Regulation of 3-hydroxy-3-methylglutaryl coenzyme-A reductase activity in type II hyperlipoproteinaemia.

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Regulation of 3-hydroxy-3-methylglutaryl coenzyme-A reductase activity in type II hyperlipoproteinaemia.

The regulation of 3-hydroxy-3-methylglutaryl coenzyme-A reductase activity in leucocytes was studied in a family with familial type II hyperlipoproteinaemia (WHO classification). The propositus was heterozygous and 16 other members of the family were studied. Leucocytes were isolated by a relatively quick and simple procedure and used for enzyme estimations. The results suggest that measurement...

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3-Hydroxy-3-methylglutaryl coenzyme A reductase: regulation of enzymatic activity by phosphorylation and dephosphorylation.

The activity of microsomal 3-hydroxy-3-methylglutaryl coenzyme A reductase (HMG-CoA reductase) [mevalonate:NADP+ oxidoreductase (CoA-acylating); EC 1.1.1.34] was inhibited by ATP+Mg2+. Inactivation of HMG-CoA reductase by ATP+Mg2+ was dependent on time, temperature, and ATP concentration. Incubation of microsomal HMG-CoA reductase with [gamma-32P]ATP+Mg2+ was associated with a reciprocal increa...

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Purification of 3-hydroxy-3-methylglutaryl coenzyme A reductase.

The enzyme 3-hydroxy-3-methylglutaryl coenzyme agarose, glucose-6-phosphate dehydrogenase, and aldolA reductase from human liver was purified to homogeneity. ase were from Sigma Chemical co.; agarose-hexaneHMG-CoA was from P-L Biochemicals; bovine serum Electrophoresis of the purified human enzyme on non-denaturing gels revealed a single protein-staining band that co-migrated with reductase act...

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Defective regulation of 3-hydroxy-3-methylglutaryl coenzyme A reductase in a somatic cell mutant.

A somatic cell mutant of the CHO-K1 cell selected to be resistant to the killing effects of 25-hydroxycholesterol in the absence of cholesterol is shown to be defective in the inhibition of 3-hydroxy-3-methylglutaryl-CoA (HMG-CoA) reductase activity by 25-hydroxycholesterol, cholesterol, and lipoproteins, thus maintaining the enzyme activity found in cells in the absence of exogenous sterol con...

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ژورنال

عنوان ژورنال: BMJ

سال: 1975

ISSN: 0959-8138,1468-5833

DOI: 10.1136/bmj.4.5995.500