Basepairs involving WatsonCrick(W) edge of Guanine and Hoogsteen(H) edge of Uracil 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

Basepair

(type & Orientation)

*Frequency

Example

Hydrogen bonding atoms with their precursors

G:U w:h Trans

8

Optimized Model Structure

C4-N1...O4-N3

N7-O6...C5-N1

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