DNA recognition agents based on the indole-based aziridinyl eneimine and the cyclopent[b]indole methide species are described. The recognition process involved either selective alkylation or intercalating interactions in the major groove. DNA cleavage resulted from phosphate backbone alkylation (hydrolytic cleavage) and N(7)-alkylation (piperidine cleavage). The formation and fate of the eneimine was studied using enriched
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C NMR spectra and x-ray crystallography. The aziridinyl eneimine specifically alkylates the N(7) position of DNA resulting in direction of the aziridinyl alkylating center to either the 3′- or 5′-phosphate of the alkylated base. The eneimine species forms dimers and trimers that appear to recognize DNA at up to three base pairs. The cyclopent[b]indole quinone methide recognizes the 3′-GT-5′ sequence and alkylates the guanine N(7) and the thymine 6-carbonyl oxygen causing the hydrolytic removal of these bases. New classes of DNA recognition agents have been developed and the utility of
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C-enrichment and
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C-NMR to study DNA alkylation reactions is disclosed.
本文介绍了基于
吲唑烯烯胺和环戊[b]
吲哚亚甲基物种的DNA识别剂。识别过程涉及到主沟槽中的选择性烷基化或插入作用。
磷酸骨架烷基化(
水解裂解)和N(7)烷基化(
吡啶裂解)导致DNA裂解。使用富集的13C NMR光谱和X射线晶体学研究了烯烯胺的形成和命运。
吲唑烯烯胺特异性烷基化DNA的N(7)位,从而将
吲唑烯烷基化中心的方向定向到烷基化碱基的3'-或5'-
磷酸。烯烯胺物种形成二聚体和三聚体,似乎能够识别DNA的最多三个碱基对。环戊[b]
吲哚醌亚甲基物种识别3'-GT-5'序列,并烷基化
鸟嘌呤N(7)和胸腺
嘧啶6-羰基氧,导致这些碱基的
水解去除。开发了新的DNA识别剂类别,并披露了13C富集和13C-NMR用于研究DNA烷基化反应的实用性。