Basepairs involving Sugar(S) edge of Adenine and WatsonCrick(W) edge of Adenine is shown. Highlighted examples are found from RNA crystal structures obtained from PDB.

Base pairs stabilized by C-H...N/O interactions along with C-H...N/O interactions

Basepair

(type & Orientation)

*Frequency

Example

Hydrogen bonding atoms with their precursors

A:A s:w Cis

1

Optimized Model Structure

C5-N1...C2-C6

C4-C2...N3-C5

A:A s:w Trans

7

Optimized Model Structure

N7-N6...N3-C5

C4-N1...C2-C6

Base pairs stabilized by N-H...N/O type hydrogen bonds only

Basepair

(type & Orientation)

*Frequency

Example

Hydrogen bonding atoms with their precursors

A:A S:W Cis

86

Residue Nos.89(D)-96(D) PDB ID 1N78

N7-N6 ... N3-C5

C4-N1 ... O2'-C8

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