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1. Microsomal diacylglycerol acyltransferase from bovine lactating mammary gland, liver and adipose tissue was capable of acylating microsomal-bound 1,2-dipalmitolyglycerol with acyl-CoA of chain length C4--C18. 2. The activity of the liver and adipose enzymes towards butyryl-CoA and hexanoyl-CoA relative to longer-chain acyl-CoA was similar to that of the mammary enzyme. The Km and V values of the three enzymes with butyryl-CoA and hexanoyl-CoA were similar, except for the V values of the adipose enzyme which were higher. 3. Microsomal diacylglycerol acyltransferase from mammary gland and liver of non-ruminants was also capable of utilizing butyryl-CoA. 4. These results indicate that the unique presence of short-chain acids in ruminant milk triacylglycerols is not caused by differences in specificity between the diacylglycerol acyltransferase from ruminant mammary and other tissues.
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