Chapter title |
The Epinephrine/Norepinephrine /Autoinducer-3 Interkingdom Signaling System in Escherichia coli O157:H7.
|
---|---|
Chapter number | 12 |
Book title |
Microbial Endocrinology: Interkingdom Signaling in Infectious Disease and Health
|
Published in |
Advances in experimental medicine and biology, January 2016
|
DOI | 10.1007/978-3-319-20215-0_12 |
Pubmed ID | |
Book ISBNs |
978-3-31-920214-3, 978-3-31-920215-0
|
Authors |
Moreira, Cristiano G, Sperandio, Vanessa, Moreira, Cristiano G. |
Abstract |
Epinephrine/norepinephrine/AI-3 signaling is used as an interkingdom chemical signaling system between microbes and their hosts. This system is also exploited by pathogens to regulate virulence traits. In enterohemorrhagic E. coli (EHEC) O157:H7, it is essential for pathogenesis and flagella motility. These three signals activate expression of a pathogenicity island named locus of enterocyte effacement (LEE), Shiga toxin, and the flagella regulon. These signals are sensed by the two-component system QseBC, whereas the bacterial membrane receptor QseC autophosphorylates and phosphorylates the QseB response regulator initiating a complex phosphorelay signaling cascade that activates the expression of a second two-component system, QseEF. The QseEF two-component system is also involved in the expression of the virulence genes, and it senses epinephrine, phosphate, and sulfate. This complex signaling cascade still needs to be completely elucidated. |
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