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Nitrogen fixation genes involved in the Bradyrhizobium japonicum‐ soybean symbiosis
Author(s) -
Hennecke Hauke
Publication year - 1990
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(90)81297-2
Subject(s) - bradyrhizobium japonicum , nitrogen fixation , nitrogenase , gene , bradyrhizobium , biology , symbiosis , promoter , effector , genetics , rhizobium , microbiology and biotechnology , gene expression , rhizobiaceae , bacteria
The symbiotic nitrogen fixation genes ( nif, fix ) of Bradyrhizobium japonicum , the root nodule endosymbiont of soybean, are organized in at least two separate chromosomal gene clusters. These genes code for proteins of the nitrogenase complex, for proteins involved in their assembly with cofactors and for putative electron transport functions. One gene, nif A , codes for a transcriptional regulatory protein that plays a central role in the control of expression of the other genes in response to the cellular oxygen status. Only at low partial pressures of O 2 will the target promoters be activated by NifA.