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J. Biol. Chem., Vol. 277, Issue 11, 9462-9467, March 15, 2002
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From the The mevalonate-dependent pathway is
used by many organisms to synthesize isopentenyl pyrophosphate, the
building block for the biosynthesis of many biologically important
compounds, including farnesyl pyrophosphate, dolichol, and many
sterols. Mevalonate kinase (MVK) catalyzes a critical phosphoryl
transfer step, producing mevalonate 5'-phosphate. The crystal structure
of thermostable MVK from Methanococcus jannaschii has been
determined at 2.4 Å, revealing an overall fold similar to the
homoserine kinase from M. jannaschii. In addition,
the enzyme shows structural similarity with mevalonate 5-diphosphate
decarboxylase and domain IV of elongation factor G. The active site of
MVK is in the cleft between its N- and C-terminal domains. Several
structural motifs conserved among species, including a
phosphate-binding loop, have been found in this cavity.
Asp155, an invariant residue among MVK sequences, is
located close to the putative phosphate-binding site and has been
assumed to play the catalytic role. Analysis of the MVK model in the
context of the other members of the GHMP kinase family offers the
opportunity to understand both the mechanism of these enzymes and the
structural details that may lead to the design of novel drugs.
The atomic coordinates and the structure factors (code 1KKH) have been deposited in the Protein Data Bank, Research Collaboratory for Structural Bioinformatics, Rutgers University, New Brunswick, NJ (http://www.rcsb.org/).
Structure of the Methanococcus jannaschii Mevalonate
Kinase, a Member of the GHMP Kinase Superfamily*
,
Department of Biochemistry and Biophysics,
Texas A&M University, College Station, Texas 77843-2128 and
¶ Department of Chemistry, Texas A&M University, College Station,
Texas 77843-3255
*
Use of the Argonne National Laboratory Structural Biology
Center beamlines at the Advanced Photon Source was supported by the Office of Energy Research, United States Department of Energy, under Contract W-31-109-ENG-38. This work was supported by the Robert
A. Welch Foundation and by a grant from the National Institutes of
Health.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.
To whom correspondence should be addressed. Tel.:
979-862-7636; Fax: 979-862-7638; E-mail: sacchett@tamu.edu.
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