A sequence-specific threading tetra-intercalator with an extremely slow dissociation rate constant.

A sequence-specific threading tetra-intercalator with an extremely slow dissociation rate constant.
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DOI:
10.1038/nchem.1151
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发表时间:
2011-09-25
期刊:
影响因子:
21.8
通讯作者:
--
中科院分区:
化学1区
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--
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一个长寿命和序列特异性的配体- dna复合体将使长时间调节生物过程成为可能。我们一直在研究DNA识别的穿线多插层方法,其中芳香单元链通过双螺旋反复地来回穿线。在这里,我们报告了初步的序列特异性和详细的动力学分析的结构特征螺纹四轴加速器。在相对较长的DNA链上观察到特异性结合,强烈倾向于预测的14碱基对序列。动力学研究揭示了一个多步骤的关联过程,并发现特异性主要源于解离率的巨大差异。重要的是,四价络合物从其首选结合位点解离的限速解离速率常数非常慢,对应于16天的半衰期,使其成为迄今为止测量的较长的非共价络合物之一,并且,据我们所知,是DNA结合分子中最长的。
A long-lived and sequence specific ligand-DNA complex would make possible the modulation of biological processes for extended periods. We have been investigating the threading polyintercalation approach to DNA recognition in which chains of aromatic units thread back and forth repeatedly through the double helix. Here we report the preliminary sequence specificity and detailed kinetic analysis of a structurally characterized threading tetraintercalator. Specific binding on a relatively long DNA strand was observed, strongly favoring a predicted 14-base pair sequence. Kinetic studies revealed a multi-step association process and specificity was found to derive primarily from large differences in dissociation rates. Importantly, the rate-limiting dissociation rate constant of the tetraintercalator complex dissociating from its preferred binding site was extremely slow, corresponding to a 16 day half-life, making it one of the longer non-covalent complex half-lives yet measured, and, to the best of our knowledge, the longest for a DNA binding molecule.
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