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doi:10.1534/genetics.105.053876
A more recent version of this article appeared on April 1, 2006.
REGULAR RESEARCH PAPERS |
Smc5p Promotes Faithful Chromosome Transmission and DNA Repair in S. cerevisiae
Gregory J. Cost 1 and Nicholas R. Cozzarelli 1*
1 University of California, Berkeley
* To whom correspondence should be addressed. E-mail: ncozzare{at}socrates.berkeley.edu.
Submitted on November 23, 2005
Revised on December 30, 2005
Accepted on 21 January 2006
Heterodimers of structural maintenance of chromosomes (SMC) proteins form the core of several protein complexes involved in the organization of DNA, including condensation and cohesion of the chromosomes at metaphase. The functions of the complexes with a heterodimer of Smc5p and Smc6p are less clear. To better understand them, we created two S. cerevisiae strains bearing temperature-sensitive alleles of SMC5. When shifted to the restrictive temperature, both mutants lose viability gradually, concomitant with the appearance of nuclear abnormalities and phosphorylation of the Rad53p DNA damage checkpoint protein. Removal of Rad52p or over-expression of the SUMO ligase Mms21p partially suppresses the temperature sensitivity of smc5 strains, and increases their survival at the restrictive temperature. At the permissive temperature, smc5-31 but not smc5-33 cells exhibit hypersensitivity to several DNA damaging agents despite induction of the DNA damage checkpoint. Similarly, smc5-31 but not smc5-33 cells are killed by over-expression of the SUMO ligase-defective Mms21-SAp but not by over-expression of wild-type Mms21p. Both smc5 alleles are synthetically lethal with mms21-SA, and exhibit Rad52p-independent chromosome fragmentation and loss at semi-permissive temperatures. Our data indicate a critical role for the S. cerevisiae Smc5/6-containing complexes in both DNA repair and chromosome segregation.
Key Words: DNA damage, Mms21, Nse2, Smc6, sumoylation
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