An Rtt109-independent role for Vps75 in transcription-associated nucleosome dynamics

Research output: Contribution to journalJournal articleResearchpeer-review

  • Luke A. Selth
  • Yahli Lorch
  • Maria T. Ocampo-Hafalla
  • Richard Mitter
  • Michael Shales
  • Nevan J. Krogan
  • Roger D. Kornberg
  • Svejstrup, Jesper Qualmann

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.

Original languageEnglish
JournalMolecular and Cellular Biology
Volume29
Issue number15
Pages (from-to)4220-4234
Number of pages15
ISSN0270-7306
DOIs
Publication statusPublished - Aug 2009
Externally publishedYes

ID: 331003804