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Journal of Bacteriology, July 2002, p. 4044-4047, Vol. 184, No. 14
0021-9193/02/$04.00+0     DOI: 10.1128/JB.184.14.4044-4047.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

The fixA and fixB Genes Are Necessary for Anaerobic Carnitine Reduction in Escherichia coli

Angelique Walt and Michael L. Kahn*

Institute of Biological Chemistry and School of Molecular Biosciences, Washington State University, Pullman, Washington 99164-6340

Received 5 November 2001/ Accepted 26 April 2002

In Escherichia coli, the use of carnitine as a terminal electron acceptor depends on a functional caiTABCDE operon. It had been suggested that the adjacent but divergent fixABCX operon is also required for carnitine metabolism, perhaps to provide electrons for carnitine reduction. We have constructed E. coli fixA and fixB mutants and find that they are unable to reduce carnitine to {gamma}-butyrobetaine under anaerobic conditions.

* Corresponding author. Mailing address: Institute of Biological Chemistry, Washington State University, Pullman, WA 99164-6340. Phone: (509) 335-8327. Fax: (509) 335-7643. E-mail: kahn{at}wsu.edu.

Journal of Bacteriology, July 2002, p. 4044-4047, Vol. 184, No. 14
0021-9193/02/$04.00+0     DOI: 10.1128/JB.184.14.4044-4047.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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