Cdc20, a β-transducin homologue, links RAD9-mediated G2/M checkpoint control to mitosis in Saccharomyces cerevisiae
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In the budding yeast Saccharomyces cerevisiae, the DNA damage-induced G2 arrest requires the checkpoint control genes RAD9, RAD17, RAD24, MEC1, MEC2 and MEC3. These genes also prevent entry into mitosis of a temperature-sensitive mutant, cdc13, that accumulates chromosome damage at 37° C. Here we show that a cdc13 mutant overexpressing Cdc20, a β-transducin homologue, no longer arrests in G2 at the restrictive temperature but instead undergoes nuclear division, exits mitosis and enters a subsequent division cycle, which suggests that the DNA damage-induced G2/M checkpoint control is not functional in these cells. This is consistent with our observation that overexpression of CDC20 in wild-type cells results in increased sensitivity to UV irradiation. Overproduction of Cdc20 does not influence the arrest phenotype of the cdc mutants whose cell cycle block is independent of RAD9-mediated checkpoint control. Therefore, we suggest that the DNA damage-induced checkpoint controls prevent mitosis by inhibiting the nuclear division pathway requiring CDC20 function.
- Cdc20, a β-transducin homologue, links RAD9-mediated G2/M checkpoint control to mitosis in Saccharomyces cerevisiae
Molecular and General Genetics MGG
Volume 253, Issue 1-2 , pp 138-148
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- Key words Checkpoint control
- Yeast cell cycle
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