Positional Distribution of Fatty Acids in Glycerolipids of the Marine Red Alga, Porphyra yezoensis |
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Authors: | Araki Shigeru; Sakurai Takemaro; Kawaguchi Akihiko; Murata Norio |
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Institution: | 1Yamamoto Nori Research Laboratory 5-4-6, Oomori-Higashi Oota-ku, Tokyo 143, Japan
2Department of Biology, College of Arts and Sciences, The University of Tokyo Meguro-ku, Tokyo 153, Japan
3National Institute for Basic Biology Myodaiji, Okazaki 444, Japan |
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Abstract: | The positional distribution of fatty acids in glycerolipidsfrom thalli of Porphyra yezoensis was studied by enzymatic hydrolysis.In monogalactosyl diacylglycerol, icosapentaenoic acid was amajor fatty acid at both the sn-1 and sn-2 positions of theglycerol moiety, whereas palmitic acid was a minor componentat both positions. In digalactosyl diacylglycerol and sulfoquinovosyldiacylglycerol, icosapentaenoic and palmitic acids were almostexclusively distributed at the sn-1 and sn-2 positions, respectively.In phosphatidylglycerol, palmitic and trans- -13-hexadecenoicacid were exclusively located at the sn-2 position. In phosphatidylcholine,icosapentaenoic acid occurred in both the sn-l and sn-2 positions,whereas palmitic acid was confined to the sn-1 position. Itis suggested that monogalactosyl diacylglycerol in P. yezoensissynthesized in both the cytoplasmic and chloroplastic pathways,while the diacylglycerol moieties of the other chloroplast lipidsare virtually all derived from the chloroplastic pathway. (Received March 7, 1986; Accepted April 6, 1987) |
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