Rapid Three-Step Cleavage of RNA and DNA Model Systems Promoted by a Dinuclear Cu(II) Complex in Methanol. Energetic Origins of the Catalytic Efficacy
作者:Zhong-Lin Lu、C. Tony Liu、Alexei A. Neverov、R. Stan Brown
DOI:10.1021/ja073780l
日期:2007.9.1
kinetics with a k(cat)/K(M) value of 30 M(-1) s(-1) which is 3.8 x 10(7)-fold greater than the methoxide promoted reaction of 3 (7.9 x 10(-7) M(-1) s(-1)). A free energy calculation indicates that the binding of 2-Cu(II)(2):(-OCH(3)) to the transition states for 1 and 3 cleavage stabilizes them by -21 and -24 kcal/mol, respectively, relative to that of the methoxide promoted reactions. The results are compared
1,3-双-N(1)-(1,5,9-三氮杂环十二烷基)丙烷与相关甲醇盐 (2-Cu(II)(2):(-OCH(3) )) 制备,及其与 RNA 模型(2-羟丙基-对硝基苯基磷酸酯 (1, HPNPP))和两个 DNA 模型(甲基对硝基苯基磷酸酯 (3) 和异丁基对氯苯基磷酸酯)的反应动力学(4)) 在 (s)(s) pH 7.2 +/- 0.2 的甲醇溶液中进行研究。2-Cu(II)(2):(-OH)(H(2)O)(CF(3)SO(3)-)(3):0.5CH(3)CH(2)的X射线衍射结构)OCH(2)CH(3) 和 2-Cu(II)(2):(-OH)((C(6)H(5)CH(2)O)(2)PO(2)-)( CF(3)SO(3)-)2 显示了第一个复合物中两个 Cu(II) 离子之间桥连 -OH 和 H(2)O 的配位模式,以及第二个复合物中桥连 -OH 和磷酸盐基团之间的配位模式。对 1