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Effect of Substrate on the Fatty Acid Composition of Hydrocarbon-utilizing Microorganisms¹

^a Department of Microbiology, North Carolina State University, Raleigh, North Carolina 27607

ABSTRACT

The fatty acid pattern in three hydrocarbon-utilizing bacteria during growth on various substrates was examined. The predominant fatty acids in acetate-grown cells were C₁₆, C_16:1, C_18:1, and Br—C₁₉ and the major fatty acids in propane-grown cells were C₁₅, C₁₇, C_17:1, C_18:1, and Br—C₁₈. When one organism (Mycobacterium sp. strain OFS) was grown on the n-alkanes from C₁₃ to C₁₇, the major fatty acid in the cells was of the same chain length as the substrate. Studies on the incorporation of acetate into the cellular fatty acids of microorganisms growing on C₁₅ and C₁₇n-alkanes suggest that the oxidative products of the substrate are incorporated into the cellular fatty acids without degradation to acetate.

¹ Paper number 2474 of the Journal Series of the North Carolina State University Agricultural Experiment Station, Raleigh, N.C. 27606.

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