Send to

Choose Destination
See comment in PubMed Commons below
EMBO Rep. 2006 Nov;7(11):1134-9. Epub 2006 Oct 13.

DNA damage induces Cdt1 proteolysis in fission yeast through a pathway dependent on Cdt2 and Ddb1.

Author information

  • 1Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, UK.

Erratum in

  • EMBO Rep. 2007 Feb;8(2):200.


Cdt1 is an essential protein required for licensing of replication origins. Here, we show that in Schizosaccharomyces pombe, Cdt1 is proteolysed in M and G1 phases in response to DNA damage and that this mechanism seems to be conserved from yeast to Metazoa. This degradation does not require Rad3 and Cds1, indicating that it is independent of classic DNA damage and replication checkpoint pathways. Damage-induced degradation of Cdt1 is dependent on Cdt2 and Ddb1, which are components of a Cul4 ubiquitin ligase. We also show that Cdt2 and Ddb1 are needed for cell-cycle changes in Cdt1 levels in the absence of DNA damage. Cdt2 and Ddb1 have been shown to be involved in the degradation of the Spd1 inhibitor of ribonucleotide reductase after DNA damage, and we speculate that Cdt1 downregulation might contribute to genome stability by reducing demand on dNTP pools during DNA repair.

[PubMed - indexed for MEDLINE]
Free PMC Article
PubMed Commons home

PubMed Commons

How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for HighWire Icon for PubMed Central
    Loading ...
    Write to the Help Desk