Nitroxide-labeled pyrimidines for non-covalent spin-labeling of abasic sites in DNA and RNA duplexes
作者:Sandip A. Shelke、Gunnar B. Sandholt、Snorri Th. Sigurdsson
DOI:10.1039/c4ob01095g
日期:——
Of ten new pyrimidine-derived nitroxide spin labels, an N1-ethylamino triazole-linked uracil derivative binds fully to both DNA and RNA duplexes containing an abasic site, as determined by CW-EPR.
Site-Directed Spin-Labeling of Nucleic Acids by Click Chemistry: Detection of Abasic Sites in Duplex DNA by EPR Spectroscopy
作者:Ulla Jakobsen、Sandip A. Shelke、Stefan Vogel、Snorri Th. Sigurdsson
DOI:10.1021/ja102797k
日期:2010.8.4
motion of the spinlabel, consistent with formation of a metallopair between the T and the spin-labeled base that results in movement of the spinlabel out of the duplex and toward the solution. Thus, reposition of the spinlabel, when acting as a mercury(II)-controlled mechanical lever, can be readily detected by EPR spectroscopy. The ease of incorporation and properties of the newspinlabel make it attractive
本文描述了一种自旋标记,它可以检测和识别双链 DNA 中的局部结构变形,特别是无碱基位点。自旋标记通过一种新的合成后方法在固体支持物上使用点击化学结合到 DNA 中,这简化了自旋标记寡核苷酸的合成和纯化。通过短合成路线制备的氮氧官能化叠氮化物与含有 5-乙炔基-2'-dU 的低聚物反应。缀合以定量产率进行,并在修饰的核苷酸和氮氧化物自旋标记之间产生相当刚性的接头。自旋标记首次用于通过 X 波段 CW-EPR 光谱检测双链 DNA 中的无碱基位点,并提供有关其他结构变形以及 DNA 局部构象变化的信息。例如,与 T 错配对中自旋标签的迁移率降低与自旋标签从双链体中置换 T 是一致的。向该错配中添加汞 (II) 导致自旋标记的运动显着增加,这与 T 和自旋标记碱基之间形成金属对一致,导致自旋标记移出双链体和走向解决方案。因此,当作为汞 (II) 控制的机械杠杆时,自旋标签的重新定位可以很容易地通过
2′-Alkynylnucleotides: A Sequence- and Spin Label-Flexible Strategy for EPR Spectroscopy in DNA
作者:Marius M. Haugland、Afaf H. El-Sagheer、Rachel J. Porter、Javier Peña、Tom Brown、Edward A. Anderson、Janet E. Lovett
DOI:10.1021/jacs.6b05421
日期:2016.7.27
Electron paramagnetic resonance (EPR) spectroscopy is a powerful method to elucidate molecular structure through the measurement of distances between conformationally well-defined spin labels. Here we report a sequence-flexible approach to the synthesis of double spin-labeled DNA duplexes, where 2'-alkynylnucleosides are incorporated at terminal and internal positions on complementary strands. Post-DNA
电子顺磁共振 (EPR) 光谱是一种通过测量构象明确定义的自旋标记之间的距离来阐明分子结构的强大方法。在这里,我们报告了一种序列灵活的方法来合成双自旋标记的 DNA 双链体,其中 2'-炔基核苷结合在互补链的末端和内部位置。DNA 合成后铜催化的叠氮化物-炔环加成 (CuAAC) 反应与各种自旋标记物能够使用双电子-电子共振实验来测量双链体上的多个距离,提供高水平的详细结构信息。