Regulation of Free-Living and Symbiotic Nitrogen Fixation in Azorhizobium caulinodans

Kaminski, P.A.; Michel-Reydellet, N.; Desnoues, Nicole; Elmerich, Claudine

doi:10.1007/978-94-011-0379-4_25

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“…Oxygen control of nif A expression is mediated by FixLJ (AZC_4654 and AZC_4655) [ 37 ], and the transcription factor FixK (AZC_4653) [ 38 ]. The nif A gene is further controlled at the transcriptional level by a LysR-type regulator [ 39 ] and at the translational level by the nrf A gene product (AZC_3080) [ 40 ]. FixK also activates transcription of the cyt NOQP operon (AZC_4523-AZC_4526), encoding the high-affinity terminal oxidase cytochrome cbb3 that is induced under microaerobiosis [ 41 , 42 ].…”

Section: Resultsmentioning

confidence: 99%

The genome of the versatile nitrogen fixer Azorhizobium caulinodans ORS571

et al. 2008

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Background: Biological nitrogen fixation is a prokaryotic process that plays an essential role in the global nitrogen cycle. Azorhizobium caulinodans ORS571 has the dual capacity to fix nitrogen both as free-living organism and in a symbiotic interaction with Sesbania rostrata. The host is a fastgrowing, submergence-tolerant tropical legume on which A. caulinodans can efficiently induce nodule formation on the root system and on adventitious rootlets located on the stem.

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