Figure 1.
Figure 1. Hoogsteen pairing of dA
with T or C. (a) Chemical structures of A and dA.
(b) Hoogsteen base pair of syn-A in syn with anti-T or anti-C.
Jagged line represents steric clash between the N6 group of A
and the N4 of C. (c) Hoogsteen base pair of dA
with T or C. Dotted lines represent hydrogen bonds and R denotes
the sugar moiety.
The above figure is reprinted
by permission from Macmillan Publishers Ltd:
Nat Struct Mol Biol
(2006,
13,
619-625)
copyright 2006.
dA
with T or C. (a) Chemical structures of A and 
dA.
(b) Hoogsteen base pair of syn-A in syn with anti-T or anti-C.
Jagged line represents steric clash between the N6 group of A
and the N4 of C. (c) Hoogsteen base pair of