Triacylglycerol synthesis in goat mammary gland. Factors influencing the esterification of fatty acids synthesized de novo

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Abstract
ATP alone had no effect on incorporation of fatty acids synthesized de novo and membrane-bound diacylglycerol into triacylglycerol. Combined addition of ATP and Mg2+ totally inhibits incorporation of fatty acids synthesized de novo and stimulated incorporation of membrane-bound diacylglycerol. ATP, Mg2+ and glycerol 3-phosphate stimulate incorporation of fatty acids synthesized de novo into triacylglycerol, but inhibited the incorporation of membrane-bound diacylglycerol. Diacylglycerol generated in situ was shown to be superior to diacylglycerols preloaded on the membrane as substrate for the diacylglycerol acyltransferase. A model is proposed to explain the effect of absorbed exogenous fatty acid on fatty acid synthesis de novo in goat mammary gland.

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