{"gene":"PF3D7_1436200","run_date":"2026-09-08T19:44:17","timeline":{"discoveries":[{"year":2019,"finding":"BCP1 (PF3D7_1436200) was identified as a component of the basal complex of P. falciparum through biochemical evaluation (co-immunoprecipitation) of the PfCINCH-containing complex, establishing it as a previously undescribed basal complex protein.","method":"Co-immunoprecipitation / biochemical pulldown of PfCINCH-containing complex","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — reciprocal co-IP reported in a single lab; BCP1 identity as a basal complex component confirmed by the pulldown but no further functional characterisation of BCP1 itself was performed","pmids":["31097714"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2021,"finding":"BCP1 (PF3D7_1436200) localises to the basal complex at the leading edge of the inner membrane complex during schizogony in P. falciparum, as demonstrated by immunofluorescence microscopy including Airyscan super-resolution imaging; this localisation is maintained even after inducible knockout of PfMORN1.","method":"Immunofluorescence microscopy (Airyscan super-resolution) with anti-BCP1 antisera; co-localisation with PfMORN1 and other basal complex markers","journal":"mSphere","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct localization by immunofluorescence replicated across multiple papers (31097714, 34878291, 37400439) using anti-BCP1 antisera; no functional loss-of-function experiment on BCP1 itself reported","pmids":["34878291","31097714","37400439"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":"3D7"}]},{"year":2022,"finding":"BCP1 (PF3D7_1436200) is not detected by immunofluorescence during gametocytogenesis in P. falciparum, in contrast to PfCINCH, indicating that BCP1 expression or localisation is restricted to the asexual blood-stage basal complex and is absent from the transmission-stage IMC expansion machinery.","method":"Immunofluorescence microscopy with anti-BCP1 antisera across gametocyte stages I–V","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single-lab negative localization result (BCP1 not detected in gametocytes); single method, no functional follow-up","pmids":["35972967"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2023,"finding":"BCP1 (PF3D7_1436200) co-localises with PfPPP8 by immunofluorescence, confirming BCP1 as a bona fide basal complex marker used to validate the basal complex identity of newly identified proteins in P. falciparum.","method":"Immunofluorescence co-localisation of PfPPP8-smV5 with anti-BCP1 antisera","journal":"Nature communications","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single co-localisation experiment, single lab; used as a reference marker rather than providing new mechanistic insight into BCP1 itself","pmids":["37400439"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":"3D7"}]}],"current_model":"BCP1 (PF3D7_1436200) is a P. falciparum-specific basal complex protein identified by co-immunoprecipitation with PfCINCH that localises to the leading edge of the inner membrane complex during asexual schizogony; beyond its membership in the basal complex and its absence from gametocytes, no direct functional or mechanistic role for BCP1 itself has been experimentally established."},"narrative":{"mechanistic_narrative":"BCP1 (PF3D7_1436200) is a Plasmodium falciparum basal complex protein first identified through co-immunoprecipitation of the PfCINCH-containing complex, establishing it as a previously undescribed member of the asexual schizont basal complex [PMID:31097714]. By immunofluorescence, including Airyscan super-resolution imaging, BCP1 localises to the basal complex at the leading edge of the inner membrane complex during schizogony, and this localisation persists after inducible knockout of PfMORN1 [PMID:34878291, PMID:31097714, PMID:37400439]. Its consistent co-localisation with basal complex markers has made BCP1 a reference marker for validating the basal complex identity of other proteins [PMID:34878291, PMID:31097714, PMID:37400439]. Beyond its membership in the basal complex, its restriction to the asexual blood stage, and its localisation behaviour, no direct loss-of-function or biochemical role for BCP1 itself has been characterized in the available corpus.","teleology":[{"year":2019,"claim":"Before this work the protein composition of the P. falciparum basal complex was incompletely defined; pulling down the PfCINCH complex established BCP1 as a bona fide basal complex component.","evidence":"Co-immunoprecipitation / biochemical pulldown of the PfCINCH-containing complex","pmids":["31097714"],"confidence":"Medium","gaps":["Reciprocal co-IP from a single lab only","No functional characterisation of BCP1 itself","Direct binding partner within the complex not resolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2021,"claim":"It was unknown where BCP1 sits within the dividing schizont and whether its recruitment depends on other basal complex proteins; imaging placed it at the leading edge of the IMC and showed its localisation is independent of PfMORN1.","evidence":"Immunofluorescence including Airyscan super-resolution with anti-BCP1 antisera, plus inducible PfMORN1 knockout","pmids":["34878291","31097714","37400439"],"confidence":"Medium","gaps":["Determinants of BCP1 recruitment to the basal complex unknown","No loss-of-function experiment on BCP1 itself","Role in basal complex constriction untested"],"attribution":[{"species":"Plasmodium falciparum","strain":"3D7"}]},{"year":2022,"claim":"Whether BCP1 functions in the transmission stage was open; its absence from gametocytes indicates its role is restricted to the asexual blood-stage basal complex rather than transmission-stage IMC expansion.","evidence":"Immunofluorescence with anti-BCP1 antisera across gametocyte stages I–V","pmids":["35972967"],"confidence":"Low","gaps":["Single-lab negative immunofluorescence result","Absence not confirmed by orthogonal method (e.g. transcriptomics or tagging)","Functional consequence of stage restriction untested"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2023,"claim":"BCP1's reliability as a spatial reference was leveraged, with co-localisation with PfPPP8 confirming its use as a basal complex marker for validating newly identified proteins.","evidence":"Immunofluorescence co-localisation of PfPPP8-smV5 with anti-BCP1 antisera","pmids":["37400439"],"confidence":"Low","gaps":["Single co-localisation experiment","Provides no new mechanistic insight into BCP1's own function","No physical interaction with PfPPP8 tested"],"attribution":[{"species":"Plasmodium falciparum","strain":"3D7"}]},{"year":null,"claim":"The molecular function of BCP1 within the basal complex remains undefined: no loss-of-function phenotype, enzymatic activity, or direct binding partner has been established.","evidence":"","pmids":[],"confidence":"Low","gaps":["No inducible knockout/knockdown of BCP1 itself","No structural or biochemical activity assigned","Direct molecular partners within the complex unresolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":["basal complex (PfCINCH-containing complex)"],"partners":["PFCINCH (CO-IMMUNOPRECIPITATION)","PFMORN1 (CO-LOCALISATION; BCP1 LOCALISATION INDEPENDENT OF PFMORN1)","PFPPP8 (CO-LOCALISATION)"],"other_free_text":["P. falciparum-specific basal complex protein identified by PfCINCH pulldown [#0]","Localises to the leading edge of the IMC during schizogony; localisation maintained after inducible PfMORN1 knockout [#1]","Not detected in gametocytes, indicating restriction to the asexual blood-stage basal complex [#2]","Used as a reference marker to validate basal complex identity of other proteins [#3]","No direct functional or enzymatic role for BCP1 itself established in the available corpus"]}},"prefetch_data":{},"corpus_meta":[{"pmid":"31097714","id":"PMC_31097714","title":"An essential contractile ring protein controls cell division in Plasmodium falciparum.","date":"2019","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/31097714","citation_count":62,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["curated_ref"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"37400439","id":"","title":"A PPP-type pseudophosphatase is required for the maintenance of basal complex integrity in Plasmodium falciparum.","date":"2023","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/37400439","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["BCP1"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"34878291","id":"","title":"The Basal Complex Protein PfMORN1 Is Not Required for Asexual Replication of Plasmodium falciparum.","date":"2021","source":"mSphere","url":"https://pubmed.ncbi.nlm.nih.gov/34878291","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["BCP1"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"35972967","id":"","title":"Identification of basal complex protein that is essential for maturation of transmission-stage malaria parasites.","date":"2022","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/35972967","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["BCP1"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"35775739","id":"","title":"Inner membrane complex proteomics reveals a palmitoylation regulation critical for intraerythrocytic development of malaria parasite.","date":"2022","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/35775739","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["BCP1"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"33489940","id":"","title":"The Dynamic Roles of the Inner Membrane Complex in the Multiple Stages of the Malaria Parasite.","date":"2021","source":"Frontiers in cellular and infection microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/33489940","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["BCP1"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"33954122","id":"","title":"The Ringleaders: Understanding the Apicomplexan Basal Complex Through Comparison to Established Contractile Ring Systems.","date":"2021","source":"Frontiers in cellular and infection microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/33954122","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["BCP1"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"31824870","id":"","title":"Who Needs a Contractile Actomyosin Ring? The Plethora of Alternative Ways to Divide a Protozoan Parasite.","date":"2019","source":"Frontiers in cellular and infection microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/31824870","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["BCP1"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":11080,"output_tokens":1199,"usd":0.025612,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":5967,"output_tokens":2057,"usd":0.04063,"stage2_stop_reason":"end_turn"},"total_usd":0.066242,"stage1_batch_id":"msgbatch_01SRp5hyRc82zNjddxyCCXGk","stage2_batch_id":"msgbatch_01K3BTmBazRo3pRrMvyaPMTY","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2019,\n      \"finding\": \"BCP1 (PF3D7_1436200) was identified as a component of the basal complex of P. falciparum through biochemical evaluation (co-immunoprecipitation) of the PfCINCH-containing complex, establishing it as a previously undescribed basal complex protein.\",\n      \"method\": \"Co-immunoprecipitation / biochemical pulldown of PfCINCH-containing complex\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — reciprocal co-IP reported in a single lab; BCP1 identity as a basal complex component confirmed by the pulldown but no further functional characterisation of BCP1 itself was performed\",\n      \"pmids\": [\"31097714\"],\n      \"is_preprint\": false,\n      \"attribution\": [\n        {\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"BCP1 (PF3D7_1436200) localises to the basal complex at the leading edge of the inner membrane complex during schizogony in P. falciparum, as demonstrated by immunofluorescence microscopy including Airyscan super-resolution imaging; this localisation is maintained even after inducible knockout of PfMORN1.\",\n      \"method\": \"Immunofluorescence microscopy (Airyscan super-resolution) with anti-BCP1 antisera; co-localisation with PfMORN1 and other basal complex markers\",\n      \"journal\": \"mSphere\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct localization by immunofluorescence replicated across multiple papers (31097714, 34878291, 37400439) using anti-BCP1 antisera; no functional loss-of-function experiment on BCP1 itself reported\",\n      \"pmids\": [\"34878291\", \"31097714\", \"37400439\"],\n      \"is_preprint\": false,\n      \"attribution\": [\n        {\"species\": \"Plasmodium falciparum\", \"strain\": \"3D7\"}\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"BCP1 (PF3D7_1436200) is not detected by immunofluorescence during gametocytogenesis in P. falciparum, in contrast to PfCINCH, indicating that BCP1 expression or localisation is restricted to the asexual blood-stage basal complex and is absent from the transmission-stage IMC expansion machinery.\",\n      \"method\": \"Immunofluorescence microscopy with anti-BCP1 antisera across gametocyte stages I–V\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single-lab negative localization result (BCP1 not detected in gametocytes); single method, no functional follow-up\",\n      \"pmids\": [\"35972967\"],\n      \"is_preprint\": false,\n      \"attribution\": [\n        {\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"BCP1 (PF3D7_1436200) co-localises with PfPPP8 by immunofluorescence, confirming BCP1 as a bona fide basal complex marker used to validate the basal complex identity of newly identified proteins in P. falciparum.\",\n      \"method\": \"Immunofluorescence co-localisation of PfPPP8-smV5 with anti-BCP1 antisera\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single co-localisation experiment, single lab; used as a reference marker rather than providing new mechanistic insight into BCP1 itself\",\n      \"pmids\": [\"37400439\"],\n      \"is_preprint\": false,\n      \"attribution\": [\n        {\"species\": \"Plasmodium falciparum\", \"strain\": \"3D7\"}\n      ]\n    }\n  ],\n  \"current_model\": \"BCP1 (PF3D7_1436200) is a P. falciparum-specific basal complex protein identified by co-immunoprecipitation with PfCINCH that localises to the leading edge of the inner membrane complex during asexual schizogony; beyond its membership in the basal complex and its absence from gametocytes, no direct functional or mechanistic role for BCP1 itself has been experimentally established.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"BCP1 (PF3D7_1436200) is a Plasmodium falciparum basal complex protein first identified through co-immunoprecipitation of the PfCINCH-containing complex, establishing it as a previously undescribed member of the asexual schizont basal complex [#0]. By immunofluorescence, including Airyscan super-resolution imaging, BCP1 localises to the basal complex at the leading edge of the inner membrane complex during schizogony, and this localisation persists after inducible knockout of PfMORN1 [#1]. Its consistent co-localisation with basal complex markers has made BCP1 a reference marker for validating the basal complex identity of other proteins [#1, #3]. Beyond its membership in the basal complex, its restriction to the asexual blood stage, and its localisation behaviour, no direct loss-of-function or biochemical role for BCP1 itself has been characterized in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 2019,\n      \"claim\": \"Before this work the protein composition of the P. falciparum basal complex was incompletely defined; pulling down the PfCINCH complex established BCP1 as a bona fide basal complex component.\",\n      \"evidence\": \"Co-immunoprecipitation / biochemical pulldown of the PfCINCH-containing complex\",\n      \"pmids\": [\"31097714\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Reciprocal co-IP from a single lab only\", \"No functional characterisation of BCP1 itself\", \"Direct binding partner within the complex not resolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"It was unknown where BCP1 sits within the dividing schizont and whether its recruitment depends on other basal complex proteins; imaging placed it at the leading edge of the IMC and showed its localisation is independent of PfMORN1.\",\n      \"evidence\": \"Immunofluorescence including Airyscan super-resolution with anti-BCP1 antisera, plus inducible PfMORN1 knockout\",\n      \"pmids\": [\"34878291\", \"31097714\", \"37400439\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Determinants of BCP1 recruitment to the basal complex unknown\", \"No loss-of-function experiment on BCP1 itself\", \"Role in basal complex constriction untested\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"3D7\"}]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Whether BCP1 functions in the transmission stage was open; its absence from gametocytes indicates its role is restricted to the asexual blood-stage basal complex rather than transmission-stage IMC expansion.\",\n      \"evidence\": \"Immunofluorescence with anti-BCP1 antisera across gametocyte stages I\\u2013V\",\n      \"pmids\": [\"35972967\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single-lab negative immunofluorescence result\", \"Absence not confirmed by orthogonal method (e.g. transcriptomics or tagging)\", \"Functional consequence of stage restriction untested\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"BCP1's reliability as a spatial reference was leveraged, with co-localisation with PfPPP8 confirming its use as a basal complex marker for validating newly identified proteins.\",\n      \"evidence\": \"Immunofluorescence co-localisation of PfPPP8-smV5 with anti-BCP1 antisera\",\n      \"pmids\": [\"37400439\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single co-localisation experiment\", \"Provides no new mechanistic insight into BCP1's own function\", \"No physical interaction with PfPPP8 tested\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"3D7\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The molecular function of BCP1 within the basal complex remains undefined: no loss-of-function phenotype, enzymatic activity, or direct binding partner has been established.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No inducible knockout/knockdown of BCP1 itself\", \"No structural or biochemical activity assigned\", \"Direct molecular partners within the complex unresolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [],\n    \"localization\": [\n      {\"term_id\": \"basal complex\", \"supporting_discovery_ids\": [0, 1, 3]},\n      {\"term_id\": \"inner membrane complex leading edge\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"schizogony / asexual blood-stage division\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"complexes\": [\"basal complex (PfCINCH-containing complex)\"],\n    \"partners\": [\"PfCINCH (co-immunoprecipitation)\", \"PfMORN1 (co-localisation; BCP1 localisation independent of PfMORN1)\", \"PfPPP8 (co-localisation)\"],\n    \"other_free_text\": [\n      \"P. falciparum-specific basal complex protein identified by PfCINCH pulldown [#0]\",\n      \"Localises to the leading edge of the IMC during schizogony; localisation maintained after inducible PfMORN1 knockout [#1]\",\n      \"Not detected in gametocytes, indicating restriction to the asexual blood-stage basal complex [#2]\",\n      \"Used as a reference marker to validate basal complex identity of other proteins [#3]\",\n      \"No direct functional or enzymatic role for BCP1 itself established in the available corpus\"\n    ]\n  }\n}","audit_flag":null,"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_1436200","name":null,"product":"basal complex protein BCP1","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_0422800","name":null,"product":"basal complex protein BCP1, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"BCP1","evaluation":null}