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- Title
Efficient second strand cleavage during Holliday junction resolution by RuvC requires both increased junction flexibility and an exposed 5' phosphate.
- Authors
Osman, Fekret; Gaskell, Louise; Whitby, Matthew C
- Abstract
Holliday junction (HJ) resolution is a critical step during homologous recombination. In Escherichia coli this job is performed by a member of the RNase H/Integrase superfamily called RuvC, whereas in Schizosaccharomyces pombe it has been attributed to the XPF family member Mus81-Eme1. HJ resolution is achieved through the sequential cleavage of two strands of like polarity at or close to the junction crossover point. RuvC functions as a dimer, whereas Mus81-Eme1 is thought to function as a dimer of heterodimers. However, in both cases the multimer contains two catalytic sites, which act independently and sequentially during the resolution reaction. To ensure that both strands are cleaved before the nuclease dissociates from the junction, the rate of second strand cleavage is greatly enhanced compared to that of the first. The enhancement of second strand cleavage has been attributed to the increased flexibility of the nicked HJ, which would facilitate rapid engagement of the second active site and scissile bond. Here we have investigated whether other properties of the nicked HJ are important for enhancing second strand cleavage.
- Publication
PloS one, 2009, Vol 4, Issue 4, pe5347
- ISSN
1932-6203
- Publication type
Journal Article
- DOI
10.1371/journal.pone.0005347