Basepairs involving WatsonCrick(W) 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 N-H...N/O type hydrogen bonds only

Basepair

(type & Orientation)

*Frequency

Example

Hydrogen bonding atoms with their precursors

U:U W:S Cis

0

Optimized Model Structure

C6-N3...O2-C5

N1-O2...O2'-C6

U:U W:S Trans

0

Optimized Model Structure

C6-N3...O2-C5

C5-O4...O2'-C6

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