Basepairs involving WatsonCrick edge of Adenine and WatsonCrick edge of Cytosine

Basepairs involving WatsonCrick(W) 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 W:W Trans	10	Residue Nos. 1742(0)-2037(0) PDB ID 3CME	N9-N1...N4-C5 N7-N6...N3-C6
A:C +:W Cis	30	Residue Nos. 2063-2450 PDB ID 2QAO	N9-N1...O2-C1' N7-N6...N3-C6
A:C W:+ Trans	0	Optimized Model Structure	C5-N3...N1-C4 N1-O2...N6-N7

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 w:w Cis	14	Residue Nos. 244(B)-226(B) PDB ID 3DS7	C5-N1...N4-C5 C8-C2...N3-C6

Basepair

(type & Orientation)

*Frequency

Example

Hydrogen bonding atoms with their precursors

A:C w:w Cis

Residue Nos. 244(B)-226(B) PDB ID 3DS7

C5-N1...N4-C5

C8-C2...N3-C6