Evidence for the existence of isoenzymes of glycerol phosphate acyltransferase

Nimmo, H.G. (1979) Evidence for the existence of isoenzymes of glycerol phosphate acyltransferase. Biochemical Journal, 177(1), pp. 283-288. (doi: 10.1042/bj1770283) (PMID:426773) (PMCID:PMC1186367)

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Subcellular-fractionation studies confirmed previous findings that rat liver glycerol phosphate acyltransferase was located in both mitochondria and the microsomal fraction. Studies of the two activities revealed several differences between them. The mitochondrial enzyme had a lower Km for sn-glycerol 3-phosphate and was more resistant to heat inactivation than was the microsomal enzyme. Some preparations of the mitochondrial enzyme were inhibited by high concentrations of glycerol phosphate. The mitochondrial enzyme was not inactivated by thiol-group reagents, whereas the microsomal enzyme was very rapidly inactivated by these compounds. However, the microsomal enzyme could be specifically protected against this inactivation by low concentrations of palmitoyl-CoA. The results indicate the existence of distinct isoenzymes of glycerol phosphate acyltransferase with different intracellular locations.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Nimmo, Professor Hugh
Authors: Nimmo, H.G.
College/School:College of Medical Veterinary and Life Sciences > School of Molecular Biosciences
Journal Name:Biochemical Journal
Publisher:Portland Press
ISSN (Online):1470-8728

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