Bromodomain factor 1 (Bdf1) is phosphorylated by protein kinase CK2

Mol Cell Biol. 2004 Jun;24(11):4734-42. doi: 10.1128/MCB.24.11.4734-4742.2004.


Bromodomain factor 1 (Bdf1) associates with Saccharomyces cerevisiae TFIID and corresponds to the C-terminal half of higher eukaryotic TAF1. It also associates with the SWR-C complex, which is important for Htz1 deposition. Bdf1 binds preferentially to acetylated histone H4. Bdf1 is phosphorylated, but the mechanism and significance of this modification have been unclear. Two distinct regions within Bdf1 are phosphorylated; one is just C terminal to the bromodomains and the other is near the C terminus. Mutational analysis shows that phosphorylation is necessary for Bdf1 function in vivo. Endogenous protein kinase CK2 purifies with Bdf1 and phosphorylates both domains. A similar mechanism may be responsible for phosphorylation of the C-terminal region of mammalian TAF1. These findings suggest that CK2 phosphorylation of Bdf1 may regulate RNA polymerase II transcription and/or chromatin structure.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Casein Kinase II
  • Phosphorylation
  • Protein Serine-Threonine Kinases / metabolism*
  • Saccharomyces cerevisiae / metabolism
  • Saccharomyces cerevisiae Proteins / metabolism*
  • Transcription Factor TFIID / metabolism
  • Transcription Factors / metabolism*


  • BDF1 protein, S cerevisiae
  • Saccharomyces cerevisiae Proteins
  • Transcription Factor TFIID
  • Transcription Factors
  • Casein Kinase II
  • Protein Serine-Threonine Kinases