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Journal of Lipid Research, Vol. 4, 87-90, January 1963
Copyright © 1963 by Lipid Research, Inc.

Fatty acid metabolism in Serratia marcescens: IV. The effect of temperature on fatty acid composition

D. G. Bishop and J. L. Still

Department of Biochemistry, University of Sydney, Sydney, Australia

An analysis of the fatty acids of Serratia marcescens grown at different temperatures shows that three medium-chain hydroxy acids, present in cells grown at 30°, are greatly decreased in quantity when the cells are grown at 37°. The content of unsaturated and cyclopropane acids remains unchanged. As the synthesis of unsaturated and cyclopropane acids in micro-organisms requires hydroxy acids as intermediates, it is suggested that the temperature-sensitive reaction is a reaction leading to the trapping of the hydroxy acids in a bound form. An analysis of the cellular fatty acids of a nonpigmenting strain of S. marcescens has revealed the presence of 12 unidentified acids. These acids, which constitute 36% of the total fatty acids of the "free" lipid of cells grown at 30° are almost entirely absent in cells grown at 37°.

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