The Base Pair Directory
| CC base pairs with two standard hydrogen bonds |
| base | potential H-bond donor/acceptor sites |
cytosine C  |
C(aa3) N3... C2 O2... |
C(da3) N4-H... C4 N3... |
| CC base pairs with 4 heavy-atom H-bond donor/acceptor sites |
| base pair H-bond motif | structure images |
C(da3/aa3)...C(aa3/da3)
CC carbonyl-amino, symmetric O2...H-N4 C2 C4 N3 N3 C4 C2 N4-H...O2
|
 |
C(da3)...C(da3)
CC N3-amino symmetric N3...H-N4 C4 C4 N4-H...N3 |
 |
| CC base pairs with 3 heavy-atom H-bond donor/acceptor sites |
| base pair H-bond motif | structure images |
C(N4-H1/H2)...C(aa3), N3-trans
CC amino-O2, amino-N3, N3-trans O2...H C2 N4 N3...H
|
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C(N4-H1/H2)...C(aa3), N3-cis
CC amino-O2, amino-N3, N3-cis O2...H C2 N4 N3...H
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