Phylogenetic group-associated differences in regulation of the common colonization factor Mat fimbria in Escherichia coli.

Timo A Lehti, Philippe Bauchart, Maini Kukkonen, Ulrich Dobrindt, Timo K Korhonen, Benita Westerlund-Wikström

Division of General Microbiology, Department of Biosciences, FI-00014 University of Helsinki, Helsinki, Finland.

Molecular microbiology 2013 Mar

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Heterogeneity of cell population is a key component behind the evolutionary success of Escherichia coli. The heterogeneity supports species adaptation and mainly results from lateral gene transfer. Adaptation may also involve genomic alterations that affect regulation of conserved genes. Here we analysed regulation of the mat (or ecp) genes that encode a conserved fimbrial adhesin of E. coli. We found that the differential and temperature-sensitive expression control of the mat operon is dependent on mat promoter polymorphism and closely linked to phylogenetic grouping of E. coli. In the mat promoter lineage favouring fimbriae expression, the mat operon-encoded regulator MatA forms a positive feedback loop that overcomes the repression by H-NS and stabilizes the fimbrillin mRNA under low growth temperature, acidic pH or elevated levels of acetate. The study exemplifies phylogenetic group-associated expression of a highly common surface organelle in E. coli. © 2013 Blackwell Publishing Ltd.

Citation

Timo A Lehti, Philippe Bauchart, Maini Kukkonen, Ulrich Dobrindt, Timo K Korhonen, Benita Westerlund-Wikström. Phylogenetic group-associated differences in regulation of the common colonization factor Mat fimbria in Escherichia coli. Molecular microbiology. 2013 Mar;87(6):1200-22