Abstract
The magnetic circular dichroism (MCD) of netropsin and distamycin-A is reported. New data for the interaction with dA · dT base pairs in DNA were obtained from the MCD of their complexes with DNA duplex polymers. The MCD results allow an interpretation of the induced Cotton effects in the natural CD spectra of netropsin and distamycin-A complexes with DNA. While large distortions of the bases in DNA by the oligopeptide interaction is excluded, some subtle conformational variations of the DNA might explain the inhibition of the enzyme function of netropsin and distamycin-A on DNA.
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