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- W2079368671 abstract "We reported earlier that the production of O antigen lipopolysaccharide (LPS) by Salmonella enterica serovar Typhi (Salmonella typhi) increases at the onset of stationary phase and correlates with a growth-regulated expression of the rfaH gene under the control of the alternative sigma factor RpoN (Microbiology 148 (2002) 3789). In this study, we demonstrate that RpoS also modulates rfaH promoter activity as revealed by the absence of growth-dependent regulation of an rfaH–lacZ transcriptional fusion and O antigen production in a S. typhi rpoS mutant. Introduction of a constitutively expressed rpoN gene into the rpoS mutant restored increased production of O antigen during stationary phase, suggesting that constitutive production of RpoN could overcome the RpoS defect. Similar results were observed when an rpoS rpoN double mutant was transformed with the intact rpoN gene. Thus, we conclude that both RpoS and RpoN control the rfaH promoter activity and concomitantly, the production of O-specific LPS in S. typhi." @default.
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- W2079368671 date "2004-01-01" @default.
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- W2079368671 title "RpoS and RpoN are involved in the growth-dependent regulation of rfaH transcription and O antigen expression in Salmonella enterica serovar typhi" @default.
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- W2079368671 doi "https://doi.org/10.1016/j.micpath.2003.08.003" @default.
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