{"gene":"PF3D7_1437400","run_date":"2026-09-08T14:19:07","timeline":{"discoveries":[{"year":2021,"finding":"PF3D7_1437400 (PfPanK2) associates with PfPanK1 to form a single, functional heteromeric pantothenate kinase complex; this is the first documented heteromeric PanK complex in nature. The complex also includes the multi-functional protein Pf14-3-3I.","method":"Biochemical association studies (co-immunoprecipitation/pulldown) and functional PanK activity assays with recombinant proteins in P. falciparum","journal":"PLoS pathogens","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal protein association demonstrated and functional activity confirmed, single lab, two orthogonal approaches (interaction + activity assay)","pmids":["34324601"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2016,"finding":"P. yoelii parasites lacking PanK2 (ortholog of PF3D7_1437400) undergo normal asexual blood stage development and sexual stage differentiation but are severely deficient in ookinete, oocyst, and sporozoite formation inside the mosquito vector, establishing an essential role for PanK2 in parasite transmission.","method":"Genetic knockout (KO) of PanK2 in P. yoelii with phenotypic analysis across life cycle stages and quantitative transcriptional analyses","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean genetic KO with defined stage-specific phenotypic readout and transcriptional follow-up, single lab","pmids":["27644319"],"is_preprint":false,"attribution":[{"species":"Plasmodium yoelii","strain":""}]},{"year":2016,"finding":"Knockout of PanK2 (ortholog of PF3D7_1437400) in P. yoelii alters the expression of other CoA biosynthesis genes, indicating that PanK2 plays a regulatory role in the CoA biosynthesis pathway beyond simple enzymatic activity.","method":"Quantitative transcriptional analysis in PanK2 knockout P. yoelii parasites compared to wild-type","journal":"Scientific reports","confidence":"Low","confidence_rationale":"Tier 3 / Weak — transcriptional readout from a KO, single method, single lab; regulatory mechanism not directly tested","pmids":["27644319"],"is_preprint":false,"attribution":[{"species":"Plasmodium yoelii","strain":""}]}],"current_model":"PF3D7_1437400 (PfPanK2) does not function as an independent homodimeric pantothenate kinase but instead forms a novel heteromeric complex with PfPanK1 (and Pf14-3-3I) that together catalyze the first, rate-limiting step of CoA biosynthesis from pantothenate; in rodent malaria (P. yoelii), the ortholog is dispensable for asexual blood-stage growth but essential for mosquito-stage development (ookinete, oocyst, sporozoite formation), and its loss dysregulates expression of other CoA biosynthesis genes."},"narrative":{"mechanistic_narrative":"PF3D7_1437400 (PfPanK2) is a subunit of the parasite pantothenate kinase machinery that catalyzes the first, rate-limiting step of coenzyme A biosynthesis from pantothenate. Rather than acting as an independent homodimeric kinase, PF3D7_1437400 associates with PfPanK1 to form a single functional heteromeric pantothenate kinase complex—the first documented heteromeric PanK complex in nature—which also incorporates the multi-functional protein Pf14-3-3I [PMID:34324601]. In the rodent malaria model P. yoelii, the PANK2 ortholog is dispensable for asexual blood-stage growth and sexual differentiation but is essential for mosquito-stage development, with its loss severely impairing ookinete, oocyst, and sporozoite formation and dysregulating the expression of other CoA biosynthesis genes [PMID:27644319]. Beyond its role in the heteromeric complex and its transmission-stage phenotype, no further mechanistic detail on PF3D7_1437400 has been characterized in the available corpus.","teleology":[{"year":2016,"claim":"Whether PANK2 is required across the parasite life cycle was unknown; genetic ablation established that it is dispensable for blood-stage growth but essential for parasite transmission through the mosquito.","evidence":"Genetic knockout of the PanK2 ortholog in P. yoelii with phenotypic analysis across life-cycle stages","pmids":["27644319"],"confidence":"Medium","gaps":["Does not test whether the P. falciparum ortholog has the same stage-specific requirement","Molecular basis of the mosquito-stage block (which CoA-dependent process fails) not defined","No direct enzymatic characterization of the ortholog"],"attribution":[{"species":"Plasmodium yoelii","strain":""}]},{"year":2016,"claim":"Whether PANK2 acts only enzymatically or also shapes the pathway was addressed by transcriptional profiling of the knockout, which showed altered expression of other CoA biosynthesis genes, implying a regulatory role beyond catalysis.","evidence":"Quantitative transcriptional analysis in PanK2 knockout versus wild-type P. yoelii","pmids":["27644319"],"confidence":"Low","gaps":["Regulatory mechanism not directly tested — transcriptional change could be indirect/compensatory","No demonstration that PANK2 directly controls the affected genes","Single method, single lab"],"attribution":[{"species":"Plasmodium yoelii","strain":""}]},{"year":2021,"claim":"The long-standing assumption that PanK enzymes function as homodimers was overturned for the parasite by showing PF3D7_1437400 forms a heteromeric pantothenate kinase complex with PfPanK1 and Pf14-3-3I that carries the catalytic activity.","evidence":"Co-immunoprecipitation/pulldown association studies plus PanK activity assays with recombinant proteins in P. falciparum","pmids":["34324601"],"confidence":"Medium","gaps":["Individual catalytic contribution of PF3D7_1437400 versus PfPanK1 within the complex not resolved","Structural architecture and stoichiometry of the complex unknown","Functional role of Pf14-3-3I in the complex not defined"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":null,"claim":"How the heteromeric complex catalysis (P. falciparum) connects mechanistically to the transmission-stage essentiality (P. yoelii), and whether PF3D7_1437400 itself contributes catalytic residues, remains unresolved.","evidence":"No timeline discovery bridges the biochemical complex and the life-cycle phenotype","pmids":[],"confidence":"Low","gaps":["No structural model of the heteromeric complex","No test of whether the transmission defect reflects loss of complex activity specifically","Species divergence between the biochemical (P. falciparum) and genetic (P. yoelii) evidence not reconciled"],"attribution":[]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":["Heteromeric pantothenate kinase complex (PfPanK2–PfPanK1–Pf14-3-3I)"],"partners":["PFPANK1","PF14-3-3I"],"other_free_text":["In P. yoelii, the PANK2 ortholog is dispensable for asexual blood-stage growth and sexual differentiation but essential for ookinete, oocyst, and sporozoite formation in the mosquito [#1].","Knockout of the P. yoelii ortholog dysregulates expression of other CoA biosynthesis genes, indicating a possible regulatory role in the pathway [#2].","The PfPanK2-containing complex represents the first documented heteromeric pantothenate kinase complex in nature [#0]."]}},"prefetch_data":{},"corpus_meta":[{"pmid":"27644319","id":"PMC_27644319","title":"Genetic Characterization of Plasmodium Putative Pantothenate Kinase Genes Reveals Their Essential Role in Malaria Parasite Transmission to the Mosquito.","date":"2016","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/27644319","citation_count":21,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["PANK2"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"34324601","id":"PMC_34324601","title":"A novel heteromeric pantothenate kinase complex in apicomplexan parasites.","date":"2021","source":"PLoS pathogens","url":"https://pubmed.ncbi.nlm.nih.gov/34324601","citation_count":16,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["PANK2","PfPANK2"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"33768012","id":"PMC_33768012","title":"Characterization of Plasmodium falciparum Pantothenate Kinase and Identification of Its Inhibitors From Natural Products.","date":"2021","source":"Frontiers in cellular and infection microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/33768012","citation_count":12,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["PfPANK2"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":4129,"output_tokens":925,"usd":0.013131,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":5631,"output_tokens":1983,"usd":0.038865,"stage2_stop_reason":"end_turn"},"total_usd":0.051996,"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\": 2021,\n      \"finding\": \"PF3D7_1437400 (PfPanK2) associates with PfPanK1 to form a single, functional heteromeric pantothenate kinase complex; this is the first documented heteromeric PanK complex in nature. The complex also includes the multi-functional protein Pf14-3-3I.\",\n      \"method\": \"Biochemical association studies (co-immunoprecipitation/pulldown) and functional PanK activity assays with recombinant proteins in P. falciparum\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal protein association demonstrated and functional activity confirmed, single lab, two orthogonal approaches (interaction + activity assay)\",\n      \"pmids\": [\"34324601\"],\n      \"is_preprint\": false,\n      \"attribution\": [\n        {\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"P. yoelii parasites lacking PanK2 (ortholog of PF3D7_1437400) undergo normal asexual blood stage development and sexual stage differentiation but are severely deficient in ookinete, oocyst, and sporozoite formation inside the mosquito vector, establishing an essential role for PanK2 in parasite transmission.\",\n      \"method\": \"Genetic knockout (KO) of PanK2 in P. yoelii with phenotypic analysis across life cycle stages and quantitative transcriptional analyses\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean genetic KO with defined stage-specific phenotypic readout and transcriptional follow-up, single lab\",\n      \"pmids\": [\"27644319\"],\n      \"is_preprint\": false,\n      \"attribution\": [\n        {\"species\": \"Plasmodium yoelii\", \"strain\": \"\"}\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Knockout of PanK2 (ortholog of PF3D7_1437400) in P. yoelii alters the expression of other CoA biosynthesis genes, indicating that PanK2 plays a regulatory role in the CoA biosynthesis pathway beyond simple enzymatic activity.\",\n      \"method\": \"Quantitative transcriptional analysis in PanK2 knockout P. yoelii parasites compared to wild-type\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — transcriptional readout from a KO, single method, single lab; regulatory mechanism not directly tested\",\n      \"pmids\": [\"27644319\"],\n      \"is_preprint\": false,\n      \"attribution\": [\n        {\"species\": \"Plasmodium yoelii\", \"strain\": \"\"}\n      ]\n    }\n  ],\n  \"current_model\": \"PF3D7_1437400 (PfPanK2) does not function as an independent homodimeric pantothenate kinase but instead forms a novel heteromeric complex with PfPanK1 (and Pf14-3-3I) that together catalyze the first, rate-limiting step of CoA biosynthesis from pantothenate; in rodent malaria (P. yoelii), the ortholog is dispensable for asexual blood-stage growth but essential for mosquito-stage development (ookinete, oocyst, sporozoite formation), and its loss dysregulates expression of other CoA biosynthesis genes.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"PF3D7_1437400 (PfPanK2) is a subunit of the parasite pantothenate kinase machinery that catalyzes the first, rate-limiting step of coenzyme A biosynthesis from pantothenate. Rather than acting as an independent homodimeric kinase, PF3D7_1437400 associates with PfPanK1 to form a single functional heteromeric pantothenate kinase complex—the first documented heteromeric PanK complex in nature—which also incorporates the multi-functional protein Pf14-3-3I [#0]. In the rodent malaria model P. yoelii, the PANK2 ortholog is dispensable for asexual blood-stage growth and sexual differentiation but is essential for mosquito-stage development, with its loss severely impairing ookinete, oocyst, and sporozoite formation and dysregulating the expression of other CoA biosynthesis genes [#1, #2]. Beyond its role in the heteromeric complex and its transmission-stage phenotype, no further mechanistic detail on PF3D7_1437400 has been characterized in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 2016,\n      \"claim\": \"Whether PANK2 is required across the parasite life cycle was unknown; genetic ablation established that it is dispensable for blood-stage growth but essential for parasite transmission through the mosquito.\",\n      \"evidence\": \"Genetic knockout of the PanK2 ortholog in P. yoelii with phenotypic analysis across life-cycle stages\",\n      \"pmids\": [\"27644319\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Does not test whether the P. falciparum ortholog has the same stage-specific requirement\",\n        \"Molecular basis of the mosquito-stage block (which CoA-dependent process fails) not defined\",\n        \"No direct enzymatic characterization of the ortholog\"\n      ],\n      \"attribution\": [{\"species\": \"Plasmodium yoelii\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Whether PANK2 acts only enzymatically or also shapes the pathway was addressed by transcriptional profiling of the knockout, which showed altered expression of other CoA biosynthesis genes, implying a regulatory role beyond catalysis.\",\n      \"evidence\": \"Quantitative transcriptional analysis in PanK2 knockout versus wild-type P. yoelii\",\n      \"pmids\": [\"27644319\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"Regulatory mechanism not directly tested — transcriptional change could be indirect/compensatory\",\n        \"No demonstration that PANK2 directly controls the affected genes\",\n        \"Single method, single lab\"\n      ],\n      \"attribution\": [{\"species\": \"Plasmodium yoelii\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"The long-standing assumption that PanK enzymes function as homodimers was overturned for the parasite by showing PF3D7_1437400 forms a heteromeric pantothenate kinase complex with PfPanK1 and Pf14-3-3I that carries the catalytic activity.\",\n      \"evidence\": \"Co-immunoprecipitation/pulldown association studies plus PanK activity assays with recombinant proteins in P. falciparum\",\n      \"pmids\": [\"34324601\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Individual catalytic contribution of PF3D7_1437400 versus PfPanK1 within the complex not resolved\",\n        \"Structural architecture and stoichiometry of the complex unknown\",\n        \"Functional role of Pf14-3-3I in the complex not defined\"\n      ],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the heteromeric complex catalysis (P. falciparum) connects mechanistically to the transmission-stage essentiality (P. yoelii), and whether PF3D7_1437400 itself contributes catalytic residues, remains unresolved.\",\n      \"evidence\": \"No timeline discovery bridges the biochemical complex and the life-cycle phenotype\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No structural model of the heteromeric complex\",\n        \"No test of whether the transmission defect reflects loss of complex activity specifically\",\n        \"Species divergence between the biochemical (P. falciparum) and genetic (P. yoelii) evidence not reconciled\"\n      ],\n      \"attribution\": []\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0004594\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [],\n    \"pathway\": [\n      {\"term_id\": \"GO:0015937\", \"supporting_discovery_ids\": [0, 1, 2]}\n    ],\n    \"complexes\": [\n      \"Heteromeric pantothenate kinase complex (PfPanK2–PfPanK1–Pf14-3-3I)\"\n    ],\n    \"partners\": [\n      \"PfPanK1\",\n      \"Pf14-3-3I\"\n    ],\n    \"other_free_text\": [\n      \"In P. yoelii, the PANK2 ortholog is dispensable for asexual blood-stage growth and sexual differentiation but essential for ookinete, oocyst, and sporozoite formation in the mosquito [#1].\",\n      \"Knockout of the P. yoelii ortholog dysregulates expression of other CoA biosynthesis genes, indicating a possible regulatory role in the pathway [#2].\",\n      \"The PfPanK2-containing complex represents the first documented heteromeric pantothenate kinase complex in nature [#0].\"\n    ]\n  }\n}\n```","audit_flag":null,"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_1437400","name":null,"product":"pantothenate kinase 2","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PbANKA","gene_id":"PBANKA_0611400","name":null,"product":"pantothenate kinase 2, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_0424100","name":null,"product":"pantothenate kinase 2, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"PANK2","evaluation":null}