Hydrogen metabolism is closely related to other important metabolic and energetic processes of bacterial cells, such as photosynthesis, anaerobic respiration and sulphur metabolism. Even small environmental changes influence these networks through different regulatory systems. The presence or absence of oxygen is one of the most important signals; how the cascades evolved to transmit this signal in different bacteria is summarized. In many instances, hydrogen is released only under anoxic conditions, because of bioenergetic considerations. Most [NiFe] hydrogenases are inactivated by oxygen, but many of them can be re-activated under reducing conditions. In addition to direct inactivation of the hydrogenases, oxygen can also regulate their expression. The global regulatory systems [FNR (fumarate and nitrate reduction regulator), ArcAB (aerobic respiratory control) and RegAB], which respond to alterations in oxygen content and redox conditions of the environment, have an important role in hydrogenase regulation of several bacteria. FNR-like proteins were shown to be important for the regulation of hydrogenases in Escherichia coli, Thiocapsa roseopersicina and Rhizobium leguminosarum, whereas RegA protein modulates the expression of hupSL genes in Rhodobacter capsulatus.
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Conference Article|
February 01 2005
Anaerobic regulation of hydrogenase transcription in different bacteria
Á.T. Kovács;
Á.T. Kovács
1Institute of Biophysics, Biological Research Center, Hungarian Academy of Sciences and Department of Biotechnology, University of Szeged, H-6726 Szeged, Temesvári krt. 62, Hungary
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G. Rákhely;
G. Rákhely
1Institute of Biophysics, Biological Research Center, Hungarian Academy of Sciences and Department of Biotechnology, University of Szeged, H-6726 Szeged, Temesvári krt. 62, Hungary
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J. Balogh;
J. Balogh
1Institute of Biophysics, Biological Research Center, Hungarian Academy of Sciences and Department of Biotechnology, University of Szeged, H-6726 Szeged, Temesvári krt. 62, Hungary
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G. Maróti;
G. Maróti
1Institute of Biophysics, Biological Research Center, Hungarian Academy of Sciences and Department of Biotechnology, University of Szeged, H-6726 Szeged, Temesvári krt. 62, Hungary
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A. Fülöp;
A. Fülöp
1Institute of Biophysics, Biological Research Center, Hungarian Academy of Sciences and Department of Biotechnology, University of Szeged, H-6726 Szeged, Temesvári krt. 62, Hungary
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K.L. Kovács
K.L. Kovács
1
1Institute of Biophysics, Biological Research Center, Hungarian Academy of Sciences and Department of Biotechnology, University of Szeged, H-6726 Szeged, Temesvári krt. 62, Hungary
1To whom correspondence should be addressed (email kornel@brc.hu).
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Publisher: Portland Press Ltd
Received:
September 20 2004
Online ISSN: 1470-8752
Print ISSN: 0300-5127
© 2005 The Biochemical Society
2005
Biochem Soc Trans (2005) 33 (1): 36–38.
Article history
Received:
September 20 2004
Citation
Á.T. Kovács, G. Rákhely, J. Balogh, G. Maróti, A. Fülöp, K.L. Kovács; Anaerobic regulation of hydrogenase transcription in different bacteria. Biochem Soc Trans 1 February 2005; 33 (1): 36–38. doi: https://doi.org/10.1042/BST0330036
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