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. 1972 Oct;112(1):398–407. doi: 10.1128/jb.112.1.398-407.1972

Microbial Assimilation of Hydrocarbons: Cellular Distribution of Fatty Acids

R A Makula 1, W R Finnerty 1
PMCID: PMC251424  PMID: 5079069

Abstract

The distribution of cellular fatty acids in defined lipid classes was analyzed in Micrococcus cerificans after growth on specified hydrocarbons. Neutral lipid, phospholipid, and cell residue fatty acids were qualitatively and quantitatively determined for M. cerificans grown on nutrient broth, tetradecane (C14), pentadecane (C15), hexadecane (C16), and heptadecane (C17), respectively. Percentage of total cellular fatty acid localized in defined lipid classes from cells grown on the above growth substrates was (i) neutral lipid—11.8, 1.81, 7.74, 23.1, and 2%; (ii) phospholipid—74.5, 65, 66.43, 62.1, and 86%; (iii) cell residue lipid—13.5, 33.29, 25.82, 14.78, and 11.9%. Phospholipid fatty acid chain length directly reflected the carbon number of the alkane substrate, with 40, 84, 98, and 77% of the fatty acids being 14, 15, 16, and 17 carbons when cells were grown on C14, C15, C16, and C17n-alkanes, respectively. The bound lipids of the cell residue after chloroform-methanol extraction were characterized by 2-hydroxydodecanoic and 2-hydroxytetradecanoic acids plus a broad spectrum of fatty acids ranging from C10 to C17 chain length. An increase in total unsaturated fatty acid localized in the phospholipids was noted from cells grown on alkanes greater than 15 carbons long. An extracellular accumulation of free fatty acid (FFA) was demonstrated in hexadecane-grown cultures that was not apparent in non-hydrocarbon-grown cultures. Identification of extracellular FFA demonstrated direct derivation from hexadecane oxidation. Studies supporting inhibition of de novo fatty acid biosynthesis in relationship to extracellular FFA and hexadecane oxidation are described. The ability to alter the fatty acid composition of membrane polar lipids in a predictable manner by the alkane carbon source provides an excellent model system for the investigation of membrane structure-function relationships in M. cerificans.

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Selected References

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