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Journal of Bacteriology, October 2000, p. 5779-5786, Vol. 182, No. 20
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

The torYZ (yecK bisZ) Operon Encodes a Third Respiratory Trimethylamine N-Oxide Reductase in Escherichia coli

Stéphanie Gon, Jean-Claude Patte, Vincent Méjean, and Chantal Iobbi-Nivol*

Laboratoire de Chimie Bactérienne, Institut de Biologie Structurale et Microbiologie, Centre Nationale de la Recherche Scientifique, 13402 Marseille Cedex 20, France

Received 1 June 2000/Accepted 2 August 2000

The bisZ gene of Escherichia coli was previously described as encoding a minor biotin sulfoxide (BSO) reductase in addition to the main cytoplasmic BSO reductase, BisC. In this study, bisZ has been renamed torZ based on the findings that (i) the torZ gene product, TorZ, is able to reduce trimethylamine N-oxide (TMAO) more efficiently than BSO; (ii) although TorZ is more homologous to BisC than to the TMAO reductase TorA (63 and 42% identity, respectively), it is located mainly in the periplasm as is TorA; (iii) torZ belongs to the torYZ operon, and the first gene, torY (formerly yecK), encodes a pentahemic c-type cytochrome homologous to the TorC cytochrome of the TorCAD respiratory system. Furthermore, the torYZ operon encodes a third TMAO respiratory system, with catalytic properties that are clearly different from those of the TorCAD and the DmsABC systems. The torYZ and the torCAD operons may have diverged from a common ancestor, but, surprisingly, no torD homologue is found in the sequences around torYZ. Moreover, the torYZ operon is expressed at very low levels under the conditions tested, and, in contrast to torCAD, it is not induced by TMAO or dimethyl sulfoxide.

* Corresponding author. Mailing address: Laboratoire de Chimie Bactérienne, Institut de Biologie Structurale et Microbiologie, Centre Nationale de la Recherche Scientifique, 31, chemin Joseph Aiguier, BP 71, 13402 Marseille Cedex 20, France. Phone: (33) 4 91 16 44 27. Fax: (33) 4 91 71 89 14. E-mail: iobbi{at}ibsm.cnrs-mrs.fr.

Journal of Bacteriology, October 2000, p. 5779-5786, Vol. 182, No. 20
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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