Basepairs involving Hoogsteen(H) edge of Uracil and Sugar(S) 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

U:U h:s Trans

0

Optimized Model Structure

C2-C5...O2-C5

N3-O4...O2'-C6

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