Autotransporters but not pAA are critical for rabbit colonization by Shiga toxin-producing Escherichia coli O104:H4

Diana Munera, Jennifer M. Ritchie, Stavroula K. Hatzios, Rod Bronson, Gang Fang, Eric E. Schadt, Brigid M. Davis and Matthew K. Waldor ()
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Diana Munera: Brigham & Women’s Hospital
Jennifer M. Ritchie: Brigham & Women’s Hospital
Stavroula K. Hatzios: Brigham & Women’s Hospital
Rod Bronson: Harvard Medical School
Gang Fang: Mount Sinai School of Medicine
Eric E. Schadt: Mount Sinai School of Medicine
Brigid M. Davis: Brigham & Women’s Hospital
Matthew K. Waldor: Brigham & Women’s Hospital

Nature Communications, 2014, vol. 5, issue 1, 1-9

Abstract: Abstract The outbreak of diarrhoea and haemolytic uraemic syndrome that occurred in Germany in 2011 was caused by a Shiga toxin-producing enteroaggregative Escherichia coli (EAEC) strain. The strain was classified as EAEC owing to the presence of a plasmid (pAA) that mediates a characteristic pattern of aggregative adherence on cultured cells, the defining feature of EAEC that has classically been associated with virulence. Here we describe an infant rabbit-based model of intestinal colonization and diarrhoea caused by the outbreak strain, which we use to decipher the factors that mediate the pathogen’s virulence. Shiga toxin is the key factor required for diarrhoea. Unexpectedly, we observe that pAA is dispensable for intestinal colonization and development of intestinal pathology. Instead, chromosome-encoded autotransporters are critical for robust colonization and diarrhoeal disease in this model. Our findings suggest that conventional wisdom linking aggregative adherence to EAEC intestinal colonization is false for at least a subset of strains.

Date: 2014
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DOI: 10.1038/ncomms4080

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