{"gene":"PF3D7_1235700","run_date":"2026-09-08T14:19:06","timeline":{"discoveries":[{"year":2011,"finding":"The ATP synthase β subunit (PF3D7_1235700) localizes to the mitochondrion in P. falciparum blood stages, as shown by epitope-tagging. Blue native gel electrophoresis of P. falciparum mitochondrial membranes indicated the ATP synthase complex assembles as a dimer with a molecular mass greater than 1 million daltons, suggesting the presence of previously unknown subunits beyond the canonical ones. Attempts to disrupt the β subunit gene were unsuccessful, indicating an essential role in blood-stage parasites.","method":"Epitope-tagging of transgenic P. falciparum lines, immunofluorescence localization, blue native gel electrophoresis, and attempted gene disruption","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (subcellular localization, native gel electrophoresis, genetic disruption attempts) in a single focused study on this specific subunit","pmids":["21984828"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2015,"finding":"Knockout of the ATP synthase β subunit gene in P. berghei only marginally reduced asexual blood-stage parasite growth but completely blocked mosquito-stage transmission. Parasites lacking the β subunit generated viable gametes and ookinetes with normal motility, but ookinetes could not survive in the mosquito midgut and never formed oocysts or sporozoites. Genetic crossing of the β subunit knockout with a male-deficient strain restored oocyst and sporozoite production, demonstrating that mitochondrial ATP synthase is essential for viability through the female (mitochondrion-carrying) line of sexual reproduction.","method":"Gene knockout in P. berghei, mosquito transmission assays, genetic crossing experiments","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean gene knockout with defined life-cycle phenotype, confirmed by genetic complementation cross, replicated across multiple experimental conditions","pmids":["25831536"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2024,"finding":"Mitochondrial ATP synthesis is essential for gametogenesis completion in P. falciparum. Using a genetically encoded ratiometric ATP sensor and functional mitochondrial labelling, male gametocyte mitochondria were shown to be less active than female gametocyte mitochondria and more sensitive to inhibitors of mitochondrial energy metabolism. Gametocytes can maintain cytoplasmic ATP homeostasis in the absence of mitochondrial respiration, indicating the mitochondrial ATP synthase function is specifically required for gametogenesis rather than for general cellular energy supply.","method":"Genetically encoded ratiometric ATP sensor, functional mitochondrial labelling, sex-specific antibody staining, pharmacological inhibition of mitochondrial ATP synthesis","journal":"Communications biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional assays with ATP sensor and mitochondrial labelling in a single lab; implicates the ATP synthase complex in gametogenesis but does not isolate the β subunit specifically","pmids":["39550509"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"current_model":"PF3D7_1235700 (ATP synthase β subunit) localizes to the P. falciparum mitochondrion, assembles into a large (>1 MDa) dimeric complex, is refractory to genetic disruption in P. falciparum blood stages (suggesting essentiality), and—as demonstrated by knockout in P. berghei—is dispensable for asexual blood-stage growth but absolutely required for parasite survival in the mosquito midgut and completion of the sexual (female-line) reproductive cycle, making it a validated target for transmission-blocking antimalarial strategies."},"narrative":{"mechanistic_narrative":"PF3D7_1235700 is the mitochondrial ATP synthase β subunit of Plasmodium falciparum, localizing to the parasite mitochondrion and assembling into a dimeric ATP synthase complex exceeding 1 MDa whose native mass implies additional, non-canonical subunits beyond those of textbook ATP synthases [PMID:21984828]. In P. falciparum blood stages the subunit is refractory to gene disruption, indicating an essential role at that stage [PMID:21984828]. The developmental requirement was resolved genetically in the P. berghei ortholog: knockout only marginally reduced asexual blood-stage growth but completely abolished mosquito transmission, with ookinetes forming and moving normally yet dying in the midgut and never producing oocysts or sporozoites; crossing the knockout to a male-deficient strain restored transmission, establishing that mitochondrial ATP synthase acts through the female (mitochondrion-carrying) line of sexual reproduction [PMID:25831536]. Consistent with a stage-specific rather than general bioenergetic role, gametocytes sustain cytoplasmic ATP homeostasis without mitochondrial respiration, so mitochondrial ATP synthase function is specifically demanded for gametogenesis completion in P. falciparum [PMID:39550509]. Beyond these findings—subcellular localization, complex assembly, essentiality, and a transmission-stage requirement—no further biochemical or structural detail of the β subunit has been characterized in the available corpus.","teleology":[{"year":2011,"claim":"Established that PF3D7_1235700 is a genuine mitochondrial ATP synthase component in P. falciparum and that the complex has an unexpectedly large, likely multi-subunit dimeric architecture, framing it as an essential blood-stage protein.","evidence":"Epitope-tagging with immunofluorescence, blue native gel electrophoresis of mitochondrial membranes, and attempted gene disruption in transgenic P. falciparum","pmids":["21984828"],"confidence":"High","gaps":["Identity of the inferred non-canonical subunits was not determined","Essentiality was inferred from failed disruption, not a conditional knockdown","Enzymatic activity of the β subunit itself was not directly measured"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2015,"claim":"Resolved the stage-specific requirement of the β subunit by showing it is largely dispensable for asexual growth but obligatory for female-line sexual reproduction and mosquito-stage transmission.","evidence":"Gene knockout in P. berghei with mosquito transmission assays and genetic crossing against a male-deficient strain","pmids":["25831536"],"confidence":"High","gaps":["Ortholog studied in P. berghei, not P. falciparum, where blood-stage disruption failed","Mechanism by which ookinetes die specifically in the midgut is undefined","Why the requirement is restricted to the female line at the molecular level is not established"],"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2024,"claim":"Clarified that the mitochondrial ATP synthase requirement in gametogenesis reflects a specific developmental demand rather than general cellular energy supply, and revealed sex-differential mitochondrial activity.","evidence":"Genetically encoded ratiometric ATP sensor, functional mitochondrial labelling, sex-specific antibody staining, and pharmacological inhibition of mitochondrial ATP synthesis in P. falciparum gametocytes","pmids":["39550509"],"confidence":"Medium","gaps":["Assays implicate the ATP synthase complex generally and do not isolate the β subunit specifically","Single-lab functional study without genetic knockout of the β subunit in P. falciparum","Downstream targets of the required ATP during gametogenesis are unknown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":null,"claim":"The molecular composition of the >1 MDa dimeric complex, the catalytic contribution of the β subunit itself, and the mechanistic basis for its female-line and midgut-specific requirement remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model or subunit inventory of the P. falciparum ATP synthase dimer","No direct demonstration that the β subunit specifically (vs the complex) drives the gametogenesis phenotype","No conditional-knockdown validation of blood-stage essentiality in P. falciparum"],"attribution":[]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":["Mitochondrial ATP synthase complex (dimeric, >1 MDa) [#0]"],"partners":[],"other_free_text":["Refractory to gene disruption in P. falciparum blood stages, indicating blood-stage essentiality [#0]","In P. berghei, dispensable for asexual growth but required for female-line sexual reproduction and mosquito transmission (ookinetes die in midgut, no oocysts/sporozoites) [#1]","Required specifically for gametogenesis completion rather than general cellular ATP supply in P. falciparum gametocytes [#2]","Female gametocyte mitochondria are more active than male; male mitochondria more sensitive to energy-metabolism inhibitors [#2]","Candidate transmission-blocking antimalarial target [#1, #2]"]}},"prefetch_data":{},"corpus_meta":[{"pmid":"19575561","id":"PMC_19575561","title":"Mitochondrial evolution and functions in malaria parasites.","date":"2009","source":"Annual review of microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/19575561","citation_count":183,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["ATP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"25831536","id":"PMC_25831536","title":"Mitochondrial ATP synthase is dispensable in blood-stage Plasmodium berghei rodent malaria but essential in the mosquito phase.","date":"2015","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/25831536","citation_count":91,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["ATP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"15552397","id":"PMC_15552397","title":"The multiple roles of the mitochondrion of the malarial parasite.","date":"2004","source":"Parasitology","url":"https://pubmed.ncbi.nlm.nih.gov/15552397","citation_count":66,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["ATP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"25823686","id":"PMC_25823686","title":"Triaminopyrimidine is a fast-killing and long-acting antimalarial clinical candidate.","date":"2015","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/25823686","citation_count":59,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["ATP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"21984828","id":"PMC_21984828","title":"ATP synthase complex of Plasmodium falciparum: dimeric assembly in mitochondrial membranes and resistance to genetic disruption.","date":"2011","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/21984828","citation_count":54,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["ATP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"19682605","id":"PMC_19682605","title":"Identification of mitochondrial Complex II subunits SDH3 and SDH4 and ATP synthase subunits a and b in Plasmodium spp.","date":"2009","source":"Mitochondrion","url":"https://pubmed.ncbi.nlm.nih.gov/19682605","citation_count":27,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["ATP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"2972931","id":"PMC_2972931","title":"Purification of Plasmodium falciparum digestive vacuoles and partial characterization of the vacuolar membrane ATPase.","date":"1988","source":"Molecular and biochemical parasitology","url":"https://pubmed.ncbi.nlm.nih.gov/2972931","citation_count":25,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["ATP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"28875841","id":"PMC_28875841","title":"New Molecular Targets and Strategies for Antimalarial Discovery.","date":"2019","source":"Current medicinal chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/28875841","citation_count":23,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["ATP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"39550509","id":"PMC_39550509","title":"Mitochondrial ATP synthesis is essential for efficient gametogenesis in Plasmodium falciparum.","date":"2024","source":"Communications biology","url":"https://pubmed.ncbi.nlm.nih.gov/39550509","citation_count":10,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["ATP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":6337,"output_tokens":1105,"usd":0.017793,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":5993,"output_tokens":2221,"usd":0.042745,"stage2_stop_reason":"end_turn"},"total_usd":0.060538,"stage1_batch_id":"msgbatch_011BPjN2BL33F8cJXD1r7V7T","stage2_batch_id":"msgbatch_01Qwg6vP7qxkpL6Gsc7tajsb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2011,\n      \"finding\": \"The ATP synthase β subunit (PF3D7_1235700) localizes to the mitochondrion in P. falciparum blood stages, as shown by epitope-tagging. Blue native gel electrophoresis of P. falciparum mitochondrial membranes indicated the ATP synthase complex assembles as a dimer with a molecular mass greater than 1 million daltons, suggesting the presence of previously unknown subunits beyond the canonical ones. Attempts to disrupt the β subunit gene were unsuccessful, indicating an essential role in blood-stage parasites.\",\n      \"method\": \"Epitope-tagging of transgenic P. falciparum lines, immunofluorescence localization, blue native gel electrophoresis, and attempted gene disruption\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (subcellular localization, native gel electrophoresis, genetic disruption attempts) in a single focused study on this specific subunit\",\n      \"pmids\": [\"21984828\"],\n      \"is_preprint\": false,\n      \"attribution\": [\n        {\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}\n      ]\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Knockout of the ATP synthase β subunit gene in P. berghei only marginally reduced asexual blood-stage parasite growth but completely blocked mosquito-stage transmission. Parasites lacking the β subunit generated viable gametes and ookinetes with normal motility, but ookinetes could not survive in the mosquito midgut and never formed oocysts or sporozoites. Genetic crossing of the β subunit knockout with a male-deficient strain restored oocyst and sporozoite production, demonstrating that mitochondrial ATP synthase is essential for viability through the female (mitochondrion-carrying) line of sexual reproduction.\",\n      \"method\": \"Gene knockout in P. berghei, mosquito transmission assays, genetic crossing experiments\",\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 gene knockout with defined life-cycle phenotype, confirmed by genetic complementation cross, replicated across multiple experimental conditions\",\n      \"pmids\": [\"25831536\"],\n      \"is_preprint\": false,\n      \"attribution\": [\n        {\"species\": \"Plasmodium berghei\", \"strain\": \"\"}\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Mitochondrial ATP synthesis is essential for gametogenesis completion in P. falciparum. Using a genetically encoded ratiometric ATP sensor and functional mitochondrial labelling, male gametocyte mitochondria were shown to be less active than female gametocyte mitochondria and more sensitive to inhibitors of mitochondrial energy metabolism. Gametocytes can maintain cytoplasmic ATP homeostasis in the absence of mitochondrial respiration, indicating the mitochondrial ATP synthase function is specifically required for gametogenesis rather than for general cellular energy supply.\",\n      \"method\": \"Genetically encoded ratiometric ATP sensor, functional mitochondrial labelling, sex-specific antibody staining, pharmacological inhibition of mitochondrial ATP synthesis\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional assays with ATP sensor and mitochondrial labelling in a single lab; implicates the ATP synthase complex in gametogenesis but does not isolate the β subunit specifically\",\n      \"pmids\": [\"39550509\"],\n      \"is_preprint\": false,\n      \"attribution\": [\n        {\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}\n      ]\n    }\n  ],\n  \"current_model\": \"PF3D7_1235700 (ATP synthase β subunit) localizes to the P. falciparum mitochondrion, assembles into a large (>1 MDa) dimeric complex, is refractory to genetic disruption in P. falciparum blood stages (suggesting essentiality), and—as demonstrated by knockout in P. berghei—is dispensable for asexual blood-stage growth but absolutely required for parasite survival in the mosquito midgut and completion of the sexual (female-line) reproductive cycle, making it a validated target for transmission-blocking antimalarial strategies.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PF3D7_1235700 is the mitochondrial ATP synthase β subunit of Plasmodium falciparum, localizing to the parasite mitochondrion and assembling into a dimeric ATP synthase complex exceeding 1 MDa whose native mass implies additional, non-canonical subunits beyond those of textbook ATP synthases [#0]. In P. falciparum blood stages the subunit is refractory to gene disruption, indicating an essential role at that stage [#0]. The developmental requirement was resolved genetically in the P. berghei ortholog: knockout only marginally reduced asexual blood-stage growth but completely abolished mosquito transmission, with ookinetes forming and moving normally yet dying in the midgut and never producing oocysts or sporozoites; crossing the knockout to a male-deficient strain restored transmission, establishing that mitochondrial ATP synthase acts through the female (mitochondrion-carrying) line of sexual reproduction [#1]. Consistent with a stage-specific rather than general bioenergetic role, gametocytes sustain cytoplasmic ATP homeostasis without mitochondrial respiration, so mitochondrial ATP synthase function is specifically demanded for gametogenesis completion in P. falciparum [#2]. Beyond these findings—subcellular localization, complex assembly, essentiality, and a transmission-stage requirement—no further biochemical or structural detail of the β subunit has been characterized in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 2011,\n      \"claim\": \"Established that PF3D7_1235700 is a genuine mitochondrial ATP synthase component in P. falciparum and that the complex has an unexpectedly large, likely multi-subunit dimeric architecture, framing it as an essential blood-stage protein.\",\n      \"evidence\": \"Epitope-tagging with immunofluorescence, blue native gel electrophoresis of mitochondrial membranes, and attempted gene disruption in transgenic P. falciparum\",\n      \"pmids\": [\"21984828\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Identity of the inferred non-canonical subunits was not determined\",\n        \"Essentiality was inferred from failed disruption, not a conditional knockdown\",\n        \"Enzymatic activity of the β subunit itself was not directly measured\"\n      ],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Resolved the stage-specific requirement of the β subunit by showing it is largely dispensable for asexual growth but obligatory for female-line sexual reproduction and mosquito-stage transmission.\",\n      \"evidence\": \"Gene knockout in P. berghei with mosquito transmission assays and genetic crossing against a male-deficient strain\",\n      \"pmids\": [\"25831536\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Ortholog studied in P. berghei, not P. falciparum, where blood-stage disruption failed\",\n        \"Mechanism by which ookinetes die specifically in the midgut is undefined\",\n        \"Why the requirement is restricted to the female line at the molecular level is not established\"\n      ],\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Clarified that the mitochondrial ATP synthase requirement in gametogenesis reflects a specific developmental demand rather than general cellular energy supply, and revealed sex-differential mitochondrial activity.\",\n      \"evidence\": \"Genetically encoded ratiometric ATP sensor, functional mitochondrial labelling, sex-specific antibody staining, and pharmacological inhibition of mitochondrial ATP synthesis in P. falciparum gametocytes\",\n      \"pmids\": [\"39550509\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Assays implicate the ATP synthase complex generally and do not isolate the β subunit specifically\",\n        \"Single-lab functional study without genetic knockout of the β subunit in P. falciparum\",\n        \"Downstream targets of the required ATP during gametogenesis are unknown\"\n      ],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The molecular composition of the >1 MDa dimeric complex, the catalytic contribution of the β subunit itself, and the mechanistic basis for its female-line and midgut-specific requirement remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No structural model or subunit inventory of the P. falciparum ATP synthase dimer\",\n        \"No direct demonstration that the β subunit specifically (vs the complex) drives the gametogenesis phenotype\",\n        \"No conditional-knockdown validation of blood-stage essentiality in P. falciparum\"\n      ],\n      \"attribution\": []\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0046933\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0042775\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0007140\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"complexes\": [\n      \"Mitochondrial ATP synthase complex (dimeric, >1 MDa) [#0]\"\n    ],\n    \"partners\": [],\n    \"other_free_text\": [\n      \"Refractory to gene disruption in P. falciparum blood stages, indicating blood-stage essentiality [#0]\",\n      \"In P. berghei, dispensable for asexual growth but required for female-line sexual reproduction and mosquito transmission (ookinetes die in midgut, no oocysts/sporozoites) [#1]\",\n      \"Required specifically for gametogenesis completion rather than general cellular ATP supply in P. falciparum gametocytes [#2]\",\n      \"Female gametocyte mitochondria are more active than male; male mitochondria more sensitive to energy-metabolism inhibitors [#2]\",\n      \"Candidate transmission-blocking antimalarial target [#1, #2]\"\n    ]\n  }\n}","audit_flag":null,"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_1235700","name":null,"product":"ATP synthase subunit beta, mitochondrial","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PbANKA","gene_id":"PBANKA_1450300","name":null,"product":"ATP synthase subunit beta, mitochondrial","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_1455400","name":null,"product":"ATP synthase subunit beta, mitochondrial, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"ATPbeta","evaluation":null}