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. 1994 Jun;5(6):655–665. doi: 10.1091/mbc.5.6.655

Feedback regulation of 3-hydroxy-3-methylglutaryl coenzyme A reductase in Saccharomyces cerevisiae.

D Dimster-Denk 1, M K Thorsness 1, J Rine 1
PMCID: PMC301081  PMID: 7949422

Abstract

In eukaryotic cells all isoprenoids are synthesized from a common precursor, mevalonate. The formation of mevalonate from 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) is catalyzed by HMG-CoA reductase and is the first committed step in isoprenoid biosynthesis. In mammalian cells, synthesis of HMG-CoA reductase is subject to feedback regulation at multiple molecular levels. We examined the state of feedback regulation of the synthesis of the HMG-CoA reductase isozyme encoded by the yeast gene HMG1 to examine the generality of this regulatory pattern. In yeast, synthesis of Hmg1p was subject to feedback regulation. This regulation of HMG-CoA reductase synthesis was independent of any change in the level of HMG1 mRNA. Furthermore, regulation of Hmg1p synthesis was keyed to the level of a nonsterol product of the mevalonate pathway. Manipulations of endogenous levels of several isoprenoid intermediates, either pharmacologically or genetically, suggested that mevalonate levels may control the synthesis of Hmg1p through effects on translation.

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