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- W2004398753 abstract "ABSTRACT Salmonella enterica serovar Enteritidis is a major cause of food-borne diseases associated with consumption of shell eggs. Clinical isolates of S. enterica serovar Enteritidis exhibit a wide spectrum of virulence in mice. A highly virulent isolate (SE2472) was previously shown to be more resistant in vitro than other clinical isolates to acidified sodium nitrite (ASN), a generator of reactive nitrogen and oxygen intermediates (RNI/ROI). SE2472 is also more resistant to S -nitrosoglutathione (GSNO) and hydrogen peroxide (H 2 O 2 ) than an ASN-susceptible isolate of S. enterica serovar Enteritidis (SE8743). To investigate the molecular basis for the RNI/ROI resistance of S. enterica serovar Enteritidis, we transformed a genomic DNA library of SE2472 into SE8743. A plasmid clone conferred upon SE8743 enhanced resistance to ASN, GSNO, and H 2 O 2 . The DNA insert in the clone encoded ArcA, a global regulator. An arcA mutant of SE2472 was constructed and was found to be more susceptible to GSNO and hydrogen peroxide but not more susceptible to ASN than wild-type SE2472. The susceptibility of the arcA mutant to GSNO and H 2 O 2 was complemented by a plasmid harboring arcA . The coding sequence of the arcA gene in SE2472 and the coding sequence of the arcA gene in SE8743 were identical, suggesting that the difference in resistance to RNI/ROI maybe due to the activity of genes regulated by ArcA. No significant difference in virulence between the wild type and the arcA mutant of SE2472 was observed in mice. These observations show that arcA is essential for resistance of S. enterica serovar Enteritidis to nitrosative and oxidative stress. However, additional genetic loci may contribute to the resistance to RNI/ROI and unusually high virulence for mice of SE2472." @default.
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- W2004398753 date "2002-02-01" @default.
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- W2004398753 title "The Global Regulator ArcA Controls Resistance to Reactive Nitrogen and Oxygen Intermediates in <i>Salmonella enterica</i> Serovar Enteritidis" @default.
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- W2004398753 doi "https://doi.org/10.1128/iai.70.2.451-461.2002" @default.
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