Mechanism of Charge Transport in DNA: Internally-Linked Anthraquinone Conjugates Support Phonon-Assisted Polaron Hopping
作者:Danith Ly、Laurie Sanii、Gary B. Schuster
DOI:10.1021/ja991753s
日期:1999.10.1
complement. The AQ-conjugates were designed to have GGsteps disposed symmetrically about the AQ intercalation site. The distance dependence of reaction efficiency at GGsteps following AQ irradiation was measured by means of an AQ-containing 71 mer having 7 GGsteps. The efficiency of reaction in this sequence falls off exponentially with a distance dependence of 0.071 A-1. AQ-containing conjugates
制备了一系列含蒽醌 (AQ) 的 DNA 偶联物。在每种情况下,AQ 都与尿苷的 2'-氧相连。物理和光谱数据表明 AQ 嵌入在尿嘧啶 3' 侧的双链 DNA 中。用紫外线照射 AQ-DNA 偶联物会导致含 AQ 链及其互补链在 GG 步骤处需要哌啶的链断裂。AQ 偶联物被设计为具有围绕 AQ 嵌入位点对称布置的 GG 台阶。AQ 辐照后 GG 步骤的反应效率的距离依赖性是通过具有 7 个 GG 步骤的含 AQ 71 聚体来测量的。该序列中的反应效率呈指数下降,距离相关性为 0.071 A-1。制备含有 AQ 的偶联物,其中包含 7、不同位置的 8-dihydro-8-oxoguanines (8-OxoG)。8-OxoG 的氧化电位低于任何正常 DNA 碱基,可作为迁移自由基阳离子的陷阱。天...