The nucleosome acidic patch plays a critical role in RNF168-dependent ubiquitination of histone H2A

Francesca Mattiroli, Michael Uckelmann, Danny D. Sahtoe, Willem J. van Dijk, Titia K. Sixma

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60 Citations (Scopus)

Abstract

During DNA damage response, the RING E3 ligase RNF168 ubiquitinates nucleosomal H2A at K13-15. Here we show that the ubiquitination reaction is regulated by its substrate. We define a region on the RING domain important for target recognition and identify the H2A/H2B dimer as the minimal substrate to confer lysine specificity to the RNF168 reaction. Importantly, we find an active role for the substrate in the reaction. H2A/H2B dimers and nucleosomes enhance the E3-mediated discharge of ubiquitin from the E2 and redirect the reaction towards the relevant target, in a process that depends on an intact acidic patch. This active contribution of a region distal from the target lysine provides regulation of the specific K13-15 ubiquitination reaction during the complex signalling process at DNA damage sites.

Original languageEnglish
Article number3291
Number of pages10
JournalNature Communications
Volume5
DOIs
Publication statusPublished - 12 Feb 2014
Externally publishedYes

Keywords

  • DNA damage and repair
  • nucleosomes
  • ubiquitylation

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