Bimetallic Cu2+ complexes of bis-terpyridine ligands as catalysts of the cleavage of mRNA 5′-cap models. The effect of linker length and base moiety
作者:Leena Maanpää、Vincent Luzet、Glemence Guillaume、Sharmin Taherpour、Esa Mäki、Satu Mikkola
DOI:10.1039/b821724f
日期:——
Ligands, where two terpyridine units are linked via an alkyl chain of three to five methylene units, have been synthesized. Their Cu2+ complexes have been studied as catalysts for the hydrolysis of the triphosphate bridge of three different dinucleoside triphosphates. The results show that the bimetallic complexes are up to 600 times more efficient catalysts than monomeric Cu2+-TerPy, and up to 5 Ã 105-fold rate enhancement in comparison to the uncatalysed reaction, is achieved. However, the catalytic activity strongly depends on the length of the linker and the base composition of the substrate. The differences can be attributed to interactions between the Cu2+-TerPy and nucleic acid base moieties as well as steric factors that may hinder the productive interaction between the substrate and the catalyst.
已经合成了两种吡啶类配体,这些配体通过三个到五个亚甲基单元的烷基链连接。它们的Cu2+复合物作为三种不同二核苷酸三磷酸的三磷酸桥水解反应的催化剂进行了研究。结果表明,这些双金属复合物的催化效率比单体Cu2+-TerPy高出最多600倍,与未催化反应相比,速率增强可达到5 × 10^5倍。然而,催化活性强烈依赖于连接链的长度和底物的碱基组成。这些差异可以归因于Cu2+-TerPy与核酸碱基部分之间的相互作用,以及可能妨碍底物与催化剂之间有效相互作用的立体因素。