Relation between Cyclopropane Fatty Acid Formation and Saturation of Phospholipid Species in Escherichia coli K-12

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Alterations in the degrees of saturation of phosphatidylethanolamine, phosphatidylglycerol and cardiolipin of Escherichia coli K-12 were determined after raising or lowering the growth temperature during the exponential growth phase. After raising the growth temperature from 17 to 42°C, the cells continued to grow with increasing degrees of saturation of the three phospholipids. cis-9, 10-Methylenehexadecanoic acid increased only in phosphatidylethanolamine. During growth after lowering the growth temperature from 42 to 17°C, no increase was found in cyclopropane fatty acid content of phosphatidylethanolamine, in which cis-vaccenic acid increased. Significance of cyclopropane fatty acid formation in phospholipids was discussed.