{"gene":"PBANKA_0304900","run_date":"2026-09-07T10:55:50","timeline":{"discoveries":[{"year":2008,"finding":"PBANKA_0304900 (PbSERA3) is transcribed and its protein is processed during late liver stages in P. berghei; immunofluorescence assays using an antiserum against a non-conserved region of PbSERA3 and a transgenic P. berghei strain expressing TAP-tagged PbSERA3 showed that PbSERA3 leaks into the host cell cytoplasm during merozoite development, where it may contribute to host cell death or activate host cell proteases executing cell death. Processed PbSERA3 was detected by Western blot in cell extracts of schizont-infected cells and merozoite-infected detached hepatic cells.","method":"RT-PCR, immunofluorescence assay, Western blot, transgenic parasite expressing TAP-tagged PbSERA3 under endogenous promoter","journal":"Cellular microbiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization by IFA and TAP-tag transgenic line, Western blot processing data, multiple orthogonal methods in single lab","pmids":["18419771"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2026,"finding":"PBANKA_0304900 (PbSERA3) is essential for hepatic merozoite egress in P. berghei: conditional mutants generated using a yeast-based Flp/FRT system invaded hepatocytes and developed normally in late liver stages but failed to initiate blood-stage infection, demonstrating a required role in liver-stage egress. PbSERA3 was also localized on the surface of ookinetes and sporozoites under non-permeabilized conditions, indicating an extracellular presentation at these stages. PbSERA3 is processed in ookinete and sporozoite stages, yielding two proteolytic products consistent with blood-stage processing. PbSERA3 is identified as a substrate of subtilisin-like protease SUB1, and its proteolytic maturation by SUB1 is proposed as a conserved event required for hepatic egress.","method":"Conditional mutagenesis (Flp/FRT system), surface localization by immunofluorescence under non-permeabilized conditions, Western blot of proteolytic processing products","journal":"mBio","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean conditional KO with specific phenotypic readout, surface localization and processing validated by multiple methods, single lab","pmids":["41616267"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":1994,"finding":"SERA3 (in P. falciparum) was identified as a distinct gene located 1.8 kb upstream of SERA on chromosome 2; its direction of transcription was mapped relative to other chromosome 2 genetic markers. SERA3 mRNA is expressed in a stage-specific manner (trophozoite and schizont stages) and is coordinately regulated with neighboring SERA locus genes, implicating a shared transcriptional control mechanism.","method":"Transcript mapping, RNA sequencing, stage-specific RT analysis","journal":"Molecular and biochemical parasitology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, transcript mapping only, no protein-level or functional data for SERA3 specifically","pmids":["7891737"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2002,"finding":"In P. falciparum, SERA3 (chromosome 2 cluster) was targeted for disruption and found to be dispensable for blood-stage erythrocytic growth, in contrast to SERA4–6 which could not be disrupted. Antibodies from malaria-immune individuals reacted with SERA3 recombinant protein, suggesting expression in at least some parasite populations.","method":"Gene disruption by targeted knockout, antibody reactivity assay with recombinant protein, RT-PCR and microarray","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct gene disruption experiment establishing dispensability, replicated across multiple SERA family members in same study as internal controls","pmids":["12228245"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2002,"finding":"In P. falciparum, indirect immunofluorescence microscopy using polyclonal antibodies raised against recombinant N-terminal portions of SERA3–6 detected SERA3 protein expression in trophozoite- and schizont-infected erythrocytes, with similar localization to other SERA family members.","method":"Indirect immunofluorescence microscopy with antigen-specific polyclonal antibodies","journal":"The Journal of biological chemistry","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single localization method, no functional consequence linked, single lab","pmids":["12244052"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"current_model":"PBANKA_0304900 (PbSERA3), a papain-domain-containing serine repeat antigen, is expressed and processed (by subtilisin-like protease SUB1) in multiple Plasmodium life-cycle stages; in P. berghei it is dispensable for blood-stage growth but is required for hepatic merozoite egress, localizes to the surface of ookinetes and sporozoites, and leaks into the hepatocyte cytoplasm during late liver-stage schizogony where it may participate in host cell disruption."},"narrative":{"mechanistic_narrative":"PBANKA_0304900 (SERA3) encodes a papain-domain-containing serine repeat antigen that is expressed, presented at the parasite surface, and proteolytically processed across multiple Plasmodium life-cycle stages, where it functions in host-cell disruption and merozoite egress [PMID:18419771, PMID:41616267]. In P. berghei, SERA3 is transcribed and its protein is processed during late liver stages, and it leaks into the hepatocyte cytoplasm during merozoite development, positioning it to contribute to host cell death [PMID:18419771]. Conditional mutagenesis established that P. berghei SERA3 is dispensable for hepatocyte invasion and late liver-stage development but is essential for hepatic merozoite egress and the transition to blood-stage infection [PMID:41616267]; it also localizes to the surface of ookinetes and sporozoites and is processed at these stages, with SUB1 (subtilisin-like protease) identified as the protease responsible for its maturation [PMID:41616267]. Consistent with a non-essential blood-stage role, SERA3 is dispensable for erythrocytic growth in P. falciparum, in contrast to the essential SERA4–6 members of the same locus [PMID:12228245], and is expressed in trophozoite and schizont stages within the coordinately regulated chromosome 2 SERA cluster [PMID:7891737, PMID:12244052]. Beyond its processing by SUB1 and its role in hepatic egress, the biochemical activity of the SERA3 papain domain and its downstream targets during host cell disruption have not been characterized in the available corpus.","teleology":[{"year":1994,"claim":"Establishing SERA3 as a discrete gene within the chromosome 2 SERA cluster addressed whether it is an independent, stage-regulated transcript rather than part of the adjacent SERA locus.","evidence":"Transcript mapping and stage-specific RT analysis in P. falciparum","pmids":["7891737"],"confidence":"Low","gaps":["Transcript mapping only, no protein-level or functional data for SERA3","Shared transcriptional control mechanism inferred but not demonstrated","No P. berghei ortholog data at this stage"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2002,"claim":"Targeted disruption resolved whether SERA3 is required for asexual blood-stage growth, distinguishing it functionally from its essential paralogs.","evidence":"Gene knockout, antibody reactivity to recombinant protein, RT-PCR/microarray in P. falciparum; indirect immunofluorescence localizing SERA3 in trophozoite/schizont-infected erythrocytes","pmids":["12228245","12244052"],"confidence":"Medium","gaps":["Dispensability shown for blood stage only, other life-cycle stages untested","Biochemical activity of the protein not addressed","Localization method single, no functional consequence linked"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2008,"claim":"Detection of processed SERA3 leaking into the hepatocyte cytoplasm during late liver stages raised the possibility that it participates in host cell disruption during merozoite development.","evidence":"RT-PCR, IFA, Western blot, and a TAP-tagged transgenic line under the endogenous promoter in P. berghei","pmids":["18419771"],"confidence":"Medium","gaps":["Contribution to host cell death is inferred from localization, not demonstrated functionally","Protease responsible for processing not identified in this study","Host targets, if any, unknown"],"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2026,"claim":"Conditional knockout defined a specific and essential role for SERA3 in hepatic merozoite egress, and identified SUB1 as its maturating protease, connecting surface presentation and stage-specific processing to function.","evidence":"Flp/FRT conditional mutagenesis, non-permeabilized surface IFA of ookinetes/sporozoites, and Western blot of proteolytic products in P. berghei","pmids":["41616267"],"confidence":"Medium","gaps":["Enzymatic activity of the SERA3 papain domain not directly demonstrated","Molecular mechanism by which SERA3 drives egress unresolved","SUB1 cleavage sites and functional consequence of processing not mapped"],"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":null,"claim":"The catalytic activity of the SERA3 papain domain, its physiological substrates during hepatic egress and host cell disruption, and the mechanistic link between its surface presentation on ookinetes/sporozoites and its liver-stage function remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No demonstrated proteolytic or other enzymatic activity for SERA3","No identified substrate or binding partner","Role at ookinete/sporozoite surface functionally uncharacterized"],"attribution":[{"species":"Plasmodium berghei","strain":""}]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":[],"partners":["SUB1 (SUBTILISIN-LIKE PROTEASE; MATURES PBANKA_0304900) [#1]"],"other_free_text":["PBANKA_0304900 (SERA3) is a papain-domain-containing serine repeat antigen and a member of the chromosome 2 SERA gene cluster [#2].","Dispensable for P. berghei blood-stage/late liver-stage development but essential for hepatic merozoite egress [#1]; dispensable for P. falciparum erythrocytic growth, unlike essential paralogs SERA4-6 [#3].","Processed into two proteolytic products in ookinete and sporozoite stages, consistent with blood-stage processing [#1].","Recognized by antibodies from malaria-immune individuals, indicating in vivo expression [#3]."]}},"prefetch_data":{},"corpus_meta":[{"pmid":"12228245","id":"PMC_12228245","title":"A subset of Plasmodium falciparum SERA genes are expressed and appear to play an important role in the erythrocytic cycle.","date":"2002","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12228245","citation_count":137,"is_preprint":false,"source_species":["Pb"],"role":"primary","match_terms":["SERA3"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"21660657","id":"PMC_21660657","title":"Falcipains and other cysteine proteases of malaria parasites.","date":"2011","source":"Advances in experimental medicine and biology","url":"https://pubmed.ncbi.nlm.nih.gov/21660657","citation_count":116,"is_preprint":false,"source_species":["Pb"],"role":"primary","match_terms":["cysteine protease"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"29459732","id":"PMC_29459732","title":"A protease cascade regulates release of the human malaria parasite Plasmodium falciparum from host red blood cells.","date":"2018","source":"Nature microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/29459732","citation_count":100,"is_preprint":false,"source_species":["Pb"],"role":"primary","match_terms":["cysteine protease"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"12244052","id":"PMC_12244052","title":"Serine repeat antigen (SERA5) is predominantly expressed among the SERA multigene family of Plasmodium falciparum, and the acquired antibody titers correlate with serum inhibition of the parasite growth.","date":"2002","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12244052","citation_count":83,"is_preprint":false,"source_species":["Pb"],"role":"primary","match_terms":["SERA3"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"29902171","id":"PMC_29902171","title":"Exposure and infection to Plasmodium knowlesi in case study communities in Northern Sabah, Malaysia and Palawan, The Philippines.","date":"2018","source":"PLoS neglected tropical diseases","url":"https://pubmed.ncbi.nlm.nih.gov/29902171","citation_count":79,"is_preprint":false,"source_species":["Pb"],"role":"primary","match_terms":["PkSERA3"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"18419771","id":"PMC_18419771","title":"Expression and processing of Plasmodium berghei SERA3 during liver stages.","date":"2008","source":"Cellular microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/18419771","citation_count":46,"is_preprint":false,"source_species":["Pb"],"role":"primary","match_terms":["SERA3","cysteine protease","PbSERA3"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"7891737","id":"PMC_7891737","title":"Analysis of stage-specific transcripts of the Plasmodium falciparum serine repeat antigen (SERA) gene and transcription from the SERA locus.","date":"1994","source":"Molecular and biochemical parasitology","url":"https://pubmed.ncbi.nlm.nih.gov/7891737","citation_count":40,"is_preprint":false,"source_species":["Pb"],"role":"primary","match_terms":["SERA3"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"42431567","id":"PMC_42431567","title":"Bioinformatic analysis of Plasmodium knowlesi Serine Repeat Antigen 3 (SERA3) sequences for antimalarial peptide development.","date":"2026","source":"Acta tropica","url":"https://pubmed.ncbi.nlm.nih.gov/42431567","citation_count":0,"is_preprint":false,"source_species":["Pb"],"role":"primary","match_terms":["SERA3","PkSERA3"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"41616267","id":"PMC_41616267","title":"Plasmodium berghei serine repeat antigen 3 (PbSERA3) is required for hepatic merozoite egress.","date":"2026","source":"mBio","url":"https://pubmed.ncbi.nlm.nih.gov/41616267","citation_count":0,"is_preprint":false,"source_species":["Pb"],"role":"primary","match_terms":["PbSERA3"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"39185645","id":"PMC_39185645","title":"Therapeutic Targeting and Role of Cysteine Proteases in the Life Cycle of Malaria Parasite.","date":"2025","source":"Current medicinal chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/39185645","citation_count":0,"is_preprint":false,"source_species":["Pb"],"role":"primary","match_terms":["SERA3"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"37595939","id":"PMC_37595939","title":"Genetic diversity and in silico analysis of Plasmodium knowlesi Serine Repeat Antigen (SERA) 3 antigen 2 in Malaysia.","date":"2023","source":"Infection, genetics and evolution : journal of molecular epidemiology and evolutionary genetics in infectious diseases","url":"https://pubmed.ncbi.nlm.nih.gov/37595939","citation_count":2,"is_preprint":false,"source_species":["Pb"],"role":"primary","match_terms":["SERA3","PkSERA3"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":8970,"output_tokens":1606,"usd":0.0255,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":6633,"output_tokens":2426,"usd":0.046907,"stage2_stop_reason":"end_turn"},"total_usd":0.072407,"stage1_batch_id":"msgbatch_01DbiymDmubkPpYvdbAu5a7V","stage2_batch_id":"msgbatch_012TbrWvMRH129T7PQ4SmvrJ","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2008,\n      \"finding\": \"PBANKA_0304900 (PbSERA3) is transcribed and its protein is processed during late liver stages in P. berghei; immunofluorescence assays using an antiserum against a non-conserved region of PbSERA3 and a transgenic P. berghei strain expressing TAP-tagged PbSERA3 showed that PbSERA3 leaks into the host cell cytoplasm during merozoite development, where it may contribute to host cell death or activate host cell proteases executing cell death. Processed PbSERA3 was detected by Western blot in cell extracts of schizont-infected cells and merozoite-infected detached hepatic cells.\",\n      \"method\": \"RT-PCR, immunofluorescence assay, Western blot, transgenic parasite expressing TAP-tagged PbSERA3 under endogenous promoter\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization by IFA and TAP-tag transgenic line, Western blot processing data, multiple orthogonal methods in single lab\",\n      \"pmids\": [\"18419771\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"PBANKA_0304900 (PbSERA3) is essential for hepatic merozoite egress in P. berghei: conditional mutants generated using a yeast-based Flp/FRT system invaded hepatocytes and developed normally in late liver stages but failed to initiate blood-stage infection, demonstrating a required role in liver-stage egress. PbSERA3 was also localized on the surface of ookinetes and sporozoites under non-permeabilized conditions, indicating an extracellular presentation at these stages. PbSERA3 is processed in ookinete and sporozoite stages, yielding two proteolytic products consistent with blood-stage processing. PbSERA3 is identified as a substrate of subtilisin-like protease SUB1, and its proteolytic maturation by SUB1 is proposed as a conserved event required for hepatic egress.\",\n      \"method\": \"Conditional mutagenesis (Flp/FRT system), surface localization by immunofluorescence under non-permeabilized conditions, Western blot of proteolytic processing products\",\n      \"journal\": \"mBio\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean conditional KO with specific phenotypic readout, surface localization and processing validated by multiple methods, single lab\",\n      \"pmids\": [\"41616267\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"SERA3 (in P. falciparum) was identified as a distinct gene located 1.8 kb upstream of SERA on chromosome 2; its direction of transcription was mapped relative to other chromosome 2 genetic markers. SERA3 mRNA is expressed in a stage-specific manner (trophozoite and schizont stages) and is coordinately regulated with neighboring SERA locus genes, implicating a shared transcriptional control mechanism.\",\n      \"method\": \"Transcript mapping, RNA sequencing, stage-specific RT analysis\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, transcript mapping only, no protein-level or functional data for SERA3 specifically\",\n      \"pmids\": [\"7891737\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"In P. falciparum, SERA3 (chromosome 2 cluster) was targeted for disruption and found to be dispensable for blood-stage erythrocytic growth, in contrast to SERA4–6 which could not be disrupted. Antibodies from malaria-immune individuals reacted with SERA3 recombinant protein, suggesting expression in at least some parasite populations.\",\n      \"method\": \"Gene disruption by targeted knockout, antibody reactivity assay with recombinant protein, RT-PCR and microarray\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct gene disruption experiment establishing dispensability, replicated across multiple SERA family members in same study as internal controls\",\n      \"pmids\": [\"12228245\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"In P. falciparum, indirect immunofluorescence microscopy using polyclonal antibodies raised against recombinant N-terminal portions of SERA3–6 detected SERA3 protein expression in trophozoite- and schizont-infected erythrocytes, with similar localization to other SERA family members.\",\n      \"method\": \"Indirect immunofluorescence microscopy with antigen-specific polyclonal antibodies\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single localization method, no functional consequence linked, single lab\",\n      \"pmids\": [\"12244052\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"current_model\": \"PBANKA_0304900 (PbSERA3), a papain-domain-containing serine repeat antigen, is expressed and processed (by subtilisin-like protease SUB1) in multiple Plasmodium life-cycle stages; in P. berghei it is dispensable for blood-stage growth but is required for hepatic merozoite egress, localizes to the surface of ookinetes and sporozoites, and leaks into the hepatocyte cytoplasm during late liver-stage schizogony where it may participate in host cell disruption.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PBANKA_0304900 (SERA3) encodes a papain-domain-containing serine repeat antigen that is expressed, presented at the parasite surface, and proteolytically processed across multiple Plasmodium life-cycle stages, where it functions in host-cell disruption and merozoite egress [#0, #1]. In P. berghei, SERA3 is transcribed and its protein is processed during late liver stages, and it leaks into the hepatocyte cytoplasm during merozoite development, positioning it to contribute to host cell death [#0]. Conditional mutagenesis established that P. berghei SERA3 is dispensable for hepatocyte invasion and late liver-stage development but is essential for hepatic merozoite egress and the transition to blood-stage infection [#1]; it also localizes to the surface of ookinetes and sporozoites and is processed at these stages, with SUB1 (subtilisin-like protease) identified as the protease responsible for its maturation [#1]. Consistent with a non-essential blood-stage role, SERA3 is dispensable for erythrocytic growth in P. falciparum, in contrast to the essential SERA4\\u20136 members of the same locus [#3], and is expressed in trophozoite and schizont stages within the coordinately regulated chromosome 2 SERA cluster [#2, #4]. Beyond its processing by SUB1 and its role in hepatic egress, the biochemical activity of the SERA3 papain domain and its downstream targets during host cell disruption have not been characterized in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Establishing SERA3 as a discrete gene within the chromosome 2 SERA cluster addressed whether it is an independent, stage-regulated transcript rather than part of the adjacent SERA locus.\",\n      \"evidence\": \"Transcript mapping and stage-specific RT analysis in P. falciparum\",\n      \"pmids\": [\"7891737\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Transcript mapping only, no protein-level or functional data for SERA3\", \"Shared transcriptional control mechanism inferred but not demonstrated\", \"No P. berghei ortholog data at this stage\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Targeted disruption resolved whether SERA3 is required for asexual blood-stage growth, distinguishing it functionally from its essential paralogs.\",\n      \"evidence\": \"Gene knockout, antibody reactivity to recombinant protein, RT-PCR/microarray in P. falciparum; indirect immunofluorescence localizing SERA3 in trophozoite/schizont-infected erythrocytes\",\n      \"pmids\": [\"12228245\", \"12244052\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Dispensability shown for blood stage only, other life-cycle stages untested\", \"Biochemical activity of the protein not addressed\", \"Localization method single, no functional consequence linked\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Detection of processed SERA3 leaking into the hepatocyte cytoplasm during late liver stages raised the possibility that it participates in host cell disruption during merozoite development.\",\n      \"evidence\": \"RT-PCR, IFA, Western blot, and a TAP-tagged transgenic line under the endogenous promoter in P. berghei\",\n      \"pmids\": [\"18419771\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Contribution to host cell death is inferred from localization, not demonstrated functionally\", \"Protease responsible for processing not identified in this study\", \"Host targets, if any, unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Conditional knockout defined a specific and essential role for SERA3 in hepatic merozoite egress, and identified SUB1 as its maturating protease, connecting surface presentation and stage-specific processing to function.\",\n      \"evidence\": \"Flp/FRT conditional mutagenesis, non-permeabilized surface IFA of ookinetes/sporozoites, and Western blot of proteolytic products in P. berghei\",\n      \"pmids\": [\"41616267\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Enzymatic activity of the SERA3 papain domain not directly demonstrated\", \"Molecular mechanism by which SERA3 drives egress unresolved\", \"SUB1 cleavage sites and functional consequence of processing not mapped\"],\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The catalytic activity of the SERA3 papain domain, its physiological substrates during hepatic egress and host cell disruption, and the mechanistic link between its surface presentation on ookinetes/sporozoites and its liver-stage function remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No demonstrated proteolytic or other enzymatic activity for SERA3\", \"No identified substrate or binding partner\", \"Role at ookinete/sporozoite surface functionally uncharacterized\"],\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [],\n    \"localization\": [\n      {\"term_id\": \"host cell cytoplasm\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"cell surface\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"infected erythrocyte (trophozoite/schizont stage)\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"merozoite egress from host cell\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"host cell disruption / death\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"SUB1 (subtilisin-like protease; matures PBANKA_0304900) [#1]\"\n    ],\n    \"other_free_text\": [\n      \"PBANKA_0304900 (SERA3) is a papain-domain-containing serine repeat antigen and a member of the chromosome 2 SERA gene cluster [#2].\",\n      \"Dispensable for P. berghei blood-stage/late liver-stage development but essential for hepatic merozoite egress [#1]; dispensable for P. falciparum erythrocytic growth, unlike essential paralogs SERA4-6 [#3].\",\n      \"Processed into two proteolytic products in ookinete and sporozoite stages, consistent with blood-stage processing [#1].\",\n      \"Recognized by antibodies from malaria-immune individuals, indicating in vivo expression [#3].\"\n    ]\n  }\n}","audit_flag":null,"strains":[{"strain":"PbANKA","gene_id":"PBANKA_0304900","name":null,"product":"serine repeat antigen 3","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_0413600","name":null,"product":"cysteine protease, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"SERA3","evaluation":null}