Imprinting Structural Information from a GpG Ligand into the Configuration of a Chiral Diamine Ligand through Second-Sphere Communication in Platinum(II) Complexes
作者:Kevin M. Williams、Tommaso Scarcia、Giovanni Natile、Luigi G. Marzilli
DOI:10.1021/ic000067n
日期:2001.1.1
designated, for example, as R,R,R,R. This ligand has greater flexibility and more readily inverted N centers than ligands used previously in GpG retro models. One goal was to determine whether the GpG ligand can control the configuration of a carrier ligand. (R,R,R,R)-Me2DAPPt(GpG) forms the anti, anti HH1 R variant almost exclusively. Equal populations of the two possible linkage isomers of (S,R,R,R)-Me2DAPPt(GpG)
顺铂与DNA形成顺式-Pt(NH3)2(d(GpG))交联。我们最近通过使用“复古模型”(具有旨在减慢d(GpG)动态运动的笨重载体配体的复合物)创建了新颖的d(GpG)构象。我们的结果定义了四个构象类别:HH1,HH2,δHT1和δHT2,具有头对头或头对尾的碱基方向,且磷酸二酯主链的传播方向为正常(1)或相反(2) 。此外,每个G残基可以是顺式或反式的,并且基本倾斜可以是左手(L)或右手(R)。因此,可以想到顺式-Pt(NH3)2(d(GpG))的32个变体,但加合物的动力学太动态而无法研究。到目前为止,通过使用逆向模型,我们获得了d(GpG)的五个变异体的证据,而GpG的只有四个变异体的证据。因此,我们选择Me2DAPPt(GpG)配合物用于1H和31P NMR光谱研究,CD光谱学以及分子力学和动力学(MMD)计算。配位的Me2DAP(N,N'-二甲基-2,4-二氨基戊烷)具有N,C