Figure 6.

Representative conformations for the range of structures obtained by molecular modeling of both abasic site anomers. Possible hydrogen bonding is denoted by blue lines with putative hydrogen bonding distances given in Å. The abasic site O1′ (ball) and O4′ (stick) are shown in red, the H1′ and O1′H in white. (A) Two representative conformations of the α anomer (green, 8/10 solutions; blue, 2/10 solutions); (B) three representative conformations of the β anomer (5/20 solutions in yellow; 14/20 solutions in blue; 1/20 solutions in green).