BDP5

BDP5 (PF3D7_1234100) is a bromodomain-containing protein of Plasmodium falciparum that functions as a subunit of the TAF (TBP-associated-factor) epigenetic reader complex, identified through histone peptide pull-downs and interaction proteomics of tagged proteins (PMID:31728527). Beyond its membership in this complex, BDP5's specific molecular contribution has not been dissected in the available corpus. In schizont-stage parasites BDP5 is phosphorylated at multiple residues (T2289, S2291, S2395, T2397), and these phosphosites accumulate upon knockdown of the phosphatase PfNIF4, placing BDP5 as a substrate whose phosphorylation state is regulated by PfNIF4 (PMID:35938722). Stage-specific chromatin-binding profiling is consistent with BDP5 associating with chromatin in a stage-dependent manner, though the authors note this signal could not be cleanly separated from assay background (PMID:40675147). The functional consequences of BDP5 phosphorylation and its precise role within the TAF complex remain uncharacterized in the available corpus.

1. 2019 Medium

   Establishing which epigenetic machinery BDP5 belongs to was the first step in placing this bromodomain protein in a functional context; interaction proteomics assigned it to the TAF reader complex.

   Evidence Histone peptide pull-downs, tagging and co-immunoprecipitation of tagged proteins with mass spectrometry in P. falciparum

   PMID:31728527

   Open questions at the time

   • BDP5's specific molecular contribution within the TAF complex was not dissected
   • No structural or domain-level characterization of BDP5's interactions
   • No functional knockout/knockdown phenotype for BDP5 reported
2. 2022 Low

   Whether BDP5 activity is post-translationally regulated was addressed by mapping its phosphosites and linking them to a phosphatase, establishing BDP5 as a PfNIF4-regulated substrate in schizonts.

   Evidence TurboID proximity phosphoproteomics following inducible ribozyme knockdown of PfNIF4 in P. falciparum

   PMID:35938722

   Open questions at the time

   • No direct enzymatic assay or mutagenesis of BDP5 phosphosites was performed
   • Functional consequence of BDP5 phosphorylation is unknown
   • Whether PfNIF4 acts directly on BDP5 versus indirectly is not established
3. 2025 Low

   Where BDP5 acts on the genome across the cell cycle was probed by proximity-based chromatin profiling, indicating stage-specific association with open/active chromatin regions.

   Evidence DiBioCUT&Tag on FKBP-tagged BDP5 with rapalog-inducible FRB-TurboID at trophozoite and schizont stages in P. falciparum

   PMID:40675147

   Open questions at the time

   • BDP5-specific signal was confounded by free-floating miniTurbo background, making it uninterpretable per the authors
   • No validated target genes or loci identified
   • No link between chromatin binding and transcriptional output

• The specific molecular function of BDP5 within the TAF complex, the histone marks its bromodomain reads, and the functional consequences of its PfNIF4-regulated phosphorylation remain unresolved.
• No demonstrated bromodomain ligand or histone-mark specificity for BDP5
• No loss-of-function phenotype attributing a biological role to BDP5
• No causal link between phosphorylation state and chromatin binding or complex function