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Journal of Bacteriology, January 2005, p. 388-391, Vol. 187, No. 1
0021-9193/05/$08.00+0     doi:10.1128/JB.187.1.388-391.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

The Mrp Na⁺/H⁺ Antiporter Increases the Activity of the Malate:Quinone Oxidoreductase of an Escherichia coli Respiratory Mutant

Department of Pharmacology and Biological Chemistry, Mount Sinai School of Medicine, New York, New York,¹ Department of Life Sciences, Toyo University, Itakura-machi, Gunma, Japan²

Received 23 August 2004/ Accepted 29 September 2004

Mrp catalyzes secondary Na⁺/H⁺ antiport and was hypothesized to have an additional primary energization mode. Mrp-dependent complementation of nonfermentative growth of an Escherichia coli respiratory mutant supported this hypothesis but is shown here to be related to increased expression of host malate:quinone oxidoreductase, not to catalytic activity of Mrp.

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