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

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

Basepair

(type & Orientation)

*Frequency

Example

Hydrogen bonding atoms with their precursors

A:U s:s Cis

56

Residue Nos. 152(A)-224(A) PDB ID 1GID

C5-C2...O2-C5

N7-N3...O2'-C6

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