Transcription regulation of the expression of the plasmid encoded toxin of enteroaggregative escherichia coli

[摘要] The pathogenic properties of Enteroaggregative Escherichia coli strain 042 results from the synchronised expression of virulence factors, which include the Plasmid Encoded Toxin. Pet is a member of the serine protease autotransporter of the Enterobacteriaceae family and contributes to infection by cleaving α-fodrin, disrupting the actin cytoskeleton of host cells. The expression of Pet is induced by global transcription factor CRP with further enhancement by the nucleoid associated protein Fis. This study identifies the residues of RNA polymerase, Fis and CRP required for the induction of transcription, thereby clarifying the mechanism of activation employed by the transcription factors. Fis activates transcription from the Fis binding site via a direct interaction with RNA polymerase, facilitated by protein specific determinants. This interaction is dependent on the position of the Fis binding site on the DNA and it subsequent orientation on the helical face of the DNA. CRP induces transcription from its binding site via direct interactions with RNA polymerase, facilitated by protein specific determinants.

[发布机构] University:University of Birmingham;Department:School of Biosciences

[关键词] Q Science;QH Natural history;QH301 Biology