Structural basis for DNA duplex separation by a superfamily-2 helicase.
Buttner, K., Nehring, S., Hopfner, K.P.(2007) Nat Struct Mol Biol 14: 647-652
- PubMed: 17558417 
- DOI: 10.1038/nsmb1246
- Primary Citation of Related Structures:  
2P6R, 2P6U - PubMed Abstract: 
To reveal the mechanism of processive strand separation by superfamily-2 (SF2) 3'-->5' helicases, we determined apo and DNA-bound crystal structures of archaeal Hel308, a helicase that unwinds lagging strands and is related to human DNA polymerase theta. Our structure captures the duplex-unwinding reaction, shows that initial strand separation does not require ATP and identifies a prominent beta-hairpin loop as the unwinding element ...