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The reaction of 3, 4-epoxy-1-butene with deoxyguanosine and DNA in vitro: synthesis and characterization of the main adducts
Istituto di Mutagenesi e Differenziamento del C.N.R. Via Svezia, 10, 56100 Pisa
1Istituto di Chimica Organica, Facoltą di Farmacia dell'Universitą Via Bonanno, 6, 56100 Pisa, Italy
The reaction of guanosine with 3, 4-epoxy-1-butene in acetic acid gives two main products of N-7 alkylation. After acidic hydrolysis the two aglycones have been isolated by h.p.l.c. and shown to be the regioisomeric 7-(2-hydroxy-3-buten-1-yl) guanine(I) and 7-(1-hydroxy-3-buten-2-yl) guanine(II), arising through nudeophilic attack by N-7 of the purine at the two oxirane carbons of 3, 4-epoxy-1-butene. Spectral characteristics of both compounds are presented, including u.v., 1H n.m.r. and mass spectra. Deoxyguanosine reacts with 3, 4-epoxy-1-butene in 50% methanol-water at 37°C to give the N-7 akylated deoxynucleosides corresponding to I and II in a 59:41 ratio. The reaction rate depends on the nudeoside concentration, with second order rate constants at 37°C of 1.6 × 10–2 and 1.1 ×10–2 h–1 M–1 for the formation of the two deoxynucleoside adduct corresponding to I and II, respectively. The same two compounds I and II in a similar (54:46) ratio have been identified after acidic or thermal hydrolysis of DNA which had been reacted with 3, 4-epoxy-1-butene under similar conditions. The half life for the spontaneous depurination of I and II in the adducted DNA under physiological conditions (37°C, pH 7.2) is 50 h.
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