UvrD helicase unwinds DNA one base pair at a time by a two-part power stroke.
Lee, J.Y., Yang, W.(2006) Cell 127: 1349-1360
- PubMed: 17190599 
- DOI: 10.1016/j.cell.2006.10.049
- Primary Citation of Related Structures:  
2IS1, 2IS2, 2IS4, 2IS6 - PubMed Abstract: 
Helicases use the energy derived from nucleoside triphosphate hydrolysis to unwind double helices in essentially every metabolic pathway involving nucleic acids. Earlier crystal structures have suggested that DNA helicases translocate along a single-stranded DNA in an inchworm fashion ...