Abstract
The cytoplasmic membranes (CM) and thylakoid membranes (TM) were isolated from the thermophilic cyanobacterium Synechococcus elongatus. These membranes contained similar rates of polarlipid classes; monogalactosyldiacylglycerol (MGDG) (ca. 58 %), digalactosyldiacylglycerol (DGDG) (ca. 16 %), sulfoquinovosyldiacylglycerol (SQDG) (ca. 11 %) and phosphatidylglycerol (PG) (ca. 8 %). In either membranes, about 50 % of the total lipid consisted of pigments, of which about two thirds was chlorophyll-a in TM, while in CM chlorophyll-a was at a trace amount. The remains of the pigmentswere supposed to be carotenoids in either membranes. Of the fatty acids of the lipids in either membranes, palmitic acid (16 : 0) comprised more than 50 %, oleic acid (18 : 1) about 20 %, cis-9-hexadecenoic acid (palmitoleic acid; 16 : 1) about 15 %, stearic acid (18 : 0) about 10 %. Comparing with mesophilic cyanobacteria, the Synechococcus membranes contained more pigments, less PG and more saturated fatty acids, and showed simpler profiles of fatty acid compositions.
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