feasibility study for the application of our newly developed highlyefficient and robustfluorescence-resonance-energy-transfer (FRET) system to DNA. A 2′-oligodeoxynucleotide, 12, equipped with a quinolinone derivative as donor and a (bathophenanthroline)ruthenium(II) complex as acceptor and having a single uridine as potential cleavage site under basic conditions revealed an intensive FRET, which almost vanished
Functionalization of Mono- and Oligonucleotides with Phosphane Ligands by Amide Bond Formation
作者:Marzia Nuzzolo、Arnald Grabulosa、Alexandra M. Z. Slawin、Nico J. Meeuwenoord、Gijsbert A. van der Marel、Paul C. J. Kamer
DOI:10.1002/ejoc.201000125
日期:2010.6
Seven phosphane-functionalized deoxyuridines have been prepared by amidebondformation between aminodeoxyuridines and phosphanylcarboxylic acids. X-ray crystal structures for two of these new modified nucleosides have been obtained. The same coupling method has been extended to oligonucleotides. The phosphane containing strands have been purified and characterized by MALDI-TOF and, for the first time
已经通过氨基脱氧尿苷和膦酰羧酸之间的酰胺键形成制备了七种磷烷官能化脱氧尿苷。已经获得了这些新修饰核苷中的两个的 X 射线晶体结构。相同的偶联方法已扩展到寡核苷酸。含磷烷的链已通过 MALDI-TOF 和首次 31 P NMR 光谱法纯化和表征。磷烷修饰的 15 聚体与 [PdCl(η 3 -烯丙基)] 部分的配位已通过 31 P NMR 光谱证实。
Accurate Distance Determination of Nucleic Acids via Förster Resonance Energy Transfer: Implications of Dye Linker Length and Rigidity
作者:Simon Sindbert、Stanislav Kalinin、Hien Nguyen、Andrea Kienzler、Lilia Clima、Willi Bannwarth、Bettina Appel、Sabine Müller、Claus A. M. Seidel
DOI:10.1021/ja105725e
日期:2011.3.2
environments or very short DA distances, we introduce short linkers with a propargyl or alkenyl unit for internal labeling of nucleic acids to minimize position uncertainties. Studies by ensemble time correlated single photon counting and single-molecule detection show that the nature of the linker strongly affects the radius of the dye's accessible volume (6-16 Å). For short propargyl linkers, heterogeneous
在 Förster 共振能量转移 (FRET) 实验中,供体 (D) 和受体 (A) 荧光团通常通过长达 15 Å 的长柔性接头连接到感兴趣的大分子上。由于可能的染料-染料相互作用,这会导致定量距离测量的显着不确定性,并阻止在染料附着点之间进行短距离实验。我们提出了两种方法来克服上述问题,如对一系列 dsDNA 和 dsRNA 的 FRET 测量所证明的,这些 dsDNA 和 dsRNA 分别用 Alexa488 和 Cy5 作为 D 和 A 染料进行了内部标记。首先,我们通过分析荧光寿命和各向异性衰减来表征接头长度和灵活性对不同染料接头类型(长、中、短)的 FRET 的影响。对于长链接器,我们描述了一个简单的过程,通过适当考虑染料的位置分布和接头动力学,可以非常准确地确定基于 FRET 的结构。位置分布可以通过几何可及体积 (AV) 模拟快速计算,前提是染料附近的 RNA 或 DNA 的
Oligonucleotide labelling: A concise synthesis of a modified thymidine phosphoramidite