Delta chirality ruthenium 'light-switch' complexes can bind in the minor groove of DNA with five different binding modes.

Delta chirality ruthenium 'light-switch' complexes can bind in the minor groove of DNA with five different binding modes.
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DOI:
10.1093/nar/gkw753
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发表时间:
2016-11-02
影响因子:
14.9
通讯作者:
Cardin CJ
Cardin CJ
中科院分区:
生物学2区
文献类型:
--
作者:
Hall JP;Keane PM;Beer H;Buchner K;Winter G;Sorensen TL;Cardin DJ;Brazier JA;Cardin CJ

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[Ru(phen)2(dppz)]2+由于其“光开关”性质自20世纪90年代以来一直被研究。它可以用作发光DNA探针,通过DNA结合来打开发射。所观察到的发光依赖于吡嗪氮原子的溶剂可及性,因此对阳离子结合位点和发色团取向的变化敏感。该化合物也是手性的,并且当与各种DNA序列结合时,对映体之间在发射行为方面存在明显差异。虽然有许多二元DNA复合物的X射线晶体结构是可用的,但大多数包括Λ对映异构体,并且关于Δ对映异构体结合的结构信息非常少。在这里,我们提出了第一个X射线晶体结构的Δ对映体结合到匹配良好的DNA,在没有其他,Λ对映体。我们展示了这里观察到的结合位点如何与晶体学文献中更一般的图案相关,并提出Δ对映体可以与五种不同的结合模式结合,为溶液数据的解释提供了一个新的假设。
[Ru(phen)2(dppz)]2+ has been studied since the 1990s due to its ‘light-switch’ properties. It can be used as a luminescent DNA probe, with emission switched on through DNA binding. The luminescence observed is dependent on the solvent accessibility of the pyrazine nitrogen atoms, and therefore is sensitive to changes in both binding site of the cation and chromophore orientation. The compound is also chiral, and there are distinct differences between the enantiomers in terms of the emission behaviour when bound to a variety of DNA sequences. Whilst a number of binary DNA-complex X-ray crystal structures are available, most include the Λ enantiomer and there is very little structural information about binding of the Δ enantiomer. Here, we present the first X-ray crystal structure of a Δ enantiomer bound to well-matched DNA, in the absence of the other, Λ enantiomer. We show how the binding site observed here can be related to a more general pattern of motifs in the crystallographic literature and propose that the Δ enantiomer can bind with five different binding modes, offering a new hypothesis for the interpretation of solution data.
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