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Plant and Cell Physiology, 1984, Vol. 25, No. 1 167-175
© 1984

Article

Effect of Laurie Acid on Cell Division, Macromolecular Synthesis and Membrane Lipid Organization in Escherichia coli

Hakobu Nakamura and Atsushi Hase1

Biological Institute, Fatuity of Science, Konan University Kobe 658, Japan

Laurie acid (1 mg/ml) sharply suppressed the cell division of an acrA mutant strain of Escherichia coli K12. However, the wild type acrA$ strain was resistant to the fatty acid. Capric acid and myristic acid were not so toxic. Laurie acid inhibited both DNA and protein synthesis of the acrA mutant strain, with the former being more sensitive than the latter. On the other hand, DNA polymerase activity of toluene-treated cells was stimulated rather than inhibited by the presence of 1 mg/ml of lauric acid. Fatty acid composition of phospholipids in the inner membrane was largely altered by the addition of lauric acid. These results suggest that addition of lauric acid to the medium causes a disorganization of the membrane lipids in the acrA mutant cell and activities of DNA polymerase and other intramembranous enzymes are consequently inhibited.

1Present address: Osaka City Institute of Public Health and Environmental Sciences. Osaka 543, Japan.

(Received January 28, 1983; Accepted November 15, 1983)
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