{"gene":"PF3D7_1033700","run_date":"2026-09-08T12:51:28","timeline":{"discoveries":[{"year":2015,"finding":"BDP1 (PF3D7_1033700) binds to chromatin at transcriptional start sites of invasion-related genes in P. falciparum and directly controls their expression; conditional knockdown causes dramatic defects in parasite invasion and growth with transcriptional downregulation of multiple invasion-related genes, while overexpression enhances expression of the same genes.","method":"Conditional knockdown, overexpression, ChIP, transcriptional analysis","journal":"Cell host & microbe","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal gain- and loss-of-function with defined cellular phenotype, ChIP localization, replicated across multiple orthogonal methods in one study and referenced by multiple subsequent papers","pmids":["26067602"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2015,"finding":"BDP1 (PF3D7_1033700) binds to acetylated histone H3 and physically associates with a second bromodomain protein, PfBDP2, suggesting a mechanism for chromatin recognition and gene regulation.","method":"Co-immunoprecipitation / protein interaction assay","journal":"Cell host & microbe","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single Co-IP result, but reported alongside functional knockdown data in the same study and independently confirmed in later proteomics work","pmids":["26067602"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2017,"finding":"BDP1 (PF3D7_1033700) associates with the ApiAP2 transcription factor PfAP2-I as part of a chromatin-associated complex, and this complex formation is associated with transcriptional regulation of red blood cell invasion genes.","method":"Co-immunoprecipitation, ChIP-seq (genome-wide binding analysis of PfAP2-I)","journal":"Cell host & microbe","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP plus ChIP-seq showing co-occupancy, single lab, two complementary methods","pmids":["28618269"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2019,"finding":"BDP1 (PF3D7_1033700) is recruited to chromatin in an acetylation-level-dependent manner, forming the BDP1/BDP2 core complex; quantitative histone peptide pull-downs identified BDP1 as a reader preferentially recruited by histone acetylation marks.","method":"Histone peptide pull-downs, quantitative proteomics, interaction proteomics","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — quantitative proteomic pull-downs with acetylated histone peptides, single lab, multiple PTM conditions tested","pmids":["31728527"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2022,"finding":"The crystal structure of the BDP1 bromodomain (PfBDP1-BRD) reveals it contains the conserved bromodomain fold but has a unique binding mechanism distinct from human bromodomain families; NMR and ITC binding assays show it preferentially recognizes tetra-acetylated histone H4, with weaker interactions with multi-acetylated H2A.Z, in addition to previously reported acetylated histone H3.","method":"X-ray crystallography, solution NMR spectroscopy, isothermal titration calorimetry (ITC)","journal":"International journal of biological macromolecules","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus NMR plus ITC, multiple orthogonal biophysical methods in a single study establishing binding specificity and structural mechanism","pmids":["36328269"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2022,"finding":"BDP1 (PF3D7_1033700) forms a constitutive complex with PfBDP7 in addition to PfBDP2; BDP1 and PfBDP7 co-localize at invasion gene promoters in mature schizonts and are co-enriched across heterochromatic gene bodies of all variant surface antigen (VSA) families including PfEMP1, RIFIN, STEVOR, and PfMC-2TM. Conditional knockdown of BDP1 results in de-repression of VSA expression at both mRNA and protein levels, establishing a role in heterochromatic silencing of virulence genes.","method":"Co-immunoprecipitation, ChIP-seq, conditional knockdown, mRNA and protein expression analysis","journal":"Frontiers in cell and developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, genome-wide ChIP-seq, conditional knockdown with mRNA and protein readouts, multiple orthogonal methods","pmids":["35493110"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2012,"finding":"BDP1 (PF3D7_1033700) is localized to the nucleus of P. falciparum, as confirmed by experimental validation using transgenic cell lines as part of the nuclear proteome characterization.","method":"Mass spectrometry-based nuclear proteomics, experimental validation with transgenic cell lines","journal":"Genome biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct nuclear fractionation combined with transgenic localization validation, single study","pmids":["23181666"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2021,"finding":"BDP1 (PF3D7_1033700) co-regulates invasion genes in conjunction with PfAP2-I and the PfGCN5 complex; genes downregulated by GCN5 bromodomain or PfPHD1 domain deletion overlap substantially with genes regulated by AP2-I and BDP1, suggesting that BDP1 participates in targeted recruitment of the PfGCN5 complex to invasion gene promoters.","method":"Genetic domain deletion, transcriptomics, ChIP, epistasis analysis","journal":"PLoS pathogens","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis via domain deletions and transcriptomics in single lab; BDP1-specific findings are inferred from overlap analysis rather than direct manipulation of BDP1","pmids":["34403450"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2023,"finding":"BDP1 (PF3D7_1033700) associates with PfPRMT5, an arginine methyltransferase that regulates invasion; this interaction places BDP1 within a network of invasion-related transcriptional regulators including AP2-I and GCN5.","method":"Interactome/co-immunoprecipitation proteomics","journal":"Communications biology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP interactome study; BDP1 is identified as an interactor of PfPRMT5 but not directly manipulated","pmids":["37349497"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2025,"finding":"Small-molecule inhibitors developed against the BDP1 bromodomain (PfBDP1-BRD) were co-crystallized with the protein, providing first co-crystal structures of inhibitor-bound PfBDP1-BRD; conditional knockdown of BDP1 demonstrates parasite sensitivity to these inhibitors, confirming on-target activity. The bromodomain of the P. vivax ortholog (PvBDP1-BRD) was also structurally characterized.","method":"X-ray crystallography (co-crystal structures), isothermal titration calorimetry (ITC), virtual docking, conditional knockdown","journal":"ChemMedChem","confidence":"High","confidence_rationale":"Tier 1 / Moderate — co-crystal structures plus ITC plus in-parasite conditional knockdown validating on-target activity, single lab with multiple orthogonal methods","pmids":["40099623"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium vivax","strain":""}]},{"year":2020,"finding":"BDP1 (PF3D7_1033700) co-localizes with PfAP2-I and histone acetylation marks H3K18ac and H3K27ac at stably positioned nucleosomes within open chromatin regions at active transcriptional start sites in schizont stages, supporting its role in marking active regulatory sequences.","method":"ChIP-seq (integration of BDP1, PfAP2-I, and histone mark datasets), transfection-based promoter assays","journal":"Epigenetics & chromatin","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq co-localization with functional promoter validation, but BDP1 data is from prior published datasets re-integrated in this study","pmids":["33225957"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"current_model":"BDP1 (PF3D7_1033700) is a nuclear bromodomain protein in P. falciparum whose bromodomain adopts the conserved bromodomain fold with a unique binding pocket that preferentially recognizes tetra-acetylated histone H4 and multi-acetylated H3 and H2A.Z; it localizes to transcriptional start sites of invasion-related genes and heterochromatic VSA gene bodies as part of a BDP1/BDP2/BDP7 core complex, where it acts as a transcriptional activator of invasion genes (in cooperation with PfAP2-I, PfPRMT5, and the PfGCN5 complex) and as a repressor of variant surface antigen families, with conditional knockdown causing invasion defects and de-repression of VSA virulence genes."},"narrative":{"mechanistic_narrative":"BDP1 (PF3D7_1033700) is a nuclear bromodomain protein of Plasmodium falciparum that functions as an acetylation-reading chromatin regulator governing both activation of red blood cell invasion genes and silencing of variant surface antigen (VSA) virulence genes [PMID:26067602, PMID:35493110, PMID:23181666]. Its bromodomain adopts the conserved bromodomain fold but employs a binding mechanism distinct from human bromodomain families, preferentially recognizing tetra-acetylated histone H4 with weaker binding to multi-acetylated H2A.Z and to acetylated histone H3 [PMID:36328269, PMID:26067602]. Through this reader activity BDP1 is recruited to chromatin in an acetylation-dependent manner and occupies transcriptional start sites of invasion genes, where its conditional knockdown downregulates invasion gene expression and blocks parasite invasion while overexpression enhances the same genes [PMID:26067602, PMID:31728527]. At these active regulatory sites BDP1 co-localizes with the ApiAP2 transcription factor PfAP2-I and with H3K18ac/H3K27ac marks in open chromatin, and it cooperates with PfAP2-I, the PfGCN5 acetyltransferase complex, and PfPRMT5 to activate invasion gene transcription [PMID:28618269, PMID:33225957, PMID:34403450, PMID:37349497]. BDP1 assembles into a constitutive bromodomain-protein complex with PfBDP2 and PfBDP7; the BDP1/BDP7 module is co-enriched across the heterochromatic gene bodies of PfEMP1, RIFIN, STEVOR, and PfMC-2TM, and BDP1 knockdown de-represses these VSA families at mRNA and protein levels, establishing an additional role in heterochromatic silencing of virulence genes [PMID:26067602, PMID:35493110]. The bromodomain is a validated small-molecule target, with inhibitor-bound co-crystal structures and knockdown-confirmed on-target activity in parasites [PMID:40099623].","teleology":[{"year":2012,"claim":"Before functional study, establishing where BDP1 resides was needed to constrain its possible roles; nuclear proteomics placed it in the nucleus, consistent with a chromatin-associated function.","evidence":"Mass spectrometry nuclear proteomics with transgenic localization validation","pmids":["23181666"],"confidence":"Medium","gaps":["Does not address chromatin binding specificity or target genes","No functional readout"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2015,"claim":"The central question of what BDP1 does was answered by showing it binds chromatin at invasion-gene start sites and directly controls their expression, defining it as a regulator of red blood cell invasion.","evidence":"Conditional knockdown, overexpression, ChIP and transcriptional analysis in P. falciparum; Co-IP linking BDP1 to acetylated H3 and to PfBDP2","pmids":["26067602"],"confidence":"High","gaps":["Precise acetyl-mark specificity not resolved biophysically","Mechanism of PfBDP2 partnership from a single Co-IP"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2017,"claim":"To connect BDP1 to sequence-specific targeting, it was shown to associate with the ApiAP2 factor PfAP2-I in a chromatin complex co-regulating invasion genes, explaining how a generic acetyl-reader reaches specific promoters.","evidence":"Co-immunoprecipitation and genome-wide ChIP-seq co-occupancy","pmids":["28618269"],"confidence":"Medium","gaps":["Direct vs indirect nature of the interaction unresolved","Single-lab data"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2019,"claim":"Whether BDP1 recruitment is acetylation-driven was tested quantitatively, showing it is a reader preferentially pulled down by acetylated histone peptides and forming a BDP1/BDP2 core complex.","evidence":"Quantitative histone peptide pull-downs and interaction proteomics","pmids":["31728527"],"confidence":"Medium","gaps":["Which specific acetyl marks dominate recruitment not fully defined","Single lab"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2020,"claim":"Refining the activation model, BDP1 was shown to co-localize with PfAP2-I and active marks H3K18ac/H3K27ac at positioned nucleosomes in open chromatin, marking active regulatory sequences.","evidence":"Integrated ChIP-seq of BDP1, PfAP2-I and histone marks plus promoter assays","pmids":["33225957"],"confidence":"Medium","gaps":["BDP1 tracks were re-analyzed prior datasets, not newly generated","Causality of mark vs binding not established"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2021,"claim":"The pathway logic of activation was extended by epistasis showing BDP1-regulated genes overlap with PfGCN5-complex and PfAP2-I targets, implicating BDP1 in recruiting the GCN5 acetyltransferase complex to invasion promoters.","evidence":"Genetic domain deletions, transcriptomics and overlap/epistasis analysis","pmids":["34403450"],"confidence":"Medium","gaps":["BDP1's role inferred from overlap, not direct BDP1 manipulation in this study","Recruitment mechanism not shown directly"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2022,"claim":"Two advances refined the mechanism: the bromodomain crystal structure defined its unique acetyl-lysine binding specificity, and Co-IP/ChIP-seq revealed a BDP1/BDP7 complex controlling heterochromatic VSA silencing, uncovering a repressive role in addition to activation.","evidence":"X-ray crystallography, NMR and ITC for binding specificity; Co-IP, ChIP-seq and conditional knockdown with mRNA/protein readouts for VSA de-repression","pmids":["36328269","35493110"],"confidence":"High","gaps":["How one reader partitions between activating and repressive contexts unresolved","Structural basis for VSA gene-body enrichment unknown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2023,"claim":"To further map its regulatory network, BDP1 was found in the interactome of the arginine methyltransferase PfPRMT5, placing it among invasion-related regulators alongside AP2-I and GCN5.","evidence":"Co-immunoprecipitation interactome proteomics","pmids":["37349497"],"confidence":"Low","gaps":["Single Co-IP interactome; BDP1 not directly manipulated","Functional consequence of the PRMT5 association untested"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2025,"claim":"Establishing BDP1 as a druggable target, inhibitor-bound co-crystal structures were solved and knockdown-verified on-target parasite sensitivity, with the P. vivax ortholog bromodomain also structurally characterized.","evidence":"Co-crystal X-ray structures, ITC, docking and conditional knockdown in P. falciparum; structural characterization of PvBDP1-BRD","pmids":["40099623"],"confidence":"High","gaps":["In vivo antimalarial efficacy not addressed","Selectivity over other parasite bromodomains not fully defined"],"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium vivax","strain":""}]},{"year":null,"claim":"How BDP1 mechanistically switches between activating invasion genes and repressing heterochromatic VSA families through the same acetyl-reading domain remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No mechanism explaining dual activator/repressor behavior","Contribution of BDP2 vs BDP7 partners to context choice unknown","Whether distinct acetyl marks dictate each mode untested"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":["BDP1/BDP2 core complex","BDP1/BDP2/BDP7 bromodomain protein complex","PfAP2-I chromatin-associated complex","PfGCN5 complex (functional co-regulation)"],"partners":["PFBDP2","PFBDP7","PFAP2-I","PFGCN5 COMPLEX","PFPRMT5","ACETYLATED HISTONE H4 (TETRA-ACETYLATED)","ACETYLATED HISTONE H3","MULTI-ACETYLATED H2A.Z","H3K18AC / H3K27AC MARKS"],"other_free_text":["Bromodomain (PfBDP1-BRD) has the conserved bromodomain fold but a unique acetyl-lysine binding mechanism distinct from human bromodomain families [#4].","Conditional knockdown causes invasion/growth defects with downregulation of invasion genes and de-repression of VSA families (PfEMP1, RIFIN, STEVOR, PfMC-2TM) [#0, #5].","Validated small-molecule drug target with inhibitor-bound co-crystal structures and knockdown-confirmed on-target activity; P. vivax ortholog bromodomain also structurally characterized [#9]."]}},"prefetch_data":{},"corpus_meta":[{"pmid":"23181666","id":"PMC_23181666","title":"Organellar proteomics reveals hundreds of novel nuclear proteins in the malaria parasite Plasmodium 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pathogens","url":"https://pubmed.ncbi.nlm.nih.gov/34403450","citation_count":44,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["BDP1"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"33225957","id":"PMC_33225957","title":"Histone modifications associated with gene expression and genome accessibility are dynamically enriched at Plasmodium falciparum regulatory sequences.","date":"2020","source":"Epigenetics & chromatin","url":"https://pubmed.ncbi.nlm.nih.gov/33225957","citation_count":34,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["PfBDP1"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"32272012","id":"PMC_32272012","title":"Disruption of the Plasmodium falciparum Life Cycle through Transcriptional Reprogramming by Inhibitors of Jumonji Demethylases.","date":"2020","source":"ACS infectious 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invasion and growth with transcriptional downregulation of multiple invasion-related genes, while overexpression enhances expression of the same genes.\",\n      \"method\": \"Conditional knockdown, overexpression, ChIP, transcriptional analysis\",\n      \"journal\": \"Cell host & microbe\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal gain- and loss-of-function with defined cellular phenotype, ChIP localization, replicated across multiple orthogonal methods in one study and referenced by multiple subsequent papers\",\n      \"pmids\": [\"26067602\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"BDP1 (PF3D7_1033700) binds to acetylated histone H3 and physically associates with a second bromodomain protein, PfBDP2, suggesting a mechanism for chromatin recognition and gene regulation.\",\n      \"method\": \"Co-immunoprecipitation / protein interaction assay\",\n      \"journal\": \"Cell host & microbe\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single Co-IP result, but reported alongside functional knockdown data in the same study and independently confirmed in later proteomics work\",\n      \"pmids\": [\"26067602\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"BDP1 (PF3D7_1033700) associates with the ApiAP2 transcription factor PfAP2-I as part of a chromatin-associated complex, and this complex formation is associated with transcriptional regulation of red blood cell invasion genes.\",\n      \"method\": \"Co-immunoprecipitation, ChIP-seq (genome-wide binding analysis of PfAP2-I)\",\n      \"journal\": \"Cell host & microbe\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP plus ChIP-seq showing co-occupancy, single lab, two complementary methods\",\n      \"pmids\": [\"28618269\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"BDP1 (PF3D7_1033700) is recruited to chromatin in an acetylation-level-dependent manner, forming the BDP1/BDP2 core complex; quantitative histone peptide pull-downs identified BDP1 as a reader preferentially recruited by histone acetylation marks.\",\n      \"method\": \"Histone peptide pull-downs, quantitative proteomics, interaction proteomics\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — quantitative proteomic pull-downs with acetylated histone peptides, single lab, multiple PTM conditions tested\",\n      \"pmids\": [\"31728527\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The crystal structure of the BDP1 bromodomain (PfBDP1-BRD) reveals it contains the conserved bromodomain fold but has a unique binding mechanism distinct from human bromodomain families; NMR and ITC binding assays show it preferentially recognizes tetra-acetylated histone H4, with weaker interactions with multi-acetylated H2A.Z, in addition to previously reported acetylated histone H3.\",\n      \"method\": \"X-ray crystallography, solution NMR spectroscopy, isothermal titration calorimetry (ITC)\",\n      \"journal\": \"International journal of biological macromolecules\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus NMR plus ITC, multiple orthogonal biophysical methods in a single study establishing binding specificity and structural mechanism\",\n      \"pmids\": [\"36328269\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"BDP1 (PF3D7_1033700) forms a constitutive complex with PfBDP7 in addition to PfBDP2; BDP1 and PfBDP7 co-localize at invasion gene promoters in mature schizonts and are co-enriched across heterochromatic gene bodies of all variant surface antigen (VSA) families including PfEMP1, RIFIN, STEVOR, and PfMC-2TM. Conditional knockdown of BDP1 results in de-repression of VSA expression at both mRNA and protein levels, establishing a role in heterochromatic silencing of virulence genes.\",\n      \"method\": \"Co-immunoprecipitation, ChIP-seq, conditional knockdown, mRNA and protein expression analysis\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, genome-wide ChIP-seq, conditional knockdown with mRNA and protein readouts, multiple orthogonal methods\",\n      \"pmids\": [\"35493110\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"BDP1 (PF3D7_1033700) is localized to the nucleus of P. falciparum, as confirmed by experimental validation using transgenic cell lines as part of the nuclear proteome characterization.\",\n      \"method\": \"Mass spectrometry-based nuclear proteomics, experimental validation with transgenic cell lines\",\n      \"journal\": \"Genome biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct nuclear fractionation combined with transgenic localization validation, single study\",\n      \"pmids\": [\"23181666\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"BDP1 (PF3D7_1033700) co-regulates invasion genes in conjunction with PfAP2-I and the PfGCN5 complex; genes downregulated by GCN5 bromodomain or PfPHD1 domain deletion overlap substantially with genes regulated by AP2-I and BDP1, suggesting that BDP1 participates in targeted recruitment of the PfGCN5 complex to invasion gene promoters.\",\n      \"method\": \"Genetic domain deletion, transcriptomics, ChIP, epistasis analysis\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis via domain deletions and transcriptomics in single lab; BDP1-specific findings are inferred from overlap analysis rather than direct manipulation of BDP1\",\n      \"pmids\": [\"34403450\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"BDP1 (PF3D7_1033700) associates with PfPRMT5, an arginine methyltransferase that regulates invasion; this interaction places BDP1 within a network of invasion-related transcriptional regulators including AP2-I and GCN5.\",\n      \"method\": \"Interactome/co-immunoprecipitation proteomics\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP interactome study; BDP1 is identified as an interactor of PfPRMT5 but not directly manipulated\",\n      \"pmids\": [\"37349497\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Small-molecule inhibitors developed against the BDP1 bromodomain (PfBDP1-BRD) were co-crystallized with the protein, providing first co-crystal structures of inhibitor-bound PfBDP1-BRD; conditional knockdown of BDP1 demonstrates parasite sensitivity to these inhibitors, confirming on-target activity. The bromodomain of the P. vivax ortholog (PvBDP1-BRD) was also structurally characterized.\",\n      \"method\": \"X-ray crystallography (co-crystal structures), isothermal titration calorimetry (ITC), virtual docking, conditional knockdown\",\n      \"journal\": \"ChemMedChem\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — co-crystal structures plus ITC plus in-parasite conditional knockdown validating on-target activity, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"40099623\"],\n      \"is_preprint\": false,\n      \"attribution\": [\n        {\"species\": \"Plasmodium falciparum\", \"strain\": \"\"},\n        {\"species\": \"Plasmodium vivax\", \"strain\": \"\"}\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"BDP1 (PF3D7_1033700) co-localizes with PfAP2-I and histone acetylation marks H3K18ac and H3K27ac at stably positioned nucleosomes within open chromatin regions at active transcriptional start sites in schizont stages, supporting its role in marking active regulatory sequences.\",\n      \"method\": \"ChIP-seq (integration of BDP1, PfAP2-I, and histone mark datasets), transfection-based promoter assays\",\n      \"journal\": \"Epigenetics & chromatin\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq co-localization with functional promoter validation, but BDP1 data is from prior published datasets re-integrated in this study\",\n      \"pmids\": [\"33225957\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"current_model\": \"BDP1 (PF3D7_1033700) is a nuclear bromodomain protein in P. falciparum whose bromodomain adopts the conserved bromodomain fold with a unique binding pocket that preferentially recognizes tetra-acetylated histone H4 and multi-acetylated H3 and H2A.Z; it localizes to transcriptional start sites of invasion-related genes and heterochromatic VSA gene bodies as part of a BDP1/BDP2/BDP7 core complex, where it acts as a transcriptional activator of invasion genes (in cooperation with PfAP2-I, PfPRMT5, and the PfGCN5 complex) and as a repressor of variant surface antigen families, with conditional knockdown causing invasion defects and de-repression of VSA virulence genes.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"BDP1 (PF3D7_1033700) is a nuclear bromodomain protein of Plasmodium falciparum that functions as an acetylation-reading chromatin regulator governing both activation of red blood cell invasion genes and silencing of variant surface antigen (VSA) virulence genes [#0, #5, #6]. Its bromodomain adopts the conserved bromodomain fold but employs a binding mechanism distinct from human bromodomain families, preferentially recognizing tetra-acetylated histone H4 with weaker binding to multi-acetylated H2A.Z and to acetylated histone H3 [#4, #1]. Through this reader activity BDP1 is recruited to chromatin in an acetylation-dependent manner and occupies transcriptional start sites of invasion genes, where its conditional knockdown downregulates invasion gene expression and blocks parasite invasion while overexpression enhances the same genes [#0, #3]. At these active regulatory sites BDP1 co-localizes with the ApiAP2 transcription factor PfAP2-I and with H3K18ac/H3K27ac marks in open chromatin, and it cooperates with PfAP2-I, the PfGCN5 acetyltransferase complex, and PfPRMT5 to activate invasion gene transcription [#2, #10, #7, #8]. BDP1 assembles into a constitutive bromodomain-protein complex with PfBDP2 and PfBDP7; the BDP1/BDP7 module is co-enriched across the heterochromatic gene bodies of PfEMP1, RIFIN, STEVOR, and PfMC-2TM, and BDP1 knockdown de-represses these VSA families at mRNA and protein levels, establishing an additional role in heterochromatic silencing of virulence genes [#1, #5]. The bromodomain is a validated small-molecule target, with inhibitor-bound co-crystal structures and knockdown-confirmed on-target activity in parasites [#9].\",\n  \"teleology\": [\n    {\n      \"year\": 2012,\n      \"claim\": \"Before functional study, establishing where BDP1 resides was needed to constrain its possible roles; nuclear proteomics placed it in the nucleus, consistent with a chromatin-associated function.\",\n      \"evidence\": \"Mass spectrometry nuclear proteomics with transgenic localization validation\",\n      \"pmids\": [\"23181666\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not address chromatin binding specificity or target genes\", \"No functional readout\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"The central question of what BDP1 does was answered by showing it binds chromatin at invasion-gene start sites and directly controls their expression, defining it as a regulator of red blood cell invasion.\",\n      \"evidence\": \"Conditional knockdown, overexpression, ChIP and transcriptional analysis in P. falciparum; Co-IP linking BDP1 to acetylated H3 and to PfBDP2\",\n      \"pmids\": [\"26067602\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise acetyl-mark specificity not resolved biophysically\", \"Mechanism of PfBDP2 partnership from a single Co-IP\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"To connect BDP1 to sequence-specific targeting, it was shown to associate with the ApiAP2 factor PfAP2-I in a chromatin complex co-regulating invasion genes, explaining how a generic acetyl-reader reaches specific promoters.\",\n      \"evidence\": \"Co-immunoprecipitation and genome-wide ChIP-seq co-occupancy\",\n      \"pmids\": [\"28618269\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect nature of the interaction unresolved\", \"Single-lab data\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Whether BDP1 recruitment is acetylation-driven was tested quantitatively, showing it is a reader preferentially pulled down by acetylated histone peptides and forming a BDP1/BDP2 core complex.\",\n      \"evidence\": \"Quantitative histone peptide pull-downs and interaction proteomics\",\n      \"pmids\": [\"31728527\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Which specific acetyl marks dominate recruitment not fully defined\", \"Single lab\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Refining the activation model, BDP1 was shown to co-localize with PfAP2-I and active marks H3K18ac/H3K27ac at positioned nucleosomes in open chromatin, marking active regulatory sequences.\",\n      \"evidence\": \"Integrated ChIP-seq of BDP1, PfAP2-I and histone marks plus promoter assays\",\n      \"pmids\": [\"33225957\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"BDP1 tracks were re-analyzed prior datasets, not newly generated\", \"Causality of mark vs binding not established\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"The pathway logic of activation was extended by epistasis showing BDP1-regulated genes overlap with PfGCN5-complex and PfAP2-I targets, implicating BDP1 in recruiting the GCN5 acetyltransferase complex to invasion promoters.\",\n      \"evidence\": \"Genetic domain deletions, transcriptomics and overlap/epistasis analysis\",\n      \"pmids\": [\"34403450\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"BDP1's role inferred from overlap, not direct BDP1 manipulation in this study\", \"Recruitment mechanism not shown directly\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Two advances refined the mechanism: the bromodomain crystal structure defined its unique acetyl-lysine binding specificity, and Co-IP/ChIP-seq revealed a BDP1/BDP7 complex controlling heterochromatic VSA silencing, uncovering a repressive role in addition to activation.\",\n      \"evidence\": \"X-ray crystallography, NMR and ITC for binding specificity; Co-IP, ChIP-seq and conditional knockdown with mRNA/protein readouts for VSA de-repression\",\n      \"pmids\": [\"36328269\", \"35493110\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How one reader partitions between activating and repressive contexts unresolved\", \"Structural basis for VSA gene-body enrichment unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"To further map its regulatory network, BDP1 was found in the interactome of the arginine methyltransferase PfPRMT5, placing it among invasion-related regulators alongside AP2-I and GCN5.\",\n      \"evidence\": \"Co-immunoprecipitation interactome proteomics\",\n      \"pmids\": [\"37349497\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single Co-IP interactome; BDP1 not directly manipulated\", \"Functional consequence of the PRMT5 association untested\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Establishing BDP1 as a druggable target, inhibitor-bound co-crystal structures were solved and knockdown-verified on-target parasite sensitivity, with the P. vivax ortholog bromodomain also structurally characterized.\",\n      \"evidence\": \"Co-crystal X-ray structures, ITC, docking and conditional knockdown in P. falciparum; structural characterization of PvBDP1-BRD\",\n      \"pmids\": [\"40099623\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo antimalarial efficacy not addressed\", \"Selectivity over other parasite bromodomains not fully defined\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}, {\"species\": \"Plasmodium vivax\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How BDP1 mechanistically switches between activating invasion genes and repressing heterochromatic VSA families through the same acetyl-reading domain remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No mechanism explaining dual activator/repressor behavior\", \"Contribution of BDP2 vs BDP7 partners to context choice unknown\", \"Whether distinct acetyl marks dictate each mode untested\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0070577\", \"supporting_discovery_ids\": [1, 3, 4]},\n      {\"term_id\": \"GO:0003682\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"GO:0003700\", \"supporting_discovery_ids\": [0, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"GO:0000785\", \"supporting_discovery_ids\": [0, 10]},\n      {\"term_id\": \"GO:0000792\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0045944\", \"supporting_discovery_ids\": [0, 2, 7, 10]},\n      {\"term_id\": \"GO:0006342\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"GO:0006355\", \"supporting_discovery_ids\": [0, 5]}\n    ],\n    \"complexes\": [\n      \"BDP1/BDP2 core complex\",\n      \"BDP1/BDP2/BDP7 bromodomain protein complex\",\n      \"PfAP2-I chromatin-associated complex\",\n      \"PfGCN5 complex (functional co-regulation)\"\n    ],\n    \"partners\": [\n      \"PfBDP2\",\n      \"PfBDP7\",\n      \"PfAP2-I\",\n      \"PfGCN5 complex\",\n      \"PfPRMT5\",\n      \"acetylated histone H4 (tetra-acetylated)\",\n      \"acetylated histone H3\",\n      \"multi-acetylated H2A.Z\",\n      \"H3K18ac / H3K27ac marks\"\n    ],\n    \"other_free_text\": [\n      \"Bromodomain (PfBDP1-BRD) has the conserved bromodomain fold but a unique acetyl-lysine binding mechanism distinct from human bromodomain families [#4].\",\n      \"Conditional knockdown causes invasion/growth defects with downregulation of invasion genes and de-repression of VSA families (PfEMP1, RIFIN, STEVOR, PfMC-2TM) [#0, #5].\",\n      \"Validated small-molecule drug target with inhibitor-bound co-crystal structures and knockdown-confirmed on-target activity; P. vivax ortholog bromodomain also structurally characterized [#9].\"\n    ]\n  }\n}","audit_flag":null,"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_1033700","name":null,"product":"bromodomain protein 1","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PbANKA","gene_id":"PBANKA_0517500","name":null,"product":"bromodomain protein 1, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_0618500","name":null,"product":"bromodomain protein 1, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"BDP1","evaluation":null}