Organometallic complexes of the general formula [(η6-arene)Ru(N⁁N)Cl]+ and [(η5-Cp*)Rh(N⁁N)Cl]+ where N⁁N is a 2,2′-dipyridylamine (DPA) derivative carrying a thiol-targeted maleimide group, 2,2′-bispyridyl (bpy), 1,10-phenanthroline (phen) or ethylenediamine (en) and arene is benzene, 2-chloro-N-[2-(phenyl)ethyl]acetamide or p-cymene were identified as catalysts for the stereoselective reduction of the enzyme cofactors NAD(P)+ into NAD(P)H with formate as a hydride donor. A thorough comparison of their effectiveness towards NAD+ (expressed as TOF) revealed that the RhIII complexes were much more potent catalysts than the RuII complexes. Within the RuII complex series, both the N⁁N and arene ligands forming the coordination sphere had a noticeable influence on the activity of the complexes. Covalent anchoring of the maleimide-functionalized RuII and RhIII complexes to the cysteine endoproteinase papain yielded hybrid metalloproteins, some of them displaying formate dehydrogenase activity with potentially interesting kinetic parameters.
通式为[(η6-
蒈烯)Ru(N⁁N)Cl]+ 和[(η5-Cp*)Rh(N⁁N)Cl]+ 的有机
金属配合物,其中 N⁁N 是携带巯基马来
酰亚胺基团的
2,2′-二
吡啶胺 (DPA) 衍
生物、
2,2′-双
吡啶 (bpy)、1、这些
催化剂可将酶辅助因子
NAD(P)+ 以
甲酸盐为
氢化物供体立体选择性还原为
NAD(P)H。对它们对
NAD+ 的有效性(以 TOF 表示)进行全面比较后发现,RhIII 复合物比 RuII 复合物具有更强的催化作用。在 RuII 复合物系列中,形成配位层的 N⁁N
配体和炔
配体对复合物的活性都有明显的影响。将马来
酰亚胺功能化的 RuII 和 RhIII 复合物与半胱
氨酸内切
蛋白酶木瓜蛋白酶共价锚定可产生混合
金属蛋白,其中一些显示出
甲酸脱氢酶活性,并具有潜在的有趣动力学参数。