Depurination from DNA of 7-methylguanine, 7-(2-aminoethyl)-guanine and ring-opened 7-methylguanines.


DNA was reacted with dimethyl sulphate and ethyleneimine to afford respective 7-methylguanine and 7-(2-aminoethyl)guanine derivatives. The substituted DNA was boiled in 0.1 M NaCl containing 10 mM phosphate buffer (pH 7.0), and the release of 7-alkylguanines, guanine and adenine was followed. The half-lives of depurination were 1.5 and 4.1 min for 7-(2… (More)


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