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In sire determination of the functional size of hepatic 3-hydroxy-3-methylglutaryl-CoA reductase by radiation inactivation analysis

Biochimica et Biophysica Acta (BBA) - Protein Structure and Molecular Enzymology, ISSN: 0167-4838, Vol: 953, Issue: C, Page: 361-364
1988
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Radiation inactivation analysis of liver pieces yieided a target size of 210 kDa for hepatic 3-hydroxy-3-methylglutaryl CoA (HMG-CoA) reductase (( S )-mevalonate:NADP + oxidoreductase (CoA-acylating), EC 1.1.1.34) from rats fed a normal diet. Feeding a diet containing mevinolin and colestipol, which causes a marked increase in enzyme activity, resulted in a reduction of the target size to 120 kDa. These results are consistent with those obtained by radiation inactivation and immunoblotting analysis of isolated microsomes and suggest that the increase in HMG-CoA reductase activity caused by these dietary agents is accompanied by a change from a dimer to a monomer form of the enzyme.

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