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© The Rockefeller University Press, 0021-9525/2000/3/915/ $5.00
The Journal of Cell Biology, Volume 148, Number 5, March 6, 2000 915-924


Original Article

Regulation of HMG-CoA Reductase Degradation Requires the P-Type ATPase Cod1p/Spf1p

Stephen R. Cronina, Afif Khourya, Dana K. Ferrya, and Randolph Y. Hamptona
a Department of Biology, University of California San Diego, La Jolla, California, 92093-0347

Correspondence to: Randolph Y. Hampton, UCSD Department of Biology, 9500 Gilman Dr. #0347, La Jolla, CA 92093-0347. Tel:(858) 822-0511 Fax:(858) 534-0555 E-mail:rhampton{at}biomail.ucsd.edu.

The integral ER membrane protein HMG-CoA reductase (HMGR) is a key enzyme of the mevalonate pathway from which sterols and other essential molecules are produced. HMGR degradation occurs in the ER and is regulated by mevalonate-derived signals. Little is known about the mechanisms responsible for regulating HMGR degradation. The yeast Hmg2p isozyme of HMGR undergoes regulated degradation in a manner very similar to mammalian HMGR, allowing us to isolate mutants deficient in regulating Hmg2p stability. We call these mutants cod mutants for the control of HMG-CoA reductase degradation. With this screen, we have identified the first gene of this class, COD1, which encodes a P-type ATPase and is identical to SPF1. Our data suggested that Cod1p is a calcium transporter required for regulating Hmg2p degradation. This role for Cod1p is distinctly different from that of the well-characterized Ca2+ P-type ATPase Pmr1p which is neither required for Hmg2p degradation nor its control. The identification of Cod1p is especially intriguing in light of the role Ca2+ plays in the regulated degradation of mammalian HMGR.

Key Words: hydroxymethylglutaryl CoA reductase, Ca2+-transporting ATPase, ubiquitin, endoplasmic reticulum, Saccharomyces cerevisiae


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