A Role for H2B Ubiquitylation in DNA Replication

Kelly M. Trujillo, Mary Ann Osley

Research output: Contribution to journalArticlepeer-review

94 Scopus citations


The monoubiquitylation of histone H2B plays an important role in gene expression by contributing to the regulation of transcription elongation and mRNA processing and export. We explored additional cellular functions of this histone modification by investigating its localization to intergenic regions. H2B ubiquitylation is present in chromatin around origins of DNA replication in budding yeast, and as DNA is replicated its levels are maintained on daughter strands by the Bre1 ubiquitin ligase. In the absence of H2B ubiquitylation, the prereplication complex is formed and activated, but replication fork progression is slowed down and the replisome becomes unstable in the presence of hydroxyurea. H2B ubiquitylation promotes the assembly or stability of nucleosomes on newly replicated DNA, and this function is postulated to contribute to fork progression and replisome stability.

Original languageEnglish (US)
Pages (from-to)734-746
Number of pages13
JournalMolecular Cell
Issue number5
StatePublished - Dec 14 2012
Externally publishedYes

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology


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