Whi5 Regulation by Site Specific CDK-Phosphorylation in Saccharomyces cerevisiae
Author Information
Author(s): Michelle V. Wagner, Marcus B. Smolka, Rob A. M. de Bruin, Huilin Zhou, Curt Wittenberg, Steven F. Dowdy
Primary Institution: University of California San Diego School of Medicine
Hypothesis
The study investigates the role of specific CDK phosphorylation sites on the Whi5 transcriptional repressor in regulating cell cycle progression in yeast.
Conclusion
The study concludes that specific CDK phosphorylation sites on Whi5 are critical for its inactivation and regulation of cell size, but hypo-phosphorylation is not essential for its repressive function.
Supporting Evidence
- Whi5 is a negative regulator of G1 cell cycle progression in yeast.
- Phosphorylation of Whi5 by CDK is important for its inactivation.
- Specific CDK sites on Whi5 are necessary for its function in cell cycle regulation.
- Whi5 phosphorylation mutants were able to rescue the small cell size of whi5Δ cells.
Takeaway
Whi5 helps control when yeast cells divide, and certain chemical changes to it are important for its job, but not all changes are necessary for it to work.
Methodology
The study used mass spectrometry to analyze Whi5 phosphorylation sites and assessed the functionality of Whi5 phosphorylation mutants in yeast cell cultures.
Limitations
The study does not explore the biological function of non-CDK phosphorylation sites on Whi5.
Digital Object Identifier (DOI)
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