title: A carboxy-terminal domain of Tir from enterohemorrhagic Escherichia coli O157:H7 (EHEC O157:H7) required for efficient type III secretion.
abstract: 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.
authors.affiliation: Department of Microbiology and Infectious Diseases, University of Calgary Health Sciences Centre, 3330 Hospital Dr. NW, Calgary, AB, Canada T2N 4N1.
authors.forename: Emma
authors.initials: E
authors.lastname: Allen-Vercoe
authors.forename: Michael C W
authors.initials: MC
authors.lastname: Toh
authors.forename: Barbara
authors.initials: B
authors.lastname: Waddell
authors.forename: Harmony
authors.initials: H
authors.lastname: Ho
authors.forename: Rebekah
authors.initials: R
authors.lastname: DeVinney
mesh_terms: D000595:Amino Acid Sequence; D019453:Escherichia coli O157 / Q000472:pathogenicity / Q000502:physiology*; D029968:Escherichia coli Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D015964:Gene Expression Regulation, Bacterial; D006367:HeLa Cells; D006801:Humans; D008969:Molecular Sequence Data; D009154:Mutation; D021381:Protein Transport; D011956:Receptors, Cell Surface / Q000737:chemistry* / Q000235:genetics
chemical_list: D029968:Escherichia coli Proteins; D011956:Receptors, Cell Surface; C109287:Tir protein, E coli