes to the brefeldin A-sensitive Plasmodium export compartment and was identified as its 68-kDa component by mass spectrometry, implicating it in early steps of protein export to the host erythrocyte [PMID:12850257, PMID:32529065]. The ATP-binding domain of BIP has been resolved crystallographically with ADP and with nucleoside-analogue fragment ligands, revealing parasite-specific active-site features exploitable for selective inhibition, and recombinant BIP is susceptible to chaperone inhibitors lethal to drug-sensitive and drug-resistant parasites, establishing it as a validated drug target [PMID:29985421, PMID:36275624].","teleology":[{"year":1988,"claim":"Establishing that P. falciparum encodes a GRP78-like chaperone answered whether the parasite possesses a dedicated ER HSP70 homolog, and its erythrocytic-stage expression defined when it is present.","evidence":"Genomic cloning, RNA blot, and immunoprecipitation of a 72-kDa protein with sequence homology analysis in P. falciparum","pmids":["3045815"],"confidence":"Medium","gaps":["Subcellular localization inferred only from partial ER-retention signal, not directly shown","No chaperone activity demonstrated","No binding partners identified"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1991,"claim":"Direct localization resolved where BIP resides and whether it behaves like mammalian GRP78, showing it is an ER protein with a distinct, non-inducible stress-response profile.","evidence":"Immuno-gold EM, metabolic labeling, and induction assays (heat, glucose deprivation, A23187, tunicamycin, 2-deoxyglucose) in P. falciparum","pmids":["1779989"],"confidence":"Medium","gaps":["SDEL retention mechanism proposed but not functionally tested","No molecular partners defined","Chaperone/folding function not assayed"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1993,"claim":"Using BIP as a reference marker confirmed its ER identity relative to the Golgi, resolving compartmental assignment within the parasite secretory pathway.","evidence":"Indirect immunofluorescence with brefeldin A perturbation and subcellular fractionation, comparing PfERD2 redistribution to the BIP ER pattern in P. falciparum","pmids":["8223485"],"confidence":"Medium","gaps":["BIP used only as a marker; no new mechanistic role for BIP itself","No interaction data"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1993,"claim":"Stage profiling asked whether BIP expression varies across the life cycle, revealing strong induction in liver stages and absence in sporozoites.","evidence":"Western blot and immunofluorescence of cultured exoerythrocytic stages in P. berghei (HepG2-A16) and P. falciparum (human hepatocytes in SCID mice)","pmids":["8475027"],"confidence":"Low","gaps":["Single study, expression only, no functional follow-up specific to BIP","Mechanism of stage-specific induction unknown"],"attribution":[{"species":"Plasmodium berghei","strain":""},{"species":"Plasmodium falciparum","strain":""}]},{"year":2003,"claim":"Co-localization with COPII coat proteins and export-compartment markers addressed whether BIP participates in parasite protein export, linking the ER to an early export domain.","evidence":"Co-localization immunofluorescence with Sar1p, Sec31p and PEC proteins under brefeldin A treatment in P. falciparum","pmids":["12850257"],"confidence":"Low","gaps":["Only partial co-localization, no functional assay on BIP","Export role remains inferential"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2018,"claim":"The ADP-bound crystal structure answered whether BIP has exploitable parasite-specific structural features, establishing it as a validated selective drug target.","evidence":"X-ray crystallography of the ATP-binding domain with ADP, recombinant inhibitor-binding characterization, and in vitro growth inhibition of drug-sensitive and drug-resistant P. falciparum","pmids":["29985421"],"confidence":"High","gaps":["Only the ATP-binding domain resolved; substrate-binding domain not structurally defined","Inhibitor selectivity over human GRP78 in cells not fully quantified"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2019,"claim":"Identifying the PfGRP170 interaction and PK4 activation upon PfGRP170 loss placed BIP within a defined ER co-chaperone module and the parasite unfolded protein response.","evidence":"Reciprocal co-immunoprecipitation, TetR-DOZI conditional mutagenesis of PfGRP170, and immunofluorescence in P. falciparum","pmids":["31087747"],"confidence":"Medium","gaps":["Direct chaperone cycle between BIP and PfGRP170 not reconstituted","Whether BIP loss itself triggers PK4 not tested","Client proteins of the complex unidentified"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2020,"claim":"Mass-spectrometric identification of the 68-kDa PEC component as BIP resolved the molecular identity of an export-compartment marker, reinforcing a role in host-cell protein export.","evidence":"Affinity purification with anti-PEC monoclonal antibody, peptide mapping mass spectrometry, and immunofluorescence in P. falciparum","pmids":["32529065"],"confidence":"Medium","gaps":["Functional contribution of BIP to export not directly demonstrated","Client cargo not defined"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2021,"claim":"ChIP-seq mapping of PfGCN5 to the BIP locus answered how BIP expression is controlled under artemisinin stress, linking it to epigenetic regulation and the drug-resistance response.","evidence":"ChIP-seq of PfGCN5 binding and qRT-PCR expression analysis in artemisinin-exposed P. falciparum","pmids":["33441725"],"confidence":"Medium","gaps":["Causal requirement of PfGCN5 for BIP induction not tested by perturbation","Downstream consequence of BIP upregulation for resistance unresolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2022,"claim":"Fragment-based crystallographic screening extended the drug-target case by mapping druggable sites on the ATP-binding domain distinct from human GRP78.","evidence":"X-ray crystallography ligand-soaking screen of 233 compounds identifying eight nucleoside-analogue hits, validated by protein thermal shift assay, on P. falciparum BIP","pmids":["36275624"],"confidence":"High","gaps":["Hits not advanced to cellular potency or selectivity data","No lead optimization or in vivo validation"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":null,"claim":"The physiological client proteins of BIP and its direct mechanistic contribution to protein export to the host erythrocyte remain undefined.","evidence":"","pmids":[],"confidence":"Low","gaps":["No BIP substrate/client repertoire identified","Export role established only by localization, not by loss-of-function","No conditional-knockdown phenotype for BIP itself reported"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":["BIP–PfGRP170 ER co-chaperone complex [#6]","Plasmodium export compartment (PEC) [#4, #7]"],"partners":["PFGRP170 (ER CO-CHAPERONE, RECIPROCAL CO-IP) [#6]","PFGCN5 (HISTONE ACETYLTRANSFERASE BINDING BIP LOCUS) [#8]"],"other_free_text":["Non-canonical C-terminal SDEL ER-retention signal proposed to act like KDEL [#0, #1]","Synthesis not induced by heat shock or classical mammalian GRP78 stress inducers, unlike cytosolic PfHsp70 [#1]","Strongly upregulated in P. berghei and P. falciparum liver stages, absent in sporozoites [#3]","Transcriptionally upregulated under artemisinin/stress conditions, linked to resistance response [#8]","ATP-binding domain crystallized with ADP and nucleoside-analogue fragments; parasite-specific active-site features validate BIP as a selective drug target [#5, #9]","Recombinant BIP inhibition by repurposed chaperone/anticancer inhibitors is lethal to drug-sensitive and drug-resistant parasites [#5]"]}},"prefetch_data":{},"corpus_meta":[{"pmid":"8153120","id":"PMC_8153120","title":"Demonstration 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70-1.","date":"2026","source":"Antimicrobial agents and chemotherapy","url":"https://pubmed.ncbi.nlm.nih.gov/42390429","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["heat shock protein 70"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"12563736","id":"PMC_12563736","title":"[Finding of new FCC1/HN antigenic expressed sequence tag(ESTs) of Plasmodium falciparum].","date":"1999","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/12563736","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["heat shock protein 70"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":42154,"output_tokens":3903,"usd":0.092504,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8685,"output_tokens":4263,"usd":0.075,"stage2_stop_reason":"end_turn"},"total_usd":0.167504,"stage1_batch_id":"msgbatch_01DisAaTypwmC8QwdMBuePHo","stage2_batch_id":"msgbatch_0184zxZTqxiEfdYYfPMfkqjb","note":"batch pricing = 50% of standard"},"stage1_raw":"I need to carefully identify which papers are about PF3D7_0917900 (BIP/PfGRP78/PfHSP70-2, the ER-resident HSP70) versus other HSP70 family members in P. falciparum.\n\nKey disambiguation:\n- PF3D7_0917900 = BIP = PfHSP70-2 = GRP78 = the ER-resident HSP70 with SDEL/DEL C-terminal sequence\n- PfHsp70-1 (PF3D7_0818900) = the major cytosolic HSP70 — this is the one most papers call \"PfHsp70-1\"\n- PfHsp70-x = exported HSP70\n- PfHsp70-3 = mitochondrial\n- PfHsp70-z = Hsp110-like cytosolic\n\nPapers specifically about PF3D7_0917900 (BIP/GRP78/PfHSP70-2/PfGRP78):\n- PMID 3045815: Kumar et al. 1988 — describes the gene encoding a protein similar to 78-kDa GRP, notes SDEL sequence → this IS BIP\n- PMID 1779989: Kumar et al. 1991 — describes Pfgrp (BIP) localization to ER, SDEL sequence → this IS BIP\n- PMID 8223485: Elmendorf & Haldar 1993 — uses BiP as ER marker → mentions BIP localization\n- PMID 29985421: Chen et al. 2018 — GRP78/BiP crystal structure, drug target → this IS BIP\n- PMID 36275624: Mrozek et al. 2022 — crystal structure of ATP binding domain of PfGRP78 → this IS BIP\n- PMID 31087747: Kudyba et al. 2019 — PfGRP170 interacts with BiP → this IS BIP\n- PMID 33441725: Rawat et al. 2021 — PfGCN5 binds BiP gene → regulatory\n- PMID 30183110: Mabate et al. 2018 — PfHsp70-x, NOT BIP\n- PMID 26267894: Zininga et al. 2015 — PfHop with PfHsp70-1, NOT BIP\n- PMID 34756988: ookinete Hsp70-1, NOT BIP\n- PMID 33147473: ookinete Hsp70-1 knockout, NOT BIP\n- PMID 8475027: Kumar et al. 1993 — mentions grp78 in exoerythrocytic stages → BIP-relevant\n- PMID 42541611: In silico PfGrp78 — this IS BIP\n- PMID 37633420: Kelch13 interactors, HSP70 mentioned generically\n- PMID 38460641: Falstatin interacts with HSP70 — generic HSP70\n- PMID 24494818: PfDegP complex with PfHsp70 — which HSP70? likely PfHsp70-1\n\nLet me now extract only findings that are specifically about PF3D7_0917900 (BIP/PfGRP78/PfHSP70-2):\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1988,\n      \"finding\": \"PF3D7_0917900 (BIP/PfGRP78) was identified as a P. falciparum gene encoding a protein similar to the mammalian 78-kDa glucose-regulated protein (GRP78). The gene is expressed during asexual and sexual erythrocytic stages (RNA blot analysis), and a 72-kDa protein is immunoprecipitated from erythrocytic-stage parasites. The deduced protein sequence contains only three of the four canonical C-terminal ER-retention amino acids (Asp-Glu-Leu), suggesting possible ER localization.\",\n      \"method\": \"Genomic DNA cloning, RNA blot analysis, immunoprecipitation, sequence homology analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — immunoprecipitation plus RNA blot and sequence analysis in single study, single lab\",\n      \"pmids\": [\"3045815\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"PF3D7_0917900 (BIP/Pfgrp) localization was determined by immuno-gold electron microscopy to be primarily cytoplasmic, consistent with endoplasmic reticulum localization. Its synthesis was not induced by heat shock (unlike the cytosolic PfHsp70), nor by glucose deprivation, calcium ionophore A23187, tunicamycin, or 2-deoxyglucose, distinguishing its stress-response profile from canonical GRP78 inducers in mammalian cells. The C-terminal SDEL sequence was proposed to function similarly to KDEL in mammalian ER retention.\",\n      \"method\": \"Immuno-gold electron microscopy, metabolic labeling, Northern blot analysis, in vitro translation\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct subcellular localization by immuno-gold EM combined with multiple biochemical induction assays, single lab\",\n      \"pmids\": [\"1779989\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"PF3D7_0917900 (BIP) was used as a validated ER marker in P. falciparum. Upon treatment with brefeldin A (BFA), the localization of PfERD2 (normally in a single perinuclear Golgi focus) redistributed to a diffuse pattern similar to that of parasite BIP (ER marker), establishing that BIP resides in the parasite ER and that its localization is distinct from the cis-Golgi compartment.\",\n      \"method\": \"Indirect immunofluorescence, brefeldin A treatment, subcellular fractionation\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct immunofluorescence localization with pharmacological perturbation (BFA), single lab, single study\",\n      \"pmids\": [\"8223485\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"PF3D7_0917900 (BIP/PfGRP78) expression was markedly induced in the hepatic (exoerythrocytic) stages of P. berghei (cultured in HepG2-A16 cells) and P. falciparum (in human hepatocytes in SCID mice), whereas expression was undetectable in sporozoites, establishing stage-specific upregulation of BIP during liver-stage development.\",\n      \"method\": \"Western blot, immunofluorescence of cultured exoerythrocytic stages\",\n      \"journal\": \"Parasitology research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single study, Western blot and immunofluorescence only, no functional follow-up specific to BIP\",\n      \"pmids\": [\"8475027\"],\n      \"is_preprint\": false,\n      \"attribution\": [\n        {\"species\": \"Plasmodium berghei\", \"strain\": \"\"},\n        {\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}\n      ]\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"PF3D7_0917900 (BIP) partially co-localizes with COPII coat proteins (Sar1p and Sec31p) and the 68 kDa and 22 kDa proteins of the Plasmodium export compartment (PEC), a brefeldin A-sensitive compartment proposed to be an early step in protein export from the parasite to the infected erythrocyte. This suggests the PEC is a domain of the ER or closely related to it.\",\n      \"method\": \"Co-localization immunofluorescence microscopy, brefeldin A treatment\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single-lab co-localization study, partial overlap only, no functional assay specific to BIP\",\n      \"pmids\": [\"12850257\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The crystal structure of the ATP-binding domain of P. falciparum GRP78 (PF3D7_0917900/BIP) was determined in complex with ADP. The structure revealed structural features unique to the parasite relative to human GRP78. Recombinant PfGRP78 was shown to be lethal to drug-sensitive and drug-resistant P. falciparum strains in vitro when inhibited by repurposed chaperone inhibitors (anticancer agents), and inhibitor binding to recombinant PfGRP78 was characterized biochemically, establishing BIP as a valid drug target.\",\n      \"method\": \"X-ray crystallography, recombinant protein binding characterization, in vitro parasite growth inhibition assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure determination with ADP, combined with in vitro functional inhibition and parasite growth assays, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"29985421\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PF3D7_0917900 (BIP) physically interacts with the ER chaperone PfGRP170 in P. falciparum, as demonstrated by co-immunoprecipitation. Loss of PfGRP170 function (conditional mutant) led to activation of the P. falciparum eIF2α kinase PK4, placing BIP within the parasite unfolded protein response/ER stress pathway. BIP localizes to the parasite ER.\",\n      \"method\": \"Co-immunoprecipitation, conditional mutagenesis (TetR-DOZI system), immunofluorescence\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP establishing direct interaction, combined with conditional KO and functional pathway readout, single lab\",\n      \"pmids\": [\"31087747\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PF3D7_0917900 (BIP/PfHSP70-2) was identified as the 68 kDa protein recognized by a monoclonal antibody against the Plasmodium export compartment (PEC), by affinity purification and peptide mapping mass spectrometry. This localizes BIP to the PEC, a domain of the ER, and suggests a role for BIP in the export of Plasmodium proteins to the host erythrocyte.\",\n      \"method\": \"Affinity purification, peptide mapping by mass spectrometry, immunofluorescence\",\n      \"journal\": \"Heliyon\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct protein identification by MS after affinity purification, single lab\",\n      \"pmids\": [\"32529065\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PfGCN5 (a histone acetyltransferase) was shown by ChIP-seq to directly bind to the BIP (PF3D7_0917900) gene locus in artemisinin-exposed P. falciparum, and BIP expression was upregulated under stress/artemisinin treatment conditions. This places BIP transcriptional regulation under epigenetic control via PfGCN5, linking BIP to the artemisinin resistance response.\",\n      \"method\": \"ChIP-seq (chromatin immunoprecipitation followed by sequencing), qRT-PCR expression analysis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq directly maps PfGCN5 binding at BIP locus; single lab but genomic-scale with gene-specific validation\",\n      \"pmids\": [\"33441725\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"A high-throughput crystal-based fragment screening approach identified eight nucleoside analogue 'hit' compounds binding at the active site of the ATP-binding domain of P. falciparum GRP78 (PF3D7_0917900/BIP), as determined by X-ray crystallography. Binding was further validated by protein thermal shift assays. This established druggable sites on the ATP-binding domain of BIP distinct from those exploitable in human GRP78.\",\n      \"method\": \"X-ray crystallography (ligand soaking screen of 233 compounds), protein thermal shift assay\",\n      \"journal\": \"Frontiers in molecular biosciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystallographic structures of BIP ATP-binding domain in complex with ligands, validated by orthogonal thermal shift assay, single lab\",\n      \"pmids\": [\"36275624\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"current_model\": \"PF3D7_0917900 (BIP/PfGRP78) is an ER-resident HSP70-class molecular chaperone in P. falciparum whose localization to the parasite ER is established by immuno-gold EM and immunofluorescence; it physically interacts with the ER co-chaperone PfGRP170 and participates in the unfolded protein response (linking to eIF2α kinase PK4 activation); its ATP-binding domain has been structurally resolved by X-ray crystallography (with ADP and with fragment ligands), revealing parasite-specific features that can be exploited for selective inhibition; BIP expression is transcriptionally upregulated by the histone acetyltransferase PfGCN5 under artemisinin/stress conditions; and it partially localizes to the Plasmodium export compartment, suggesting a role in protein export to the host erythrocyte.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PF3D7_0917900 (BIP/PfGRP78) is an ER-resident HSP70-class molecular chaperone of Plasmodium falciparum, encoded by a gene expressed across asexual and sexual erythrocytic stages and homologous to mammalian GRP78 [#0]. Its ER residence is established directly by immuno-gold electron microscopy and by immunofluorescence, where it serves as a validated parasite ER marker distinct from the cis-Golgi, consistent with its non-canonical C-terminal SDEL retention signal [#1, #2]. Unlike mammalian GRP78, BIP synthesis is not induced by heat shock, glucose deprivation, or classical ER-stress agents, defining a distinct stress-response profile [#1]. Functionally, BIP operates within the parasite ER quality-control machinery: it physically interacts with the ER co-chaperone PfGRP170 by reciprocal co-immunoprecipitation, and loss of PfGRP170 activates the eIF2\\u03b1 kinase PK4, placing BIP within the parasite unfolded protein response [#6]. BIP transcription is upregulated under artemisinin and stress conditions through direct binding of the histone acetyltransferase PfGCN5 at its locus, linking it to the artemisinin resistance response [#8]. Beyond the canonical ER pool, BIP partially localizes to the brefeldin A-sensitive Plasmodium export compartment and was identified as its 68-kDa component by mass spectrometry, implicating it in early steps of protein export to the host erythrocyte [#4, #7]. The ATP-binding domain of BIP has been resolved crystallographically with ADP and with nucleoside-analogue fragment ligands, revealing parasite-specific active-site features exploitable for selective inhibition, and recombinant BIP is susceptible to chaperone inhibitors lethal to drug-sensitive and drug-resistant parasites, establishing it as a validated drug target [#5, #9].\",\n  \"teleology\": [\n    {\n      \"year\": 1988,\n      \"claim\": \"Establishing that P. falciparum encodes a GRP78-like chaperone answered whether the parasite possesses a dedicated ER HSP70 homolog, and its erythrocytic-stage expression defined when it is present.\",\n      \"evidence\": \"Genomic cloning, RNA blot, and immunoprecipitation of a 72-kDa protein with sequence homology analysis in P. falciparum\",\n      \"pmids\": [\"3045815\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Subcellular localization inferred only from partial ER-retention signal, not directly shown\", \"No chaperone activity demonstrated\", \"No binding partners identified\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1991,\n      \"claim\": \"Direct localization resolved where BIP resides and whether it behaves like mammalian GRP78, showing it is an ER protein with a distinct, non-inducible stress-response profile.\",\n      \"evidence\": \"Immuno-gold EM, metabolic labeling, and induction assays (heat, glucose deprivation, A23187, tunicamycin, 2-deoxyglucose) in P. falciparum\",\n      \"pmids\": [\"1779989\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"SDEL retention mechanism proposed but not functionally tested\", \"No molecular partners defined\", \"Chaperone/folding function not assayed\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Using BIP as a reference marker confirmed its ER identity relative to the Golgi, resolving compartmental assignment within the parasite secretory pathway.\",\n      \"evidence\": \"Indirect immunofluorescence with brefeldin A perturbation and subcellular fractionation, comparing PfERD2 redistribution to the BIP ER pattern in P. falciparum\",\n      \"pmids\": [\"8223485\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"BIP used only as a marker; no new mechanistic role for BIP itself\", \"No interaction data\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Stage profiling asked whether BIP expression varies across the life cycle, revealing strong induction in liver stages and absence in sporozoites.\",\n      \"evidence\": \"Western blot and immunofluorescence of cultured exoerythrocytic stages in P. berghei (HepG2-A16) and P. falciparum (human hepatocytes in SCID mice)\",\n      \"pmids\": [\"8475027\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single study, expression only, no functional follow-up specific to BIP\", \"Mechanism of stage-specific induction unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}, {\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Co-localization with COPII coat proteins and export-compartment markers addressed whether BIP participates in parasite protein export, linking the ER to an early export domain.\",\n      \"evidence\": \"Co-localization immunofluorescence with Sar1p, Sec31p and PEC proteins under brefeldin A treatment in P. falciparum\",\n      \"pmids\": [\"12850257\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Only partial co-localization, no functional assay on BIP\", \"Export role remains inferential\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"The ADP-bound crystal structure answered whether BIP has exploitable parasite-specific structural features, establishing it as a validated selective drug target.\",\n      \"evidence\": \"X-ray crystallography of the ATP-binding domain with ADP, recombinant inhibitor-binding characterization, and in vitro growth inhibition of drug-sensitive and drug-resistant P. falciparum\",\n      \"pmids\": [\"29985421\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Only the ATP-binding domain resolved; substrate-binding domain not structurally defined\", \"Inhibitor selectivity over human GRP78 in cells not fully quantified\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identifying the PfGRP170 interaction and PK4 activation upon PfGRP170 loss placed BIP within a defined ER co-chaperone module and the parasite unfolded protein response.\",\n      \"evidence\": \"Reciprocal co-immunoprecipitation, TetR-DOZI conditional mutagenesis of PfGRP170, and immunofluorescence in P. falciparum\",\n      \"pmids\": [\"31087747\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct chaperone cycle between BIP and PfGRP170 not reconstituted\", \"Whether BIP loss itself triggers PK4 not tested\", \"Client proteins of the complex unidentified\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Mass-spectrometric identification of the 68-kDa PEC component as BIP resolved the molecular identity of an export-compartment marker, reinforcing a role in host-cell protein export.\",\n      \"evidence\": \"Affinity purification with anti-PEC monoclonal antibody, peptide mapping mass spectrometry, and immunofluorescence in P. falciparum\",\n      \"pmids\": [\"32529065\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional contribution of BIP to export not directly demonstrated\", \"Client cargo not defined\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"ChIP-seq mapping of PfGCN5 to the BIP locus answered how BIP expression is controlled under artemisinin stress, linking it to epigenetic regulation and the drug-resistance response.\",\n      \"evidence\": \"ChIP-seq of PfGCN5 binding and qRT-PCR expression analysis in artemisinin-exposed P. falciparum\",\n      \"pmids\": [\"33441725\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal requirement of PfGCN5 for BIP induction not tested by perturbation\", \"Downstream consequence of BIP upregulation for resistance unresolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Fragment-based crystallographic screening extended the drug-target case by mapping druggable sites on the ATP-binding domain distinct from human GRP78.\",\n      \"evidence\": \"X-ray crystallography ligand-soaking screen of 233 compounds identifying eight nucleoside-analogue hits, validated by protein thermal shift assay, on P. falciparum BIP\",\n      \"pmids\": [\"36275624\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Hits not advanced to cellular potency or selectivity data\", \"No lead optimization or in vivo validation\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The physiological client proteins of BIP and its direct mechanistic contribution to protein export to the host erythrocyte remain undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No BIP substrate/client repertoire identified\", \"Export role established only by localization, not by loss-of-function\", \"No conditional-knockdown phenotype for BIP itself reported\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140662\", \"supporting_discovery_ids\": [0, 5]},\n      {\"term_id\": \"GO:0005524\", \"supporting_discovery_ids\": [5, 9]},\n      {\"term_id\": \"GO:0051082\", \"supporting_discovery_ids\": [0, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005788\", \"supporting_discovery_ids\": [1, 2, 6]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0030968\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"GO:0006986\", \"supporting_discovery_ids\": [1, 8]}\n    ],\n    \"complexes\": [\n      \"BIP–PfGRP170 ER co-chaperone complex [#6]\",\n      \"Plasmodium export compartment (PEC) [#4, #7]\"\n    ],\n    \"partners\": [\n      \"PfGRP170 (ER co-chaperone, reciprocal co-IP) [#6]\",\n      \"PfGCN5 (histone acetyltransferase binding BIP locus) [#8]\"\n    ],\n    \"other_free_text\": [\n      \"Non-canonical C-terminal SDEL ER-retention signal proposed to act like KDEL [#0, #1]\",\n      \"Synthesis not induced by heat shock or classical mammalian GRP78 stress inducers, unlike cytosolic PfHsp70 [#1]\",\n      \"Strongly upregulated in P. berghei and P. falciparum liver stages, absent in sporozoites [#3]\",\n      \"Transcriptionally upregulated under artemisinin/stress conditions, linked to resistance response [#8]\",\n      \"ATP-binding domain crystallized with ADP and nucleoside-analogue fragments; parasite-specific active-site features validate BIP as a selective drug target [#5, #9]\",\n      \"Recombinant BIP inhibition by repurposed chaperone/anticancer inhibitors is lethal to drug-sensitive and drug-resistant parasites [#5]\"\n    ]\n  }\n}","audit_flag":{"gene":"PF3D7_0917900","tier":"IDENTITY_CHECK","verdict":"identity unverified","subtype":"names_other_cards","uniprot_band":"","rules_fired":"R12","issue":"No cited paper names this card; 6 of 10 cited papers name other catalogue genes (PF3D7_0818900, PF3D7_1353600, PF3D7_0823300). The summary may describe one of those genes."},"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_0917900","name":null,"product":"heat shock protein 70","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PbANKA","gene_id":"PBANKA_0818900","name":null,"product":"endoplasmic reticulum chaperone BiP, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_0715900","name":null,"product":"endoplasmic reticulum chaperone BiP, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"BIP","evaluation":null}