Thiolate Bridging and Metal Exchange in Adducts of a Zinc Finger Model and Pt<sup>II</sup> Complexes: Biomimetic Studies of Protein/Pt/DNA Interactions
作者:Elky Almaraz、Queite A. de Paula、Qin Liu、Joseph H. Reibenspies、Marcetta Y. Darensbourg、Nicholas P. Farrell
DOI:10.1021/ja711254q
日期:2008.5.1
yield the corresponding [Zn(dien)Cl](+) ion. Direct synthesis of the Zn-Pt thiolate-bridged species and the Pt(N2S2) chelate, where Pt has displaced the Zn from the chelate core, permitted the isolation of X-ray-quality crystals to confirm the bridging and metal-exchanged structures. The ESI-MS, (195)Pt NMR spectroscopy, and molecular structures of the di- and trinuclear complexes will be discussed
为铂 DNA 加合物与锌指蛋白的可能相互作用提供先例,复合物 [Pt(dien)Cl]Cl (dien = 二亚乙基三胺) 和 [Pt(terpy)Cl]Cl (terpy = 2,2':6' ,2''-三联吡啶) 暴露于 N,N'-双(2-巯基乙基)-1,4-二氮杂环庚烷锌 (II) 二聚体 [Zn(bme-dach)]2 和由电喷雾电离定义的产物质谱 (ESI-MS)、X 射线晶体学和 (195)Pt 核磁共振光谱。两种铂 (II) 配合物中离去氯化物的存在促进了涉及含硫锌指合成模型或锌指肽序列的亲电取代。通过 ESI-MS 监测,两种反应物都产生了 Zn-(mu-SR)-Pt 桥接的证据,随后锌从 N2S2 配位球中喷射出来,随后形成了三金属 Zn-(mu-SR)2-Pt-(mu-SR)2-Zn-桥接物种。Zn-(mu-SR)-Pt 桥接物种 [(Zn(bme-dach)Cl)(Pt(dien))]Cl