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• W1491433175 abstract "Microsomal 3-hydroxy-3-methylglutaryl-CoA reductase isolated from the livers of rats fed a diet containing cholestyramine (HMGR-C) is oxidized to a protein-SS-protein disulfide via a thermodynamically favorable thiol/disulfide exchange in glutathione redox buffers which approach the normal in vivo redox poise. In the presence of either substrate (NADPH or 3-hydroxy-3-methylglutaryl-CoA), the equilibrium thiol/disulfide redox behavior of HMGR-C is substantially different than that observed in the absence of substrates or in the presence of both substrates. NADPH present during redox equilibrium in a glutathione redox buffer decreases the equilibrium constant for formation of the protein-SS-protein disulfide (Kox,i) from 0.55 +/- 0.07 M to 0.18 +/- 0.02 M and increases the Kox,m for formation of an inactive protein-SS-glutathione mixed disulfide from less than 1 to 6 +/- 1. The presence of 3-hydroxy-3-methylglutaryl-CoA during redox equilibrium has a similar effect, decreasing the Kox,i for protein-SS-protein disulfide formation to 0.10 +/- 0.02 M and increasing the Kox,m for protein-SS-glutathione mixed disulfide formation to 3.8 +/- 0.9. A three-state model is developed which describes the simultaneous accumulation of protein-SS-protein and protein-SS-glutathione mixed disulfides at redox equilibrium with glutathione redox buffers. Because of the different redox behavior of the free and substrate-liganded forms of the enzyme, addition of 3-hydroxy-3-methylglutaryl-CoA or NADPH to HMGR-C at redox equilibrium results in increased reduction and activation of the enzyme." @default.
• W1491433175 created "2016-06-24" @default.
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• W1491433175 date "1990-09-01" @default.
• W1491433175 modified "2023-09-26" @default.
• W1491433175 title "The effects of NADPH and 3-hydroxy-3-methylglutaryl-CoA on the thiol/disulfide redox behavior of rat liver microsomal 3-hydroxy-3-methylglutaryl-CoA reductase." @default.
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• W1491433175 doi "https://doi.org/10.1016/s0021-9258(18)55419-3" @default.
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