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. 1991 May;173(10):3101–3108. doi: 10.1128/jb.173.10.3101-3108.1991

The phosphoinositol sphingolipids of Saccharomyces cerevisiae are highly localized in the plasma membrane.

J L Patton 1, R L Lester 1
PMCID: PMC207903  PMID: 1827112

Abstract

To investigate the vital function(s) of the phosphoinositol-containing sphingolipids of Saccharomyces cerevisiae, we measured their intracellular distribution and found these lipids to be highly localized in the plasma membrane. Sphingolipids were assayed in organelles which had been uniformly labeled with [3H]inositol or 32P and by chemical measurements of alkali-stable lipid P, of long chain bases, and of very long chain fatty acids. We have developed an improved method for the preparation of plasma membranes which is based on the procedure of Duran et al. (Proc. Natl. Acad. Sci. USA 72:3952-3955, 1975). On the basis of marker enzyme and DNA assays carried out with a number of preparations, the plasma membranes contained less than 10% vacuolar membranes (alpha-mannosidase) and nuclei (DNA); the contamination by the endoplasmic reticulum (NADPH-cytochrome c reductase) varied from 0 to 20%. The plasma membrane preparations showed a 13-fold increase in the specific activity of vanadate-sensitive ATPase, compared with that in the homogenate, with a yield ranging from 50 to 80%. A comparison of the distribution of the ATPase with that of sphingolipids assayed by a variety of methods showed that 80 to 100% of the sphingolipids are localized in the plasma membrane; the sphingolipids constitute about 30% of the total phospholipid content of the plasma membrane. Minor amounts of sphingolipids that were found in isolated mitochondria and nuclei can be attributed to the presence of small amounts of plasma membrane in these fractions. These results suggest that one or more essential functions of these lipids is in the plasma membrane. Furthermore, sphingolipids may be useful chemical markers of the plasma membrane of S. cerevisiae.

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Selected References

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