STEREOSPECIFIC DNA-BINDING OF LUMINESCENT ATROPISOMERIC VIOLOGENS

Binding to B-DNA of one enantiomer of dq3pp. -a member of a novel family of intercalating luminescent eiologens derived from N,N'-dialkyl-6-(2-pyridyl)phenanthridine, in which dialkyl is (CH2)(2-)(dq2pyp), -CH2)(3)- (dq3pyp), or (-CH3)(2) (Me2pyp)-, is strongly favored compared to its estable atropisomer. Evidence of the stereospecific interaction has been gained by resolution of a rac-dq3pyp mixture upon dialysis in the presence of DNA, monitored by circular dichroism. Molecular modeling suggests that the S enantiomer of both dq3pyp and dq2pyp is the one preferred for the binding. No similar resolution has been achieved with rac-dq2pyp due to the lower barrier to interconversion of its atropisomers, as shown by H-1-NMR. The identical binding energy of the two modeled diastereoisomeric Me2pyp-DNA complexes discard enantiospecific interaction of this drug. Affinity chromatography on DNA-cellulose allows isolation of the pure enantiomers of dq3pyp. (C) 1995 Academic Press, Inc.