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Demonstration of separate genetic loci encoding distinct membrane-bound respiratory NADH dehydrogenases in Escherichia coli.

School of Chemical Sciences, University of Illinois, Urbana 61801.

ABSTRACT

The nature of the Escherichia coli membrane-bound NADH dehydrogenases and their role in the generation of the proton motive force has been controversial. One E. coli NADH:ubiquinone oxidoreductase has previously been purified to homogeneity, and its corresponding gene (ndh) has been isolated. However, two biochemically distinct E. coli NADH:ubiquinone oxidoreductase activities have been identified by others (K. Matsushita, T. Ohnishi, and H. R. Kaback, Biochemistry 26:7732-7737, 1987). An insertional mutation in the ndh gene has been introduced into the E. coli chromosome, and the resulting strain maintains membrane-bound NADH dehydrogenase activity, demonstrating that a second genetically distinct NADH dehydrogenase must be present. By standard genetic mapping techniques, the map position of a second locus (nuo) involved in the oxidation of NADH has been determined. The enzyme encoded by this locus probably translocates protons across the inner membrane, contributing to the proton motive force.

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