The Mre11 Complex is Required for ATM Activation and the G2/M Checkpoint

Overview

Journal EMBO J

Specialties Biotechnology
Molecular Biology

Date 2003 Dec 6

PMID 14657032

Citations 218

Authors

Christian T Carson

Rachel A Schwartz

Travis H Stracker

Caroline E Lilley

Darwin V Lee

Matthew D Weitzman

Affiliations

Soon will be listed here.

Abstract

The maintenance of genome integrity requires a rapid and specific response to many types of DNA damage. The conserved and related PI3-like protein kinases, ataxia-telangiectasia mutated (ATM) and ATM-Rad3-related (ATR), orchestrate signal transduction pathways in response to genomic insults, such as DNA double-strand breaks (DSBs). It is unclear which proteins recognize DSBs and activate these pathways, but the Mre11/Rad50/NBS1 complex has been suggested to act as a damage sensor. Here we show that infection with an adenovirus lacking the E4 region also induces a cellular DNA damage response, with activation of ATM and ATR. Wild-type virus blocks this signaling through degradation of the Mre11 complex by the viral E1b55K/E4orf6 proteins. Using these viral proteins, we show that the Mre11 complex is required for both ATM activation and the ATM-dependent G(2)/M checkpoint in response to DSBs. These results demonstrate that the Mre11 complex can function as a damage sensor upstream of ATM/ATR signaling in mammalian cells.

Citing Articles

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Reduced levels of MRE11 cause disease phenotypes distinct from ataxia telangiectasia-like disorder.

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