Journal
MOLECULAR CELL
Volume 11, Issue 1, Pages 203-213Publisher
CELL PRESS
DOI: 10.1016/S1097-2765(02)00799-2
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Funding
- NATIONAL CANCER INSTITUTE [R01CA092245] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES [R01GM062193, R01GM056781] Funding Source: NIH RePORTER
- NCI NIH HHS [CA92245] Funding Source: Medline
- NIGMS NIH HHS [GM062193, GM56781] Funding Source: Medline
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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.
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