Abstract
The sterol and phospholipid composition of the salt-tolerant yeast Debaryomyces hansenii was examined in cells grown to stationary phase in cultures of 0, 8 and 16% NaCl. The major free sterol component of the cells was identified by gas chromatography-mass spectrometry as ergosterol. The major phospholipid species was phosphatidylcholine (PC), followed by phosphatidylinositol (PI), phosphatidylethanolamine (PE), phosphatidylserine (PS), phosphatidylglycerol (PG) and cardiolipin. The phospholipids were composed of C 16 and C 18 acids and characterized by a high percentage of oleic acid. Growth at high concentrations of NaCl caused only minor changes in the overall fatty acid composition of the phospholipids. Similarly, the fatty acid profiles of the individual phospholipids were only slightly affected by raised salinity, the most notable change being an increased proportion of polyenoic C 18 acids in cardiolipin. At increased salinity the proportion of PS increased while that of PG, PE and PI decreased. Only minor changes were observed for the relative content of PC and cardiolipin.
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Schedule a callMore From: Biochimica et Biophysica Acta (BBA)/Lipids and Lipid Metabolism
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