Structures of DNA polymerase beta with active-site mismatches suggest a transient abasic site intermediate during misincorporation.
Batra, V.K., Beard, W.A., Shock, D.D., Pedersen, L.C., Wilson, S.H.(2008) Mol Cell 30: 315-324
- PubMed: 18471977 
- DOI: 10.1016/j.molcel.2008.02.025
- Primary Citation of Related Structures:  
3C2K, 3C2L, 3C2M - PubMed Abstract: 
We report the crystallographic structures of DNA polymerase beta with dG-dAMPCPP and dC-dAMPCPP mismatches in the active site. These premutagenic structures were obtained with a nonhydrolyzable incoming nucleotide analog, dAMPCPP, and Mn(2+). Substituting Mn(2+) for Mg(2+) significantly decreases the fidelity of DNA synthesis ...