Cell-to-cell signaling in the symbiotic nitrogen-fixing bacterium Rhizobium leguminosarum: autoinduction of a stationary phase and rhizosphere-expressed genes

The Sym plasmid pRL1JI encodes functions for the formation of nitrogen-fixing pea root nodules by Rhizobium leguminosarum. Some of the nodulation genes are involved in recognition of chemical signals produced by the plant root, and others are required for production of chemical signals recognized by...

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Bibliographic Details
Published in:	Journal of Bacteriology Vol. 178; no. 2; pp. 372 - 376
Main Authors:	Gray, K.M. (University of South Florida, Tampa, FL.), Pearson, J.P, Downie, J.A, Boboye, B.A, Greenberg, E.P
Format:	Journal Article
Language:	English
Published:	United States American Society for Microbiology 01-01-1996
Subjects:	4-Butyrolactone - analogs & derivatives 4-Butyrolactone - chemistry 4-Butyrolactone - isolation & purification ADN ADN RECOMBINADO ADN RECOMBINE Bacteria Bacterial Proteins - genetics Bacterial Proteins - physiology BACTERIOCINAS BACTERIOCINE Bacteriology BETA GALACTOSIDASA BETA GALACTOSIDASE beta-Galactosidase - biosynthesis beta-Galactosidase - genetics DNA-Binding Proteins EXPRESION GENICA EXPRESSION DES GENES GENE Gene Expression Regulation, Bacterial - physiology GENES GENETICA GENETIQUE LACTONAS LACTONE Operon - genetics Peas Plasmids - physiology PROTEINAS AGLUTINANTES PROTEINE DE LIAISON Recombinant Fusion Proteins - biosynthesis RHIZOBIUM LEGUMINOSARUM Rhizobium leguminosarum - chemistry Rhizobium leguminosarum - genetics Rhizobium leguminosarum - growth & development Trans-Activators - chemistry Trans-Activators - isolation & purification
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Summary:	The Sym plasmid pRL1JI encodes functions for the formation of nitrogen-fixing pea root nodules by Rhizobium leguminosarum. Some of the nodulation genes are involved in recognition of chemical signals produced by the plant root, and others are required for production of chemical signals recognized by the plant. pRL1JI also contains a regulatory gene, rhiR, that is homologous to luxR, the transcriptional activator of luminescence genes in Vibrio fischeri. LuxR requires a signal compound, an autoinducer, for its activity. We have identified an R. leguminosarum autoinducer that, together with RhiR, is required to activate both the rhizosphere-expressed rhiABC operon and a growth-inhibiting function encoded by pRL1JI. This intercellular signal is an N-acylated homoserine lactone structurally related to the V. fischeri and other autoinducers. These findings indicate a new level of intercellular communication in root nodule formation
Bibliography:	F61 P34 9606972 ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2
ISSN:	0021-9193 1098-5530 1067-8832
DOI:	10.1128/jb.178.2.372-376.1996