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Growth-based Determination and Biochemical Confirmation of Genetic Requirements for Protein Degradation in Saccharomyces cerevisiae
Published on: February 16, 2015
Yeast bcy1 mutants with stationary phase-specific defects
V M Peck1, E K Fuge, P A Padilla
1Department of Biology, University of New Mexico, Albuquerque, NM 87131, USA.
Current Genetics
|August 1, 1997
Summary
The yeast BCY1 gene is crucial for entering stationary phase. Novel late-acting bcy1 mutants show reduced cAMP-dependent protein kinase (cAPK) activity and viability.
Area of Science:
- Cellular biology
- Molecular genetics
Background:
- The BCY1 gene in yeast encodes the regulatory subunit of cAMP-dependent protein kinase (cAPK).
- Entry into the stationary phase is a critical life cycle transition for yeast, dependent on specific genetic factors.
Purpose of the Study:
- To investigate the role of the BCY1 gene in yeast stationary phase entry.
- To characterize novel bcy1 mutants affecting cAMP-dependent protein kinase (cAPK) activity and cellular viability.
Main Methods:
- In vitro mutagenesis of the 3'-region of the BCY1 gene, focusing on cAMP-binding domains.
- Classification of bcy1 mutants into early and late-acting classes based on viability studies.
- Analysis of stationary phase-specific Bcy1p isoforms and cAPK activity in mutant strains.
Main Results:
- Identified and classified novel late-acting bcy1 mutants.
- Late-acting bcy1 mutants exhibited reduced accumulation of stationary phase-specific Bcy1p isoforms.
- These mutants displayed decreased cAPK activity and a distinct viability defect, dying after 7 days in culture.
Conclusions:
- The BCY1 gene's regulatory subunit is essential for yeast stationary phase.
- Novel late-acting bcy1 mutants reveal a previously uncharacterized role in maintaining viability during prolonged culture.
- These findings contribute to understanding yeast cell cycle regulation and stationary phase survival mechanisms.
