Holliday junction binding and resolution by the Rap structure-specific endonuclease of phage lambda

Journal of Molecular Biology
G J SharplesEdward L Bolt

Abstract

Rap endonuclease targets recombinant joint molecules arising from phage lambda Red-mediated genetic exchange. Previous studies revealed that Rap nicks DNA at the branch point of synthetic Holliday junctions and other DNA structures with a branched component. However, on X junctions incorporating a three base-pair core of homology or with a fixed crossover, Rap failed to make the bilateral strand cleavages characteristic of a Holliday junction resolvase. Here, we demonstrate that Rap can mediate symmetrical resolution of 50 bp and chi Holliday structures containing larger homologous cores. On two different mobile 50 bp junctions Rap displays a weak preference for cleaving the phosphodiester backbone between 5'-GC dinucleotides. The products of resolution on both large and small DNA substrates can be sealed by T4 DNA ligase, confirming the formation of nicked duplexes. Rap protein was also assessed for its capacity to influence the global conformation of junctions in the presence or absence of magnesium ions. Unlike the known Holliday junction binding proteins, Rap does not affect the angle of duplex arms, implying an unorthodox mode of junction binding. The results demonstrate that Rap can function as a Holliday junction resolva...Continue Reading

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Citations

Mar 2, 2011·Journal of Molecular Recognition : JMR·Fiona A CurtisGary J Sharples
Feb 22, 2005·Molecular Microbiology·Fiona A CurtisGary J Sharples
Sep 13, 2008·PLoS Genetics·J Kim HollowayPaula E Cohen
Sep 17, 2020·International Journal of Molecular Sciences·Katarzyna BujakMonika Radlinska
Nov 1, 2012·EcoSal Plus·Bénédicte Michel, David Leach
Jun 29, 2011·Virus Research·Ambra Lo PianoSilvia Ayora

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