Mechanism of bacteriophage SfII-mediated serotype conversion in Shigella flexneri

Molecular Microbiology
Maria MavrisR Morona

Abstract

We have isolated the lysogenic bacteriophage SfII, which mediates glucosylation of Shigella flexneri O-antigen, resulting in expression of the type II antigen. SfII belongs to group A of the Bradley classification and has a genome size of 42.3kb. DNA sequencing of a 4 kb BamHI subclone identified four open reading frames (ORFs), of which only two were found to be necessary for serotype conversion. These genes were named bgt, which encodes a putative bactoprenol glucosyl transferase, and gtrII, encoding the putative type II antigen determining glucosyl transferase. These genes are adjacent to the integrase gene (int) and attachment site (attP), which are highly homologous to those of Salmonella bacteriophage P22. Another ORF encoded a highly hydrophobic protein of 120 amino acids with homologues in Escherichia coli, Salmonella bacteriophage P22 and S. flexneri. Previous studies identified gtrX, the glucosyl transferase gene, of bacteriophage SfX, which also glucosylates the O-antigen specifically. We determined that gtrX-mediated expression of the group 7,8 antigen also requires bgt. This allowed us to identify gtrII as being the serotype antigen II determining glucosyl transferase. Southern hybridization and polymerase chain re...Continue Reading

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