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Updated: Aug 13, 2026

Plant Promoter Analysis: Identification and Characterization of Root Nodule Specific Promoter in the Common Bean
Published on: December 23, 2017
A multitude of CRP/FNR-like transcription proteins in Bradyrhizobium japonicum
S Mesa1, H Hennecke, H-M Fischer
1Institute of Microbiology, Eidgenössische Technische Hochschule, CH-8093 Zürich, Switzerland. mesam@micro.biol.ethz.ch
Abstract:
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 [FixK(1), FixK(2) 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 fixK(1) and nnrR depends on FixK(2), which acts as a key distributor of the 'low-oxygen' signal perceived by the two-component regulatory system FixLJ. While the targets for FixK(1) 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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