Y E. coli MS455, further studies will be required to investigate the function of this protein in wild-type strains.DISCUSSIONAutotransporters are a diverse family of outer membrane proteins that have various virulence-associated functions, including in biofilm formation and adherence to mammalian cells. Our previous study of four AT proteins identified in E. coli O157:H7 strain EDL933, termed EhaA