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The 5-methyl group of thymidine residues protrudes into the major groove of double helical DNA. The structural influence of this exocyclic substituent has been examined using a PCR-made 160 bp fragment in which thymidine residues were replaced with uridine residues. We show that the dT → dU substitution and the consequent deletion of the methyl group affects the cleavage of DNA by deoxyribonuclease...
Circular DNA molecules can readily be formed from the 169 bp tyrT fragment in the presence of T4 DNA ligase. We have analyzed the formation of DNA circles in the presence of the clinically important antitumour drugs amsacrine, mitoxantrone and daunomycin. All three are intercalating agents but they affect the closure reaction differently: daunomycin and mitoxantrone progressively inhibit the formation...
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