PMID: 3757481Jan 1, 1986Paper

Acyl coenzyme A:retinol acyltransferase activity and the vitamin A content of polar bear (Ursus maritimus) liver

Comparative Biochemistry and Physiology. B, Comparative Biochemistry
M D BallJ A Olson

Abstract

Acyl coenzyme A:retinol acyltransferase activity was identified in the microsomes from a polar bear liver. The highest rate of in vitro retinol esterification was 821 pmol/min/mg microsomal protein. The in vitro esterification rate displayed a small dependence upon the concentration of exogenous protein (bovine serum albumin) and even less on the concentration of sulfhydryl-reducing agent (dithiothreitol). Vitamin A was present in the liver at a concentration of 8050 micrograms/g tissue, with 98% of the vitamin in its ester form. Retinyl palmitate was 37.3% of the total liver retinyl esters, while retinyl oleate represented 20.9%, stearate 12.8%, and linoleate 7.7%.

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Citations

Aug 30, 2000·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·P F SuraiN H Sparks
Mar 19, 2002·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Florian J SchweigertWayne T Stobo
Feb 23, 2007·Journal of Zoo and Wildlife Medicine : Official Publication of the American Association of Zoo Veterinarians·Annabelle HeierLuca N Bacciarini

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