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Título del libro: How Transcriptomics Revealed New Information On Actinorhizal Symbioses Establishment And Evolution
Título del capítulo: FNR-Like Proteins in Rhizobia: Past and Future

Autores UNAM:
MARIA DE LOURDES GIRARD CUESY;
Autores externos:

Idioma:
Inglés
Año de publicación:
2015
Palabras clave:

Functional and expression analysis; Oxygen regulation; Symbiotic nitrogen fixation


Resumen:

Rhizobium etli is a Gram-negative soil bacteria that are able to establish a symbiotic association with the common bean plant Phaseolus vulgaris, leading to the formation of N2-fixing root nodules. A key checkpoint of this energetic-expensive process is the drop in oxygen concentration. In R. etli, the regulatory network that responds to low oxygen is somewhat different from the circuit described in Sinorhizobium meliloti and Bradyrhizobium japonicum. Expression of the fix genes including the symbiotic cytochrome oxidase (cbb3) is regulated by a phosphorelay system composed of at least two proteins, a hybrid FixL-related histidine kinase and FxkR a response regulator that belongs to the OmpR/PhoB superfamily. Downstream of this, two-component system are five regulators from the FNR/CRP superfamily: FixKf, FnrNch, FnrNd, StoRd, StoRf, and NnrR. In this chapter, we aim to discuss relevant aspects on the role of FNR-like regulators within an intricate regulatory network that controls nitrogen fixation in R. etli. © 2015 by John Wiley & Sons, Inc. All rights reserved.


Entidades citadas de la UNAM: