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Journal of Bacteriology, December 1998, p. 6392-6395, Vol. 180, No. 23
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Short-Term Regulation of Nitrogenase Activity by NH4+ in Rhodobacter capsulatus: Multiple In Vivo Nitrogenase Responses to NH4+ Addition

Alexander F. Yakunin and Patrick C. Hallenbeck*

Département de Microbiologie et Immunologie, Université de Montréal, Montréal, Québec H3C 3J7, Canada

Received 30 July 1998/Accepted 28 September 1998

The photosynthetic bacterium Rhodobacter capsulatus has been shown to carry out nitrogenase "switch-off," a rapid, reversible inhibition of in vivo activity. Here, we demonstrate that highly nitrogen-limited cultures of both the wild-type strain and a draT draG mutant are capable of nitrogenase switch-off while moderately nitrogen-limited cultures show instead a "magnitude" response, with a decrease in in vivo nitrogenase activity that is proportional to the amount of added NH4+.

* Corresponding author. Mailing address: Département de Microbiologie et Immunologie, Université de Montréal, C.P. 6128, succursale Centre-ville, Montréal, Québec H3C 3J7, Canada. Phone: (514) 343-6278. Fax: (514) 343-5701. E-mail: patrick.hallenbeck{at}umontreal.ca.

Journal of Bacteriology, December 1998, p. 6392-6395, Vol. 180, No. 23
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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