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Originally published In Press as doi:10.1074/jbc.M105900200 on December 3, 2001

J. Biol. Chem., Vol. 277, Issue 5, 3141-3149, February 1, 2002
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Interaction with the Small Subunit of Geranyl Diphosphate Synthase Modifies the Chain Length Specificity of Geranylgeranyl Diphosphate Synthase to Produce Geranyl Diphosphate*

Charles Burke and Rodney CroteauDagger

From the Institute of Biological Chemistry, Program in Plant Physiology, Washington State University, Pullman, Washington 99164-6340

Geranyl diphosphate synthase belongs to a subgroup of prenyltransferases, including farnesyl diphosphate synthase and geranylgeranyl diphosphate synthase, that catalyzes the specific formation, from C5 units, of the respective C10, C15, and C20 precursors of monoterpenes, sesquiterpenes, and diterpenes. Unlike farnesyl diphosphate synthase and geranylgeranyl diphosphate synthase, which are homodimers, geranyl diphosphate synthase from Mentha is a heterotetramer in which the large subunit shares functional motifs and a high level of amino acid sequence identity (56-75%) with geranylgeranyl diphosphate synthases of plant origin. The small subunit, however, shares little sequence identity with other isoprenyl diphosphate synthases; yet it is absolutely required for geranyl diphosphate synthase catalysis. Coexpression in Escherichia coli of the Mentha geranyl diphosphate synthase small subunit with the phylogenetically distant geranylgeranyl diphosphate synthases from Taxus canadensis and Abies grandis yielded a functional hybrid heterodimer that generated geranyl diphosphate as product in each case. These results indicate that the geranyl diphosphate synthase small subunit is capable of modifying the chain length specificity of geranylgeranyl diphosphate synthase (but not, apparently, farnesyl diphosphate synthase) to favor the production of C10 chains. Comparison of the kinetic behavior of the parent prenyltransferases with that of the hybrid enzyme revealed that the hybrid possesses characteristics of both geranyl diphosphate synthase and geranylgeranyl diphosphate synthase.

* This work was supported in part by a grant from the United States Department of Energy, Division of Energy Biosciences, and by Project 0268 from the Agricultural Research Center, Washington State University.The costs of publication of this article were defrayed in part by the payment of page charges. The article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

The nucleotide sequence(s) reported in this paper has been submitted to the GenBankTM/EBI Data Bank with accession number(s) AF384040 and AF425235.

Dagger To whom correspondence should be addressed: Institute of Biological Chemistry, Washington State University, Pullman, WA 99164-6340. Tel.: 509-335-1790; Fax: 509-335-7643; E-mail: croteau@mail.wsu.edu.

Copyright © 2002 by The American Society for Biochemistry and Molecular Biology, Inc.
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