A Role for Gcn5 in Replication-Coupled Nucleosome Assembly

Mol Cell. 2010 Feb 26;37(4):469-80. doi: 10.1016/j.molcel.2010.01.020.

Abstract

Acetylation of lysine residues at the H3 N terminus is proposed to function in replication-coupled (RC) nucleosome assembly, a process critical for the inheritance of epigenetic information and maintenance of genome stability. However, the role of H3 N-terminal lysine acetylation and the corresponding lysine acetyltransferase (KAT) in RC nucleosome assembly are not known. Here we show that Gcn5, a KAT that functions in transcription, works in parallel with Rtt109, the H3 lysine 56 KAT, to promote RC nucleosome assembly. Cells lacking both Gcn5 and Rtt109 are highly sensitive to DNA damaging agents. Moreover, cells lacking GCN5 or those that express N-terminal H3 mutants are compromised for deposition of new H3 onto replicating DNA and also show reduced binding of H3 to CAF-1, a histone chaperone involved in RC nucleosome assembly. These results demonstrate that Gcn5 regulates RC nucleosome assembly, in part, by promoting H3 association with CAF-1 via H3 acetylation.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acetylation
  • Cell Cycle
  • DNA Damage
  • DNA Replication*
  • DNA, Fungal / genetics*
  • Genome, Fungal
  • Genomic Instability
  • Histone Acetyltransferases / genetics
  • Histone Acetyltransferases / metabolism*
  • Histones / metabolism
  • Mutation
  • Nucleosomes / metabolism*
  • Protein Binding
  • Saccharomyces cerevisiae / cytology
  • Saccharomyces cerevisiae / genetics
  • Saccharomyces cerevisiae / metabolism*
  • Saccharomyces cerevisiae Proteins / genetics
  • Saccharomyces cerevisiae Proteins / metabolism*

Substances

  • DNA, Fungal
  • Histones
  • Nucleosomes
  • Saccharomyces cerevisiae Proteins
  • GCN5 protein, S cerevisiae
  • Histone Acetyltransferases
  • Rtt109 protein, S cerevisiae