3'-5' DNA helicase that may play a role in the repair of DNA. Exhibits an ATP or dATP-dependent DNA-helicase activity. Cannot use GTP/dGTP, CTP/dCTP or UTP/dUTP as nucleotide cofactors. Catalyzes DNA strand annealing. On nicked Holliday junctions, unwinds the lagging strand. Cannot act on intact Holliday junctions. ATP + H2O = ADP + H(+) + phosphate Expressed in roots, seedlings, young leaves, shoots, shoot apical mersitem, inflorescences, flowers, siliques and seeds. Belongs to the helicase family. RecQ subfamily. Truncated N-terminus. The predicted gene At4g35740 has been split into 2 genes: At4g35733 and At4g35740. The predicted gene At4g35740 has been split into 2 genes: At4g35733 and At4g35740.