Chemical Synthesis and Preliminary Structural Characterization of a Nitrous Acid Interstrand Cross-Linked Duplex DNA
作者:Eric A. Harwood、Snorri Th. Sigurdsson、N. B. Fredrik Edfeldt、Brian R. Reid、Paul B. Hopkins
DOI:10.1021/ja984426d
日期:1999.6.1
amino group, followed by displacement by a nucleophile, such as water, or an amino group of another nucleotide. Nitrous acid-induced DNA interstrand cross-links form preferentially between two deoxyguanosine (dG) residues at the sequence [5 ′-d(CG)]2, forming a cross-link lesion in which the guanines share a common N2 atom (as in 1).7,10,11 It has been
亚硝酸是一种致突变物质;它将 DNA 的环外氨基转化为羰基 1-6,并在双链 DNA 中形成链间交联。7 由于人类在饮食和环境中接触可引发这些反应的氮氧化物,因此对这些反应产生了相当大的兴趣。例如,亚硝酸钠广泛用于腌制肉类的制备。8,9 据信,亚硝酸与 DNA 的反应是通过环外氨基的重氮化作用进行的,然后被亲核试剂(如水)或另一个核苷酸的氨基置换。亚硝酸诱导的 DNA 链间交联优先在序列 [5'-d(CG)]2 的两个脱氧鸟苷 (dG) 残基之间形成,形成一个交联损伤,其中鸟嘌呤共享一个公共 N2 原子(如1).7,10,