Characterization of a phosphatase 2C protein as an interacting partner of the histone acetyltransferase GCN5 in Arabidopsis

Caroline Servet, Moussa Benhamed, David Latrasse, Wanhui Kim, Marianne Delarue, Dao Xiu Zhou*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

41 Scopus citations


Arabidopsis GCN5 is a major histone acetyltransferase. The mutation of the gene induces pleiotropic effects on plant development, and affects the expression of a large number of genes. The mechanism of action of this protein in controlling plant chromatin structure and genome expression is not understood. In this work, we report the identification of a number of potential protein interacting partners of GCN5 in Arabidopsis. In particular, GCN5 was shown to interact specifically with a phosphatase 2C protein (AtPP2C-6-6). GCN5 phosphorylated by activities in cellular extracts could be dephosphorylated by AtPP2C-6-6 in vitro. Analysis of T-DNA insertion mutants revealed a positive role of AtPP2C-6-6 in salt induction of stress-inducible genes, while the gcn5 mutation seemed to have no effect on the induction but showed up-regulation of a subset of the stress-inducible genes under non-induced conditions. In addition, the gcn5 mutation seriously reduced acetylation of histone H3K14 and H3K27, whereas the T-DNA insertions of the AtPP2C6-6 gene enhanced the acetylation of these lysine residues. Taken together, the present data suggest that AtPP2C-6-6 may function as a negative regulator of GCN5 activity in Arabidopsis.

Original languageEnglish (US)
Pages (from-to)376-382
Number of pages7
JournalBiochimica et Biophysica Acta - Gene Regulatory Mechanisms
Issue number6-7
StatePublished - Jun 2008
Externally publishedYes


  • GCN5
  • HAT
  • Histone acetylation
  • PP2C
  • Plant chromatin modification

ASJC Scopus subject areas

  • Genetics
  • Molecular Biology
  • Biophysics
  • Structural Biology
  • Biochemistry


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