MBE Advance Access originally published online on August 29, 2003
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Mol. Biol. Evol. 21(1):1-13. 2004
DOI: 10.1093/molbev/msg223
© 2004 by the Society for Molecular Biology and Evolution. ISSN: 0737-4038
Site-Specific Recombination Links the Evolution of P2-like Coliphages and Pathogenic Enterobacteria
Department of Genetics, University of Stockholm, Stockholm, Sweden
E-mail: anders.nilsson{at}genetics.su.se.
The genome of the tailed temperate coliphage P2 (Myoviridae) contains some genes that probably are horizontally transferred additions to the genome. One of these genes, the Z/fun gene, was recently found intact in the genome of Neisseria meningitidis. We have investigated the presence of P2-like phages, and the genetic variation at the position corresponding to the phage P2 Z/fun locus, in the Escherichia coli reference collection (ECOR). P2-like phages are common in E. coli since they are present in about 30% of the ECOR strains. Hybridizations and PCR amplifications indicate that the overall variation among these phages is small. Amplification of the region corresponding to the phage P2 Z/fun locus in 11 prophages revealed that this is a multivariable locus. Sequencing of the region resulted in 10 completely different sequences but with a similar high AT-content as the Z/fun gene. All sequences contained at least one open reading frame with good transcription and translation signals. All sequences were also surrounded by a highly similar, previously undiscovered, inverted repeat (IR). We also found this IR in genetically unstable regions in pathogenic enterobacteria. This demonstrates that P2-like phages are important factors in the evolution of bacteria, not only because they carry a diversity of lysogenic conversion genes but also because they can act as vectors for single genes. The genes found between the IRs have unknown functions, and only a few clearly similar genes have been found in other bacteria.
Key Words: bacteriophage P2 • enterobacteria • site-specific recombination • lysogenic conversion • virulence factors
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