title: Characterization of a phosphatase 2C protein as an interacting partner of the histone acetyltransferase GCN5 in Arabidopsis.
abstract: 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.
authors.affiliation: Institut de Biotechnologie des Plantes, CNRS UMR8618, Université Paris sud 11, 91405 Orsay, France.
authors.forename: Caroline
authors.initials: C
authors.lastname: Servet
authors.forename: Moussa
authors.initials: M
authors.lastname: Benhamed
authors.forename: David
authors.initials: D
authors.lastname: Latrasse
authors.forename: Wanhui
authors.initials: W
authors.lastname: Kim
authors.forename: Marianne
authors.initials: M
authors.lastname: Delarue
authors.forename: Dao-Xiu
authors.initials: DX
authors.lastname: Zhou
mesh_terms: D000107:Acetylation; D017360:Arabidopsis / Q000201:enzymology* / Q000235:genetics; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant; D051548:Histone Acetyltransferases / Q000235:genetics / Q000378:metabolism*; D006657:Histones / Q000378:metabolism; D016254:Mutagenesis, Insertional; D010749:Phosphoprotein Phosphatases / Q000235:genetics / Q000378:metabolism*; D010766:Phosphorylation; D010802:Phylogeny; D025941:Protein Interaction Mapping; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D020798:Two-Hybrid System Techniques; D000099224:p300-CBP-Associated Factor
chemical_list: D029681:Arabidopsis Proteins; D051548:Histone Acetyltransferases; D006657:Histones; D010749:Phosphoprotein Phosphatases; D011994:Recombinant Proteins; C501179:KAT2A protein, human; D000099224:p300-CBP-Associated Factor