Intraduplex DNA-Mediated Electrochemistry of Covalently Tethered Redox-Active Reporters
作者:Catrina G. Pheeney、Jacqueline K. Barton
DOI:10.1021/ja408135g
日期:2013.10.9
Intraduplex DNA-mediated reduction is established as a general mechanism for the reduction of distally bound stacked redox-active species covalently tethered to DNA through flexible alkane linkages. Methylene Blue (MB), Nile Blue (NB), and Anthraquinone (AQ) were covalently tethered to DNA with three different covalent linkages. Using these reporters DNA electrochemistry was shown to be both DNA-mediated
双链内 DNA 介导的还原被确立为减少远端结合的堆叠氧化还原活性物质通过灵活的烷烃键共价连接到 DNA 的一般机制。亚甲蓝 (MB)、尼罗蓝 (NB) 和蒽醌 (AQ) 通过三个不同的共价键共价连接到 DNA。使用这些报告基因的 DNA 电化学被证明是 DNA 介导的和内部双链体,而不是内部双链体。重要的是,通过 DNA π-stack 发生的电荷传输路径是通过使用介入的 AC 错配来打破这条路径来建立的。DNA 介导的 MB 减少主要通过双链内插入发生,这一事实是通过改变相邻双链 DNA 的接近度和完整性来确定的。