Structure-dependent binding of arylimidamides to the DNA minor groove.

Structure-dependent binding of arylimidamides to the DNA minor groove.
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DOI:
10.1002/cbic.201300622
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发表时间:
2014-01-03
期刊:
影响因子:
3.2
通讯作者:
Boykin, David W.
Boykin, David W.
中科院分区:
生物学3区
文献类型:
--
作者:
Chai, Yun;Munde, Manoj;Kumar, Arvind;Mickelson, Leah;Lin, Sen;Campbell, Nancy H.;Banerjee, Moloy;Akay, Senol;Liu, Zongying;Farahat, Abdelbasset A.;Nhili, Raja;Depauw, Sabine;David-Cordonnier, Marie-Helene;Neidle, Stephen;Wilson, W. David;Boykin, David W.

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杂环二脒是强DNA小沟结合剂,具有优异的抗寄生虫活性。为了扩大这些化合物的生物活性,我们合成了一系列在利什曼原虫和T.比二脒更好的化合物。通过Tm、荧光置换滴定、圆二色性、DNA酶I足迹、生物传感器表面等离子体共振、X射线晶体学和分子模拟等方法研究了AIA与DNA的结合。这些化合物与DNA小沟中的AT序列形成1:1复合物,并且结合强度随取代基大小、电荷和极性而变化。该取代基依赖性结构和性质提供了可用于估计在该系列中与DNA结合的K值的SAR。结构的结果和分子模拟研究提供了一个解释的差异,结合亲和力的AIA。
Heterocyclic diamidines are strong DNA minor groove binders and have excellent antiparasitic activity. To extend the biological activity of these compounds, a series of arylimidamides (AIAs) analogs, which have better uptake properties in Leishmania and T. cruizi than diamidines, was prepared. The binding of the AIAs to DNA was investigated by Tm, fluorescence displacement titration, circular dichroism, DNase I footprinting, biosensor surface plasmon resonance, X-ray Crystallography and molecular modeling. These compounds form 1:1 complexes with AT sequences in the DNA minor groove and the binding strength varies with substituent size, charge and polarity. This substituent dependent structure and properties provide a SAR that can be used to estimate K values for binding to DNA in this series. The structural results and molecular modeling studies provide an explanation for the differences in binding affinities for AIAs.
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