[Interactinos of DNA with low molecular weight ligands of various structures. I. Complexes of DNA with actinomycin and its simple analogs].

The DNA complexes with actinomycin D and its simple analogues have been investigated by means of spectrophotometry, viscometry and flow birefringence methods. The number of binding sites per base pair of ligand on DNA depends on the nature of substitute in 1.9 position of the phenoxasone chromophore.