BRCA1 is a histone-H2A-specific ubiquitin ligase

Reinhard Kalb, Donna L. Mallery, Conor Larkin, Jeffrey T. J. Huang, Kevin Hiom (Lead / Corresponding author)

Research output: Contribution to journalArticle

62 Citations (Scopus)
226 Downloads (Pure)

Abstract

The RING domain proteins BRCA1 and BARD1 comprise a heterodimeric ubiquitin (E3) ligase that is required for the accumulation of ubiquitin conjugates at sites of DNA damage and for silencing at DNA satellite repeat regions. Despite its links to chromatin, the substrate and underlying function of the BRCA1/BARD1 ubiquitin ligase remain unclear. Here, we show that BRCA1/BARD1 specifically ubiquitylates histone H2A in its C-terminal tail on lysines 127 and 129 in vitro and in vivo. The specificity for K127-129 is acquired only when H2A is within a nucleosomal context. Moreover, site-specific targeting of the BRCA1/BARD1 RING domains to chromatin is sufficient for H2Aub foci formation in vivo. Our data establish BRCA1/BARD1 as a histone-H2A-specific E3 ligase, helping to explain its localization and activities on chromatin in cells.
Original languageEnglish
Pages (from-to)999-1005
Number of pages7
JournalCell Reports
Volume8
Issue number4
DOIs
Publication statusPublished - 21 Aug 2014

Fingerprint Dive into the research topics of 'BRCA1 is a histone-H2A-specific ubiquitin ligase'. Together they form a unique fingerprint.

  • Profiles

    No photo of Kevin Hiom

    Hiom, Kevin

    Person: Academic

    Cite this