Symbiotic implications of type III protein secretion machinery in Rhizobium

The symbiotic plasmid of Rhizobium sp. NGR234 carries a cluster of genes that encodes components of a bacterial type III secretion system (TTSS). In both animal and plant pathogens, the TTSS is an essential component of pathogenicity. Here, we show that secretion of at least two proteins (y4xL and N...

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Published inMolecular microbiology Vol. 28; no. 6; pp. 1381 - 1389
Main Authors Viprey, Virginie, Del Greco, Aixa, Golinowski, Wladyslaw, Broughton, William J., Perret, Xavier
Format Journal Article
LanguageEnglish
Published Oxford BSL Blackwell Science Ltd 01.06.1998
Blackwell Publishing Ltd
Subjects
Bacterial Proteins - metabolism
Chromosome Mapping
Fabaceae - microbiology
Fabaceae - ultrastructure
Gene Expression Regulation, Bacterial
Genes, Bacterial
Microscopy, Electron
Models, Genetic
Multigene Family
Mutagenesis, Insertional
Plants, Medicinal
Rhizobium - genetics
Rhizobium - metabolism
Rhizobium - pathogenicity
Symbiosis
Transcription, Genetic
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Summary:The symbiotic plasmid of Rhizobium sp. NGR234 carries a cluster of genes that encodes components of a bacterial type III secretion system (TTSS). In both animal and plant pathogens, the TTSS is an essential component of pathogenicity. Here, we show that secretion of at least two proteins (y4xL and NolX) is controlled by the TTSS of NGR234 and occurs after the induction with flavonoids. Polar mutations in two TTSS genes, rhcN and the nod‐box controlled regulator of transcription y4xI, block the secretion of both proteins and strongly affect the ability of NGR234 to nodulate a variety of tropical legumes including Pachyrhizus tuberosus and Tephrosia vogelii.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0950-382X
1365-2958
DOI:10.1046/j.1365-2958.1998.00920.x