Interaction energy studies on antibiotics nucleoside analogs 2-azaadenine

The 2-azaadenine antibiotic is known to be a potent cytotoxic nucleoside analog. Evaluation of the interaction energy of this molecule with nucleic acid bases and base pairs has been performed using a quantum-mechanical perturbation technique. Both in-plane and stacking energies have been computed. These energy values along with their sites of association have been compared with the standard energy values and spatial positions for the nucleic acid bases during transcription. The results have been examined in the light of their biological significance.

Biological activity of 3-deazauridine nucleoside analogue: a theoretical study

The incorporation model of Sanyal et al. has been used to understand the biological activity of the cytostatic compound 3-deazauridine. The interaction energies of various types of binding pattern of the enterant molecule with nucleic acid fragments have been computed. The energy values and the sites of association of the analogous base, obtained by optimization of energy values as well as the sites of association of nucleic acid bases during the transcription process have been compared. The specificity of the binding of the interacting molecule has been discussed, along with the inhibitory effect of 3-deazauridine. They are in agreement with the experimentally observed evidence.