Lipid biosynthesis in developing perilla seeds |
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Authors: | Ichihara Ken'ichi Suda Yasumasa |
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Institution: | Biological Chemistry, Faculty of Agriculture, Kyoto Prefectural University, Shimogamo, Kyoto 606-8522, Japan. ichihara@kpu.ac.jp |
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Abstract: | In developing seeds of Perilla frutescens var. crispa, the triacylglycerol fraction was found to accumulate between 15 and 19 days after flowering. Of this, 65% of the total fatty acids was alpha-linolenic acid in the mature seeds, with the latter being esterified in comparable amounts at all positions (sn-1, 2 and 3) of the glycerol residue. It was also demonstrated that, 1-acylglycerol-3-phosphate acyltransferase, which catalyzes esterification at the sn-2 position of the glycerol backbone, showed low activities for alpha-linolenoyl-CoA as substrate. These findings suggest that the diacylglycerol precursor for triacylglycerol synthesis is not directly derived from phosphatidic acid through the glycerol phosphate pathway. |
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Keywords: | Perilla frutescens Lamiaceae α-Linolenic acid Triacylglycerol 1-Acylglycerol-3-phosphate acyltransferase |
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