500 MHz ¹H‐NMR study of the interaction of daunomycin with B and Z helices of d(CGm⁵CGCG)

Abstract

The interaction of daunomycin with B and Z helices of a self-complementary DNA fragment d(CGm5CGCG) in solution was studied by 1H-NMR spectroscopy at 500 MHz. The results show that the B-Z transition kinetics is not affected by addition of daunomycin. Daunomycin binds exclusively to the B form of d(CGm5CGCG). Z exchanges with B while the latter also exchanges with the B duplex-daunomycin complexes.