Control of directionality in bacteriophage mv4 site-specific recombination: functional analysis of the Xis factor.

Journal of Bacteriology
M Coddeville, P Ritzenthaler

Abstract

The integrase of the temperate bacteriophage mv4 catalyzes site-specific recombination between the phage attP site and the host attB site during Lactobacillus delbrueckii lysogenization. The mv4 prophage is excised during the induction of lytic growth. Excisive site-specific recombination between the attR and attL sites is also catalyzed by the phage-encoded recombinase, but the directionality of the recombination is determined by a second phage-encoded protein, the recombination directionality factor (RDF). We have identified and functionally characterized the RDF involved in site-specific excision of the prophage genome. The mv4 RDF, (mv4)Xis, is encoded by the second gene of the early lytic operon. It is a basic protein of 56 amino acids. Electrophoretic mobility shift assays demonstrated that (mv4)Xis binds specifically to the attP and attR sites via two DNA-binding sites, introducing a bend into the DNA. In vitro experiments and in vivo recombination assays with plasmids in Escherichia coli and Lactobacillus plantarum demonstrated that (mv4)Xis is absolutely required for inter- or intramolecular recombination between the attR and attL sites. In contrast to the well-known phage site-specific recombination systems, the integ...Continue Reading

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Citations

Jun 30, 2012·Molecular Microbiology·Ignacio Mir-SanchisJosé R Penadés
Apr 27, 2016·Journal of Molecular Biology·Bryce L Lunt, Graham F Hatfull
Nov 22, 2013·Journal of Virology·Michèle CoddevillePaul Ritzenthaler
May 14, 2011·Molecular Microbiology·Thanafez KhaleelMargaret C M Smith

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