Basepairs involving Sugar(S) edge of Adenine and WatsonCrick(W) 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

A:C S:W Cis

21/
5

Residue Nos. 3036(9)-3047(9) PDB ID 1VQO

C5-N3...N4-C5

C8-O2'...N3-C6

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

A:C s:w Trans

0

Optimized Model Structure

C5-N3...N4-N3

C6-C2...N3-C6

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