Artículo
The PmrA/PmrB and RcsC/YojN/RcsB systems control expression of the Salmonella O-antigen chain length determinant
Fecha de publicación:
04/2006
Editorial:
Wiley Blackwell Publishing, Inc
Revista:
Molecular Microbiology
ISSN:
0950-382X
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The lipopolysaccharide (LPS) is the outermost component of the cell envelope in Gram-negative bacteria. It consists of the hydrophobic lipid A, a short non-repeating core oligosaccharide and a distal polysaccharide termed O-antigen. We report here that the PmrA/PmrB and RcsC/YojN/RcsB two-component systems of Salmonella enterica serovar Typhimurium independently promote transcription of the wzzst gene, which encodes a protein that determines the chain length of the O-antigen. We show that the regulatory proteins PmrA and RcsB footprint partially overlapping regions of the wzz st promoter stimulating transcription from the same start site. Induction of the PmrA/PmrB or RcsC/YojN/RcsB systems increased the fraction of LPS molecules containing 16-35 O-antigen subunits, leading to heightened resistance to serum. The LPS of a rcsB null mutant exhibited an altered mobility in the O-antigen subunits attached to the lipid A-core region when separated on a SDS/PAGE gel, suggesting that RcsB may regulate additional LPS genes. Inactivation of the wzzst gene eliminated the enhanced swarming behaviour exhibited by the rcsB mutant. That multiple regulatory systems control wzzst expression suggests that the Wzzst protein is required under different environmental conditions.
Palabras clave:
Two Component System
,
Virulence
,
O-Antigen
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Articulos(INSIBIO)
Articulos de INST.SUP.DE INVEST.BIOLOGICAS
Articulos de INST.SUP.DE INVEST.BIOLOGICAS
Citación
Delgado, Monica Alejandra; Mouslim, Chakib; Groisman, Eduardo A.; The PmrA/PmrB and RcsC/YojN/RcsB systems control expression of the Salmonella O-antigen chain length determinant; Wiley Blackwell Publishing, Inc; Molecular Microbiology; 60; 1; 4-2006; 39-50
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