An ATR- and Cdc7-dependent DNA damage checkpoint that inhibits initiation of DNA replication

被引：242

作者：

Costanzo, V

Shechter, D

Lupardus, PJ

Cimprich, KA

Gottesman, M

Gautier, J ^{[1
]}

机构：

[1] Columbia Univ, Dept Genet & Dev, New York, NY 10032 USA

[2] Columbia Univ, Integrated Program Cellular Mol & Biophys Studies, New York, NY 10032 USA

[3] Columbia Univ, Inst Canc Res, New York, NY 10032 USA

[4] Stanford Univ, Dept Mol Pharmacol, Stanford, CA 94305 USA

来源：

MOLECULAR CELL | 2003年 / 11卷 / 01期

关键词：

D O I：

10.1016/S1097-2765(02)00799-2

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

We have analyzed how single-strand DNA gaps affect DNA replication in Xenopus egg extracts. DNA lesions generated by etoposide, a DNA topoisomerase 11 inhibitor, or by exonuclease treatment activate a DNA damage checkpoint that blocks initiation of plasmid and chromosomal DNA replication. The checkpoint is abrogated by caffeine and requires ATR, but not ATM, protein kinase. The block to DNA synthesis is due to inhibition of Cdc7/Dbf4 protein kinase activity and the subsequent failure of Cdc45 to bind to chromatin. The checkpoint does not require pre-RC assembly but requires loading of the single-strand binding protein, RPA, on chromatin. This is the biochemical demonstration of a DNA damage checkpoint that targets Cdc7/Dbf4 protein kinase.

引用

页码：203 / 213

页数：11