Novel reiterated Fnr-type proteins control the production of the symbiotic terminal oxidase cbb3 in Rhizobium etli CFN42.

Novel reiterated Fnr-type proteins control the production of the symbiotic terminal oxidase cbb3 in Rhizobium etli CFN42. Research Abstract Details 

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Novel reiterated Fnr-type proteins control the production of the symbiotic terminal oxidase cbb3 in Rhizobium etli CFN42. Abstract Text:

Manuel J Granados-Baeza, ,Yolanda Mora, Delgado,David Romero,Lourdes Girard,Manuel J Granados-Baeza, ,Yolanda Mora, Delgado,David Romero,Lourdes Girard,Manuel J Granados-Baeza, ,Yolanda Mora, Delgado,David Romero,Lourdes Girard,

Symbiotic nitrogen-fixing bacteria express a terminal oxidase with a high oxygen affinity, the cbb3-type oxidase encoded by the fixNOQP operon. Previously, we have shown that, in Rhizobium etli CFN42, the repeatedfixNOQP operons (fixNOQPd and fixNOQPf) have a differential role in nitrogen fixation. Only the fixNOQPd operon is required for the establishment of an effective symbiosis; microaerobic induction of this operon is under the control of at least three transcriptional regulators, FixKf, FnrNd, and FnrNchr, belonging to the Crp/Fnr family. In this work, we describe two novel Crp/Fnr-type transcriptional regulators (StoRd and StoRf, symbiotic terminal oxidase regulators) that play differential roles in the control of key genes for nitrogen fixation. Mutations either in stoRd or stoRf enhance the microaerobic expression of both fixNOQP reiterations, increasing also the synthesis of the cbb3-type oxidase in nodules. Despite their structural similarity, a differential role of these genes was also revealed, since a mutation in stoRd but not in stoRf enhanced both the expression of fixKf and the nitrogen-fixing capacity of R. etli CFN42.

Novel reiterated Fnr-type proteins control the production of the symbiotic terminal oxidase cbb3 in Rhizobium etli CFN42. Publishing Authors By Initials

MJ Granados-Baeza,N ,Y Mora,MJ Delgado,D Romero,L Girard,MJ Granados-Baeza,N ,Y Mora,MJ Delgado,D Romero,L Girard,MJ Granados-Baeza,N ,Y Mora,MJ Delgado,D Romero,L Girard,

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Novel reiterated Fnr-type proteins control the production of the symbiotic terminal oxidase cbb3 in Rhizobium etli CFN42. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Molecular plant-microbe interactions : MPMI

VOLUME: 20

Page Numbers: 1241-9

Journal Abbreviation: Mol. Plant Microbe Interact.

ISSN: 0894-0282

DAY: 8

MONTH: Oct

YEAR: 2007

Novel reiterated Fnr-type proteins control the production of the symbiotic terminal oxidase cbb3 in Rhizobium etli CFN42. Information

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LANGUAGE: eng

NlmUniqueID: 9107902

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AFFILIATION: Programa de Genómica Funcional de Procariotes, Centro de Ciencias Genómicas, Universidad Nacional Autónoma de México, Ap. Postal 565-A, Cuernavaca, Morelos, 62271, México ;

Country: United States

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MEDLINETA: Mol Plant Microbe Interact

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