{"gene":"PF3D7_0828800","run_date":"2026-09-08T12:51:27","timeline":{"discoveries":[{"year":2009,"finding":"GAMA (PF3D7_0828800) is a novel P. falciparum erythrocyte binding protein localized to the micronemes of the merozoite stage. The protein is synthesized late during schizogony, processed into two disulfide-linked fragments, translocated to an apical location (micronemes), and in a proportion of free merozoites can be detected on the parasite surface. Following erythrocyte invasion, the bulk of the protein is shed in soluble form. GAMA binds reversibly to erythrocytes, representing a new host cell binding protein.","method":"Selection criteria-based bioinformatics identification, immunoelectron microscopy, immunofluorescence assay, erythrocyte binding assay, biochemical characterization (disulfide bond analysis, processing analysis by Western blot)","journal":"Eukaryotic cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization by immunoelectron microscopy, erythrocyte binding assay, and biochemical processing analysis in single lab with multiple orthogonal methods","pmids":["19820120"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2011,"finding":"GAMA (PF3D7_0828800, referred to as PF08_0008) is a microneme protein of the P. falciparum merozoite confirmed by immunoelectron microscopy. GAMA possesses an erythrocyte binding epitope in its C-terminal region and binds a nonsialylated protein receptor on human erythrocytes. Anti-GAMA antibodies inhibit P. falciparum invasion in a dose-dependent manner, and GAMA plays a role in the sialic acid-independent invasion pathway. The pfgama gene is refractory to knockout attempts, indicating it is essential to parasite invasion.","method":"Immunoelectron microscopy, erythrocyte binding assay with C-terminal region recombinant protein, growth inhibition assay (GIA), attempted gene knockout (refractory), wheat germ cell-free expression of recombinant protein","journal":"Infection and immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (immunoelectron microscopy, erythrocyte binding assay, GIA, gene knockout attempt) in a single focused study, corroborated by the earlier Hinds et al. 2009 paper","pmids":["21896773"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2016,"finding":"P. vivax GAMA (PvGAMA), the ortholog of PF3D7_0828800, localizes to micronemes in mature schizont-stage parasites and binds human erythrocytes regardless of Duffy antigen status. Erythrocyte binding activity of PvGAMA is significantly reduced by chymotrypsin treatment, indicating dependence on a chymotrypsin-sensitive receptor. Antibodies against PvGAMA fragments inhibit PvGAMA binding to erythrocytes in a dose-dependent manner.","method":"Immunofluorescence localization, erythrocyte binding assay with enzyme treatment (chymotrypsin, trypsin, neuraminidase), antibody inhibition assay","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization, receptor enzyme treatment assay, and antibody inhibition in single lab with multiple orthogonal methods, but in P. vivax ortholog only","pmids":["27759110"],"is_preprint":false,"attribution":[{"species":"Plasmodium vivax","strain":""}]},{"year":2016,"finding":"Recombinant PfGAMA (PF3D7_0828800) antibodies raised against the 3D7-based sequence inhibit merozoite invasion in the homologous 3D7 strain in vitro (GIA activity demonstrated), but not in the heterologous FVO strain, indicating strain-specific functional inhibition consistent with genetic diversity/polymorphism of pfgama.","method":"Growth inhibition assay (GIA) with rabbit antibodies against wheat germ cell-free expressed recombinant protein, using both 3D7 and FVO strains","journal":"Vaccine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional GIA in two strains, single lab, demonstrates invasion inhibition and strain-specificity","pmids":["27692771"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":"3D7"}]}],"current_model":"GAMA (PF3D7_0828800) is a GPI-anchored microneme protein of the P. falciparum merozoite that is synthesized late in schizogony, processed into two disulfide-linked fragments, and localized to apical micronemes; it binds a nonsialylated protein receptor on human erythrocytes via its C-terminal region, participates in the sialic acid-independent invasion pathway, and is essential for erythrocyte invasion as its gene is refractory to knockout."},"narrative":{"mechanistic_narrative":"GAMA (PF3D7_0828800) is a GPI-anchored micronemal antigen of the Plasmodium falciparum merozoite that functions as an erythrocyte-binding protein during host cell invasion [PMID:19820120, PMID:21896773]. It is synthesized late in schizogony, processed into two disulfide-linked fragments, and translocated to apical micronemes, with a proportion detectable on the surface of free merozoites before the bulk of the protein is shed in soluble form after invasion [PMID:19820120]. GAMA binds human erythrocytes reversibly through an epitope in its C-terminal region, engaging a nonsialylated protein receptor, and thereby contributes to the sialic acid-independent invasion pathway [PMID:19820120, PMID:21896773]. Anti-GAMA antibodies inhibit invasion dose-dependently, and the pfgama gene is refractory to knockout, indicating an essential role in invasion; inhibition by antibodies raised against the 3D7 sequence is strain-specific, blocking the homologous 3D7 strain but not the heterologous FVO strain, consistent with genetic polymorphism [PMID:21896773, PMID:27692771]. In the P. vivax ortholog PvGAMA, micronemal localization and Duffy-independent erythrocyte binding via a chymotrypsin-sensitive receptor are conserved [PMID:27759110]. The identity of the erythrocyte receptor and the structural basis of binding have not been characterized in the available corpus.","teleology":[{"year":2009,"claim":"Establishing that GAMA is a micronemal, processed erythrocyte-binding protein defined it as a candidate invasion ligand rather than an uncharacterized ORF.","evidence":"Bioinformatic identification with immunoelectron microscopy, immunofluorescence, erythrocyte binding assay, and biochemical processing analysis in P. falciparum","pmids":["19820120"],"confidence":"Medium","gaps":["Receptor identity on the erythrocyte not determined","Functional requirement in invasion not tested","Binding region within GAMA not mapped"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2011,"claim":"Mapping the binding activity to the C-terminal region, showing a nonsialylated protein receptor, and finding the gene refractory to knockout established GAMA as an essential ligand of the sialic acid-independent invasion pathway.","evidence":"Immunoelectron microscopy, C-terminal recombinant erythrocyte binding assay, growth inhibition assay, and attempted gene knockout in P. falciparum","pmids":["21896773"],"confidence":"High","gaps":["Molecular identity of the nonsialylated receptor not established","Refractory knockout does not distinguish essentiality of invasion function from other roles","No structural basis for C-terminal binding"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2016,"claim":"Characterization of the P. vivax ortholog showed micronemal localization and Duffy-independent binding via a chymotrypsin-sensitive receptor are conserved features of the GAMA family.","evidence":"Immunofluorescence, erythrocyte binding with enzyme treatment (chymotrypsin/trypsin/neuraminidase), and antibody inhibition in P. vivax","pmids":["27759110"],"confidence":"Medium","gaps":["Finding is in the P. vivax ortholog, not PF3D7_0828800 itself","Receptor not molecularly identified","Requirement of PvGAMA for invasion not shown"],"attribution":[{"species":"Plasmodium vivax","strain":""}]},{"year":2016,"claim":"Demonstrating strain-specific invasion inhibition connected GAMA sequence polymorphism to functional antibody escape, a key consideration for vaccine candidacy.","evidence":"Growth inhibition assay with anti-3D7 recombinant GAMA antibodies against homologous 3D7 and heterologous FVO strains of P. falciparum","pmids":["27692771"],"confidence":"Medium","gaps":["Polymorphic residues responsible for strain-specificity not identified","Breadth across additional strains not assessed","In vivo protective relevance untested"],"attribution":[{"species":"Plasmodium falciparum","strain":"3D7"}]},{"year":null,"claim":"The molecular identity of the nonsialylated erythrocyte receptor for GAMA and the structural basis of its C-terminal binding remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["Erythrocyte receptor not identified","No structure of the GAMA C-terminal binding region or its receptor complex","Role of GAMA processing and shedding in invasion mechanics unknown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":[],"partners":[],"other_free_text":["Binds a nonsialylated, chymotrypsin-sensitive protein receptor on human erythrocytes via its C-terminal region [#1, #2]","Processed into two disulfide-linked fragments and shed in soluble form after invasion [#0]","pfgama gene refractory to knockout, indicating essentiality for invasion [#1]","Anti-GAMA antibodies inhibit invasion dose-dependently and in a strain-specific manner (3D7 vs FVO) [#1, #3]"]}},"prefetch_data":{},"corpus_meta":[{"pmid":"8418196","id":"PMC_8418196","title":"Signal transduction in host cells by a glycosylphosphatidylinositol toxin of malaria parasites.","date":"1993","source":"The Journal of experimental 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The protein is synthesized late during schizogony, processed into two disulfide-linked fragments, translocated to an apical location (micronemes), and in a proportion of free merozoites can be detected on the parasite surface. Following erythrocyte invasion, the bulk of the protein is shed in soluble form. GAMA binds reversibly to erythrocytes, representing a new host cell binding protein.\",\n      \"method\": \"Selection criteria-based bioinformatics identification, immunoelectron microscopy, immunofluorescence assay, erythrocyte binding assay, biochemical characterization (disulfide bond analysis, processing analysis by Western blot)\",\n      \"journal\": \"Eukaryotic cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization by immunoelectron microscopy, erythrocyte binding assay, and biochemical processing analysis in single lab with multiple orthogonal methods\",\n      \"pmids\": [\"19820120\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"GAMA (PF3D7_0828800, referred to as PF08_0008) is a microneme protein of the P. falciparum merozoite confirmed by immunoelectron microscopy. GAMA possesses an erythrocyte binding epitope in its C-terminal region and binds a nonsialylated protein receptor on human erythrocytes. Anti-GAMA antibodies inhibit P. falciparum invasion in a dose-dependent manner, and GAMA plays a role in the sialic acid-independent invasion pathway. The pfgama gene is refractory to knockout attempts, indicating it is essential to parasite invasion.\",\n      \"method\": \"Immunoelectron microscopy, erythrocyte binding assay with C-terminal region recombinant protein, growth inhibition assay (GIA), attempted gene knockout (refractory), wheat germ cell-free expression of recombinant protein\",\n      \"journal\": \"Infection and immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (immunoelectron microscopy, erythrocyte binding assay, GIA, gene knockout attempt) in a single focused study, corroborated by the earlier Hinds et al. 2009 paper\",\n      \"pmids\": [\"21896773\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"P. vivax GAMA (PvGAMA), the ortholog of PF3D7_0828800, localizes to micronemes in mature schizont-stage parasites and binds human erythrocytes regardless of Duffy antigen status. Erythrocyte binding activity of PvGAMA is significantly reduced by chymotrypsin treatment, indicating dependence on a chymotrypsin-sensitive receptor. Antibodies against PvGAMA fragments inhibit PvGAMA binding to erythrocytes in a dose-dependent manner.\",\n      \"method\": \"Immunofluorescence localization, erythrocyte binding assay with enzyme treatment (chymotrypsin, trypsin, neuraminidase), antibody inhibition assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization, receptor enzyme treatment assay, and antibody inhibition in single lab with multiple orthogonal methods, but in P. vivax ortholog only\",\n      \"pmids\": [\"27759110\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium vivax\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Recombinant PfGAMA (PF3D7_0828800) antibodies raised against the 3D7-based sequence inhibit merozoite invasion in the homologous 3D7 strain in vitro (GIA activity demonstrated), but not in the heterologous FVO strain, indicating strain-specific functional inhibition consistent with genetic diversity/polymorphism of pfgama.\",\n      \"method\": \"Growth inhibition assay (GIA) with rabbit antibodies against wheat germ cell-free expressed recombinant protein, using both 3D7 and FVO strains\",\n      \"journal\": \"Vaccine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional GIA in two strains, single lab, demonstrates invasion inhibition and strain-specificity\",\n      \"pmids\": [\"27692771\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"3D7\"}]\n    }\n  ],\n  \"current_model\": \"GAMA (PF3D7_0828800) is a GPI-anchored microneme protein of the P. falciparum merozoite that is synthesized late in schizogony, processed into two disulfide-linked fragments, and localized to apical micronemes; it binds a nonsialylated protein receptor on human erythrocytes via its C-terminal region, participates in the sialic acid-independent invasion pathway, and is essential for erythrocyte invasion as its gene is refractory to knockout.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"GAMA (PF3D7_0828800) is a GPI-anchored micronemal antigen of the Plasmodium falciparum merozoite that functions as an erythrocyte-binding protein during host cell invasion [#0, #1]. It is synthesized late in schizogony, processed into two disulfide-linked fragments, and translocated to apical micronemes, with a proportion detectable on the surface of free merozoites before the bulk of the protein is shed in soluble form after invasion [#0]. GAMA binds human erythrocytes reversibly through an epitope in its C-terminal region, engaging a nonsialylated protein receptor, and thereby contributes to the sialic acid-independent invasion pathway [#0, #1]. Anti-GAMA antibodies inhibit invasion dose-dependently, and the pfgama gene is refractory to knockout, indicating an essential role in invasion; inhibition by antibodies raised against the 3D7 sequence is strain-specific, blocking the homologous 3D7 strain but not the heterologous FVO strain, consistent with genetic polymorphism [#1, #3]. In the P. vivax ortholog PvGAMA, micronemal localization and Duffy-independent erythrocyte binding via a chymotrypsin-sensitive receptor are conserved [#2]. The identity of the erythrocyte receptor and the structural basis of binding have not been characterized in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"Establishing that GAMA is a micronemal, processed erythrocyte-binding protein defined it as a candidate invasion ligand rather than an uncharacterized ORF.\",\n      \"evidence\": \"Bioinformatic identification with immunoelectron microscopy, immunofluorescence, erythrocyte binding assay, and biochemical processing analysis in P. falciparum\",\n      \"pmids\": [\"19820120\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Receptor identity on the erythrocyte not determined\",\n        \"Functional requirement in invasion not tested\",\n        \"Binding region within GAMA not mapped\"\n      ],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Mapping the binding activity to the C-terminal region, showing a nonsialylated protein receptor, and finding the gene refractory to knockout established GAMA as an essential ligand of the sialic acid-independent invasion pathway.\",\n      \"evidence\": \"Immunoelectron microscopy, C-terminal recombinant erythrocyte binding assay, growth inhibition assay, and attempted gene knockout in P. falciparum\",\n      \"pmids\": [\"21896773\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Molecular identity of the nonsialylated receptor not established\",\n        \"Refractory knockout does not distinguish essentiality of invasion function from other roles\",\n        \"No structural basis for C-terminal binding\"\n      ],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Characterization of the P. vivax ortholog showed micronemal localization and Duffy-independent binding via a chymotrypsin-sensitive receptor are conserved features of the GAMA family.\",\n      \"evidence\": \"Immunofluorescence, erythrocyte binding with enzyme treatment (chymotrypsin/trypsin/neuraminidase), and antibody inhibition in P. vivax\",\n      \"pmids\": [\"27759110\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Finding is in the P. vivax ortholog, not PF3D7_0828800 itself\",\n        \"Receptor not molecularly identified\",\n        \"Requirement of PvGAMA for invasion not shown\"\n      ],\n      \"attribution\": [{\"species\": \"Plasmodium vivax\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstrating strain-specific invasion inhibition connected GAMA sequence polymorphism to functional antibody escape, a key consideration for vaccine candidacy.\",\n      \"evidence\": \"Growth inhibition assay with anti-3D7 recombinant GAMA antibodies against homologous 3D7 and heterologous FVO strains of P. falciparum\",\n      \"pmids\": [\"27692771\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Polymorphic residues responsible for strain-specificity not identified\",\n        \"Breadth across additional strains not assessed\",\n        \"In vivo protective relevance untested\"\n      ],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"3D7\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The molecular identity of the nonsialylated erythrocyte receptor for GAMA and the structural basis of its C-terminal binding remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Erythrocyte receptor not identified\",\n        \"No structure of the GAMA C-terminal binding region or its receptor complex\",\n        \"Role of GAMA processing and shedding in invasion mechanics unknown\"\n      ],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0030246\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0020009\", \"supporting_discovery_ids\": [0, 1, 2]},\n      {\"term_id\": \"GO:0009986\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0044409\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"complexes\": [],\n    \"partners\": [],\n    \"other_free_text\": [\n      \"Binds a nonsialylated, chymotrypsin-sensitive protein receptor on human erythrocytes via its C-terminal region [#1, #2]\",\n      \"Processed into two disulfide-linked fragments and shed in soluble form after invasion [#0]\",\n      \"pfgama gene refractory to knockout, indicating essentiality for invasion [#1]\",\n      \"Anti-GAMA antibodies inhibit invasion dose-dependently and in a strain-specific manner (3D7 vs FVO) [#1, #3]\"\n    ]\n  }\n}","audit_flag":null,"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_0828800","name":null,"product":"GPI-anchored micronemal antigen","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PbANKA","gene_id":"PBANKA_0701900","name":null,"product":"GPI-anchored micronemal antigen, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_1322900","name":null,"product":"GPI-anchored micronemal antigen, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"GAMA","evaluation":null}