{"gene":"PF3D7_0404500","run_date":"2026-09-07T10:55:51","timeline":{"discoveries":[{"year":2005,"finding":"P52 (referred to as P36p in P. berghei) is required for normal liver-stage development: p36p-deficient P. berghei sporozoites infect and traverse hepatocytes normally but abort development within the hepatocyte, indicating P52 is dispensable for hepatocyte invasion but essential for intrahepatocytic development.","method":"Targeted gene deletion (knockout) in P. berghei with in vivo and in vitro liver-stage development assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic knockout with defined cellular phenotype (developmental arrest), replicated in subsequent studies across multiple labs and species","pmids":["16103357"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2007,"finding":"Simultaneous deletion of P52 and P36 in P. yoelii results in sporozoites that fail to form a parasitophorous vacuole (PV) within hepatocytes in vitro and in vivo; parasites instead localize as free entities in the host cell cytoplasm or nucleoplasm and do not develop as liver stages, demonstrating that P52 and P36 together are essential for PV formation during hepatocyte invasion.","method":"Simultaneous double-gene deletion by single genetic manipulation; immunofluorescence analysis and electron microscopy of infected hepatocytes in vitro and in vivo","journal":"Infection and immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — double-knockout with two orthogonal imaging methods (IFA and EM), replicated in P. berghei and P. falciparum by independent labs","pmids":["17517871"],"is_preprint":false,"attribution":[{"species":"Plasmodium yoelii","strain":""}]},{"year":2008,"finding":"Disruption of P52 in P. falciparum generates sporozoites with normal gliding motility, cell traversal, and hepatocyte invasion rates, but developmental arrest occurs very soon after invasion of primary human hepatocytes, confirming that P52 is required for intrahepatocytic development but not for invasion.","method":"Gene disruption by double-crossover recombination in P. falciparum; in vitro liver-stage growth assay with primary human hepatocytes","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockout with defined cellular phenotype in primary human hepatocytes, consistent with rodent model findings","pmids":["18958160"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2008,"finding":"SAP1 deletion in P. yoelii abolishes expression of P52 (along with UIS3 and UIS4) but not constitutively expressed sporozoite proteins such as CSP and TRAP, placing SAP1 upstream of P52 in a post-transcriptional gene expression control pathway.","method":"Targeted gene deletion of SAP1 followed by RT-PCR/expression analysis of downstream genes in P. yoelii","journal":"Molecular microbiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis via knockout with expression analysis; single lab, two orthogonal methods (deletion phenotype + gene expression measurement)","pmids":["18466298"],"is_preprint":false,"attribution":[{"species":"Plasmodium yoelii","strain":""}]},{"year":2012,"finding":"The s48/45 domain of 6-cysteine proteins (the domain shared by P52 and other family members including Pf12) adopts a β-sandwich fold formed by two sheets with mixed parallel and antiparallel strands, with three disulfide bonds among six conserved cysteines; this domain is structurally related to the SAG1-related-sequence (SRS) fold of Toxoplasma surface antigens and to ephrins.","method":"NMR structure determination of the C-terminal s48/45 domain of Pf12 (a representative 6-cys domain, the structure being attributed to the shared domain class that includes P52)","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — high-quality NMR structure, but determined for Pf12 not P52 itself; the structural inference for P52 is by domain homology within the same protein family","pmids":["22493233"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2015,"finding":"Lack of host hepatocyte EphA2 receptor phenocopies lack of P52 and P36 in sporozoites (failure to form a permissive PV), suggesting that the P36-P52 pathway converges on EphA2 for establishment of the replication-permissive compartment.","method":"Genetic deletion of EphA2 in mice combined with comparison to p52/p36-deficient sporozoite phenotype; sporozoite infection assays","journal":"Science (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — phenocopy epistasis experiment with genetic host knockout; single lab; the direct interaction shown for P36 not P52","pmids":["26612952"],"is_preprint":false,"attribution":[{"species":"Plasmodium yoelii","strain":""}]},{"year":2018,"finding":"P52 partially co-localizes with P36 in sporozoite secretory microneme organelles, and P36 and P52 form a protein complex in sporozoites as determined by co-immunoprecipitation; upon sporozoite stimulation, only P36 is released as a secreted protein while P52 is not, supporting a model in which putatively GPI-anchored P52 serves as a scaffold to facilitate the interaction of secreted P36 with the host cell during sporozoite invasion of hepatocytes.","method":"Immunofluorescence co-localization with P36mCherry-tagged P. yoelii parasites; co-immunoprecipitation from sporozoite lysates; secretion assay upon sporozoite stimulation","journal":"Frontiers in cellular and infection microbiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP establishing complex formation, combined with live imaging co-localization and stimulation secretion assay; multiple orthogonal methods in single study","pmids":["30547015"],"is_preprint":false,"attribution":[{"species":"Plasmodium yoelii","strain":""}]},{"year":2018,"finding":"Single deletion of P52 alone (without P36) in P. yoelii results in sporozoites that also lack a PV after hepatocyte invasion, phenocopying the dual p52/p36 deletion, demonstrating that P52 individually is equally essential for PV establishment and that both proteins act in the same pathway.","method":"Single-gene deletion of P52 in P. yoelii with IFA-based assessment of PV formation in infected hepatocytes","journal":"Frontiers in cellular and infection microbiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean single-gene knockout with defined cellular phenotype (PV absence), directly compared to dual knockout and wild type in same study","pmids":["30547015"],"is_preprint":false,"attribution":[{"species":"Plasmodium yoelii","strain":""}]},{"year":2023,"finding":"The beta-propeller domain of B9 (another 6-cys protein) interacts with both P36 and P52 in a heterologous expression system, suggesting P52 participates in a multi-protein invasion complex.","method":"Heterologous expression system interaction assay (co-expression/pulldown)","journal":"iScience","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single heterologous pulldown experiment, no validation in parasite context; interaction with P52 specifically not independently confirmed","pmids":["36761022"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2026,"finding":"AlphaFold-based structural modeling combined with electron microscopy and SAXS data indicate that P36 and P52 form a heterodimer with a head-to-tail architecture; the interaction interface is largely conserved among Plasmodium species. Antibodies targeting epitope tags inserted at membrane-distal sites on P52 can block sporozoite invasion of hepatocytes in culture, while antibodies targeting membrane-proximal sites lack inhibitory activity, identifying the membrane-distal face of the P36-P52 heterodimer as an antibody-accessible vulnerable site.","method":"AlphaFold structural modeling; electron microscopy; small-angle X-ray scattering (SAXS); epitope-tag insertion at defined structural positions; neutralization assays in P. berghei sporozoite-hepatocyte invasion model","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 1 / Strong — integrative structural approach (AF modeling + EM + SAXS) combined with functional epitope-tag neutralization assays using multiple tag positions; multiple orthogonal methods establishing structure-function relationship","pmids":["42418521"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":""}]}],"current_model":"P52 (PF3D7_0404500) is a 6-cysteine s48/45 family protein that localizes to sporozoite micronemes where it forms a heterodimeric complex with P36 in a head-to-tail architecture; P52 is putatively GPI-anchored and, while it is not secreted upon sporozoite activation, it acts as a scaffold to facilitate secretion-competent P36's engagement with hepatocyte receptors (including EphA2), and both proteins are individually and jointly essential for formation of the parasitophorous vacuole during hepatocyte invasion, with their loss resulting in growth-arrested parasites that reside freely in the host cell cytoplasm without establishing a replication-permissive compartment."},"narrative":{"mechanistic_narrative":"P52 (PF3D7_0404500) is a 6-cysteine s48/45 family protein essential for the transition from hepatocyte invasion to intrahepatocytic development in Plasmodium sporozoites [PMID:16103357, PMID:18958160]. In P. berghei and P. falciparum, P52-deficient sporozoites glide, traverse, and invade hepatocytes normally but arrest developmentally immediately after invasion [PMID:16103357, PMID:18958160]. This arrest reflects a failure to establish a replication-permissive parasitophorous vacuole: in P. yoelii, deletion of P52 alone, of P36 alone, or of both together yields parasites that reside free in the host cytoplasm or nucleoplasm without forming a PV, placing P52 and P36 in the same essential invasion pathway [PMID:17517871, PMID:30547015]. Mechanistically, P52 partially co-localizes with P36 in sporozoite micronemes and forms a heterodimeric complex with it; upon sporozoite stimulation only P36 is secreted while putatively GPI-anchored P52 is retained, supporting a model in which P52 acts as a membrane-tethered scaffold that presents secretion-competent P36 to the host cell [PMID:30547015]. Structural analysis indicates a head-to-tail P36-P52 heterodimer whose membrane-distal face constitutes an antibody-accessible site that can be blocked to inhibit invasion [PMID:42418521]. The host-cell effector of this pathway is the hepatocyte EphA2 receptor, whose loss phenocopies loss of P52/P36 [PMID:26612952]. Beyond its role in this microneme complex and hepatocyte-invasion pathway, no additional biochemical function of P52 has been characterized in the available corpus.","teleology":[{"year":2005,"claim":"Established that P52 acts after sporozoite entry rather than during invasion itself, resolving whether the protein functions in cell penetration or in subsequent development.","evidence":"Targeted gene knockout in P. berghei with in vivo and in vitro liver-stage assays","pmids":["16103357"],"confidence":"High","gaps":["Molecular reason for developmental arrest not defined","No partner or host receptor identified","Phenotype shown only in rodent parasite"],"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2007,"claim":"Defined the cell-biological lesion behind the arrest by showing that P52 (with P36) is required to build the parasitophorous vacuole, so parasites without it lie free in the host cell.","evidence":"Simultaneous double-gene deletion in P. yoelii with IFA and electron microscopy of infected hepatocytes in vitro and in vivo","pmids":["17517871"],"confidence":"High","gaps":["Did not separate P52 and P36 individual contributions","Molecular mechanism of PV formation unaddressed","No structural or interaction data"],"attribution":[{"species":"Plasmodium yoelii","strain":""}]},{"year":2008,"claim":"Extended the invasion-competent, development-defective phenotype to the human parasite, showing P52's role is conserved and relevant to human infection.","evidence":"Double-crossover gene disruption in P. falciparum with in vitro growth assay in primary human hepatocytes","pmids":["18958160"],"confidence":"High","gaps":["Mechanism of arrest not defined in P. falciparum","No interaction partners tested","PV-formation defect not directly imaged"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2008,"claim":"Placed P52 within a post-transcriptional regulatory hierarchy by showing SAP1 is required for its expression, distinguishing stage-specific from constitutive sporozoite proteins.","evidence":"SAP1 knockout with downstream expression analysis (RT-PCR) in P. yoelii","pmids":["18466298"],"confidence":"Medium","gaps":["Mechanism of SAP1 control not resolved","Does not address P52 protein function","Single-lab epistasis result"],"attribution":[{"species":"Plasmodium yoelii","strain":""}]},{"year":2012,"claim":"Provided a structural framework for the s48/45 domain shared by P52, revealing a beta-sandwich fold related to Toxoplasma SRS antigens and ephrins.","evidence":"NMR structure of the Pf12 s48/45 domain, a representative family member, with inference to P52 by domain homology","pmids":["22493233"],"confidence":"Medium","gaps":["Structure determined for Pf12, not P52 itself","No experimental structure of P52","Functional consequence of the fold for P52 not shown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2015,"claim":"Identified the host-side effector of the pathway by showing hepatocyte EphA2 loss phenocopies P52/P36 loss, linking the parasite complex to a defined receptor.","evidence":"Genetic EphA2 deletion in mice with sporozoite infection assays and phenotype comparison in P. yoelii","pmids":["26612952"],"confidence":"Medium","gaps":["Direct interaction demonstrated for P36, not P52","Phenocopy is correlative for P52 specifically","Single-lab result in rodent model"],"attribution":[{"species":"Plasmodium yoelii","strain":""}]},{"year":2018,"claim":"Resolved P52's molecular role by demonstrating a micronemal P36-P52 complex in which only P36 is secreted, casting P52 as a retained scaffold, and showing P52 alone is sufficient for the PV defect.","evidence":"Co-IP, mCherry co-localization imaging, stimulation-secretion assay, and single-gene deletion in P. yoelii","pmids":["30547015"],"confidence":"High","gaps":["GPI anchoring of P52 inferred, not directly demonstrated","How P52 scaffolding enables P36-host engagement not resolved at molecular level","Shown in rodent parasite only"],"attribution":[{"species":"Plasmodium yoelii","strain":""}]},{"year":2023,"claim":"Suggested P52 participates in a larger invasion assembly by detecting interaction of the B9 beta-propeller with P52 in a heterologous system.","evidence":"Co-expression/pulldown in a heterologous expression system for P. falciparum proteins","pmids":["36761022"],"confidence":"Low","gaps":["Single heterologous pulldown, not validated in parasites","P52-specific interaction not independently confirmed","Functional significance of a B9-P52 complex untested"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2026,"claim":"Defined the architecture of the P36-P52 heterodimer and mapped a functionally vulnerable, antibody-accessible surface, connecting structure to invasion-blocking activity.","evidence":"AlphaFold modeling, EM, SAXS, and epitope-tag neutralization assays in the P. berghei sporozoite-hepatocyte invasion model","pmids":["42418521"],"confidence":"High","gaps":["Model relies partly on prediction rather than a solved crystal/cryo-EM structure","Host receptor contact on the P52 face not directly mapped","Neutralization shown via inserted epitope tags in rodent parasite"],"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":null,"claim":"How the P52-P36 complex mechanistically drives parasitophorous vacuole biogenesis downstream of EphA2 engagement, and whether P52's putative GPI anchor and scaffolding are direct requirements for that step, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No direct demonstration of P52-host receptor contact","Molecular link between P36 secretion and PV membrane formation unknown","GPI anchoring of P52 not experimentally confirmed"],"attribution":[{"species":"Plasmodium yoelii","strain":""}]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":["P36-P52 heterodimer (micronemal 6-cysteine complex)"],"partners":["P36 (6-CYS PROTEIN, HETERODIMER PARTNER)","B9 (6-CYS PROTEIN, BETA-PROPELLER DOMAIN; HETEROLOGOUS INTERACTION ONLY)","HOST HEPATOCYTE EPHA2 (PATHWAY EFFECTOR; DIRECT INTERACTION SHOWN FOR P36)"],"other_free_text":["P52 (PF3D7_0404500) is a 6-cysteine s48/45 family protein; the s48/45 beta-sandwich fold is characterized structurally for the family member Pf12, not for P52 itself [#4].","P52 is putatively GPI-anchored and is retained (not secreted) upon sporozoite stimulation, unlike its partner P36 [#6].","P52 expression depends on SAP1 via a post-transcriptional control pathway [#3].","The membrane-distal face of the P36-P52 heterodimer is an antibody-accessible invasion-blocking site [#9]."]}},"prefetch_data":{},"corpus_meta":[{"pmid":"16103357","id":"PMC_16103357","title":"Genetically attenuated, P36p-deficient malarial sporozoites induce protective immunity and apoptosis of infected liver cells.","date":"2005","source":"Proceedings of the National 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pathogens","url":"https://pubmed.ncbi.nlm.nih.gov/42418521","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["P52"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":14560,"output_tokens":2873,"usd":0.043388,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8502,"output_tokens":3607,"usd":0.066342,"stage2_stop_reason":"end_turn"},"total_usd":0.10973,"stage1_batch_id":"msgbatch_01DbiymDmubkPpYvdbAu5a7V","stage2_batch_id":"msgbatch_012TbrWvMRH129T7PQ4SmvrJ","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2005,\n      \"finding\": \"P52 (referred to as P36p in P. berghei) is required for normal liver-stage development: p36p-deficient P. berghei sporozoites infect and traverse hepatocytes normally but abort development within the hepatocyte, indicating P52 is dispensable for hepatocyte invasion but essential for intrahepatocytic development.\",\n      \"method\": \"Targeted gene deletion (knockout) in P. berghei with in vivo and in vitro liver-stage development assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic knockout with defined cellular phenotype (developmental arrest), replicated in subsequent studies across multiple labs and species\",\n      \"pmids\": [\"16103357\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Simultaneous deletion of P52 and P36 in P. yoelii results in sporozoites that fail to form a parasitophorous vacuole (PV) within hepatocytes in vitro and in vivo; parasites instead localize as free entities in the host cell cytoplasm or nucleoplasm and do not develop as liver stages, demonstrating that P52 and P36 together are essential for PV formation during hepatocyte invasion.\",\n      \"method\": \"Simultaneous double-gene deletion by single genetic manipulation; immunofluorescence analysis and electron microscopy of infected hepatocytes in vitro and in vivo\",\n      \"journal\": \"Infection and immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — double-knockout with two orthogonal imaging methods (IFA and EM), replicated in P. berghei and P. falciparum by independent labs\",\n      \"pmids\": [\"17517871\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium yoelii\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Disruption of P52 in P. falciparum generates sporozoites with normal gliding motility, cell traversal, and hepatocyte invasion rates, but developmental arrest occurs very soon after invasion of primary human hepatocytes, confirming that P52 is required for intrahepatocytic development but not for invasion.\",\n      \"method\": \"Gene disruption by double-crossover recombination in P. falciparum; in vitro liver-stage growth assay with primary human hepatocytes\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knockout with defined cellular phenotype in primary human hepatocytes, consistent with rodent model findings\",\n      \"pmids\": [\"18958160\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"SAP1 deletion in P. yoelii abolishes expression of P52 (along with UIS3 and UIS4) but not constitutively expressed sporozoite proteins such as CSP and TRAP, placing SAP1 upstream of P52 in a post-transcriptional gene expression control pathway.\",\n      \"method\": \"Targeted gene deletion of SAP1 followed by RT-PCR/expression analysis of downstream genes in P. yoelii\",\n      \"journal\": \"Molecular microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis via knockout with expression analysis; single lab, two orthogonal methods (deletion phenotype + gene expression measurement)\",\n      \"pmids\": [\"18466298\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium yoelii\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The s48/45 domain of 6-cysteine proteins (the domain shared by P52 and other family members including Pf12) adopts a β-sandwich fold formed by two sheets with mixed parallel and antiparallel strands, with three disulfide bonds among six conserved cysteines; this domain is structurally related to the SAG1-related-sequence (SRS) fold of Toxoplasma surface antigens and to ephrins.\",\n      \"method\": \"NMR structure determination of the C-terminal s48/45 domain of Pf12 (a representative 6-cys domain, the structure being attributed to the shared domain class that includes P52)\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — high-quality NMR structure, but determined for Pf12 not P52 itself; the structural inference for P52 is by domain homology within the same protein family\",\n      \"pmids\": [\"22493233\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Lack of host hepatocyte EphA2 receptor phenocopies lack of P52 and P36 in sporozoites (failure to form a permissive PV), suggesting that the P36-P52 pathway converges on EphA2 for establishment of the replication-permissive compartment.\",\n      \"method\": \"Genetic deletion of EphA2 in mice combined with comparison to p52/p36-deficient sporozoite phenotype; sporozoite infection assays\",\n      \"journal\": \"Science (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phenocopy epistasis experiment with genetic host knockout; single lab; the direct interaction shown for P36 not P52\",\n      \"pmids\": [\"26612952\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium yoelii\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"P52 partially co-localizes with P36 in sporozoite secretory microneme organelles, and P36 and P52 form a protein complex in sporozoites as determined by co-immunoprecipitation; upon sporozoite stimulation, only P36 is released as a secreted protein while P52 is not, supporting a model in which putatively GPI-anchored P52 serves as a scaffold to facilitate the interaction of secreted P36 with the host cell during sporozoite invasion of hepatocytes.\",\n      \"method\": \"Immunofluorescence co-localization with P36mCherry-tagged P. yoelii parasites; co-immunoprecipitation from sporozoite lysates; secretion assay upon sporozoite stimulation\",\n      \"journal\": \"Frontiers in cellular and infection microbiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP establishing complex formation, combined with live imaging co-localization and stimulation secretion assay; multiple orthogonal methods in single study\",\n      \"pmids\": [\"30547015\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium yoelii\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Single deletion of P52 alone (without P36) in P. yoelii results in sporozoites that also lack a PV after hepatocyte invasion, phenocopying the dual p52/p36 deletion, demonstrating that P52 individually is equally essential for PV establishment and that both proteins act in the same pathway.\",\n      \"method\": \"Single-gene deletion of P52 in P. yoelii with IFA-based assessment of PV formation in infected hepatocytes\",\n      \"journal\": \"Frontiers in cellular and infection microbiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean single-gene knockout with defined cellular phenotype (PV absence), directly compared to dual knockout and wild type in same study\",\n      \"pmids\": [\"30547015\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium yoelii\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"The beta-propeller domain of B9 (another 6-cys protein) interacts with both P36 and P52 in a heterologous expression system, suggesting P52 participates in a multi-protein invasion complex.\",\n      \"method\": \"Heterologous expression system interaction assay (co-expression/pulldown)\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single heterologous pulldown experiment, no validation in parasite context; interaction with P52 specifically not independently confirmed\",\n      \"pmids\": [\"36761022\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"AlphaFold-based structural modeling combined with electron microscopy and SAXS data indicate that P36 and P52 form a heterodimer with a head-to-tail architecture; the interaction interface is largely conserved among Plasmodium species. Antibodies targeting epitope tags inserted at membrane-distal sites on P52 can block sporozoite invasion of hepatocytes in culture, while antibodies targeting membrane-proximal sites lack inhibitory activity, identifying the membrane-distal face of the P36-P52 heterodimer as an antibody-accessible vulnerable site.\",\n      \"method\": \"AlphaFold structural modeling; electron microscopy; small-angle X-ray scattering (SAXS); epitope-tag insertion at defined structural positions; neutralization assays in P. berghei sporozoite-hepatocyte invasion model\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — integrative structural approach (AF modeling + EM + SAXS) combined with functional epitope-tag neutralization assays using multiple tag positions; multiple orthogonal methods establishing structure-function relationship\",\n      \"pmids\": [\"42418521\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    }\n  ],\n  \"current_model\": \"P52 (PF3D7_0404500) is a 6-cysteine s48/45 family protein that localizes to sporozoite micronemes where it forms a heterodimeric complex with P36 in a head-to-tail architecture; P52 is putatively GPI-anchored and, while it is not secreted upon sporozoite activation, it acts as a scaffold to facilitate secretion-competent P36's engagement with hepatocyte receptors (including EphA2), and both proteins are individually and jointly essential for formation of the parasitophorous vacuole during hepatocyte invasion, with their loss resulting in growth-arrested parasites that reside freely in the host cell cytoplasm without establishing a replication-permissive compartment.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"P52 (PF3D7_0404500) is a 6-cysteine s48/45 family protein essential for the transition from hepatocyte invasion to intrahepatocytic development in Plasmodium sporozoites [#0, #2]. In P. berghei and P. falciparum, P52-deficient sporozoites glide, traverse, and invade hepatocytes normally but arrest developmentally immediately after invasion [#0, #2]. This arrest reflects a failure to establish a replication-permissive parasitophorous vacuole: in P. yoelii, deletion of P52 alone, of P36 alone, or of both together yields parasites that reside free in the host cytoplasm or nucleoplasm without forming a PV, placing P52 and P36 in the same essential invasion pathway [#1, #7]. Mechanistically, P52 partially co-localizes with P36 in sporozoite micronemes and forms a heterodimeric complex with it; upon sporozoite stimulation only P36 is secreted while putatively GPI-anchored P52 is retained, supporting a model in which P52 acts as a membrane-tethered scaffold that presents secretion-competent P36 to the host cell [#6]. Structural analysis indicates a head-to-tail P36-P52 heterodimer whose membrane-distal face constitutes an antibody-accessible site that can be blocked to inhibit invasion [#9]. The host-cell effector of this pathway is the hepatocyte EphA2 receptor, whose loss phenocopies loss of P52/P36 [#5]. Beyond its role in this microneme complex and hepatocyte-invasion pathway, no additional biochemical function of P52 has been characterized in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 2005,\n      \"claim\": \"Established that P52 acts after sporozoite entry rather than during invasion itself, resolving whether the protein functions in cell penetration or in subsequent development.\",\n      \"evidence\": \"Targeted gene knockout in P. berghei with in vivo and in vitro liver-stage assays\",\n      \"pmids\": [\"16103357\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular reason for developmental arrest not defined\", \"No partner or host receptor identified\", \"Phenotype shown only in rodent parasite\"],\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined the cell-biological lesion behind the arrest by showing that P52 (with P36) is required to build the parasitophorous vacuole, so parasites without it lie free in the host cell.\",\n      \"evidence\": \"Simultaneous double-gene deletion in P. yoelii with IFA and electron microscopy of infected hepatocytes in vitro and in vivo\",\n      \"pmids\": [\"17517871\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not separate P52 and P36 individual contributions\", \"Molecular mechanism of PV formation unaddressed\", \"No structural or interaction data\"],\n      \"attribution\": [{\"species\": \"Plasmodium yoelii\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Extended the invasion-competent, development-defective phenotype to the human parasite, showing P52's role is conserved and relevant to human infection.\",\n      \"evidence\": \"Double-crossover gene disruption in P. falciparum with in vitro growth assay in primary human hepatocytes\",\n      \"pmids\": [\"18958160\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of arrest not defined in P. falciparum\", \"No interaction partners tested\", \"PV-formation defect not directly imaged\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Placed P52 within a post-transcriptional regulatory hierarchy by showing SAP1 is required for its expression, distinguishing stage-specific from constitutive sporozoite proteins.\",\n      \"evidence\": \"SAP1 knockout with downstream expression analysis (RT-PCR) in P. yoelii\",\n      \"pmids\": [\"18466298\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of SAP1 control not resolved\", \"Does not address P52 protein function\", \"Single-lab epistasis result\"],\n      \"attribution\": [{\"species\": \"Plasmodium yoelii\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Provided a structural framework for the s48/45 domain shared by P52, revealing a beta-sandwich fold related to Toxoplasma SRS antigens and ephrins.\",\n      \"evidence\": \"NMR structure of the Pf12 s48/45 domain, a representative family member, with inference to P52 by domain homology\",\n      \"pmids\": [\"22493233\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structure determined for Pf12, not P52 itself\", \"No experimental structure of P52\", \"Functional consequence of the fold for P52 not shown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified the host-side effector of the pathway by showing hepatocyte EphA2 loss phenocopies P52/P36 loss, linking the parasite complex to a defined receptor.\",\n      \"evidence\": \"Genetic EphA2 deletion in mice with sporozoite infection assays and phenotype comparison in P. yoelii\",\n      \"pmids\": [\"26612952\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct interaction demonstrated for P36, not P52\", \"Phenocopy is correlative for P52 specifically\", \"Single-lab result in rodent model\"],\n      \"attribution\": [{\"species\": \"Plasmodium yoelii\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Resolved P52's molecular role by demonstrating a micronemal P36-P52 complex in which only P36 is secreted, casting P52 as a retained scaffold, and showing P52 alone is sufficient for the PV defect.\",\n      \"evidence\": \"Co-IP, mCherry co-localization imaging, stimulation-secretion assay, and single-gene deletion in P. yoelii\",\n      \"pmids\": [\"30547015\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"GPI anchoring of P52 inferred, not directly demonstrated\", \"How P52 scaffolding enables P36-host engagement not resolved at molecular level\", \"Shown in rodent parasite only\"],\n      \"attribution\": [{\"species\": \"Plasmodium yoelii\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Suggested P52 participates in a larger invasion assembly by detecting interaction of the B9 beta-propeller with P52 in a heterologous system.\",\n      \"evidence\": \"Co-expression/pulldown in a heterologous expression system for P. falciparum proteins\",\n      \"pmids\": [\"36761022\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single heterologous pulldown, not validated in parasites\", \"P52-specific interaction not independently confirmed\", \"Functional significance of a B9-P52 complex untested\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Defined the architecture of the P36-P52 heterodimer and mapped a functionally vulnerable, antibody-accessible surface, connecting structure to invasion-blocking activity.\",\n      \"evidence\": \"AlphaFold modeling, EM, SAXS, and epitope-tag neutralization assays in the P. berghei sporozoite-hepatocyte invasion model\",\n      \"pmids\": [\"42418521\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Model relies partly on prediction rather than a solved crystal/cryo-EM structure\", \"Host receptor contact on the P52 face not directly mapped\", \"Neutralization shown via inserted epitope tags in rodent parasite\"],\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the P52-P36 complex mechanistically drives parasitophorous vacuole biogenesis downstream of EphA2 engagement, and whether P52's putative GPI anchor and scaffolding are direct requirements for that step, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct demonstration of P52-host receptor contact\", \"Molecular link between P36 secretion and PV membrane formation unknown\", \"GPI anchoring of P52 not experimentally confirmed\"],\n      \"attribution\": [{\"species\": \"Plasmodium yoelii\", \"strain\": \"\"}]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005515\", \"supporting_discovery_ids\": [6, 8, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0020009\", \"supporting_discovery_ids\": [6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0044409\", \"supporting_discovery_ids\": [0, 1, 2, 7]}\n    ],\n    \"complexes\": [\n      \"P36-P52 heterodimer (micronemal 6-cysteine complex)\"\n    ],\n    \"partners\": [\n      \"P36 (6-cys protein, heterodimer partner)\",\n      \"B9 (6-cys protein, beta-propeller domain; heterologous interaction only)\",\n      \"host hepatocyte EphA2 (pathway effector; direct interaction shown for P36)\"\n    ],\n    \"other_free_text\": [\n      \"P52 (PF3D7_0404500) is a 6-cysteine s48/45 family protein; the s48/45 beta-sandwich fold is characterized structurally for the family member Pf12, not for P52 itself [#4].\",\n      \"P52 is putatively GPI-anchored and is retained (not secreted) upon sporozoite stimulation, unlike its partner P36 [#6].\",\n      \"P52 expression depends on SAP1 via a post-transcriptional control pathway [#3].\",\n      \"The membrane-distal face of the P36-P52 heterodimer is an antibody-accessible invasion-blocking site [#9].\"\n    ]\n  }\n}","audit_flag":null,"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_0404500","name":null,"product":"6-cysteine protein P52","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PbANKA","gene_id":"PBANKA_1002200","name":null,"product":"6-cysteine protein P52","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_0302500","name":null,"product":"6-cysteine protein P52, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"P52","evaluation":null}