Quorum sensing Escherichia coli regulators B and C (QseBC): a novel two-component regulatory system involved in the regulation of flagella and motility by quorum sensing in E. coli

Molecular Microbiology
Vanessa SperandioJames B Kaper

Abstract

Quorum sensing is a cell-to-cell signalling mechanism in which bacteria secrete hormone-like compounds called autoinducers. When these auto-inducers reach a certain threshold concentration, they interact with bacterial transcriptional regulators, thereby regulating gene expression. Enterohaemorrhagic Escherichia coli (EHEC) O157:H7 as well as E. coli K-12 produces the autoinducer-2 (AI-2), which is synthesized by the product of the luxS gene, and previous work from our laboratory has shown that genes encoding the EHEC type III secretion system were activated by quorum sensing. Recently, by hybridizing an E. coli K-12 gene array with cDNA synthesized from RNA extracted from EHEC strain 86-24 and its isogenic luxS mutant, we observed that other potential virulence-associated factors, such as genes encoding the expression and assembly of flagella, motility and chemotaxis, were also activated by quorum sensing. The array data also indicated that several genes encoding putative E. coli regulators were controlled by quorum sensing. In this report, we describe a two-component system regulated by quorum sensing that shares homology with Salmonella typhimurium PmrAB, which we have named quorum sensing E. coli regulator B and C (QseBC). ...Continue Reading

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