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J Bacteriol, March 1998, p. 1174-1184, Vol. 180, No. 5
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Genetic Analysis of the nuo Locus, Which Encodes the Proton-Translocating NADH Dehydrogenase in Escherichia coli

Holly J. Falk-Krzesinski and Alan J. Wolfe^*

Department of Microbiology and Immunology, Loyola University Chicago Stritch School of Medicine, Maywood, Illinois 60153

Received 23 September 1997/Accepted 16 December 1997

Complex I (EC 1.6.99.3) of the bacterium Escherichia coli is considered to be the minimal form of the type I NADH dehydrogenase, the first enzyme complex in the respiratory chain. Because of its small size and relative simplicity, the E. coli enzyme has become a model used to identify and characterize the mechanism(s) by which cells regulate the synthesis and assembly of this large respiratory complex. To begin dissecting the processes by which E. coli cells regulate the expression of nuo and the assembly of complex I, we undertook a genetic analysis of the nuo locus, which encodes the 14 Nuo subunits comprising E. coli complex I. Here we present the results of studies, performed on an isogenic collection of nuo mutants, that focus on the physiological, biochemical, and molecular consequences caused by the lack of or defects in several Nuo subunits. In particular, we present evidence that NuoG, a peripheral subunit, is essential for complex I function and that it plays a role in the regulation of nuo expression and/or the assembly of complex I.

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^* Corresponding author. Mailing address: Department of Microbiology and Immunology, Loyola University Chicago Stritch School of Medicine, 2160 S. First Ave., Building 105, Room 3822, Maywood, IL 60153. Phone: (708) 216-5814. Fax: (708) 216-9574. E-mail: awolfe{at}luc.edu.

Present address: University of Illinois at Chicago, Department of Medicine/Digestive and Liver Disease, Chicago, IL 60612.

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