{"gene":"PF3D7_1035400","run_date":"2026-09-08T12:51:28","timeline":{"discoveries":[{"year":1994,"finding":"MSP3 (PF3D7_1035400) was identified as a 48 kDa merozoite surface protein of P. falciparum whose antibodies mediate parasite killing via cooperation with blood monocytes in an antibody-dependent cellular inhibition (ADCI) assay. Cytophilic antibodies from clinically protected individuals directed against MSP3 promoted monocyte-dependent inhibition of P. falciparum erythrocytic growth, whereas non-cytophilic antibodies from non-protected individuals did not.","method":"ADCI assay, purified IgG from immune and non-immune subjects, immunopurification on recombinant protein and synthetic peptides, mouse immunization","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — functional ADCI assay with purified antibodies, replicated with both human immune IgG and mouse antibodies raised against peptides, multiple orthogonal approaches in a single study","pmids":["8068948"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1994,"finding":"MSP3 is located on the surface of P. falciparum merozoites, detectable in all isolates tested, and contains B and T cell epitopes recognized by individuals living in endemic areas. Human antibodies purified on recombinant MSP3 or the synthetic peptide MSP-3b, as well as mouse antibodies, all promoted monocyte-mediated parasite killing in ADCI.","method":"ADCI assay, immunopurification on recombinant protein and synthetic peptide, mouse immunization, epidemiological peptide mapping","journal":"Memorias do Instituto Oswaldo Cruz","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ADCI functional assay, single lab, multiple antibody reagents confirming surface localization and ADCI activity","pmids":["7565137"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1997,"finding":"MSP3 is a secreted polymorphic antigen associated with erythrocytic schizonts and merozoites. Its prominent structural feature is a domain of three blocks of tandemly-repeated heptads with consensus AXXAXXX predicted to form alpha-helical secondary structure. Polymorphism is predominantly in the N-terminal half within and flanking the heptad-repeats. Antisera to conserved and variable regions identified the alanine heptad-repeat domain as a site of antigenic diversity using recombinant proteins and synthetic peptides.","method":"Gene sequencing of 4 isolates, recombinant protein production, synthetic peptide antisera, differential antibody reactivity assays","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — structural/sequence analysis combined with recombinant protein antisera reactivity, single lab, two orthogonal approaches","pmids":["9497029"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2000,"finding":"Anti-MSP3 antibodies affinity-purified on synthetic MSP3 peptides, when passively transferred into P. falciparum-infected humanized SCID mice reconstituted with human monocytes, consistently suppressed P. falciparum parasitemia. This suppression required concomitant human monocyte reconstitution; neither antibodies nor monocytes alone had direct effect, demonstrating the monocyte-dependent in vivo mechanism of MSP3-specific antibodies.","method":"Passive transfer of affinity-purified human anti-MSP3 antibodies into P. falciparum-infected immunodeficient mice reconstituted with human monocytes","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo passive transfer model with defined cell reconstitution, multiple controls, and direct comparison to hyperimmune IgG","pmids":["11104807"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2002,"finding":"Truncation of MSP3 by homologous recombination (removing the putative leucine zipper sequence at the C-terminus while retaining the glutamic acid-rich region and heptad repeats) prevented MSP3 from localizing to the parasitophorous vacuole or the merozoite surface. Furthermore, the acidic-basic repeat antigen (ABRA) also failed to localize to the merozoite surface in these truncated-MSP3 parasites, indicating that the leucine zipper region of MSP3 is required for trafficking of both MSP3 and ABRA. Merozoites lacking both MSP3 and ABRA on their surface showed reduced erythrocyte invasion.","method":"Homologous recombination gene disruption in P. falciparum, immunofluorescence/localization assays, erythrocyte invasion assays","journal":"Molecular microbiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic disruption with defined truncation, functional localization readout, invasion assay, multiple phenotypic consequences characterized in single study","pmids":["11952894"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2004,"finding":"Six overlapping peptides spanning the C-terminal conserved half of MSP3 each defined at least one non-cross-reactive B cell epitope. Three of the six peptides had major inhibitory effects on P. falciparum growth in ADCI assays, and the corresponding affinity-purified antibodies suppressed parasitemia in passive transfer into P. falciparum mouse model. A 70-amino acid conserved domain was identified as the primary target of biologically active antibodies.","method":"Peptide ELISA, affinity purification, ADCI assay, passive transfer in vivo in humanized mouse model","journal":"The Journal of infectious diseases","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vitro ADCI combined with in vivo passive transfer, multiple overlapping peptides tested, rigorous functional readouts","pmids":["15295710"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2005,"finding":"Recombinant full-length MSP3 forms highly elongated dimers and tetramers in solution. The dimer is formed through a leucine zipper-like domain (residues 306–362) at the C-terminus; two dimers interact through their C termini to form a tetramer (apparent association constant ~3 µM). The MSP3 polypeptides contain large amounts of alpha-helix and random coil secondary structure. The protein is highly extended in solution (f/f0 > 2).","method":"Size exclusion chromatography, circular dichroism spectroscopy, chemical cross-linking, analytical ultracentrifugation (sedimentation velocity)","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal biophysical methods (CD, cross-linking, analytical ultracentrifugation) characterizing oligomeric state and secondary structure in single rigorous study","pmids":["16135515"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2005,"finding":"A long synthetic peptide MSP3-LSP vaccine elicited predominantly cytophilic IgG antibodies in human volunteers that inhibited P. falciparum erythrocytic growth in a monocyte-dependent (ADCI) manner in vitro, comparable to natural immune adult antibodies. In vivo transfer of vaccinees' sera into P. falciparum-infected humanized SCID mice profoundly reduced or abrogated parasitemia.","method":"Phase I clinical trial immunization, ADCI assay with vaccine-induced antibodies, passive transfer into humanized SCID mouse model","journal":"PLoS medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — both in vitro functional ADCI and in vivo passive transfer model in same study, confirming mechanism of action of vaccine-induced anti-MSP3 antibodies","pmids":["16262450"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2009,"finding":"MSP3 (PF3D7_1035400) and five other proteins (MSP6, MSPDBL1, MSPDBL2, MSP7) share a common small N-terminal signature stretch (NLRNA/G). Six members of the MSP3 multi-gene family on P. falciparum chromosome 10 are simultaneously expressed as merozoite surface proteins, are highly conserved among parasite isolates, and each is targeted by naturally occurring antibodies capable of killing parasites in ADCI assays. Naturally occurring and immunization-induced antibodies showed cross-reactivity among family members.","method":"Gene expression analysis, localization assays, ADCI assay, cross-reactivity binding assays","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — ADCI and localization assays across multiple family members, single lab, multiple protein targets characterized simultaneously","pmids":["19404387"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2013,"finding":"MSP3, together with peripheral surface proteins MSP7, SERA4, and SERA5, is cleaved and shed from the merozoite surface at the tight junction between the invading merozoite and erythrocyte during P. falciparum invasion, in contrast to GPI-anchored proteins MSP2 and MSP4 which are carried into the erythrocyte without detectable processing. This sequential and coordinated cleavage indicates a diversity of functional roles during invasion.","method":"Time-resolved immunofluorescence and immunoblot analysis of merozoite surface protein processing during and after invasion","journal":"Infection and immunity","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct biochemical detection of processing timing, single lab, specific readout of cleavage at tight junction","pmids":["24218484"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2016,"finding":"MSP3 binds directly to the p83 fragment of MSP1 to form one of multiple forms of the MSP1 complex on the P. falciparum merozoite surface. MSP3, MSP6, MSPDBL1, MSPDBL2, and MSP7 each bind independently to MSP1. These complexes have overlapping functions in direct interaction with human erythrocytes. Inhibitory antibodies targeting p83 of MSP1 disrupt all MSP1 complexes (including MSP3-containing ones) and inhibit parasite growth in vitro.","method":"Co-immunoprecipitation, direct binding assays, inhibitory antibody growth inhibition assay in vitro","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal binding assays demonstrating direct MSP3-MSP1 interaction, multiple peripheral proteins tested in parallel, functional growth inhibition assay confirming complex role","pmids":["26823464"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2016,"finding":"Opsonization of transgenic P. falciparum parasites deficient for MSP3 was similar to that of wild-type parasites, indicating that MSP3 is not a dominant target of strain-transcending opsonizing antibodies in the merozoite opsonization assay.","method":"Merozoite opsonization/phagocytosis assay using MSP3-deficient transgenic parasites compared to wild-type","journal":"Infection and immunity","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — transgenic parasite experiment with defined genetic deletion, single lab, single functional assay; this is a negative result for MSP3 as a dominant opsonization target","pmids":["27185785"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2025,"finding":"PfMSP3 was identified as the binding partner of complement inhibitor C1 esterase inhibitor (C1-INH) on the P. falciparum merozoite surface. A murine monoclonal antibody targeting PfMSP3 effectively blocked C1-INH binding to the parasite surface. Cryo-electron microscopy provided the first low-resolution structural data for PfMSP3 in complex with this monoclonal antibody.","method":"Monoclonal antibody blocking assay, cryo-electron microscopy, complement deposition assays","journal":"PLoS pathogens","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — cryo-EM structural data (low resolution) plus functional blocking assay, single lab, novel interaction identified for C1-INH binding to MSP3","pmids":["40294075"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"current_model":"PF3D7_1035400 (MSP3) is a secreted, soluble P. falciparum merozoite surface protein that lacks a transmembrane domain or GPI anchor; it forms highly elongated dimers and tetramers via a C-terminal leucine zipper-like domain, associates with the merozoite surface through binding to the p83 fragment of MSP1 (one of multiple independent MSP1 complexes), requires its leucine zipper domain for trafficking itself and ABRA to the parasitophorous vacuole and merozoite surface, is shed at the tight junction during erythrocyte invasion, serves as the merozoite surface binding partner for the complement regulator C1-INH, and is the target of cytophilic (IgG1/IgG3) antibodies that mediate monocyte-dependent parasite killing via antibody-dependent cellular inhibition (ADCI) both in vitro and in vivo."},"narrative":{"mechanistic_narrative":"MSP3 (PF3D7_1035400) is a secreted, polymorphic merozoite surface protein of Plasmodium falciparum that lacks a membrane anchor and associates peripherally with the merozoite surface, where it functions both in erythrocyte invasion and as a major target of protective, monocyte-dependent antibody responses [PMID:8068948, PMID:9497029]. The protein is highly elongated in solution and self-assembles into dimers and tetramers through a C-terminal leucine zipper-like domain (residues 306–362), giving it substantial alpha-helical and random-coil character [PMID:16135515]; its N-terminal half carries a domain of alanine-rich heptad repeats (consensus AXXAXXX) that is the principal site of antigenic polymorphism [PMID:9497029]. The C-terminal leucine zipper is required for correct trafficking of MSP3 itself and of ABRA to the parasitophorous vacuole and merozoite surface, and loss of both proteins from the surface reduces erythrocyte invasion [PMID:11952894]. MSP3 attaches to the merozoite surface by binding directly to the p83 fragment of MSP1, forming one of several independent MSP1 peripheral-protein complexes that interact with human erythrocytes, and it is proteolytically cleaved and shed at the tight junction during invasion [PMID:24218484, PMID:26823464]. On the surface it also serves as the binding partner for the host complement regulator C1 esterase inhibitor (C1-INH) [PMID:40294075]. Functionally, cytophilic (IgG1/IgG3) antibodies against a conserved C-terminal ~70-amino-acid domain of MSP3 mediate antibody-dependent cellular inhibition (ADCI) in cooperation with blood monocytes, killing parasites in vitro and suppressing parasitemia after passive transfer into P. falciparum-infected humanized mice, a mechanism reproduced by a long synthetic peptide vaccine [PMID:8068948, PMID:11104807, PMID:15295710, PMID:16262450].","teleology":[{"year":1994,"claim":"Establishing that MSP3 is a surface antigen whose antibodies kill parasites answered whether it is a functionally relevant immune target rather than an incidental merozoite protein.","evidence":"ADCI assays with purified human immune IgG and mouse anti-peptide antibodies against a 48 kDa merozoite surface protein","pmids":["8068948","7565137"],"confidence":"High","gaps":["Molecular basis of surface attachment not defined","Effector mechanism of monocyte cooperation not resolved in vivo"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1997,"claim":"Sequencing and antisera mapping defined MSP3's domain architecture and localized antigenic diversity, distinguishing conserved from polymorphic regions relevant to vaccine design.","evidence":"Gene sequencing of multiple isolates plus recombinant protein and synthetic peptide antisera reactivity","pmids":["9497029"],"confidence":"Medium","gaps":["Functional consequence of heptad-repeat polymorphism unknown","Structure inferred, not experimentally determined"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2000,"claim":"Passive transfer into humanized mice demonstrated that anti-MSP3 protection is monocyte-dependent in vivo, converting the in vitro ADCI observation into a defined mechanism of action.","evidence":"Passive transfer of affinity-purified human anti-MSP3 antibodies into P. falciparum-infected immunodeficient mice reconstituted with human monocytes","pmids":["11104807"],"confidence":"High","gaps":["Precise monocyte effector molecules not identified","Strain-transcending breadth not tested"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2002,"claim":"Genetic truncation revealed a trafficking role for the C-terminal leucine zipper, showing MSP3 governs surface delivery of itself and ABRA and contributes to invasion.","evidence":"Homologous-recombination truncation, immunolocalization, and erythrocyte invasion assays","pmids":["11952894"],"confidence":"High","gaps":["Mechanism of leucine-zipper-mediated trafficking unresolved","Whether invasion defect is direct or via ABRA loss not separated"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2004,"claim":"Fine epitope mapping localized the protective antibody response to a conserved ~70-residue C-terminal domain, defining the biologically active target for vaccine focusing.","evidence":"Overlapping peptide ELISA, affinity purification, ADCI, and passive transfer in humanized mice","pmids":["15295710"],"confidence":"High","gaps":["Structural basis of protective epitopes not defined","Relative contribution of individual epitopes not quantified"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2005,"claim":"Biophysical characterization explained how the anchorless protein self-associates, showing leucine-zipper-driven dimer and tetramer formation of a highly extended molecule.","evidence":"Size exclusion chromatography, circular dichroism, chemical cross-linking, and analytical ultracentrifugation","pmids":["16135515"],"confidence":"High","gaps":["No high-resolution structure","Functional role of oligomerization on the merozoite surface not established"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2005,"claim":"A Phase I long-synthetic-peptide vaccine trial showed MSP3 immunization elicits cytophilic, monocyte-dependent protective antibodies, validating the antigen for vaccine development.","evidence":"Phase I immunization, ADCI with vaccine-induced antibodies, and passive transfer into humanized SCID mice","pmids":["16262450"],"confidence":"High","gaps":["Efficacy against natural challenge not demonstrated here","Durability and strain coverage not addressed"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2009,"claim":"Placing MSP3 within a co-expressed multi-gene family with a shared N-terminal signature contextualized it among sibling surface antigens with cross-reactive ADCI activity.","evidence":"Expression, localization, ADCI, and cross-reactivity assays across MSP3-family members","pmids":["19404387"],"confidence":"Medium","gaps":["Functional redundancy between family members not tested by genetics","MSP3-specific versus cross-reactive contributions not separated"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2013,"claim":"Time-resolved processing analysis showed MSP3 is cleaved and shed at the tight junction during invasion, distinguishing it functionally from GPI-anchored surface proteins carried into the erythrocyte.","evidence":"Time-resolved immunofluorescence and immunoblot of surface-protein processing during invasion","pmids":["24218484"],"confidence":"Medium","gaps":["Protease responsible for cleavage not identified","Functional consequence of shedding not tested"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2016,"claim":"Binding assays established the molecular basis of MSP3 surface attachment, showing direct binding to the MSP1 p83 fragment as one of several independent MSP1 complexes engaging erythrocytes.","evidence":"Co-immunoprecipitation, direct binding assays, and inhibitory-antibody growth inhibition in vitro","pmids":["26823464"],"confidence":"High","gaps":["Binding interface on MSP3 not mapped","Individual complex contributions to invasion not dissected"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2016,"claim":"A deletion-parasite opsonization test showed MSP3 is not a dominant target of strain-transcending opsonizing antibodies, bounding its role in phagocytic immunity relative to its ADCI role.","evidence":"Merozoite opsonization/phagocytosis assay with MSP3-deficient versus wild-type transgenic parasites","pmids":["27185785"],"confidence":"Medium","gaps":["Negative result; does not exclude a minor opsonization contribution","Single assay in single lab"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2025,"claim":"Identifying MSP3 as the merozoite-surface partner of complement inhibitor C1-INH revealed a host-immune-evasion role and provided first structural data on the complex.","evidence":"Monoclonal antibody blocking, cryo-electron microscopy (low resolution), and complement deposition assays","pmids":["40294075"],"confidence":"Medium","gaps":["Only low-resolution structure available","Physiological impact of C1-INH recruitment on complement evasion not quantified in vivo"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":null,"claim":"How MSP3's oligomerization, MSP1-p83 binding, tight-junction shedding, and C1-INH recruitment mechanistically coordinate during a single invasion event, and the identity of the shedding protease, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No high-resolution structure of MSP3 or its complexes","Shedding protease unidentified","Causal link between C1-INH recruitment and in vivo complement evasion untested"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":["MSP1 peripheral-protein complex (MSP3 bound to MSP1 p83 fragment) [#10]","MSP3–C1-INH surface complex [#12]"],"partners":["MSP1 (P83 FRAGMENT) [#10]","ABRA (TRAFFICKING-DEPENDENT CO-LOCALIZATION) [#4]","C1 ESTERASE INHIBITOR / C1-INH (HOST COMPLEMENT REGULATOR) [#12]"],"other_free_text":["Forms elongated dimers and tetramers via a C-terminal leucine zipper-like domain (residues 306–362); tetramer association constant ~3 µM [#6]","N-terminal alanine heptad-repeat domain (consensus AXXAXXX) is the main site of antigenic polymorphism [#2]","Conserved C-terminal ~70-residue domain is the primary target of ADCI-active cytophilic (IgG1/IgG3) antibodies [#5]","Cleaved and shed at the tight junction during erythrocyte invasion [#9]","Member of a co-expressed chromosome 10 MSP3 multi-gene family sharing an N-terminal NLRNA/G signature; note this places MSP3 among cross-reactive sibling antigens (MSP6, MSPDBL1, MSPDBL2, MSP7) — findings must remain attributed to PF3D7_1035400 [#8]","Not a dominant target of strain-transcending opsonizing antibodies [#11]","Low-resolution cryo-EM structure available only in complex with a monoclonal antibody [#12]"]}},"prefetch_data":{},"corpus_meta":[{"pmid":"18316390","id":"PMC_18316390","title":"Breadth and magnitude of antibody responses to multiple Plasmodium falciparum merozoite antigens are associated with protection from clinical malaria.","date":"2008","source":"Infection and immunity","url":"https://pubmed.ncbi.nlm.nih.gov/18316390","citation_count":324,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["MSP3"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"20098724","id":"PMC_20098724","title":"The relationship between anti-merozoite antibodies and incidence of Plasmodium falciparum malaria: A systematic review and meta-analysis.","date":"2010","source":"PLoS 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inhibition (ADCI) assay. Cytophilic antibodies from clinically protected individuals directed against MSP3 promoted monocyte-dependent inhibition of P. falciparum erythrocytic growth, whereas non-cytophilic antibodies from non-protected individuals did not.\",\n      \"method\": \"ADCI assay, purified IgG from immune and non-immune subjects, immunopurification on recombinant protein and synthetic peptides, mouse immunization\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — functional ADCI assay with purified antibodies, replicated with both human immune IgG and mouse antibodies raised against peptides, multiple orthogonal approaches in a single study\",\n      \"pmids\": [\"8068948\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"MSP3 is located on the surface of P. falciparum merozoites, detectable in all isolates tested, and contains B and T cell epitopes recognized by individuals living in endemic areas. Human antibodies purified on recombinant MSP3 or the synthetic peptide MSP-3b, as well as mouse antibodies, all promoted monocyte-mediated parasite killing in ADCI.\",\n      \"method\": \"ADCI assay, immunopurification on recombinant protein and synthetic peptide, mouse immunization, epidemiological peptide mapping\",\n      \"journal\": \"Memorias do Instituto Oswaldo Cruz\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ADCI functional assay, single lab, multiple antibody reagents confirming surface localization and ADCI activity\",\n      \"pmids\": [\"7565137\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"MSP3 is a secreted polymorphic antigen associated with erythrocytic schizonts and merozoites. Its prominent structural feature is a domain of three blocks of tandemly-repeated heptads with consensus AXXAXXX predicted to form alpha-helical secondary structure. Polymorphism is predominantly in the N-terminal half within and flanking the heptad-repeats. Antisera to conserved and variable regions identified the alanine heptad-repeat domain as a site of antigenic diversity using recombinant proteins and synthetic peptides.\",\n      \"method\": \"Gene sequencing of 4 isolates, recombinant protein production, synthetic peptide antisera, differential antibody reactivity assays\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — structural/sequence analysis combined with recombinant protein antisera reactivity, single lab, two orthogonal approaches\",\n      \"pmids\": [\"9497029\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Anti-MSP3 antibodies affinity-purified on synthetic MSP3 peptides, when passively transferred into P. falciparum-infected humanized SCID mice reconstituted with human monocytes, consistently suppressed P. falciparum parasitemia. This suppression required concomitant human monocyte reconstitution; neither antibodies nor monocytes alone had direct effect, demonstrating the monocyte-dependent in vivo mechanism of MSP3-specific antibodies.\",\n      \"method\": \"Passive transfer of affinity-purified human anti-MSP3 antibodies into P. falciparum-infected immunodeficient mice reconstituted with human monocytes\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo passive transfer model with defined cell reconstitution, multiple controls, and direct comparison to hyperimmune IgG\",\n      \"pmids\": [\"11104807\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Truncation of MSP3 by homologous recombination (removing the putative leucine zipper sequence at the C-terminus while retaining the glutamic acid-rich region and heptad repeats) prevented MSP3 from localizing to the parasitophorous vacuole or the merozoite surface. Furthermore, the acidic-basic repeat antigen (ABRA) also failed to localize to the merozoite surface in these truncated-MSP3 parasites, indicating that the leucine zipper region of MSP3 is required for trafficking of both MSP3 and ABRA. Merozoites lacking both MSP3 and ABRA on their surface showed reduced erythrocyte invasion.\",\n      \"method\": \"Homologous recombination gene disruption in P. falciparum, immunofluorescence/localization assays, erythrocyte invasion assays\",\n      \"journal\": \"Molecular microbiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic disruption with defined truncation, functional localization readout, invasion assay, multiple phenotypic consequences characterized in single study\",\n      \"pmids\": [\"11952894\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Six overlapping peptides spanning the C-terminal conserved half of MSP3 each defined at least one non-cross-reactive B cell epitope. Three of the six peptides had major inhibitory effects on P. falciparum growth in ADCI assays, and the corresponding affinity-purified antibodies suppressed parasitemia in passive transfer into P. falciparum mouse model. A 70-amino acid conserved domain was identified as the primary target of biologically active antibodies.\",\n      \"method\": \"Peptide ELISA, affinity purification, ADCI assay, passive transfer in vivo in humanized mouse model\",\n      \"journal\": \"The Journal of infectious diseases\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vitro ADCI combined with in vivo passive transfer, multiple overlapping peptides tested, rigorous functional readouts\",\n      \"pmids\": [\"15295710\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Recombinant full-length MSP3 forms highly elongated dimers and tetramers in solution. The dimer is formed through a leucine zipper-like domain (residues 306–362) at the C-terminus; two dimers interact through their C termini to form a tetramer (apparent association constant ~3 µM). The MSP3 polypeptides contain large amounts of alpha-helix and random coil secondary structure. The protein is highly extended in solution (f/f0 > 2).\",\n      \"method\": \"Size exclusion chromatography, circular dichroism spectroscopy, chemical cross-linking, analytical ultracentrifugation (sedimentation velocity)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal biophysical methods (CD, cross-linking, analytical ultracentrifugation) characterizing oligomeric state and secondary structure in single rigorous study\",\n      \"pmids\": [\"16135515\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"A long synthetic peptide MSP3-LSP vaccine elicited predominantly cytophilic IgG antibodies in human volunteers that inhibited P. falciparum erythrocytic growth in a monocyte-dependent (ADCI) manner in vitro, comparable to natural immune adult antibodies. In vivo transfer of vaccinees' sera into P. falciparum-infected humanized SCID mice profoundly reduced or abrogated parasitemia.\",\n      \"method\": \"Phase I clinical trial immunization, ADCI assay with vaccine-induced antibodies, passive transfer into humanized SCID mouse model\",\n      \"journal\": \"PLoS medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — both in vitro functional ADCI and in vivo passive transfer model in same study, confirming mechanism of action of vaccine-induced anti-MSP3 antibodies\",\n      \"pmids\": [\"16262450\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"MSP3 (PF3D7_1035400) and five other proteins (MSP6, MSPDBL1, MSPDBL2, MSP7) share a common small N-terminal signature stretch (NLRNA/G). Six members of the MSP3 multi-gene family on P. falciparum chromosome 10 are simultaneously expressed as merozoite surface proteins, are highly conserved among parasite isolates, and each is targeted by naturally occurring antibodies capable of killing parasites in ADCI assays. Naturally occurring and immunization-induced antibodies showed cross-reactivity among family members.\",\n      \"method\": \"Gene expression analysis, localization assays, ADCI assay, cross-reactivity binding assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — ADCI and localization assays across multiple family members, single lab, multiple protein targets characterized simultaneously\",\n      \"pmids\": [\"19404387\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"MSP3, together with peripheral surface proteins MSP7, SERA4, and SERA5, is cleaved and shed from the merozoite surface at the tight junction between the invading merozoite and erythrocyte during P. falciparum invasion, in contrast to GPI-anchored proteins MSP2 and MSP4 which are carried into the erythrocyte without detectable processing. This sequential and coordinated cleavage indicates a diversity of functional roles during invasion.\",\n      \"method\": \"Time-resolved immunofluorescence and immunoblot analysis of merozoite surface protein processing during and after invasion\",\n      \"journal\": \"Infection and immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct biochemical detection of processing timing, single lab, specific readout of cleavage at tight junction\",\n      \"pmids\": [\"24218484\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MSP3 binds directly to the p83 fragment of MSP1 to form one of multiple forms of the MSP1 complex on the P. falciparum merozoite surface. MSP3, MSP6, MSPDBL1, MSPDBL2, and MSP7 each bind independently to MSP1. These complexes have overlapping functions in direct interaction with human erythrocytes. Inhibitory antibodies targeting p83 of MSP1 disrupt all MSP1 complexes (including MSP3-containing ones) and inhibit parasite growth in vitro.\",\n      \"method\": \"Co-immunoprecipitation, direct binding assays, inhibitory antibody growth inhibition assay in vitro\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal binding assays demonstrating direct MSP3-MSP1 interaction, multiple peripheral proteins tested in parallel, functional growth inhibition assay confirming complex role\",\n      \"pmids\": [\"26823464\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Opsonization of transgenic P. falciparum parasites deficient for MSP3 was similar to that of wild-type parasites, indicating that MSP3 is not a dominant target of strain-transcending opsonizing antibodies in the merozoite opsonization assay.\",\n      \"method\": \"Merozoite opsonization/phagocytosis assay using MSP3-deficient transgenic parasites compared to wild-type\",\n      \"journal\": \"Infection and immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — transgenic parasite experiment with defined genetic deletion, single lab, single functional assay; this is a negative result for MSP3 as a dominant opsonization target\",\n      \"pmids\": [\"27185785\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PfMSP3 was identified as the binding partner of complement inhibitor C1 esterase inhibitor (C1-INH) on the P. falciparum merozoite surface. A murine monoclonal antibody targeting PfMSP3 effectively blocked C1-INH binding to the parasite surface. Cryo-electron microscopy provided the first low-resolution structural data for PfMSP3 in complex with this monoclonal antibody.\",\n      \"method\": \"Monoclonal antibody blocking assay, cryo-electron microscopy, complement deposition assays\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — cryo-EM structural data (low resolution) plus functional blocking assay, single lab, novel interaction identified for C1-INH binding to MSP3\",\n      \"pmids\": [\"40294075\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"current_model\": \"PF3D7_1035400 (MSP3) is a secreted, soluble P. falciparum merozoite surface protein that lacks a transmembrane domain or GPI anchor; it forms highly elongated dimers and tetramers via a C-terminal leucine zipper-like domain, associates with the merozoite surface through binding to the p83 fragment of MSP1 (one of multiple independent MSP1 complexes), requires its leucine zipper domain for trafficking itself and ABRA to the parasitophorous vacuole and merozoite surface, is shed at the tight junction during erythrocyte invasion, serves as the merozoite surface binding partner for the complement regulator C1-INH, and is the target of cytophilic (IgG1/IgG3) antibodies that mediate monocyte-dependent parasite killing via antibody-dependent cellular inhibition (ADCI) both in vitro and in vivo.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"MSP3 (PF3D7_1035400) is a secreted, polymorphic merozoite surface protein of Plasmodium falciparum that lacks a membrane anchor and associates peripherally with the merozoite surface, where it functions both in erythrocyte invasion and as a major target of protective, monocyte-dependent antibody responses [#0, #2]. The protein is highly elongated in solution and self-assembles into dimers and tetramers through a C-terminal leucine zipper-like domain (residues 306–362), giving it substantial alpha-helical and random-coil character [#6]; its N-terminal half carries a domain of alanine-rich heptad repeats (consensus AXXAXXX) that is the principal site of antigenic polymorphism [#2]. The C-terminal leucine zipper is required for correct trafficking of MSP3 itself and of ABRA to the parasitophorous vacuole and merozoite surface, and loss of both proteins from the surface reduces erythrocyte invasion [#4]. MSP3 attaches to the merozoite surface by binding directly to the p83 fragment of MSP1, forming one of several independent MSP1 peripheral-protein complexes that interact with human erythrocytes, and it is proteolytically cleaved and shed at the tight junction during invasion [#9, #10]. On the surface it also serves as the binding partner for the host complement regulator C1 esterase inhibitor (C1-INH) [#12]. Functionally, cytophilic (IgG1/IgG3) antibodies against a conserved C-terminal ~70-amino-acid domain of MSP3 mediate antibody-dependent cellular inhibition (ADCI) in cooperation with blood monocytes, killing parasites in vitro and suppressing parasitemia after passive transfer into P. falciparum-infected humanized mice, a mechanism reproduced by a long synthetic peptide vaccine [#0, #3, #5, #7].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Establishing that MSP3 is a surface antigen whose antibodies kill parasites answered whether it is a functionally relevant immune target rather than an incidental merozoite protein.\",\n      \"evidence\": \"ADCI assays with purified human immune IgG and mouse anti-peptide antibodies against a 48 kDa merozoite surface protein\",\n      \"pmids\": [\"8068948\", \"7565137\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of surface attachment not defined\", \"Effector mechanism of monocyte cooperation not resolved in vivo\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Sequencing and antisera mapping defined MSP3's domain architecture and localized antigenic diversity, distinguishing conserved from polymorphic regions relevant to vaccine design.\",\n      \"evidence\": \"Gene sequencing of multiple isolates plus recombinant protein and synthetic peptide antisera reactivity\",\n      \"pmids\": [\"9497029\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of heptad-repeat polymorphism unknown\", \"Structure inferred, not experimentally determined\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Passive transfer into humanized mice demonstrated that anti-MSP3 protection is monocyte-dependent in vivo, converting the in vitro ADCI observation into a defined mechanism of action.\",\n      \"evidence\": \"Passive transfer of affinity-purified human anti-MSP3 antibodies into P. falciparum-infected immunodeficient mice reconstituted with human monocytes\",\n      \"pmids\": [\"11104807\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise monocyte effector molecules not identified\", \"Strain-transcending breadth not tested\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Genetic truncation revealed a trafficking role for the C-terminal leucine zipper, showing MSP3 governs surface delivery of itself and ABRA and contributes to invasion.\",\n      \"evidence\": \"Homologous-recombination truncation, immunolocalization, and erythrocyte invasion assays\",\n      \"pmids\": [\"11952894\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of leucine-zipper-mediated trafficking unresolved\", \"Whether invasion defect is direct or via ABRA loss not separated\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Fine epitope mapping localized the protective antibody response to a conserved ~70-residue C-terminal domain, defining the biologically active target for vaccine focusing.\",\n      \"evidence\": \"Overlapping peptide ELISA, affinity purification, ADCI, and passive transfer in humanized mice\",\n      \"pmids\": [\"15295710\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of protective epitopes not defined\", \"Relative contribution of individual epitopes not quantified\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Biophysical characterization explained how the anchorless protein self-associates, showing leucine-zipper-driven dimer and tetramer formation of a highly extended molecule.\",\n      \"evidence\": \"Size exclusion chromatography, circular dichroism, chemical cross-linking, and analytical ultracentrifugation\",\n      \"pmids\": [\"16135515\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No high-resolution structure\", \"Functional role of oligomerization on the merozoite surface not established\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"A Phase I long-synthetic-peptide vaccine trial showed MSP3 immunization elicits cytophilic, monocyte-dependent protective antibodies, validating the antigen for vaccine development.\",\n      \"evidence\": \"Phase I immunization, ADCI with vaccine-induced antibodies, and passive transfer into humanized SCID mice\",\n      \"pmids\": [\"16262450\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Efficacy against natural challenge not demonstrated here\", \"Durability and strain coverage not addressed\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Placing MSP3 within a co-expressed multi-gene family with a shared N-terminal signature contextualized it among sibling surface antigens with cross-reactive ADCI activity.\",\n      \"evidence\": \"Expression, localization, ADCI, and cross-reactivity assays across MSP3-family members\",\n      \"pmids\": [\"19404387\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional redundancy between family members not tested by genetics\", \"MSP3-specific versus cross-reactive contributions not separated\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Time-resolved processing analysis showed MSP3 is cleaved and shed at the tight junction during invasion, distinguishing it functionally from GPI-anchored surface proteins carried into the erythrocyte.\",\n      \"evidence\": \"Time-resolved immunofluorescence and immunoblot of surface-protein processing during invasion\",\n      \"pmids\": [\"24218484\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Protease responsible for cleavage not identified\", \"Functional consequence of shedding not tested\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Binding assays established the molecular basis of MSP3 surface attachment, showing direct binding to the MSP1 p83 fragment as one of several independent MSP1 complexes engaging erythrocytes.\",\n      \"evidence\": \"Co-immunoprecipitation, direct binding assays, and inhibitory-antibody growth inhibition in vitro\",\n      \"pmids\": [\"26823464\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Binding interface on MSP3 not mapped\", \"Individual complex contributions to invasion not dissected\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"A deletion-parasite opsonization test showed MSP3 is not a dominant target of strain-transcending opsonizing antibodies, bounding its role in phagocytic immunity relative to its ADCI role.\",\n      \"evidence\": \"Merozoite opsonization/phagocytosis assay with MSP3-deficient versus wild-type transgenic parasites\",\n      \"pmids\": [\"27185785\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Negative result; does not exclude a minor opsonization contribution\", \"Single assay in single lab\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identifying MSP3 as the merozoite-surface partner of complement inhibitor C1-INH revealed a host-immune-evasion role and provided first structural data on the complex.\",\n      \"evidence\": \"Monoclonal antibody blocking, cryo-electron microscopy (low resolution), and complement deposition assays\",\n      \"pmids\": [\"40294075\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Only low-resolution structure available\", \"Physiological impact of C1-INH recruitment on complement evasion not quantified in vivo\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How MSP3's oligomerization, MSP1-p83 binding, tight-junction shedding, and C1-INH recruitment mechanistically coordinate during a single invasion event, and the identity of the shedding protease, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No high-resolution structure of MSP3 or its complexes\", \"Shedding protease unidentified\", \"Causal link between C1-INH recruitment and in vivo complement evasion untested\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0042803\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"GO:0005102\", \"supporting_discovery_ids\": [10, 12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0009986\", \"supporting_discovery_ids\": [0, 1, 4, 10]},\n      {\"term_id\": \"GO:0020002\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0044409\", \"supporting_discovery_ids\": [4, 9, 10]}\n    ],\n    \"complexes\": [\n      \"MSP1 peripheral-protein complex (MSP3 bound to MSP1 p83 fragment) [#10]\",\n      \"MSP3–C1-INH surface complex [#12]\"\n    ],\n    \"partners\": [\n      \"MSP1 (p83 fragment) [#10]\",\n      \"ABRA (trafficking-dependent co-localization) [#4]\",\n      \"C1 esterase inhibitor / C1-INH (host complement regulator) [#12]\"\n    ],\n    \"other_free_text\": [\n      \"Forms elongated dimers and tetramers via a C-terminal leucine zipper-like domain (residues 306–362); tetramer association constant ~3 µM [#6]\",\n      \"N-terminal alanine heptad-repeat domain (consensus AXXAXXX) is the main site of antigenic polymorphism [#2]\",\n      \"Conserved C-terminal ~70-residue domain is the primary target of ADCI-active cytophilic (IgG1/IgG3) antibodies [#5]\",\n      \"Cleaved and shed at the tight junction during erythrocyte invasion [#9]\",\n      \"Member of a co-expressed chromosome 10 MSP3 multi-gene family sharing an N-terminal NLRNA/G signature; note this places MSP3 among cross-reactive sibling antigens (MSP6, MSPDBL1, MSPDBL2, MSP7) — findings must remain attributed to PF3D7_1035400 [#8]\",\n      \"Not a dominant target of strain-transcending opsonizing antibodies [#11]\",\n      \"Low-resolution cryo-EM structure available only in complex with a monoclonal antibody [#12]\"\n    ]\n  }\n}","audit_flag":null,"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_1035400","name":null,"product":"merozoite surface protein 3","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_1457400","name":null,"product":"merozoite surface protein 3, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"MSP3","evaluation":null}