FIG. 4.
DNA surrounding gnd alleles of E. coli O55:H7 and E. coli O157:H7. DNA surrounding the O55:H7 and O157:H7 gnd alleles is depicted. Vertical numbers preceded by + represent distances in nucleotides from the 3′ end of gnd. Region I is 96% identical between the two strains. Region II includes segments homologous to tnpA of S. enterica serovar Typhimurium, an Rhs-like element including an H-rpt gene and flanking 11-mer inverted repeats, noncoding O157 rfb sequences, and O111 wbdJ and wbdK. Homologous proteins are noted directly above corresponding ORFs; the H-rpt corresponds to the ORF designated hrhEcO55:H7. Arrows represent the lateral borders of the 2.0- and 2.8-kb EcoRV fragments conserved among all E. coli O55 strains tested, as demonstrated in Fig. 6A. Asterisks represent locations of the 11-mer inverted repeats at the periphery of the Rhs-like element.