Basepairs involving Sugar(S) edge of Adenine and Sugar(S) edge of Adenine 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 interactions

Basepair

(type & Orientation)

*Frequency

Example

Hydrogen bonding atoms with their precursors

A:A s:s Cis

18/
4

Residue Nos. 980(B)-2037(B) PDB ID 2QAO

C6-N3....C2-C5

C8-O2'...N3-N7

A:A s:s Trans

6

Optimized Model Structure

C5-N3 ...C2-C6

C6-C2 ...N3-C5

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