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Polyamines and cell wall organization in Saccharomyces cerevisiae
J J Miret1, A J Solari, P A Barderi
1Instituto de Investigaciones Bioquímicas Fundación Campomar, Buenos Aires, Argentina.
Yeast (Chichester, England)
|December 1, 1992
Summary
Polyamines are crucial for yeast cell structure. Depriving Saccharomyces cerevisiae of polyamines caused significant cell wall and membrane abnormalities, impacting cell organization.
Area of Science:
- Cell Biology
- Microbiology
- Biochemistry
Background:
- Polyamines are essential for cell growth and function.
- Saccharomyces cerevisiae is a model organism for studying cellular processes.
Purpose of the Study:
- To investigate the ultrastructural effects of polyamine depletion on Saccharomyces cerevisiae.
- To determine the role of polyamines in yeast cell wall and membrane integrity.
Main Methods:
- Cultivating an ornithine decarboxylase mutant (spe-1) of Saccharomyces cerevisiae in the absence of polyamines.
- Analyzing cellular ultrastructure using electron microscopy.
- Quantifying cell wall polysaccharide composition.
- Assessing cell wall susceptibility to enzymatic degradation.
Main Results:
- Polyamine-deprived yeast cells exhibited cytoplasmic microvacuoles, deformed nuclei, thickened cell walls with heterogeneous texture, and irregular cell membranes.
- These alterations were specific to polyamine deficiency, not general nutrient stress.
- Cell wall composition changed, with increased mannan and decreased glucan content.
- The modified cell wall showed reduced susceptibility to zymolyase.
- Abnormalities in the yeast budding pattern were observed.
Conclusions:
- Polyamines are essential for maintaining the correct structure and organization of the Saccharomyces cerevisiae cell.
- Polyamine deficiency significantly impacts yeast cell wall composition and integrity.
- The findings suggest a critical role for polyamines in cell envelope stability and morphogenesis.