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Journal of Bacteriology, August 2000, p. 4637-4639, Vol. 182, No. 16
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Effects of the Calvin Cycle on Nicotinamide Adenine Dinucleotide Concentrations and Redox Balances of Xanthobacter flavus

Geertje van Keulen, Lubbert Dijkhuizen, and Wim G. Meijer*

Department of Microbiology, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, 9750 AA Haren, The Netherlands

Received 13 March 2000/Accepted 23 May 2000

The levels of reduced and oxidized nicotinamide adenine dinucleotides were determined in Xanthobacter flavus during a transition from heterotrophic to autotrophic growth. Excess reducing equivalents are rapidly dissipated following induction of the Calvin cycle, indicating that the Calvin cycle serves as a sink for excess reducing equivalents. The physiological data support the conclusion previously derived from molecular studies in that expression of the Calvin cycle genes is controlled by the intracellular concentration of NADPH.

* Corresponding author. Present address: Department of Industrial Microbiology, Conway Institute of Biomolecular and Biomedical Research, National University of Ireland, Dublin, Belfield, Dublin 4, Ireland. Phone: 353-1-7061512. Fax: 353-1-7061183. E-mail: wim.meijer{at}ucd.ie.

Journal of Bacteriology, August 2000, p. 4637-4639, Vol. 182, No. 16
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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