Efficient expression of the α-haemolysin determinant in the uropathogenic Escherichia coli strain 536 requires the leuX-encoded tRNA5Leu View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2002-05

AUTHORS

U. Dobrindt, L. Emödy, I. Gentschev, W. Goebel, J. Hacker

ABSTRACT

The uropathogenic Escherichia coli strain 536 (O6:K15:H31) carries two alpha-haemolysin determinants which are located on different pathogenicity islands (PAI I(536) and PAI II(536)). PAI II(536) is associated with the tRNA gene leuX. The leuX-encoded tRNA(5)(Leu) is required for the efficient expression of the hly determinants in strain 536. HlyA levels were reduced and secretion of the protein was delayed in the leuX-negative mutant strain 536Delta102. The lack of a functional tRNA(5)(Leu) resulted in a decrease in hly transcript levels in comparison to the wild-type strain. Analysis of several genes whose products are involved in the regulation of hly expression revealed that levels of RfaH and Hha, as well as the corresponding rfaH and hha transcripts, were higher in the leuX-negative background, whereas the expression of tolC and hns was not influenced by the leuX genotype. The analysis of hly transcript levels in hha deletion mutants of the E. coli strains 536 and 536Delta102 demonstrated that the increase in hha expression is partially responsible for the reduction in hly transcript levels in the leuX-negative background. These results demonstrate that the tRNA(5)(Leu) affects the expression of the alpha-haemolysin determinant at different levels in a regulatory cascade, and imply that, in addition to Hha, at least one further, as yet unidentified, regulatory factor must be involved in the regulation of hly transcription in the uropathogenic E. coli strain 536. More... »

PAGES

370-379

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00438-002-0668-3

DOI

http://dx.doi.org/10.1007/s00438-002-0668-3

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1035330340

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/12073039


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