Basepairs involving WatsonCrick(W) edge of Guanine and Sugar(S) edge of Cytosine 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

G:C W:S Cis

6

Optimized Model Structure

N3-O2...N1-C5

C6-O2'...N2-N3

G:C W:S Trans

6

Optimized Model Structure

N3-O2...N2-N3

C6-O2'...N1-C5

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