Electrostatic potentials of deoxydinucleoside monophosphates. 1. Deoxydinucleoside monophosphates and actinomycin chromophore interactions.

We present electrostatic potential maps for the ten Watson-Crick base-pair combinations of dinucleoside monophosphates in a conformation appropriate for intercalation of drugs to occur. These maps reveal interesting differences among the base-pair combinations and suggest reasons for the base-pair specificities often observed upon intercalation. Simple electrostatic calculations on the intercalation energy of substituted actinomycin chromophores correlate qualitatively with the relative biological activity of these compounds, although the correlation with binding affinity is not as satisfactory.