Analysis of the boundaries of Salmonella pathogenicity island 2 and the corresponding chromosomal region of Escherichia coli K-12

The structure of the boundaries of the Salmonella pathogenicity island two (SPI2) was analyzed to determine their relation to the corresponding region of the Escherichia coli K-12 genome. SPI2 was located near the transfer RNA VAL gene of Escherichia coli chromosome which contained a nine kb DNA at the insertion site of SPI2. Analysis of Salmonella isolates also indicated the presence of SPI2 in all strains except Salmonella bongori.