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Journal of Bacteriology, September 2003, p. 5639-5642, Vol. 185, No. 18
0021-9193/03/$08.00+0     DOI: 10.1128/JB.185.18.5639-5642.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Disparate Oxygen Responsiveness of Two Regulatory Cascades That Control Expression of Symbiotic Genes in Bradyrhizobium japonicum

Michel-Angelo Sciotti, Astrid Chanfon, Hauke Hennecke, and Hans-Martin Fischer*

Institut für Mikrobiologie, Eidgenössische Technische Hochschule, CH-8092 Zürich, Switzerland

Received 9 April 2003/ Accepted 24 June 2003

Two oxygen-responsive regulatory systems controlling numerous symbiotic genes in Bradyrhizobium japonicum were assayed in free-living cultures for their capacity to activate target genes under different oxygen conditions. NifA- and FixLJ-controlled target genes showed disparate relative expression patterns. Induction of NifA-dependent genes was observed only at oxygen concentrations below 2% in the gas phase, whereas that of FixLJ-controlled targets progressively increased when the oxygen concentration was lowered from 21 to 5, 2, or 0.5%. We propose that this reflects a response to a gradient of increasing oxygen deprivation as bacteria invade their host during root nodule development.

* Corresponding author. Mailing address: Institut für Mikrobiologie, Eidgenössische Technische Hochschule, Schmelzbergstrasse 7, CH-8092 Zürich, Switzerland. Phone: 41 1 632 44 19. Fax: 41 1 632 11 48. E-mail: fischerh{at}micro.biol.ethz.ch.

Journal of Bacteriology, September 2003, p. 5639-5642, Vol. 185, No. 18
0021-9193/03/$08.00+0     DOI: 10.1128/JB.185.18.5639-5642.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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