The direct interaction between 53BP1 and MDC1 Is required for the recruitment of 53BP1 to sites of damage

Yifat Eliezer, Liron Argaman, Alexandre Rhie, Aidan J. Doherty, Michal Goldberg*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

54 Scopus citations

Abstract

The DNA damage response mediators, 53BP1 and MDC1, play a central role in checkpoint activation and DNA repair. Here we establish that human 53BP1 and MDC1 interact directly through the tandem BRCT domain of MDC1 and residues 1288-1409 of 53BP1. Following induction of DNA double strand breaks the interaction is reduced, probably due to competition between γ-H2AX and 53BP1 for the binding of the tandem BRCT domain of MDC1. Furthermore, the MDC1 binding region of 53BP1 is required for focus formation by 53BP1. During mitosis the interaction between 53BP1 and MDC1 is enhanced. The interaction is augmented in a phospho-dependent manner, and the MDC1 binding region of 53BP1 isphosphorylated in vivo in mitotic cells; therefore, it is probably modulated by cell cycle-regulated kinases. Our results demonstrate that the 53BP1-MDC1 interaction per se is required for the recruitment of 53BP1 to sites of DNA breaks, which is known to be crucial for an efficient activation of the DNA damage response. Moreover, the results presented here suggest that the interaction between 53BP1 and MDC1 plays a role in the regulation of mitosis.

Original languageAmerican English
Pages (from-to)426-435
Number of pages10
JournalJournal of Biological Chemistry
Volume284
Issue number1
DOIs
StatePublished - 2 Jan 2009

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