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Biochim Biophys Acta. 1988 Jan 19;958(1):125-9.

Diacylglycerol acyltransferase in maturing safflower seeds: its influences on the fatty acid composition of triacylglycerol and on the rate of triacylglycerol synthesis.

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Department of Agricultural Chemistry, Kyoto Prefectural University, Japan.


Diacylglycerol acyltransferase in a particulate preparation from maturing safflower seeds showed no strict selectivity for acyl-CoA when acyl-CoA substrates were administered as mixtures. This suggested that the fatty acid composition of position 3 in safflower triacyl-sn-glycerol exclusively depends on the acyl-CoA composition in the cell. The specific activity of the acylation was approximately 3 nmol/min per mg protein of the preparation under the optimum assay conditions. This low activity and other data appeared to indicate that the diacylglycerol acyltransferase reaction may be the rate-limiting step in triacylglycerol synthesis in vivo.

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