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Molecular and Cellular Biology, January 1999, p. 556-566, Vol. 19, No. 1
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

The Nuclease Activity of Mre11 Is Required for Meiosis but Not for Mating Type Switching, End Joining, or Telomere Maintenance

Sylvie Moreau, John R. Ferguson, and Lorraine S. Symington*

Institute of Cancer Research and Department of Microbiology, Columbia University College of Physicians and Surgeons, New York, New York 10032

Received 25 August 1998/Returned for modification 21 September 1998/Accepted 29 September 1998

The Saccharomyces cerevisiae MRE11 gene is required for the repair of ionizing radiation-induced DNA damage and for the initiation of meiotic recombination. Sequence analysis has revealed homology between Mre11 and SbcD, the catalytic subunit of an Escherichia coli enzyme with endo- and exonuclease activity, SbcCD. In this study, the purified Mre11 protein was found to have single-stranded endonuclease activity. This activity was absent from mutant proteins containing single amino acid substitutions in either one of two sequence motifs that are shared by Mre11 and SbcD. Mutants with allele mre11-D56N or mre11-H125N were partially sensitive to ionizing radiation but lacked the other mitotic phenotypes of poor vegetative growth, hyperrecombination, defective nonhomologous end joining, and shortened telomeres that are characteristic of the mre11 null mutant. Diploids homozygous for the mre11-H125N mutation failed to sporulate and accumulated unresected double-strand breaks (DSB) during meiosis. We propose that in mitotic cells DSBs can be processed by other nucleases that are partially redundant with Mre11, but these activities are unable to process Spo11-bound DSBs in meiotic cells.


* Corresponding author. Mailing address: Institute of Cancer Research and Department of Microbiology, Columbia University College of Physicians and Surgeons, 701 W. 168th St., New York, NY 10032. Phone: (212) 305-4793. Fax: (212) 305-1741. E-mail: lss5{at}columbia.edu.


Molecular and Cellular Biology, January 1999, p. 556-566, Vol. 19, No. 1
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.



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