{"gene":"PF3D7_1320000","run_date":"2026-09-08T14:19:06","timeline":{"discoveries":[{"year":2015,"finding":"GP1 (PF3D7_1320000) was identified as a resident Golgi apparatus protein in P. falciparum that localizes to the Golgi throughout the asexual erythrocytic cycle, as demonstrated by colocalization imaging experiments; it was not secreted during merozoite invasion.","method":"Fluorescence colocalization imaging across the asexual erythrocytic cycle; imaging of merozoites during invasion","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct localization by imaging in multiple parasite stages, single lab, single method","pmids":["26375591"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2018,"finding":"GP1 (PF3D7_1320000) forms a protein complex with a previously uncharacterised transmembrane protein (Golgi Protein 2, GP2); the complex localises to the cis-Golgi throughout the erythrocytic cycle and potentially during mosquito stages. Conditional repression of GP1 expression and/or inactivation of GP2 revealed that the complex is not essential for any life cycle stage but is important for optimal asexual blood-stage development.","method":"Co-immunoprecipitation / complex identification; conditional knockdown of GP1; GP2 gene knockout; fluorescence localization across life cycle stages","journal":"Cellular microbiology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal complex identification, conditional knockdown, gene knockout with defined phenotypic readout, multiple orthogonal methods in one study","pmids":["29579782"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"current_model":"GP1 (PF3D7_1320000) is a P. falciparum cis-Golgi resident protein that forms a stable complex with a transmembrane partner (GP2) throughout the asexual erythrocytic cycle; the complex is not essential for parasite viability but is required for optimal asexual blood-stage development, and GP1 remains Golgi-associated and is not secreted during merozoite invasion."},"narrative":{"mechanistic_narrative":"GP1 (PF3D7_1320000) is a resident Golgi apparatus protein of Plasmodium falciparum that localizes to the Golgi throughout the asexual erythrocytic cycle and is not secreted during merozoite invasion [PMID:26375591]. GP1 forms a stable protein complex with a transmembrane partner, Golgi Protein 2 (GP2), that localizes specifically to the cis-Golgi across the erythrocytic cycle [PMID:29579782]. Conditional repression of GP1 together with GP2 inactivation established that this complex is dispensable for every life cycle stage but is required for optimal asexual blood-stage development [PMID:29579782]. Beyond its Golgi residence and its association with GP2, no molecular activity, substrate, or downstream pathway for GP1 has been characterized in the available corpus.","teleology":[{"year":2015,"claim":"Establishing the subcellular home of an uncharacterized parasite protein was the first step: GP1 was shown to be a genuine Golgi resident rather than a transiting or secreted factor, fixing where in the secretory system it must act.","evidence":"Fluorescence colocalization imaging across the asexual erythrocytic cycle and imaging of invading merozoites in P. falciparum","pmids":["26375591"],"confidence":"Medium","gaps":["No molecular function or biochemical activity assigned to the Golgi localization","Single-lab, single-method localization not corroborated by orthogonal biochemistry","Sub-Golgi compartment (cis vs trans) not resolved at this stage"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2018,"claim":"Whether GP1 acts alone or within a complex, and whether it is essential, was resolved by identifying a stable GP1–GP2 cis-Golgi complex and testing its requirement genetically, defining GP1 as a non-essential but growth-optimizing Golgi factor.","evidence":"Co-immunoprecipitation/complex identification, conditional knockdown of GP1, GP2 gene knockout, and life-cycle fluorescence localization in P. falciparum","pmids":["29579782"],"confidence":"High","gaps":["The biochemical function of the GP1–GP2 complex remains undefined","The molecular basis of the asexual growth defect upon complex loss is unknown","Whether GP1 has GP2-independent roles was not tested"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":null,"claim":"The molecular activity of GP1 at the cis-Golgi and the mechanism by which the GP1–GP2 complex supports optimal asexual development remain unresolved.","evidence":"No further mechanistic evidence in the available corpus","pmids":[],"confidence":"Medium","gaps":["No enzymatic or transport activity identified for GP1","No structural information on the GP1–GP2 complex","Downstream cargo, pathway, or process affected by the complex is uncharacterized"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":["GP1–GP2 cis-Golgi complex"],"partners":["GP2 (GOLGI PROTEIN 2, TRANSMEMBRANE PARTNER)"],"other_free_text":["Resident Golgi protein present throughout the asexual erythrocytic cycle and not secreted during merozoite invasion [#0].","The GP1-containing complex is dispensable for all life cycle stages but required for optimal asexual blood-stage development [#1]."]}},"prefetch_data":{},"corpus_meta":[{"pmid":"2651919","id":"PMC_2651919","title":"Polymorphism of a 35-48 kDa Plasmodium falciparum merozoite surface antigen.","date":"1989","source":"Molecular and biochemical parasitology","url":"https://pubmed.ncbi.nlm.nih.gov/2651919","citation_count":54,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["GP1"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"19428669","id":"PMC_19428669","title":"Localisation and timing of expression of putative Plasmodium berghei rhoptry proteins in merozoites and sporozoites.","date":"2009","source":"Molecular and biochemical parasitology","url":"https://pubmed.ncbi.nlm.nih.gov/19428669","citation_count":32,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["PRP2","PbPRP2"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"29579782","id":"PMC_29579782","title":"Identification of a Golgi apparatus protein complex important for the asexual erythrocytic cycle of the malaria parasite Plasmodium falciparum.","date":"2018","source":"Cellular microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/29579782","citation_count":13,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["GP1"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"26375591","id":"PMC_26375591","title":"Evidence that the Malaria Parasite Plasmodium falciparum Putative Rhoptry Protein 2 Localizes to the Golgi Apparatus throughout the Erythrocytic Cycle.","date":"2015","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/26375591","citation_count":10,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["PfPRP2","PbPRP2"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":4410,"output_tokens":643,"usd":0.011437,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":5249,"output_tokens":1526,"usd":0.032197,"stage2_stop_reason":"end_turn"},"total_usd":0.043634,"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\": 2015,\n      \"finding\": \"GP1 (PF3D7_1320000) was identified as a resident Golgi apparatus protein in P. falciparum that localizes to the Golgi throughout the asexual erythrocytic cycle, as demonstrated by colocalization imaging experiments; it was not secreted during merozoite invasion.\",\n      \"method\": \"Fluorescence colocalization imaging across the asexual erythrocytic cycle; imaging of merozoites during invasion\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct localization by imaging in multiple parasite stages, single lab, single method\",\n      \"pmids\": [\"26375591\"],\n      \"is_preprint\": false,\n      \"attribution\": [\n        {\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"GP1 (PF3D7_1320000) forms a protein complex with a previously uncharacterised transmembrane protein (Golgi Protein 2, GP2); the complex localises to the cis-Golgi throughout the erythrocytic cycle and potentially during mosquito stages. Conditional repression of GP1 expression and/or inactivation of GP2 revealed that the complex is not essential for any life cycle stage but is important for optimal asexual blood-stage development.\",\n      \"method\": \"Co-immunoprecipitation / complex identification; conditional knockdown of GP1; GP2 gene knockout; fluorescence localization across life cycle stages\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal complex identification, conditional knockdown, gene knockout with defined phenotypic readout, multiple orthogonal methods in one study\",\n      \"pmids\": [\"29579782\"],\n      \"is_preprint\": false,\n      \"attribution\": [\n        {\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}\n      ]\n    }\n  ],\n  \"current_model\": \"GP1 (PF3D7_1320000) is a P. falciparum cis-Golgi resident protein that forms a stable complex with a transmembrane partner (GP2) throughout the asexual erythrocytic cycle; the complex is not essential for parasite viability but is required for optimal asexual blood-stage development, and GP1 remains Golgi-associated and is not secreted during merozoite invasion.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"GP1 (PF3D7_1320000) is a resident Golgi apparatus protein of Plasmodium falciparum that localizes to the Golgi throughout the asexual erythrocytic cycle and is not secreted during merozoite invasion [#0]. GP1 forms a stable protein complex with a transmembrane partner, Golgi Protein 2 (GP2), that localizes specifically to the cis-Golgi across the erythrocytic cycle [#1]. Conditional repression of GP1 together with GP2 inactivation established that this complex is dispensable for every life cycle stage but is required for optimal asexual blood-stage development [#1]. Beyond its Golgi residence and its association with GP2, no molecular activity, substrate, or downstream pathway for GP1 has been characterized in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 2015,\n      \"claim\": \"Establishing the subcellular home of an uncharacterized parasite protein was the first step: GP1 was shown to be a genuine Golgi resident rather than a transiting or secreted factor, fixing where in the secretory system it must act.\",\n      \"evidence\": \"Fluorescence colocalization imaging across the asexual erythrocytic cycle and imaging of invading merozoites in P. falciparum\",\n      \"pmids\": [\n        \"26375591\"\n      ],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No molecular function or biochemical activity assigned to the Golgi localization\",\n        \"Single-lab, single-method localization not corroborated by orthogonal biochemistry\",\n        \"Sub-Golgi compartment (cis vs trans) not resolved at this stage\"\n      ],\n      \"attribution\": [\n        {\n          \"species\": \"Plasmodium falciparum\",\n          \"strain\": \"\"\n        }\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Whether GP1 acts alone or within a complex, and whether it is essential, was resolved by identifying a stable GP1–GP2 cis-Golgi complex and testing its requirement genetically, defining GP1 as a non-essential but growth-optimizing Golgi factor.\",\n      \"evidence\": \"Co-immunoprecipitation/complex identification, conditional knockdown of GP1, GP2 gene knockout, and life-cycle fluorescence localization in P. falciparum\",\n      \"pmids\": [\n        \"29579782\"\n      ],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"The biochemical function of the GP1–GP2 complex remains undefined\",\n        \"The molecular basis of the asexual growth defect upon complex loss is unknown\",\n        \"Whether GP1 has GP2-independent roles was not tested\"\n      ],\n      \"attribution\": [\n        {\n          \"species\": \"Plasmodium falciparum\",\n          \"strain\": \"\"\n        }\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The molecular activity of GP1 at the cis-Golgi and the mechanism by which the GP1–GP2 complex supports optimal asexual development remain unresolved.\",\n      \"evidence\": \"No further mechanistic evidence in the available corpus\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No enzymatic or transport activity identified for GP1\",\n        \"No structural information on the GP1–GP2 complex\",\n        \"Downstream cargo, pathway, or process affected by the complex is uncharacterized\"\n      ],\n      \"attribution\": [\n        {\n          \"species\": \"Plasmodium falciparum\",\n          \"strain\": \"\"\n        }\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [],\n    \"localization\": [\n      {\n        \"term_id\": \"GO:0005794\",\n        \"supporting_discovery_ids\": [0, 1]\n      },\n      {\n        \"term_id\": \"GO:0005801\",\n        \"supporting_discovery_ids\": [1]\n      }\n    ],\n    \"pathway\": [],\n    \"complexes\": [\n      \"GP1–GP2 cis-Golgi complex\"\n    ],\n    \"partners\": [\n      \"GP2 (Golgi Protein 2, transmembrane partner)\"\n    ],\n    \"other_free_text\": [\n      \"Resident Golgi protein present throughout the asexual erythrocytic cycle and not secreted during merozoite invasion [#0].\",\n      \"The GP1-containing complex is dispensable for all life cycle stages but required for optimal asexual blood-stage development [#1].\"\n    ]\n  }\n}","audit_flag":null,"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_1320000","name":null,"product":"golgi protein 1","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PbANKA","gene_id":"PBANKA_1418300","name":null,"product":"golgi protein 1, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_1420600","name":null,"product":"golgi protein 1, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"GP1","evaluation":null}