Plant Physiology Preview
Published on July 25, 2002; 10.1104/pp.003269
Received January 28, 2002
Returned for revision March 12, 2002
Accepted April 22, 2002
Arabidopsis Contains Nine Long-Chain Acyl-Coenzyme A Synthetase Genes That Participate in Fatty Acid and Glycerolipid Metabolism
Jay M. Shockey , Martin S. Fulda , and John A. Browse *
Institute of Biological Chemistry, Washington State University, Pullman, Washington 99164--6340 (J.M.S., M.S.F., J.A.B.); and Universität Hamburg, Institut für Allgemeine Botanik, Ohnhorststrasse 18 22609, Hamburg, Germany (M.S.F.)
* Corresponding author; email: jab{at}wsu.edu.
Long-chain acyl-coenzyme A (CoA) synthetases (LACSs) activate free fatty acids to acyl-CoA thioesters and as such play critical roles in fatty acid metabolism. This important class of enzymes factors prominently in several fatty acid-derived metabolic pathways, including phospholipid, triacylglycerol, and jasmonate biosynthesis and fatty acid ß-oxidation. In an effort to better understand the factors that control fatty acid metabolism in oilseeds, we have sought to identify and characterize genes that encode LACSs in Arabidopsis. Nine cDNAs were identified, cloned, and tested for their ability to complement a LACS-deficient strain of yeast (Saccharomyces cerevisiae). Seven of the nine successfully restored growth, whereas two cDNAs encoding putative peroxisomal isoforms did not. Lysates from yeast cells overexpressing each of the nine cDNAs were active in LACS enzyme assays using oleic acid as a substrate. The substrate specificities of the enzymes were determined after overexpression in LACS-deficient Escherichia coli. Most of the LACS enzymes displayed highest levels of activity with the fatty acids that make up the common structural and storage lipids in Arabidopsis tissues. Analysis of the tissue-specific expression profiles for these genes revealed one flower-specific isoform, whereas all others were expressed in various tissues throughout the plant. These nine cDNAs are thought to constitute the entire LACS family in Arabidopsis, and as such, will serve as powerful tools in the study of acyl-CoA metabolism in oilseeds.
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