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Genetic evidence for a functional interaction between Saccharomyces cerevisiae CDC24 and CDC42
1Department of Microbiology and Molecular Genetics, University of Vermont, Burlington 05401.
Yeast (Chichester, England)
|April 1, 1994
Summary
Cdc24p and Cdc42p, key regulators of yeast cell polarity, interact within the cell. Genetic studies reveal their functional relationship, suggesting Cdc24p modulates Cdc42p activity in Saccharomyces cerevisiae.
Area of Science:
- Cell Biology
- Molecular Genetics
- Biochemistry
Background:
- Cdc24p and Cdc42p regulate cell polarity in Saccharomyces cerevisiae.
- Cdc42p is a Ras GTPase; Cdc24p resembles Dbl oncoprotein, a guanine-nucleotide exchange factor for human Cdc42p.
Purpose of the Study:
- To investigate the functional interaction between Cdc24p and Cdc42p in yeast.
- To determine if Cdc24p regulates Cdc42p activity.
Main Methods:
- Genetic interaction studies in Saccharomyces cerevisiae.
- Analysis of gene overexpression effects.
- Characterization of double mutant phenotypes (ts and dominant-negative alleles).
Main Results:
- Overexpression of Cdc24p suppressed a dominant-negative cdc42 allele.
- Co-overexpression of CDC24 and CDC42 was lethal, causing loss of cell polarity.
- A cdc24ts cdc42ts double mutant displayed synthetic lethality.
Conclusions:
- Cdc24p and Cdc42p genetically interact in yeast.
- Cdc24p likely plays a role in regulating Cdc42p activity.
- These proteins are crucial for maintaining cell polarity during the cell cycle.