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Biochem Biophys Res Commun
2015 May 08;4603:609-15. doi: 10.1016/j.bbrc.2015.03.077.
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REV1 is important for the ATR-Chk1 DNA damage response pathway in Xenopus egg extracts.
DeStephanis D
,
McLeod M
,
Yan S
.
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The translesion DNA synthesis (TLS) polymerase REV1 is implicated in the bypass of the irreparable DNA damage such as interstrand crosslinks (ICLs). However, the potential role of REV1 in DNA damage response (DDR) pathway has not been determined. In this research communication, we provide evidence to demonstrate that REV1 plays a previously unidentified but important role in the ATR-Chk1 checkpoint activation in response to mitomycin C (MMC)-induced ICLs in Xenopus egg extracts. We further pinpointed that REV1 plays a downstream role of a checkpoint protein complex assembly including ATR, ATRIP, TopBP1 and the Rad9-Rad1-Hus1 complex to MMC-induced ICLs on chromatin in the DDR pathway. Notably, domain dissection analysis demonstrates that a C-terminal domain, but not the individual ubiquitin binding motifs, of REV1 is important for the binding of REV1 to MMC-damaged chromatin and the MMC-induced Chk1 phosphorylation. Yet, the ATR-Chk1 DDR pathway appears to be dispensable for the preferential association of REV1 to MMC-damaged chromatin. Taken together, REV1 is important for the DDR pathway in Xenopus egg extracts.
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