Hydroxymethylglutaryl-coenzyme A reductase degradation occurs in the endoplasmic reticulum, and is regulated by the mevalonate pathway. In order to discover the molecules that mediate the degradation process and its control, we conducted a genetic analysis of the degradation of the yeast Hmg2p isozyme of hydroxymethylglutaryl-coenzyme A reductase. Hmg2p degradation occurs by the action of HRD genes that direct Hmg2p to the ubiquitin-proteasome pathway. Regulation of HRD-dependent Hmg2p degradation appears to occur by the action of a separate set of CRD genes.
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Randolph Y. Hampton (1998) studied this question.
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