Fatty Chains of Acyl, Alkenyl, and Alkyl Phosphoglycerides of Rabbit Sarcoplasmic Reticulum

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Abstract
Choline and ethanolamine phosphoglyceride fractions were isolated from the lipid extract of rabbit sarcoplasmic reticulum. The fatty chains of the diacyl, 1-O-alkenyl-2-acyl and l-O-alkyl-2-acyl components were analyzed by selective acidic, alkaline, and enzymatic hydrolyses. Similar compositions of fatty chains at the 1- and 2-positions of l-O-alkenyl-2-acyl and l-O-alkyl-2-acyl components were observed, whereas significant differences were found between the diacyl and the other two components in ethanolamine phospho-glycerides. For choline phosphoglycerides, no structural relationship between the diacyl and the other two components could be definitely determined. These findings suggest that a metabolic relationship between the 1-O-alkenyl and 1-O-alkyl moieties may exist and, in the ethanolamine fraction, an intimate relationship of the diacyl component with ether-type phosphoglycerides can be excluded.

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