Biopolymers and cell. 2007; 23 (4): 363 - 367

Which intramolecular hygrogen bonds stabilize conformers of deoxyadenosine? The results of quantum-chemical analysis of electron density topology

R. O. Zhurakivsky, D. M. Hovorun

As many as 18 types of intramolecular hydrogen bonds are determined over 88 conformers of 2’-deoxyadenosine nucleoside by means of quantum-chemical analysis (at DFT B3LYP/6-31G(d, p) theory level) of electron density topology with Bader’s Atoms-in-Molecules theory. The total number of H-bonds is 129 and their types are C2’H2...O5’ (11 H-bonds), C2’H2…N3 (32), C2’H1…N3 (1), C3’H…N3 (16), C5’H1…N3 (12), C5’H1…C8 (1), C5’H2…C8 (1), C5’H2…N3 (11), C8H…O5’ (19), C3’H...HC8 (3), C8H…HC3’ (2), C8H…H1C5’ (2), C8H…H2C5’ (1), O5’H...HC8 (2), O3’H...O5’ (4), O5’H...O3’ (4), O5’H…N3 (6), and O5’H…N9 (1). Conformational, geometric, and electron-topological properties of H-bonds are presented.

Key words: deoxyadenosine, stable conformers, intramolecular hydrogen bonds, analysis of electron density topology.