摘要:
2'-Deoxyadenosine (dA) and 2'-deoxyguanosine (dG) were reacted with the mutagenic epoxide glycidamide (GA, Scheme 1). The reactions yielded three GA-dA adducts (NI-GA-dA, N-6-GA-dA and N1-GA-dI) and two GA-dG adducts (N1-GA-dG I and N1-GA-dG II) (Scheme 2). The structures of the adducts were characterized by spectroscopic and spectrometric methods (H-1-C-13, and 2D NMR, MS, UV). The mechanism of the amide hydrolysis taking place during formation of the adducts N1-GA-dA and N1-GA-dG I was studied. We propose a mechanism where a transamidation is the key step in the hydrolysis of the amide function of GA.