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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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