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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
PubMed
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.

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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.

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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.