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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Binding of Ru(terpyridine)(pyridine)dipyridophenazine to DNA studied with polarized spectroscopy and calorimetry
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Binding of Ru(terpyridine)(pyridine)dipyridophenazine to DNA studied with polarized spectroscopy and calorimetry

机译:偏光光谱和量热法研究钌(吡啶)(吡啶)双吡啶吩嗪与DNA的结合

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摘要

Linear and circular dichroism (LD and CD) spectroscopy as well as isothermal titration calorimetry (ITC) have been used to investigate the interaction of Ru(tpy)(py)dppz(2+) (tpy = 2,2': 6',2 ''-terpyridyl; py = pyridine; dppz = dipyrido[3,2-a: 2' 3'-c]phenazine) with DNA, providing detailed information about the DNA binding thermodynamics and binding geometry of the metal complex. Flow LD, CD and isotropic absorption indicate that Ru(tpy)(py)dppz(2+) bind to DNA from the minor groove with the dppz ligand intercalated between base pairs, very similar to its chiral structural isomers Delta- and Delta-Ru(bpy)(2)dppz(2+) (bpy = 2,2'-bipyridine). A simple cooperative binding model with one binding geometry provide an excellent fit for calorimetric and absorption titration data. The values of the neighbor interaction thermodynamic parameters for Ru(tpy)(py)dppz(2+) suggest that complexes bound contiguously prefer to have their tpy ligands oriented towards the same strand.
机译:线性和圆二色性(LD和CD)光谱以及等温滴定量热法(ITC)已用于研究Ru(tpy)(py)dppz(2+)(tpy = 2,2':6', 2'-叔吡啶基; py =吡啶; dppz =双吡啶[3,2-a:2'3'-c]吩嗪),提供有关DNA结合热力学和金属配合物结合几何结构的详细信息。流LD,CD和各向同性吸收表明Ru(tpy)(py)dppz(2+)从小沟结合到DNA,dppz配体插入碱基对之间,非常类似于其手性结构异构体Delta-和Delta-Ru (bpy)(2)dppz(2+)(bpy = 2,2'-联吡啶)。具有一个绑定几何形状的简单协作绑定模型非常适合量热和吸收滴定数据。 Ru(tpy)(py)dppz(2+)的邻域相互作用热力学参数的值表明,连续结合的复合物更倾向于使其tpy配体朝向同一链。

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