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The action of phosphatidate phosphatase on the fatty-acid composition of safflower triacylglycerol and spinach glycerolipids

โœ Scribed by Ken'ichi Ichihara

Publisher
Springer-Verlag
Year
1991
Tongue
English
Weight
612 KB
Volume
183
Category
Article
ISSN
0032-0935

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โœฆ Synopsis

The microsomal phosphatidate phosphatase (EC 3.1.3.4) in maturing seeds of safflower (Carthamus tinctorius L.) was specific and selective for unsaturated phosphatidates. The relative order of specificity for phosphatidate molecular species was 1

The order of selectivity was similar to that of the specificity. The broad selectivity for unsaturated phosphatidate species (1,2-di-unsaturated-acyl and 1-saturated-acyl -2-unsaturatedacyl) led us to conclude that the phosphatidate-phosphatase reaction does not, or only very little, affect the fattyacid composition of the diacylglycerol product and in turn the fatty-acid composition of triacylglycerol in safflower oil. As compared with the safflower microsomal enzyme, the chloroplast phosphatidate phosphatase of spinach (Spinacia oleracea L.) leaves showed a broader specificity. This agreed with the selectivity profile indicated by labelling patterns of phosphatidate and diacylglycerol synthesized from [ a 4C]acetat e in spinach chloroplasts (S.E.

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