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Journal of Bacteriology, January 1999, p. 681-684, Vol. 181, No. 2
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Control of Herbaspirillum seropedicae NifA Activity by Ammonium Ions and Oxygen

E. M. Souza,1,* F. O. Pedrosa,1 M. Drummond,2 L. U. Rigo,1 and M. G. Yates1

Department of Biochemistry and Department of Pharmacology, Universidade Federal do Paranà, Curitiba, PR, Brazil,1 and John Innes Centre, Norwich, United Kingdom2

Received 10 March 1998/Accepted 29 October 1998

The activity of a truncated form of Herbaspirillum seropedicae NifA in different genetic backgrounds showed that its regulatory domain is involved in nitrogen control but not in O2 sensitivity or Fe dependence. The model for nitrogen control involving PII could thus apply to the proteobacteria at large. NifA may have a role in controlling ADP-ribosylation of nitrogenase in Azospirillum brasilense.

* Corresponding author. Mailing address: Department of Biochemistry and Department of Pharmacology, Universidade Federal do Paranà, C. Postal 19046, CEP 81531-990, Curitiba-PR, Brazil. Phone: 5541 266 4398. Fax: 5541 266 2042. E-mail: souzaem{at}bio.ufpr.br.

Journal of Bacteriology, January 1999, p. 681-684, Vol. 181, No. 2
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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