A Site-specific, Conservative Recombination System Carried by Bacteriophage P1. Mapping the Recombinase Gene Cin and the Cross-over Sites Cix for the Inversion of the C Segment
Overview
Molecular Biology
Authors
Affiliations
The bacteriophage P1 genome carries an invertible C segment consisting of 3-kb unique sequences flanked by 0.6-kb inverted repeats. With insertion and deletion mutants of P1 derivatives the site-specific recombinase gene cin for C inversion) has been mapped adjacent to the C segment and the cix sites (for C inversion cross-over) have been located at the outside ends of the inverted repeats. Inversion of the C segment functions as a biological switch and controls expression of the gene(s) responsible for phage infectivity carried on the C segment. The cin gene product can promote recombination between a 'quasi- cix ' site on plasmid pBR322 and a cix site on P1 DNA. The junctions formed on the resulting co-integrate can also serve as cix sites. This observation implies a potential evolutionary process to bring genes under the control of a biological switch acting by DNA inversion.
Systematic and scalable genome-wide essentiality mapping to identify nonessential genes in phages.
Piya D, Nolan N, Moore M, Ramirez Hernandez L, Cress B, Young R PLoS Biol. 2023; 21(12):e3002416.
PMID: 38048319 PMC: 10695390. DOI: 10.1371/journal.pbio.3002416.
Mazloum A, Karagyaur M, Chernyshev R, Schalkwyk A, Jun M, Qiang F Front Vet Sci. 2023; 10:1180621.
PMID: 37601766 PMC: 10434572. DOI: 10.3389/fvets.2023.1180621.
Phage-Plasmids Spread Antibiotic Resistance Genes through Infection and Lysogenic Conversion.
Pfeifer E, Bonnin R, Rocha E mBio. 2022; 13(5):e0185122.
PMID: 36154183 PMC: 9600943. DOI: 10.1128/mbio.01851-22.
Bacteriophage P1 does not show spatial preference when infecting Escherichia coli.
Zhang K, Young R, Zeng L Virology. 2020; 542:1-7.
PMID: 31957661 PMC: 7024032. DOI: 10.1016/j.virol.2019.12.012.
Diversity of P1 phage-like elements in multidrug resistant Escherichia coli.
Venturini C, Zingali T, Wyrsch E, Bowring B, Iredell J, Partridge S Sci Rep. 2019; 9(1):18861.
PMID: 31827120 PMC: 6906374. DOI: 10.1038/s41598-019-54895-4.