Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 74:134-138 (1984)
© 1984 American Society of Plant Biologists

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Articles

In Vitro Fatty Acid Synthesis and Complex Lipid Metabolism in the Cyanobacterium Anabaena variabilis1

I. Some Characteristics of Fatty Acid Synthesis

Nora W. Lem2 and Paul K. Stumpf

Department of Biochemistry and Biophysics, University of California, Davis, California 95616

In vitro fatty acid synthesis was examined in crude cell extracts, soluble fractions, and 80% (NH4)2SO4 fractions from Anabaena variabilis M3. Fatty acid synthesis was absolutely dependent upon acyl carrier protein and required NADPH and NADH. Moreover, fatty acid synthesis and elongation occurred in the cytoplasm of the cell. The major fatty acid products were palmitic acid (16:0) and stearic acid (18:0). Of considerable interest, both stearoyl-acyl carrier protein and stearoyl-coenzyme A desaturases were not detected in any of the fractions from A. variabilis. The similarities and differences in fatty acid synthesis between A. variabilis and higher plant tissues are discussed with respect to the endosymbiotic theory of chloroplast evolution.

2 Recipient of a North Atlantic Treaty Organization Science/Postdoctoral Fellowship awarded by the Natural Sciences and Engineering Research Council of Canada. Present address: Biology Department, University of Waterloo, Waterloo, Ontario, N2L 3G1 Canada.

1 Supported in part by a National Science Foundation grant PCM79-03976.






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Copyright © 1984 by the American Society of Plant Biologists