{"gene":"PF3D7_0903800","run_date":"2026-09-08T12:51:27","timeline":{"discoveries":[{"year":2007,"finding":"CCp4 (PfCCp4) is expressed on the surface of both male and female gametocytes and macrogametes (stages II–V of gametocytogenesis and early gamete formation) but is absent from exflagellating microgametes. CCp4 co-localizes with the transmission-blocking candidate Pfs230 and forms a protein complex with it. Targeted gene disruption of CCp4 does not inhibit parasite development in the mosquito vector, indicating a non-essential role during parasite transmission.","method":"Immunofluorescence assay (surface localization), co-immunoprecipitation (complex with Pfs230), targeted gene disruption with mosquito transmission phenotyping","journal":"International journal for parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP and direct localization with functional KO phenotyping, single lab, multiple orthogonal methods","pmids":["17950739"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2009,"finding":"CCp4 (PfCCp4) participates in multi-protein complexes (MPCs) with all other PfCCp family members in gametocyte lysates. Co-immunoprecipitation on gametocyte lysates demonstrated complex formation involving all six PfCCp proteins, and affinity chromatography co-elution binding assays with recombinant PfCCp domains indicated direct binding between distinct adhesion domains. Lack of one PfCCp protein leads to loss of other family members at the protein (but not mRNA) level.","method":"Co-immunoprecipitation on gametocyte lysates; affinity chromatography co-elution with recombinant domains; gene-disruptant parasite lines (five lines)","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP and in vitro binding assays with recombinant domains, single lab, multiple orthogonal methods","pmids":["19304662"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2015,"finding":"CCp4 (as part of PfCCp-based multi-protein complexes) is linked to the gametocyte plasma membrane via interactions with Pfs230, which itself binds GPI-anchored Pfs48/45. Upon gametogenesis (following mosquito uptake), GPI-anchored Pfs25 joins the MPC. Cleavage of Pfs230 at its N-terminal site upon gametogenesis increases its interaction with the MPC; loss of Pfs230 or impaired Pfs230 processing causes proteolysis of PfCCp proteins and their release from the MPC.","method":"Co-immunoprecipitation; immunofluorescence; gene-disruptant parasite analysis; biochemical fractionation","journal":"Parasitology international","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and genetic KO lines with defined molecular phenotype, single lab, multiple orthogonal methods; CCp4 is implicated as part of the MPC but specific CCp4 interactions are not individually resolved in this study","pmids":["26408859"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2022,"finding":"Knockdown of the WD40-repeat protein PfWLP1 leads to reduced protein levels of PfCCp1 and PfCCp2 (key components of the PfCCp adhesion complex that includes CCp4), impaired gametocyte exflagellation, and reduced gametocyte numbers, indicating that PfWLP1 interaction with the PfCCp-based adhesion complex ensures complex stability.","method":"Reverse genetics (knockdown); immunofluorescence; protein level quantification","journal":"Frontiers in cellular and infection microbiology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, knockdown with protein-level phenotype; CCp4 is a member of the complex whose stability is affected but direct CCp4-PfWLP1 interaction is not individually established in this abstract","pmids":["35923798"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2007,"finding":"CCp4's P. berghei ortholog (PbLAP4) is critical for oocyst maturation and sporozoite formation; PbLAP4 null mutants fail to produce sporozoites and are not transmissible from mosquitoes to mice. The lethal sporozoite-formation phenotype is rescued only when the wild-type pblap4 allele is inherited from a female gametocyte, demonstrating that the relevant function is required before expression of the male-derived gene (i.e., in the gametocyte-to-ookinete period).","method":"Targeted gene disruption (loss-of-function mutant); genetic cross with wild-type, female-deficient (Δpbs47) and male-deficient (Δpbs48/45) parasites; mosquito transmission assay","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with defined cellular phenotype replicated across multiple genetic cross experiments, epistasis established by sex-specific complementation","pmids":["17335349"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2013,"finding":"CCp4's P. berghei ortholog (PbLAP4), like other LAP family members, localizes to the crystalloid organelle in ookinetes, as shown by GFP tagging. Unlike PbLAP1/2/3 which are expressed in gametocytes, PbLAP4 protein expression is not detected in gametocytes despite prominent transcription of the gene in sexual blood stages, indicating that translational repression controls its expression.","method":"GFP tagging and fluorescence microscopy; RT-PCR for transcript detection; Western blot for protein expression","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct GFP-based localization combined with transcriptional and protein-level analyses, single lab, multiple orthogonal methods","pmids":["23684590"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2017,"finding":"CCp4's P. berghei ortholog (PbLAP4) is recruited to the LAP1/LAP2/LAP3 complex after fertilization. LAP1 facilitates recruitment of LAP4, LAP5, and LAP6 to the pre-formed LAP1/2/3 complex chiefly through LAP1's scavenger receptor cysteine-rich (SRCR) modules, as determined by affinity purification and quantitative mass spectrometry of reporter-tagged LAPs.","method":"Affinity purification of reporter-tagged LAPs combined with high-accuracy label-free quantitative mass spectrometry; transgenic parasite lines","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — affinity purification-MS with domain-level mechanistic detail, single lab, two orthogonal approaches (AP-MS + transgenic lines)","pmids":["28414172"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2018,"finding":"A PbLAP4 mutant (corresponding to CCp4 ortholog in P. berghei) with abnormal crystalloid biogenesis produces oocysts with reduced growth and premature sporogony, providing evidence that the LAP complex (including PbLAP4) regulates oocyst cell division via the crystalloid.","method":"Targeted mutagenesis; microscopic phenotypic analysis of oocyst growth and sporozoite formation in transgenic P. berghei","journal":"International journal for parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean mutant with defined cellular phenotypes (crystalloid biogenesis and cell division), single lab","pmids":["30367865"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2020,"finding":"CCp4's P. berghei ortholog (PbLAP4) is part of an extended LAP interactome of approximately fifty proteins identified by GFP-affinity pulldown of LAP3 combined with high-accuracy mass spectrometry; many of these interact proteins are also targeted to the crystalloid, indicating that the LAP complex (including PbLAP4) forms an intricate molecular assembly that facilitates crystalloid targeting and biogenesis.","method":"GFP affinity pulldown; high-accuracy mass spectrometry; fluorescence microscopy of crystalloid-targeted proteins in transgenic parasites","journal":"Journal of proteomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — AP-MS interactome with functional localization follow-up, single lab, two orthogonal methods; CCp4/LAP4 is a complex member but its individual interactions are not separately resolved","pmids":["32736136"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":""}]}],"current_model":"CCp4 (PF3D7_0903800) is a multi-domain LCCL-containing adhesion protein expressed specifically during gametocytogenesis (stages II–V) and early gamete formation in P. falciparum, where it localizes to the gametocyte surface, forms a protein complex with Pfs230 and participates in larger PfCCp multi-protein complexes anchored to the plasma membrane; its P. berghei ortholog (PbLAP4) undergoes translational repression in gametocytes, is recruited post-fertilization to the LAP complex via LAP1's SRCR modules, localizes to the crystalloid organelle in ookinetes, and is essential for crystalloid biogenesis, oocyst cell-cycle regulation, and sporozoite formation required for mosquito-to-vertebrate transmission, while targeted disruption of CCp4 itself in P. falciparum does not block mosquito transmission."},"narrative":{"mechanistic_narrative":"CCp4 (PF3D7_0903800) is a multi-domain LCCL-domain adhesion protein of Plasmodium that functions within sexual-stage protein complexes required for parasite transmission through the mosquito [PMID:17950739, PMID:19304662]. In P. falciparum, CCp4 is expressed on the surface of male and female gametocytes and macrogametes across gametocytogenesis stages II–V but is absent from exflagellating microgametes, and it co-localizes and forms a complex with the transmission-blocking antigen Pfs230 [PMID:17950739]. It participates in larger PfCCp multi-protein complexes together with all other PfCCp family members, whose mutual stability is interdependent: loss of one member causes loss of the others at the protein but not mRNA level [PMID:19304662]. These complexes are tethered to the gametocyte plasma membrane via Pfs230, which links to GPI-anchored Pfs48/45, and Pfs230 processing upon gametogenesis modulates complex association; disruption of Pfs230 causes proteolysis and release of the PfCCp proteins [PMID:26408859]. Targeted disruption of CCp4 in P. falciparum does not block mosquito transmission [PMID:17950739]. The P. berghei ortholog (PbLAP4) diverges functionally: it is translationally repressed in gametocytes, recruited post-fertilization to a pre-formed LAP1/2/3 complex through the SRCR modules of LAP1, localizes to the crystalloid organelle in ookinetes, and is essential for crystalloid biogenesis, oocyst cell-cycle regulation and sporozoite formation required for transmission [PMID:17335349, PMID:23684590, PMID:28414172, PMID:30367865].","teleology":[{"year":2007,"claim":"Establishing when and where CCp4 acts and what it partners with was the first step in defining a sexual-stage adhesion protein; localization and interaction data placed it on the gametocyte surface in complex with a leading transmission-blocking antigen.","evidence":"Immunofluorescence surface localization, reciprocal Co-IP with Pfs230, and targeted gene disruption with mosquito transmission phenotyping in P. falciparum","pmids":["17950739"],"confidence":"Medium","gaps":["Whether CCp4's binding to Pfs230 is direct or bridged is not resolved","Molecular function of the LCCL domains is not defined","Non-essential transmission phenotype leaves the biological purpose of CCp4 in P. falciparum unexplained"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2009,"claim":"The question of whether CCp4 acts alone or within a family assembly was answered by showing it is embedded in interdependent PfCCp multi-protein complexes, reframing CCp4 as one node in a co-stabilized network.","evidence":"Co-IP on gametocyte lysates, affinity-chromatography co-elution with recombinant adhesion domains, and five gene-disruptant lines in P. falciparum","pmids":["19304662"],"confidence":"Medium","gaps":["Which specific domains of CCp4 mediate its binding partners is not individually mapped","Stoichiometry and architecture of the complex are unknown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2015,"claim":"How the PfCCp complex is anchored and dynamically regulated was addressed by tracing membrane tethering through Pfs230/Pfs48/45 and showing that Pfs230 processing controls complex integrity, positioning CCp4-containing complexes for regulated assembly at gametogenesis.","evidence":"Co-IP, immunofluorescence, biochemical fractionation, and gene-disruptant analysis in P. falciparum","pmids":["26408859"],"confidence":"Medium","gaps":["Specific CCp4 interactions within the MPC are not individually resolved","Functional consequence of complex release for CCp4 is unknown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2007,"claim":"Whether the ortholog carries an essential transmission function was answered in P. berghei, where PbLAP4 is required for sporozoite formation and its function acts maternally before male-gene expression, establishing an essential pre-ookinete role that contrasts with the dispensable P. falciparum CCp4.","evidence":"Targeted gene disruption and genetic crosses with sex-specific mutants plus mosquito transmission assays in P. berghei","pmids":["17335349"],"confidence":"High","gaps":["Molecular mechanism of the sporozoite-formation defect is not defined here","Reason for species divergence in essentiality versus P. falciparum CCp4 is unexplained"],"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2013,"claim":"The subcellular site and expression timing of the ortholog were clarified by showing PbLAP4 localizes to the ookinete crystalloid and is translationally repressed in gametocytes despite active transcription, connecting its essential function to a specific organelle and a post-transcriptional control point.","evidence":"GFP tagging with fluorescence microscopy, RT-PCR, and Western blot in P. berghei","pmids":["23684590"],"confidence":"Medium","gaps":["Mechanism of translational repression is not identified","Whether P. falciparum CCp4 undergoes similar regulation is not tested"],"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2017,"claim":"How PbLAP4 joins the LAP assembly was resolved by showing it is recruited post-fertilization to a pre-formed LAP1/2/3 core via LAP1's SRCR modules, defining the assembly hierarchy and the domains driving recruitment.","evidence":"Affinity purification of reporter-tagged LAPs with label-free quantitative mass spectrometry in transgenic P. berghei","pmids":["28414172"],"confidence":"Medium","gaps":["Direct SRCR–LAP4 contact is inferred from AP-MS, not structurally demonstrated","Timing signal triggering recruitment is unknown"],"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2018,"claim":"The downstream physiological role was addressed by linking a PbLAP4 crystalloid-biogenesis defect to reduced oocyst growth and premature sporogony, establishing that the LAP complex regulates oocyst cell division through the crystalloid.","evidence":"Targeted mutagenesis and microscopic phenotyping of oocyst growth and sporozoite formation in transgenic P. berghei","pmids":["30367865"],"confidence":"Medium","gaps":["How crystalloid integrity controls the cell cycle is not mechanistically defined","CCp4-specific contribution versus other LAP members is not isolated"],"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2020,"claim":"The scale of the assembly was mapped by defining an extended ~50-protein LAP interactome, many members crystalloid-targeted, showing PbLAP4 sits within an intricate machine facilitating crystalloid targeting and biogenesis.","evidence":"GFP-affinity pulldown of LAP3 with high-accuracy mass spectrometry and crystalloid-localization microscopy in P. berghei","pmids":["32736136"],"confidence":"Medium","gaps":["Individual PbLAP4 interactions are not separately resolved within the interactome","Functional roles of most interactors are undefined"],"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2022,"claim":"Additional stabilizing factors for the P. falciparum PfCCp complex were probed by showing PfWLP1 knockdown reduces PfCCp1/PfCCp2 levels and impairs exflagellation, implicating a WD40 protein in complex stability.","evidence":"Reverse-genetic knockdown with immunofluorescence and protein-level quantification in P. falciparum","pmids":["35923798"],"confidence":"Low","gaps":["Direct CCp4–PfWLP1 interaction is not established","Effect on CCp4 protein levels specifically is not measured"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":null,"claim":"The molecular activity of CCp4's LCCL and adhesion domains, the structural basis of its complex interactions, and the reason for the divergent essentiality between P. falciparum CCp4 and P. berghei PbLAP4 remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No biochemical activity or ligand assigned to CCp4 domains","No structural model of the PfCCp complex","Species divergence in transmission essentiality unexplained"],"attribution":[]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":["PfCCp multi-protein complex (PfCCp1-6)","Pfs230/Pfs48/45/Pfs25-anchored gametocyte surface complex","LAP1/LAP2/LAP3/LAP4/LAP5/LAP6 (LAP) complex in P. berghei"],"partners":["PFS230 (P. FALCIPARUM)","OTHER PFCCP FAMILY MEMBERS (P. FALCIPARUM)","PFS48/45, PFS25 (VIA PFS230, P. FALCIPARUM)","PFWLP1 (COMPLEX-LEVEL, P. FALCIPARUM)","PBLAP1/LAP2/LAP3 VIA LAP1 SRCR MODULES (P. BERGHEI)"],"other_free_text":["P. berghei ortholog PbLAP4 is translationally repressed in gametocytes and recruited to the LAP complex only after fertilization.","Targeted disruption of CCp4 in P. falciparum does not block mosquito transmission, whereas PbLAP4 is essential for sporozoite formation and transmission in P. berghei.","PbLAP4 is required for crystalloid biogenesis and regulation of oocyst cell division/sporogony."]}},"prefetch_data":{},"corpus_meta":[{"pmid":"12354219","id":"PMC_12354219","title":"A malaria scavenger receptor-like protein essential for parasite development.","date":"2002","source":"Molecular microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/12354219","citation_count":75,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["LCCL"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"17950739","id":"PMC_17950739","title":"PfCCp proteins of Plasmodium falciparum: gametocyte-specific 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chemotherapy","url":"https://pubmed.ncbi.nlm.nih.gov/40405864","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["PfCCp4"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"42684939","id":"PMC_42684939","title":"Persistence of Plasmodium falciparum DNA detection after antimalarial treatment and the implication of gametocytes: a prospective cohort study in a non-endemic setting.","date":"2026","source":"Microbiology spectrum","url":"https://pubmed.ncbi.nlm.nih.gov/42684939","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["PfCCp4"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":14701,"output_tokens":2911,"usd":0.043884,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8532,"output_tokens":4075,"usd":0.072267,"stage2_stop_reason":"end_turn"},"total_usd":0.116151,"stage1_batch_id":"msgbatch_01DisAaTypwmC8QwdMBuePHo","stage2_batch_id":"msgbatch_0184zxZTqxiEfdYYfPMfkqjb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2007,\n      \"finding\": \"CCp4 (PfCCp4) is expressed on the surface of both male and female gametocytes and macrogametes (stages II–V of gametocytogenesis and early gamete formation) but is absent from exflagellating microgametes. CCp4 co-localizes with the transmission-blocking candidate Pfs230 and forms a protein complex with it. Targeted gene disruption of CCp4 does not inhibit parasite development in the mosquito vector, indicating a non-essential role during parasite transmission.\",\n      \"method\": \"Immunofluorescence assay (surface localization), co-immunoprecipitation (complex with Pfs230), targeted gene disruption with mosquito transmission phenotyping\",\n      \"journal\": \"International journal for parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP and direct localization with functional KO phenotyping, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"17950739\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CCp4 (PfCCp4) participates in multi-protein complexes (MPCs) with all other PfCCp family members in gametocyte lysates. Co-immunoprecipitation on gametocyte lysates demonstrated complex formation involving all six PfCCp proteins, and affinity chromatography co-elution binding assays with recombinant PfCCp domains indicated direct binding between distinct adhesion domains. Lack of one PfCCp protein leads to loss of other family members at the protein (but not mRNA) level.\",\n      \"method\": \"Co-immunoprecipitation on gametocyte lysates; affinity chromatography co-elution with recombinant domains; gene-disruptant parasite lines (five lines)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP and in vitro binding assays with recombinant domains, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"19304662\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CCp4 (as part of PfCCp-based multi-protein complexes) is linked to the gametocyte plasma membrane via interactions with Pfs230, which itself binds GPI-anchored Pfs48/45. Upon gametogenesis (following mosquito uptake), GPI-anchored Pfs25 joins the MPC. Cleavage of Pfs230 at its N-terminal site upon gametogenesis increases its interaction with the MPC; loss of Pfs230 or impaired Pfs230 processing causes proteolysis of PfCCp proteins and their release from the MPC.\",\n      \"method\": \"Co-immunoprecipitation; immunofluorescence; gene-disruptant parasite analysis; biochemical fractionation\",\n      \"journal\": \"Parasitology international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and genetic KO lines with defined molecular phenotype, single lab, multiple orthogonal methods; CCp4 is implicated as part of the MPC but specific CCp4 interactions are not individually resolved in this study\",\n      \"pmids\": [\"26408859\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Knockdown of the WD40-repeat protein PfWLP1 leads to reduced protein levels of PfCCp1 and PfCCp2 (key components of the PfCCp adhesion complex that includes CCp4), impaired gametocyte exflagellation, and reduced gametocyte numbers, indicating that PfWLP1 interaction with the PfCCp-based adhesion complex ensures complex stability.\",\n      \"method\": \"Reverse genetics (knockdown); immunofluorescence; protein level quantification\",\n      \"journal\": \"Frontiers in cellular and infection microbiology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, knockdown with protein-level phenotype; CCp4 is a member of the complex whose stability is affected but direct CCp4-PfWLP1 interaction is not individually established in this abstract\",\n      \"pmids\": [\"35923798\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CCp4's P. berghei ortholog (PbLAP4) is critical for oocyst maturation and sporozoite formation; PbLAP4 null mutants fail to produce sporozoites and are not transmissible from mosquitoes to mice. The lethal sporozoite-formation phenotype is rescued only when the wild-type pblap4 allele is inherited from a female gametocyte, demonstrating that the relevant function is required before expression of the male-derived gene (i.e., in the gametocyte-to-ookinete period).\",\n      \"method\": \"Targeted gene disruption (loss-of-function mutant); genetic cross with wild-type, female-deficient (Δpbs47) and male-deficient (Δpbs48/45) parasites; mosquito transmission assay\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with defined cellular phenotype replicated across multiple genetic cross experiments, epistasis established by sex-specific complementation\",\n      \"pmids\": [\"17335349\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CCp4's P. berghei ortholog (PbLAP4), like other LAP family members, localizes to the crystalloid organelle in ookinetes, as shown by GFP tagging. Unlike PbLAP1/2/3 which are expressed in gametocytes, PbLAP4 protein expression is not detected in gametocytes despite prominent transcription of the gene in sexual blood stages, indicating that translational repression controls its expression.\",\n      \"method\": \"GFP tagging and fluorescence microscopy; RT-PCR for transcript detection; Western blot for protein expression\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct GFP-based localization combined with transcriptional and protein-level analyses, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"23684590\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CCp4's P. berghei ortholog (PbLAP4) is recruited to the LAP1/LAP2/LAP3 complex after fertilization. LAP1 facilitates recruitment of LAP4, LAP5, and LAP6 to the pre-formed LAP1/2/3 complex chiefly through LAP1's scavenger receptor cysteine-rich (SRCR) modules, as determined by affinity purification and quantitative mass spectrometry of reporter-tagged LAPs.\",\n      \"method\": \"Affinity purification of reporter-tagged LAPs combined with high-accuracy label-free quantitative mass spectrometry; transgenic parasite lines\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — affinity purification-MS with domain-level mechanistic detail, single lab, two orthogonal approaches (AP-MS + transgenic lines)\",\n      \"pmids\": [\"28414172\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"A PbLAP4 mutant (corresponding to CCp4 ortholog in P. berghei) with abnormal crystalloid biogenesis produces oocysts with reduced growth and premature sporogony, providing evidence that the LAP complex (including PbLAP4) regulates oocyst cell division via the crystalloid.\",\n      \"method\": \"Targeted mutagenesis; microscopic phenotypic analysis of oocyst growth and sporozoite formation in transgenic P. berghei\",\n      \"journal\": \"International journal for parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean mutant with defined cellular phenotypes (crystalloid biogenesis and cell division), single lab\",\n      \"pmids\": [\"30367865\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CCp4's P. berghei ortholog (PbLAP4) is part of an extended LAP interactome of approximately fifty proteins identified by GFP-affinity pulldown of LAP3 combined with high-accuracy mass spectrometry; many of these interact proteins are also targeted to the crystalloid, indicating that the LAP complex (including PbLAP4) forms an intricate molecular assembly that facilitates crystalloid targeting and biogenesis.\",\n      \"method\": \"GFP affinity pulldown; high-accuracy mass spectrometry; fluorescence microscopy of crystalloid-targeted proteins in transgenic parasites\",\n      \"journal\": \"Journal of proteomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — AP-MS interactome with functional localization follow-up, single lab, two orthogonal methods; CCp4/LAP4 is a complex member but its individual interactions are not separately resolved\",\n      \"pmids\": [\"32736136\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    }\n  ],\n  \"current_model\": \"CCp4 (PF3D7_0903800) is a multi-domain LCCL-containing adhesion protein expressed specifically during gametocytogenesis (stages II–V) and early gamete formation in P. falciparum, where it localizes to the gametocyte surface, forms a protein complex with Pfs230 and participates in larger PfCCp multi-protein complexes anchored to the plasma membrane; its P. berghei ortholog (PbLAP4) undergoes translational repression in gametocytes, is recruited post-fertilization to the LAP complex via LAP1's SRCR modules, localizes to the crystalloid organelle in ookinetes, and is essential for crystalloid biogenesis, oocyst cell-cycle regulation, and sporozoite formation required for mosquito-to-vertebrate transmission, while targeted disruption of CCp4 itself in P. falciparum does not block mosquito transmission.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CCp4 (PF3D7_0903800) is a multi-domain LCCL-domain adhesion protein of Plasmodium that functions within sexual-stage protein complexes required for parasite transmission through the mosquito [#0, #1]. In P. falciparum, CCp4 is expressed on the surface of male and female gametocytes and macrogametes across gametocytogenesis stages II\\u2013V but is absent from exflagellating microgametes, and it co-localizes and forms a complex with the transmission-blocking antigen Pfs230 [#0]. It participates in larger PfCCp multi-protein complexes together with all other PfCCp family members, whose mutual stability is interdependent: loss of one member causes loss of the others at the protein but not mRNA level [#1]. These complexes are tethered to the gametocyte plasma membrane via Pfs230, which links to GPI-anchored Pfs48/45, and Pfs230 processing upon gametogenesis modulates complex association; disruption of Pfs230 causes proteolysis and release of the PfCCp proteins [#2]. Targeted disruption of CCp4 in P. falciparum does not block mosquito transmission [#0]. The P. berghei ortholog (PbLAP4) diverges functionally: it is translationally repressed in gametocytes, recruited post-fertilization to a pre-formed LAP1/2/3 complex through the SRCR modules of LAP1, localizes to the crystalloid organelle in ookinetes, and is essential for crystalloid biogenesis, oocyst cell-cycle regulation and sporozoite formation required for transmission [#4, #5, #6, #7].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"Establishing when and where CCp4 acts and what it partners with was the first step in defining a sexual-stage adhesion protein; localization and interaction data placed it on the gametocyte surface in complex with a leading transmission-blocking antigen.\",\n      \"evidence\": \"Immunofluorescence surface localization, reciprocal Co-IP with Pfs230, and targeted gene disruption with mosquito transmission phenotyping in P. falciparum\",\n      \"pmids\": [\"17950739\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether CCp4's binding to Pfs230 is direct or bridged is not resolved\", \"Molecular function of the LCCL domains is not defined\", \"Non-essential transmission phenotype leaves the biological purpose of CCp4 in P. falciparum unexplained\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"The question of whether CCp4 acts alone or within a family assembly was answered by showing it is embedded in interdependent PfCCp multi-protein complexes, reframing CCp4 as one node in a co-stabilized network.\",\n      \"evidence\": \"Co-IP on gametocyte lysates, affinity-chromatography co-elution with recombinant adhesion domains, and five gene-disruptant lines in P. falciparum\",\n      \"pmids\": [\"19304662\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Which specific domains of CCp4 mediate its binding partners is not individually mapped\", \"Stoichiometry and architecture of the complex are unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"How the PfCCp complex is anchored and dynamically regulated was addressed by tracing membrane tethering through Pfs230/Pfs48/45 and showing that Pfs230 processing controls complex integrity, positioning CCp4-containing complexes for regulated assembly at gametogenesis.\",\n      \"evidence\": \"Co-IP, immunofluorescence, biochemical fractionation, and gene-disruptant analysis in P. falciparum\",\n      \"pmids\": [\"26408859\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific CCp4 interactions within the MPC are not individually resolved\", \"Functional consequence of complex release for CCp4 is unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Whether the ortholog carries an essential transmission function was answered in P. berghei, where PbLAP4 is required for sporozoite formation and its function acts maternally before male-gene expression, establishing an essential pre-ookinete role that contrasts with the dispensable P. falciparum CCp4.\",\n      \"evidence\": \"Targeted gene disruption and genetic crosses with sex-specific mutants plus mosquito transmission assays in P. berghei\",\n      \"pmids\": [\"17335349\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism of the sporozoite-formation defect is not defined here\", \"Reason for species divergence in essentiality versus P. falciparum CCp4 is unexplained\"],\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"The subcellular site and expression timing of the ortholog were clarified by showing PbLAP4 localizes to the ookinete crystalloid and is translationally repressed in gametocytes despite active transcription, connecting its essential function to a specific organelle and a post-transcriptional control point.\",\n      \"evidence\": \"GFP tagging with fluorescence microscopy, RT-PCR, and Western blot in P. berghei\",\n      \"pmids\": [\"23684590\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of translational repression is not identified\", \"Whether P. falciparum CCp4 undergoes similar regulation is not tested\"],\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"How PbLAP4 joins the LAP assembly was resolved by showing it is recruited post-fertilization to a pre-formed LAP1/2/3 core via LAP1's SRCR modules, defining the assembly hierarchy and the domains driving recruitment.\",\n      \"evidence\": \"Affinity purification of reporter-tagged LAPs with label-free quantitative mass spectrometry in transgenic P. berghei\",\n      \"pmids\": [\"28414172\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct SRCR\\u2013LAP4 contact is inferred from AP-MS, not structurally demonstrated\", \"Timing signal triggering recruitment is unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"The downstream physiological role was addressed by linking a PbLAP4 crystalloid-biogenesis defect to reduced oocyst growth and premature sporogony, establishing that the LAP complex regulates oocyst cell division through the crystalloid.\",\n      \"evidence\": \"Targeted mutagenesis and microscopic phenotyping of oocyst growth and sporozoite formation in transgenic P. berghei\",\n      \"pmids\": [\"30367865\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How crystalloid integrity controls the cell cycle is not mechanistically defined\", \"CCp4-specific contribution versus other LAP members is not isolated\"],\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"The scale of the assembly was mapped by defining an extended ~50-protein LAP interactome, many members crystalloid-targeted, showing PbLAP4 sits within an intricate machine facilitating crystalloid targeting and biogenesis.\",\n      \"evidence\": \"GFP-affinity pulldown of LAP3 with high-accuracy mass spectrometry and crystalloid-localization microscopy in P. berghei\",\n      \"pmids\": [\"32736136\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Individual PbLAP4 interactions are not separately resolved within the interactome\", \"Functional roles of most interactors are undefined\"],\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Additional stabilizing factors for the P. falciparum PfCCp complex were probed by showing PfWLP1 knockdown reduces PfCCp1/PfCCp2 levels and impairs exflagellation, implicating a WD40 protein in complex stability.\",\n      \"evidence\": \"Reverse-genetic knockdown with immunofluorescence and protein-level quantification in P. falciparum\",\n      \"pmids\": [\"35923798\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Direct CCp4\\u2013PfWLP1 interaction is not established\", \"Effect on CCp4 protein levels specifically is not measured\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The molecular activity of CCp4's LCCL and adhesion domains, the structural basis of its complex interactions, and the reason for the divergent essentiality between P. falciparum CCp4 and P. berghei PbLAP4 remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No biochemical activity or ligand assigned to CCp4 domains\", \"No structural model of the PfCCp complex\", \"Species divergence in transmission essentiality unexplained\"],\n      \"attribution\": []\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005515\", \"supporting_discovery_ids\": [0, 1, 6]},\n      {\"term_id\": \"GO:0050839\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0009986\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0020030\", \"supporting_discovery_ids\": [5, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0019953\", \"supporting_discovery_ids\": [0, 4]},\n      {\"term_id\": \"GO:0060964\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"complexes\": [\n      \"PfCCp multi-protein complex (PfCCp1-6)\",\n      \"Pfs230/Pfs48/45/Pfs25-anchored gametocyte surface complex\",\n      \"LAP1/LAP2/LAP3/LAP4/LAP5/LAP6 (LAP) complex in P. berghei\"\n    ],\n    \"partners\": [\n      \"Pfs230 (P. falciparum)\",\n      \"other PfCCp family members (P. falciparum)\",\n      \"Pfs48/45, Pfs25 (via Pfs230, P. falciparum)\",\n      \"PfWLP1 (complex-level, P. falciparum)\",\n      \"PbLAP1/LAP2/LAP3 via LAP1 SRCR modules (P. berghei)\"\n    ],\n    \"other_free_text\": [\n      \"P. berghei ortholog PbLAP4 is translationally repressed in gametocytes and recruited to the LAP complex only after fertilization.\",\n      \"Targeted disruption of CCp4 in P. falciparum does not block mosquito transmission, whereas PbLAP4 is essential for sporozoite formation and transmission in P. berghei.\",\n      \"PbLAP4 is required for crystalloid biogenesis and regulation of oocyst cell division/sporogony.\"\n    ]\n  }\n}","audit_flag":null,"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_0903800","name":null,"product":"LCCL domain-containing protein","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PbANKA","gene_id":"PBANKA_0417600","name":null,"product":"LCCL domain-containing protein","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_0701500","name":null,"product":"LCCL domain-containing protein","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"CCp4","evaluation":null}