Mutagenicity and DNA damage studies of N-acyloxy-N-alkoxyamides ? the role of electrophilic nitrogenElectronic supplementary information (ESI) available: a partial sequence of the pBR322 DNA, solvolysis rate constants and primary bimolecular rate constants. See http://www.rsc.org/suppdata/ob/b3/b301618h/
作者:Tony M. Banks、Antonio M. Bonin、Stephen A. Glover、Arungundrum S. Prakash
DOI:10.1039/b301618h
日期:——
N-Acyloxy-N-alkoxyamides are anomeric amides that are direct-acting mutagens. They have been shown to damage DNA in the major and the minor grooves in a pH and sequence-selective manner. In acidic media, they damage adenines at N3 in the minor groove but above neutral pH, only guanine is damaged at N7 in the major groove. Both the acyloxy leaving group and the alkoxy group at the amide nitrogen are responsible for their electrophilicity and Salmonella mutagenicities in TA100 and DNA damage data confirm that the mutagens react with DNA in an intact form, rather than by solvolysis to electrophilic nitrenium ions in the cytosol, or in vitro, prior to reacting with DNA. Hydrophobicity plays a role in both mutagenicity and DNA damage.
N-酰氧基-N-烷氧基酰胺是异头酰胺,是直接作用的诱变剂。它们已被证明能够以 pH 和序列选择性的方式损伤大沟和小沟中的 DNA。在酸性介质中,它们会破坏小沟 N3 处的腺嘌呤,但在中性 pH 值以上,只有大沟 N7 处的鸟嘌呤被破坏。酰胺氮上的酰氧基离去基团和烷氧基均导致其亲电性和 TA100 中的沙门氏菌致突变性,DNA 损伤数据证实诱变剂以完整形式与 DNA 发生反应,而不是通过溶剂分解为胞质溶胶中的亲电氮离子,或在体外,在与 DNA 反应之前。疏水性在致突变性和 DNA 损伤中都发挥着作用。