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Journal of Bacteriology, January 1999, p. 331-333, Vol. 181, No. 1
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
(R)-Citramalate Synthase in
Methanogenic Archaea
David M.
Howell,
Huimin
Xu, and
Robert H.
White*
Department of Biochemistry, Virginia
Polytechnic Institute and State University, Blacksburg, Virginia
24061-0308
Received 18 June 1998/Accepted 19 October 1998
The Methanococcus jannaschii gene MJ1392 was cloned,
and its protein product was hyperexpressed in Escherichia
coli. The resulting protein was purified and shown to catalyze
the condensation of pyruvate and acetyl coenzyme A, with the formation
of (R)-citramalate. Thus, this gene (cimA)
encodes an (R)-citramalate synthase (CimA). This is the
first identification of this enzyme, which is likely involved in the
biosynthesis of isoleucine.
*
Corresponding author. Mailing address: Department of
Biochemistry, College of Agriculture and Life Science, Virginia
Polytechnic Institute and State University, 111 Engel Hall, Blacksburg,
VA 24061-0308. Phone: (540) 231-6605. Fax: (540) 231-9070. E-mail: rhwhite{at}vt.edu.
Journal of Bacteriology, January 1999, p. 331-333, Vol. 181, No. 1
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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