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Published online 7 October 2002. doi:10.1083/jcb.200206120
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© The Rockefeller University Press, 0021-9525/2002/10/23 $5.00
The Journal of Cell Biology, Volume 159, Number 1, 23-28


Report

The yeast DHHC cysteine-rich domain protein Akr1p is a palmitoyl transferase



Amy F. Roth1, Ying Feng2, Linyi Chen2 and Nicholas G. Davis1,2

1 Department of Surgery, Wayne State University School of Medicine, Detroit, MI 48201
2 Department of Pharmacology, Wayne State University School of Medicine, Detroit, MI 48201

Address correspondence to Nicholas G. Davis, Departments of Surgery and Pharmacology, Wayne State University School of Medicine, Elliman Building, Room 1205, 421 E. Canfield, Detroit, MI 48201. Tel.: (313) 577-7807. Fax: (313) 577-7642. E-mail: ndavis{at}cmb.biosci.wayne.edu

Protein palmitoylation has been long appreciated for its role in tethering proteins to membranes, yet the enzymes responsible for this modification have eluded identification. Here, experiments in vivo and in vitro demonstrate that Akr1p, a polytopic membrane protein containing a DHHC cysteine-rich domain (CRD), is a palmitoyl transferase (PTase). In vivo, we find that the casein kinase Yck2p is palmitoylated and that Akr1p function is required for this modification. Akr1p, purified to near homogeneity from yeast membranes, catalyzes Yck2p palmitoylation in vitro, indicating that Akr1p is itself a PTase. Palmitoylation is stimulated by added ATP. Furthermore, during the reaction, Akr1p is itself palmitoylated, suggesting a role for a palmitoyl-Akr1p intermediate in the overall reaction mechanism. Mutations introduced into the Akr1p DHHC-CRD eliminate both the trans- and autopalmitoylation activities, indicating a central participation of this conserved sequence in the enzymatic reaction. Finally, our results indicate that palmitoylation within the yeast cell is controlled by multiple PTase specificities. The conserved DHHC-CRD sequence, we propose, is the signature feature of an evolutionarily widespread PTase family.

Key Words: acylation; Saccharomyces cerevisiae; palmitoyl coenzyme A; Akr1p protein; acyltransferases


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