Basepairs involving Sugar(S) edge of Adenine and Sugar(S) edge of Cytosine is shown. Highlighted examples are found from RNA crystal structures obtained from PDB.

Base pairs stabilized by C-H...N/O interactions along with N-H...N/O hydrogen bonds


(type & Orientation)



Hydrogen bonding atoms with their precursors

A:C s:s Cis


Residue Nos. 1353(A)-693(A) PDB ID 2J01

C5-C2 ... O2-C5

C4-N3 ... O2'-C6

* 1st and 2nd numbers in Frequency column represent the numbers of occurences as base pairs and as base triplets, respectively.