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. 1983 Jun;154(3):1291–1300. doi: 10.1128/jb.154.3.1291-1300.1983

Lipid composition of Zymomonas mobilis: effects of ethanol and glucose.

V C Carey, L O Ingram
PMCID: PMC217603  PMID: 6853446

Abstract

Zymomonas mobilis is an alcohol-tolerant microorganism which is potentially useful for the commercial production of ethanol. This organism was found to contain cardiolipin, phosphatidylethanolamine, phosphatidylglycerol, and phosphatidylcholine as major phospholipids. Vaccenic acid was the most abundant fatty acid, with lesser amounts of myristic, palmitic, and palmitoleic acids. No branched-chain or cyclopropane fatty acids were found. Previous studies in our laboratory have shown that ethanol induces the synthesis of phospholipids enriched in vaccenic acid in Escherichia coli (L. O. Ingram, J. Bacteriol. 125:670-678, 1976). The fatty acid composition of Z. mobilis, an obligately ethanol-producing microorganism, represents an extreme of the trend observed in E. coli. In Z. mobilis, vaccenic acid represents over 75% of the acyl chains in the polar membrane lipids. Glucose and ethanol had no major effect on the fatty acid composition of Z. mobilis. However, both glucose and ethanol caused a decrease in phosphatidylethanolamine and phosphatidylglycerol and an increase in cardiolipin and phosphatidylcholine. Ethanol also caused a dose-dependent reduction in the lipid-to-protein ratios of crude membranes. The lipid composition of Z. mobilis may represent an evolutionary adaptation for survival in the presence of ethanol.

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Selected References

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