The G(2) DNA damage checkpoint targets both Wee1 and Cdc25
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چکیده
منابع مشابه
The G(2) DNA damage checkpoint targets both Wee1 and Cdc25.
The onset of mitosis is controlled by the cyclin dependent kinase Cdc2p. Cdc2p activity is controlled through the balance of phosphorylation and dephosphorylation of tyrosine-15 (Y15) by the Wee1p kinase and Cdc25p phosphatase. In the fission yeast Schizosaccharomyces pombe, detection of DNA damage in G(2) activates a checkpoint that prevents entry into mitosis through the maintenance of Y15 ph...
متن کاملChk1 is a wee1 kinase in the G2 DNA damage checkpoint inhibiting cdc2 by Y15 phosphorylation.
The G2 DNA damage checkpoint ensures maintenance of cell viability by delaying progression into mitosis in cells which have suffered genomic damage. It is controlled by a number of proteins which are hypothesized to transduce signals through cell cycle regulators to delay activation of p34cdc2. Studies in mammalian cells have correlated induction of inhibitory tyrosine 15 (Y15) phosphorylation ...
متن کاملA predictive mathematical model of the DNA damage G2 checkpoint.
A predictive mathematical model of the transition from the G2 phase in the cell cycle to mitosis (M) was constructed from the known interactions of the proteins that are thought to play significant roles in the G2 to M transition as well as the DNA damage- induced G2 checkpoint. The model simulates the accumulation of active cyclin B1/Cdk1 (MPF) complexes in the nucleus to activate mitosis, the...
متن کاملNuclear exclusion of Cdc25 is not required for the DNA damage checkpoint in fission yeast
Maintenance of genome integrity requires a checkpoint that restrains mitosis in response to DNA damage [1]. This checkpoint is enforced by Chk1, a protein kinase that targets Cdc25 [2--7]. Phosphorylated Cdc25 associates with 14-3-3 proteins, which appear to occlude a nuclear localization signal (NLS) and thereby inhibit Cdc25 nuclear import [6, 8--14]. Proficient checkpoint arrest is thought t...
متن کاملIdentification of decatenation G2 checkpoint impairment independently of DNA damage G2 checkpoint in human lung cancer cell lines.
It has been suggested that attenuation of the decatenation G(2) checkpoint function, which ensures sufficient chromatid decatenation by topoisomerase II before entering into mitosis, may contribute to the acquisition of genetic instability in cancer cells. To date, however, very little information is available on this type of checkpoint defect in human cancers. In this study, we report for the ...
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ژورنال
عنوان ژورنال: Journal of Cell Science
سال: 2000
ISSN: 1477-9137,0021-9533
DOI: 10.1242/jcs.113.10.1727