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Poly[d(G-m5C)] was modified by reductively activated mitomycin C, an anti-tumour drug, under buffer conditions which are known to favour either the B or the Z conformations of DNA. C.d. and 31P-n.m.r. were used to characterize the poly[d(G-m5C)]-mitomycin cross-linked complexes, as well as the effects on the equilibrium between the B and Z forms of the polynucleotide. Mitomycin C appears to inhibit the B--&gt;Z transition, even in the presence of 3 mM MgCl2, while the Z-form of poly[d(G-m5C)] does not interact significantly with the drug under bifunctionally activating conditions; thus no reversion from the Z-form to the B-form of the polynucleotide can be observed under the salt conditions which are required for the Z-form to exist.

Mitomycin C binding to poly[d(G-m5C)]