Sterol and phospholipid acyl chain alterations inSaccharomyces cerevisiae secretion mutants as a function of temperature stress |
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Authors: | Christopher Low Leo W Parks |
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Affiliation: | (1) Department of Microbiology, North Carolina State University, Box 7615, 27695 Raleigh, NC |
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Abstract: | Analyses of free sterol, steryl ester and fatty acid components from yeast secretion mutants indicated that free and esterified
sterol remained relatively constant over a growth range of 24 C to 34 C. The saturated fatty acid components (16∶0 and 18∶0)
increased while the unsaturated fatty acids (16∶1 and 18∶1) decreased as the growth temperature increased. In secretory mutants,
fatty acid composition changes are more pronounced than in the wild-type strain. A shift toward increased saturated and decreased
unsaturated fatty acid was observed when cells were subjected to a 2-hr temperature upshift to 37 C. Steady-state fluorescence
anisotropy data indicated that modifications to the lipid component of yeast plasma membrane produced lipid thermotropic transitions
that were 3 C to 6 C higher in yeast cells subjected to thermal stress. |
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Keywords: | |
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