An rtt109-independent role for vps75 in transcription-associated nucleosome dynamics

Mol Cell Biol. 2009 Aug;29(15):4220-34. doi: 10.1128/MCB.01882-08. Epub 2009 May 26.

Abstract

The histone chaperone Vps75 forms a complex with, and stimulates the activity of, the histone acetyltransferase Rtt109. However, Vps75 can also be isolated on its own and might therefore possess Rtt109-independent functions. Analysis of epistatic miniarray profiles showed that VPS75 genetically interacts with factors involved in transcription regulation whereas RTT109 clusters with genes linked to DNA replication/repair. Additional genetic and biochemical experiments revealed a close relationship between Vps75 and RNA polymerase II. Furthermore, Vps75 is recruited to activated genes in an Rtt109-independent manner, and its genome-wide association with genes correlates with transcription rate. Expression microarray analysis identified a number of genes whose normal expression depends on VPS75. Interestingly, histone H2B dynamics at some of these genes are consistent with a role for Vps75 in histone H2A/H2B eviction/deposition during transcription. Indeed, reconstitution of nucleosome disassembly using the ATP-dependent chromatin remodeler Rsc and Vps75 revealed that these proteins can cooperate to remove H2A/H2B dimers from nucleosomes. These results indicate a role for Vps75 in nucleosome dynamics during transcription, and importantly, this function appears to be largely independent of Rtt109.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acetylation
  • Binding Sites / genetics
  • Chromatin Immunoprecipitation
  • Cluster Analysis
  • Gene Expression Profiling
  • Genome, Fungal / genetics
  • Histone Acetyltransferases / genetics
  • Histone Acetyltransferases / metabolism*
  • Histones / genetics
  • Histones / metabolism
  • Lysine / genetics
  • Lysine / metabolism
  • Molecular Chaperones / genetics
  • Molecular Chaperones / metabolism*
  • Mutation
  • Nucleosomes / metabolism*
  • Oligonucleotide Array Sequence Analysis
  • Protein Binding
  • RNA Polymerase II / metabolism
  • Saccharomyces cerevisiae / genetics
  • Saccharomyces cerevisiae / metabolism
  • Saccharomyces cerevisiae Proteins / genetics
  • Saccharomyces cerevisiae Proteins / metabolism*
  • Transcription, Genetic*

Substances

  • Histones
  • Molecular Chaperones
  • Nucleosomes
  • Saccharomyces cerevisiae Proteins
  • Vps75 protein, S cerevisiae
  • Histone Acetyltransferases
  • Rtt109 protein, S cerevisiae
  • RNA Polymerase II
  • RPB1 protein, S cerevisiae
  • Lysine

Associated data

  • GEO/GSE15697