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- W2086462010 abstract "3-Hydroxy-3-methylglutaryl coenzyme A reductase (HMG CoA reductase) is a single polypeptide chain with two contiguous domains: a soluble domain (548 amino acids) that catalyzes the rate-controlling step in cholesterol synthesis and a membrane-bound domain (339 amino acids) that anchors the protein to the endoplasmic reticulum (ER). HMG CoA reductase is degraded at least 10-fold more rapidly than other ER proteins; degradation is accelerated in the presence of cholesterol. To understand this controlled degradation, we transfected reductase-deficient Chinese hamster ovary (CHO) cells with a plasmid expression vector containing a reductase cDNA that lacks the segment encoding the membrane domain. The plasmid produced a truncated reductase (37 kd smaller than normal) that was enzymatically active with normal kinetics; most of the truncated enzyme was found in the cytosol. The truncated enzyme was degraded one-fifth as fast as the holoenzyme; degradation was no longer accelerated by sterols. We conclude that the membrane-bound domain of reductase plays a crucial role in the rapid and regulated degradation of this ER protein." @default.
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- W2086462010 date "1985-05-01" @default.
- W2086462010 modified "2023-10-09" @default.
- W2086462010 title "Membrane-bound domain of HMG CoA reductase is required for sterol-enhanced degradation of the enzyme" @default.
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- W2086462010 doi "https://doi.org/10.1016/0092-8674(85)90078-9" @default.
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