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Microbiology and Molecular Biology Reviews, June 2006, p. 440-449, Vol. 70, No. 2
1092-2172/06/$08.00+0     doi:10.1128/MMBR.00049-05
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Regulation of the Cell Cycle by Protein Phosphatase 2A in Saccharomyces cerevisiae

Yu Jiang*

Department of Pharmacology, University of Pittsburgh School of Medicine, 200 Lothrop Street, Pittsburgh, Pennsylvania 15213

Protein phosphatase 2A (PP2A) has long been implicated in cell cycle regulation in many different organisms. In the yeast Saccharomyces cerevisiae, PP2A controls cell cycle progression mainly through modulation of cyclin-dependent kinase (CDK) at the G2/M transition. However, CDK does not appear to be a direct target of PP2A. PP2A affects CDK activity through its roles in checkpoint controls. Inactivation of PP2A downregulates CDK by activating the morphogenesis checkpoint and, consequently, delays mitotic entry. Defects in PP2A also compromise the spindle checkpoint and predispose the cell to an error-prone mitotic exit. In addition, PP2A is involved in controlling the G1/S transition and cytokinesis. These findings suggest that PP2A functions in many stages of the cell cycle and its effect on cell cycle progression is pleiotropic.

* Mailing address: Department of Pharmacology, University of Pittsburgh School of Medicine, 200 Lothrop Street, Pittsburgh, PA 15213. Phone: (412) 648-3390. Fax: (412) 648-1945. E-mail: jiang{at}server.pharm.pitt.edu.

Microbiology and Molecular Biology Reviews, June 2006, p. 440-449, Vol. 70, No. 2
1092-2172/06/$08.00+0     doi:10.1128/MMBR.00049-05
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



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