[No authors listed]
The type III secreted protein Tir from Enterohemorrhagic Escherichia coli (EHEC O157:H7) plays a central role in adherence and pedestal formation during infection. Little is known about how Tir domains outside of the amino-terminus contribute to efficient Tir secretion and translocation. We found a 6 amino acid (519-524) carboxy-terminal region which was required for efficient Tir secretion and translocation. Interestingly, EHEC O157:H7 Tir(Delta)519-524 was efficiently secreted when expressed in the related pathogen enteropathogenic E. coli. These data suggest that this region may play a role in maintaining EHEC O157:H7 Tir in a secretion-competent conformation.
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