In Bradyrhizobium japonicum, the nitrogen-fixing soya bean endosymbiont and facultative denitrifier, three CRP (cAMP receptor protein)/FNR (fumarate and nitrate reductase regulatory protein)-type transcription factors [FixK1, FixK2 and NnrR (nitrite and nitric oxide reductase regulator)] have been studied previously in the context of the regulation of nitrogen fixation and denitrification. The gene expression of both fixK1 and nnrR depends on FixK2, which acts as a key distributor of the ‘low-oxygen’ signal perceived by the two-component regulatory system FixLJ. While the targets for FixK1 are not known, NnrR transduces the nitrogen oxide signal to the level of denitrification gene expression. Besides these three regulators, the complete genome sequence of this organism has revealed the existence of 13 additional CRP/FNR-type proteins whose functions have not yet been studied. Based on sequence similarity and phylogenetic analysis, we discuss in this paper the peculiarities of these additional factors.
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February 2006
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Conference Article|
January 20 2006
A multitude of CRP/FNR-like transcription proteins in Bradyrhizobium japonicum
S. Mesa;
S. Mesa
1
1Institute of Microbiology, Eidgenössische Technische Hochschule, CH-8093 Zürich, Switzerland
1 To whom correspondence should be addressed (email mesam@micro.biol.ethz.ch).
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H. Hennecke;
H. Hennecke
1Institute of Microbiology, Eidgenössische Technische Hochschule, CH-8093 Zürich, Switzerland
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H.-M. Fischer
H.-M. Fischer
1Institute of Microbiology, Eidgenössische Technische Hochschule, CH-8093 Zürich, Switzerland
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Publisher: Portland Press Ltd
Received:
September 23 2005
Online ISSN: 1470-8752
Print ISSN: 0300-5127
© 2006 The Biochemical Society
2006
Biochem Soc Trans (2006) 34 (1): 156–159.
Article history
Received:
September 23 2005
Citation
S. Mesa, H. Hennecke, H.-M. Fischer; A multitude of CRP/FNR-like transcription proteins in Bradyrhizobium japonicum. Biochem Soc Trans 1 February 2006; 34 (1): 156–159. doi: https://doi.org/10.1042/BST0340156
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