1887

Abstract

Alternative sigma factor 54 (RpoN) is an important regulator of stress resistance and virulence genes in many bacterial species. In this study, we report on the gene expression alterations that follow inactivation in O157 : H7 strain Sakai (Sakai : : ), and the influence of RpoN on the acid resistance phenotype. Microarray gene expression profiling revealed the differential expression of 103 genes in Sakai : :  relative to Sakai. This included the growth-phase-dependent upregulation of genes required for glutamate-dependent acid resistance (GDAR) (, , and ), and the downregulation of locus of enterocyte effacement (LEE) genes, which encode a type III secretion system. Upregulation of genes in Sakai : :  during exponential growth correlated with increased GDAR and survival in a model stomach system. Complementation of Sakai : :  with a cloned version of restored acid susceptibility. Genes involved in GDAR regulation, including (sigma factor 38) and (acid-responsive regulator), were shown to be required for the survival of Sakai : :  by the GDAR mechanism. This study describes the contribution of to acid resistance and GDAR gene regulation, and reveals RpoN to be an important regulator of stress resistance and virulence genes in O157 : H7.

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2010-03-01
2020-08-06
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