Regulation of nitrogen fixation in Azospirillum brasilense

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Abstract

The regulation of nitrogen fixation in Azospirillum brasilense is very complicated, and it responds to exogenous fixed nitrogen or a change of oxygen concentration. This regulation occurs at both transcriptional and posttranslational levels. Unlike regulation seen in Klebsiella pneumoniae, transcription of nifA does not require NTRB/NTRC in A. brasilense and the expression of nifHDK is controlled by posttranslational regulation of NIFA activity. Addition of NH4+ or a shift from microaerobic to anaerobic conditions also causes a rapid loss of nitrogenase activity in A. brasilense. This posttranslational regulation of nitrogenase activity involves the DRAT/DRAG regulatory system, which is similar to that of Rhodospirillum rubrum. Both DRAT and DRAG activities are regulated in vivo, but the mechanisms for their regulation are unknown.

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Zhang, Y., Burris, R. H., Ludden, P. W., & Roberts, G. P. (1997, July 15). Regulation of nitrogen fixation in Azospirillum brasilense. FEMS Microbiology Letters. https://doi.org/10.1016/S0378-1097(97)00187-0

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