Abstract
Recent work has shown that esterification of retinol in microsomes from rat liver, mammary gland and small intestine and from human small intestine is catalyzed by an acyl CoA: retinol acyl transferase (ARAT). The current study demonstrates ARAT activity in human liver microsomes. At optimal incubation conditions the rate of retinyl ester formation due to ARAT (0.37 +/- 0.31 nmole ester formed X mg microsomal protein-1 X minute-1, mean +/- SD, n = 6) suggests that the enzyme is of physiological importance.
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