Crystal structure of the phage T4 recombinase UvsX and its functional interaction with the T4 SF2 helicase UvsW.

Published

Journal Article

Bacteriophage T4 provides an important model system for studying the mechanism of homologous recombination. We have determined the crystal structure of the T4 UvsX recombinase, and the overall architecture and fold closely resemble those of RecA, including a highly conserved ATP binding site. Based on this new structure, we reanalyzed electron microscopy reconstructions of UvsX-DNA filaments and docked the UvsX crystal structure into two different filament forms: a compressed filament generated in the presence of ADP and an elongated filament generated in the presence of ATP and aluminum fluoride. In these reconstructions, the ATP binding site sits at the protomer interface, as in the RecA filament crystal structure. However, the environment of the ATP binding site is altered in the two filament reconstructions, suggesting that nucleotide cannot be as easily accommodated at the protomer interface of the compressed filament. Finally, we show that the phage helicase UvsW completes the UvsX-promoted strand-exchange reaction, allowing the generation of a simple nicked circular product rather than complex networks of partially exchanged substrates.

Full Text

Duke Authors

Cited Authors

  • Gajewski, S; Webb, MR; Galkin, V; Egelman, EH; Kreuzer, KN; White, SW

Published Date

  • January 7, 2011

Published In

Volume / Issue

  • 405 / 1

Start / End Page

  • 65 - 76

PubMed ID

  • 21035462

Pubmed Central ID

  • 21035462

Electronic International Standard Serial Number (EISSN)

  • 1089-8638

Digital Object Identifier (DOI)

  • 10.1016/j.jmb.2010.10.004

Language

  • eng

Conference Location

  • England