1887

Abstract

RecG is a helicase that is conserved in nearly all bacterial species. The prototypical RecG promotes regression of stalled replication forks, participates in DNA recombination and DNA repair, and prevents aberrant replication. RecG (RecG) is a DNA-dependent ATPase that unwinds a variety of DNA substrates, although its preferred substrate is a Holliday junction. Here, we performed site-directed mutagenesis of selected residues in the wedge domain and motifs Q, I, Ib and VI of RecG. Three of the 10 substitution mutations engineered were detected previously as naturally occurring SNPs in the gene encoding RecG. Alanine substitution mutations at residues Q292, F286, K321 and R627 abolished the RecG unwinding activity, whilst RecG F99A, P285S and T408A mutants exhibited ~25–50 % lower unwinding activity than WT. We also found that RecG bound ATP in the absence of a DNA cofactor.

Funding
This study was supported by the:
  • EU Sixth Framework Project TBadapt (Award 03791)
  • Research Council of Norway (Award FRIBIO 204747)
  • Research Council of Norway Center of Excellence (Award SFF 145977)
  • Leiv Eiriksson Mobility Program Research Council of Norway (Award IS-BILAT-192662)
  • Norwegian State Educational Loan Fund
  • Research Council of Norway (Award FRIMEDBIO 204747)
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2014-01-01
2024-04-19
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