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J. Bacteriol., 08 1995, 4321-4326, Vol 177, No. 15
L Thony-Meyer, F Fischer, P Kunzler, D Ritz and H Hennecke
The so-called aeg-46.5 region of Escherichia coli contains genes whose
expression is induced under anaerobic growth conditions in the presence of
nitrate or nitrite as the terminal electron acceptor. In this work, we have
examined more closely several genes of this cluster, here designated
ccmABCDEFGH, that are homologous to two separate Bradyrhizobium japonicum
gene clusters required for the biogenesis of c- type cytochromes. A
deletion mutant of E. coli which lacked all of these genes was constructed.
Maturation of indigenous c-type cytochromes synthesized under anaerobic
respiratory conditions, with nitrite, nitrate, or trimethylamine N-oxide as
the electron acceptor, was found to be defective in the mutant. The
biogenesis of foreign cytochromes, such as the soluble B. japonicum
cytochrome c550 and the membrane-bound Bacillus subtilis cytochrome c550,
was also investigated. None of these cytochromes was synthesized in its
mature form when expressed in the mutant, as opposed to the situation in
the wild type. The results suggest that the E. coli ccm gene cluster
present in the aeg-46.5 region is required for a general pathway involved
in cytochrome c maturation.
Copyright © 1995, American Society for Microbiology
Escherichia coli genes required for cytochrome c maturation
Mikrobiologisches Institut, Eidgenossische Technische Hochschule, Zurich, Switzerland.
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