Transcriptional activation via sequential histone H2B ubiquitylation and deubiquitylation, mediated by SAGA-associated Ubp8

Karl W. Henry, Anastasia Wyce, Wan Sheng Lo, Laura J. Duggan, N. C Tolga Emre, Cheng Fu Kao, Lorraine Pillus, Ali Shilatifard, Mary Ann Osley, Shelley L. Berger*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

488 Scopus citations

Abstract

Gene activation and repression regulated by acetylation and deacetylation represent a paradigm for the function of histone modifications. We provide evidence that, in contrast, histone H2B monoubiquitylation and its deubiquitylation are both involved in gene activation. Substitution of the H2B ubiquitylation site at Lys 123 (K123) lowered transcription of certain genes regulated by the acetylation complex SAGA. Gene-associated H2B ubiquitylation was transient, increasing early during activation, and then decreasing coincident with significant RNA accumulation. We show that Ubp8, a component of the SAGA acetylation complex, is required for SAGA-mediated deubiquitylation of histone H2B in vitro. Loss of Ubp8 in vivo increased both gene-associated and overall cellular levels of ubiquitylated H2B. Deletion of Ubp8 lowered transcription of SAGA-regulated genes, and the severity of this defect was exacerbated by codeletion of the Gcn5 acetyltransferase within SAGA. In addition, disruption of either ubiquitylation or Ubp8-mediated deubiquitylation of H2B resulted in altered levels of gene-associated H3 Lys 4 methylation and Lys 36 methylation, which have both been linked to transcription. These results suggest that the histone H2B ubiquitylation state is dynamic during transcription, and that the sequence of histone modifications helps to control transcription.

Original languageEnglish (US)
Pages (from-to)2648-2663
Number of pages16
JournalGenes and Development
Volume17
Issue number21
DOIs
StatePublished - Nov 1 2003

Keywords

  • Histone
  • Methylation
  • Modifications
  • SAGA
  • Transcription
  • Ubiquitylation

ASJC Scopus subject areas

  • Genetics
  • Developmental Biology

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