Synthesis, structural and biological evaluation of GlyAla based lanthanide macrocyclic conjugates as supramolecular ribonuclease mimics
作者:Thorfinnur Gunnlaugsson、R.Jeremy H Davies、Mark Nieuwenhuyzen、John E O'Brien、Clarke S Stevenson、Sinéad Mulready
DOI:10.1016/s0277-5387(02)01402-x
日期:2003.3
The glycine–alanine conjugated ligands of cyclen (1,4,7,10,-tetraazacyclododecane) 1 and 2, possessing methyl and benzyl alanine esters respectively, and the corresponding lanthanide complexes 1La, 1Eu, 1Tb, 1Yb, 2La, 2Eu, and 2Tb were designed with the aim of mimicking the nature of the hydrophobic cavity of ribonucleases. X-ray crystallographic investigations showed that 2Tb has a typical monocapped
环己酮(1,4,7,10,-四氮杂环十二烷)1和2的甘氨酸-丙氨酸共轭配体分别具有甲基和苄基丙氨酸酯,以及相应的镧系元素络合物1La,1Eu,1Tb,1Yb,2La,2Eu和设计2Tb的目的是模仿核糖核酸疏水腔的性质。X射线晶体学研究表明2Tb具有典型的单峰方形反棱镜几何结构,其中Tb(III)离子为中心,与第九个配位环的环素环的四个氨基部分和四个甘氨酸残基的酰胺羰基的四个氧原子配位被水分子占据的协调位点。已显示所有配合物均能促进2-羟丙基对硝基苯基磷酸酯(HPNP,τ1 /2 = 5.78×10 3 h)的磷酸二酯键的水解,其中1Tb在pH 7.4和pH 7.4下最有效地促进这种水解。 37℃的1LN家庭用τ 1/2 = 4.9小时。对于2Ln家庭,2La是最有效地促进HPNP的水解,与τ 1/2 = 3.7小时。还研究了1La和2La的水解速率与pH的关系,两种配合物在生理pH范围内均