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Molecular and Cellular Biology, August 2001, p. 4949-4959, Vol. 21, No. 15
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.15.4949-4959.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Cdc5 Interacts with the Wee1 Kinase in Budding Yeast

Clinton R. Bartholomew, Sung Ho Woo, Yun Shin Chung, Carolyn Jones, and Christopher F. J. Hardy*

Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, Missouri 63110

Received 2 April 2001/Returned for modification 25 April 2001/Accepted 3 May 2001

Development of a multicellular organism requires that mitosis and morphogenesis be coordinated. These processes must also be synchronized during the growth of unicellular organisms. In the yeast Saccharomyces cerevisiae, mitosis is dependent on the prior growth of a daughter cell in the form of a bud. Overexpression of wild-type Polo-like kinase Cdc5 or a catalytically inactive form resulted in the formation of multinucleate cells in budding yeast. Immunofluorescence analysis of these multinulceate cells showed that mitosis and bud formation were no longer linked. Others have shown that Swe1 is required for coupling mitosis to bud formation during a perturbed cell cycle. When the normal pathway of bud formation is perturbed, Swe1 functions to delay mitosis through negative regulation of Clb/Cdk. In cells lacking Swe1, multinucleate cells are formed in response to delays in bud formation. Affinity purification, two-hybrid analysis, and mutant characterization results suggested that Cdc5 and Swe1 interact. From these results, we conclude that multinucleate formation in response to Cdc5 overexpression is linked to titration of Swe1 function. These results also suggest that Cdc5 may be a negative regulator of Swe1.

* Corresponding author. Mailing address: Department of Cell Biology and Physiology, Washington University School of Medicine, Box 8232, 660 South Euclid Ave., St. Louis, MO 63110. Phone: (314) 747-1808. Fax: (314) 362-7855. E-mail: chardy{at}genetics.wustl.edu.

Molecular and Cellular Biology, August 2001, p. 4949-4959, Vol. 21, No. 15
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.15.4949-4959.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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