NDLI: Hydrogenase genes from Rhizobium leguminosarum bv. viciae are controlled by the nitrogen fixation regulatory protein NifA

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Hydrogenase genes from Rhizobium leguminosarum bv. viciae are controlled by the nitrogen fixation regulatory protein NifA

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Hydrogenase genes from Rhizobium leguminosarum bv. viciae are controlled by the nitrogen fixation regulatory protein NifA

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Cabrera, E. Palacios, J. M. Ruiz-argüeso, T. Fernández, D. Martínez, M. Imperial, J. Rey, L. Brito, B.
Description	Author Affiliation: Brito B ( Laboratorio de Microbiología, Escuela Técnica Superior Ingenieros Agrónomos, Universidad Politécnica de Madrid, Spain.);
Abstract	Rhizobium leguminosarum bv. viciae expresses an uptake hydrogenase in symbiosis with peas (Pisum sativum) but, unlike all other characterized hydrogen-oxidizing bacteria, cannot express it in free-living conditions. The hydrogenase-specific transcriptional activator gene hoxA described in other species was shown to have been inactivated in R. leguminosarum by accumulation of frameshift and deletion mutations. Symbiotic transcription of hydrogenase structural genes hupSL originates from a -24/-12 type promoter (hupSp). A regulatory region located in the -173 to -88 region was essential for promoter activity in R. leguminosarum. Activation of hupSp was observed in Klebsiella pneumoniae and Escherichia coli cells expressing the K. pneumoniae nitrogen fixation regulator NifA, and in E. coli cells expressing R. meliloti NifA. This activation required direct interaction of NifA with the essential -173 to -88 regulatory region. However, no sequences resembling known NifA-binding sites were found in or around this region. NifA-dependent activation was also observed in R. etli bean bacteroids. NifA-dependent hupSp activity in heterologous hosts was also absolutely dependent on the RpoN sigma-factor and on integration host factor. Proteins immunologically related to integration host factor were identified in R. leguminosarum. The data suggest that hupSp is structurally and functionally similar to nitrogen fixation promoters. The requirement to coordinate nitrogenase-dependent H2 production and H2 oxidation in nodules might be the reason for the loss of HoxA in R. leguminosarum and the concomitant NifA control of hup gene expression. This evolutionary acquired control would ensure regulated synthesis of uptake hydrogenase in the most common H2-rich environment for rhizobia, the legume nodule.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	12
Volume Number	94
Language	English
Publisher	National Academy of Sciences
Publisher Date	1997-07-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Bacterial Proteins Metabolism Gene Expression Regulation, Bacterial Hydrogenase Biosynthesis Promoter Regions, Genetic Regulatory Sequences, Nucleic Acid Rhizobium Leguminosarum Enzymology Genetics Transcription Factors Fabaceae Microbiology Gene Expression Regulation, Enzymologic Klebsiella Pneumoniae Molecular Sequence Data Nitrogen Fixation Peas Plants, Medicinal Recombinant Fusion Proteins Sequence Deletion Sinorhizobium Meliloti Transcription, Genetic Research Support, Non-U.S. Gov't Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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