c-Myb acetylation at the carboxyl-terminal conserved domain by transcriptional co-activator p300

Akihiro Tomita, Masayuki Towatari, Shinobu Tsuzuki, Fumihiko Hayakawa, Hiroshi Kosugi, Katsuyuki Tamai, Toshiaki Miyazaki, Tomohiro Kinoshita, Hidehiko Saito

Research output: Contribution to journalArticlepeer-review

110 Citations (Scopus)


Transcription factor c-Myb plays important roles in cell survival and differentiation in immature hematopoietic cells. Here we demonstrate that c-Myb is acetylated at the carboxyl-terminal conserved domain by histone acetyltransferase p300 both in vitro and in vivo. The acetylation sites in vivo have been located at the lysine residues of the conserved domain (K471, K480, K485) by the use of the mutant Myb (Myb-KAmut), in which all three lysine residues are substituted into alanine. Electrophoretic mobility shift assay reveals that Myb-KAmut shows higher DNA binding activity than wild type c-Myb and that acetylation of c-Myb in vitro by p300 causes dramatic increase in DNA binding activity. Accordingly, transactivation activity of both mim-1 and CD34 promoters by Myb-KAmut is higher than that driven by wild type c-Myb. Furthermore, the bromodomain of p300, in addition to the histone acetyltransferase (HAT) domain, is required for effective acetylation of c-Myb, and hGCN5 is revealed to be a factor acetyltransferase for c-Myb in vitro. We present a new manner of post-translational modification of the c-Myb protein and the potential significance of the acetylation in c-Myb.

Original languageEnglish
Pages (from-to)444-451
Number of pages8
Issue number3
Publication statusPublished - 20-01-2000
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Molecular Biology
  • Genetics
  • Cancer Research


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