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Applied and Environmental Microbiology, January 2002, p. 444-447, Vol. 68, No. 1
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.1.444-447.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Transcriptional Regulation of Nostoc Hydrogenases: Effects of Oxygen, Hydrogen, and Nickel

Rikard Axelsson* and Peter Lindblad

Department of Physiological Botany, EBC, Uppsala University, SE-752 36 Uppsala, Sweden

Received 29 May 2001/ Accepted 1 October 2001

The transcription of structural genes encoding two hydrogenases in N2-fixing cultures of the cyanobacteria Nostoc muscorum and Nostoc sp. strain PCC 73102 were examined by reverse transcription-PCR. A low level of oxygen and addition of nickel induce higher transcript levels of both hydrogenases, whereas molecular hydrogen has a positive effect on the transcription of the genes encoding only the uptake hydrogenase.

* Corresponding author. Mailing address: Department of Physiological Botany, EBC, Uppsala University, Villavägen 6, SE-752 36 Uppsala, Sweden. Phone: 46-18-4712814. Fax: 46-18-4712826. E-mail: Rikard.Axelsson{at}ebc.uu.se.

Applied and Environmental Microbiology, January 2002, p. 444-447, Vol. 68, No. 1
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.1.444-447.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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