Glycine–alanine conjugated macrocyclic lanthanide ion complexes as artificial ribonucleases
作者:Thorfinnur Gunnlaugsson、John E O'Brien、Sinéad Mulready
DOI:10.1016/s0040-4039(02)02071-3
日期:2002.11
The lanthanide ion based macrocyclic complexes 1La, 1Eu and 1Yb, were synthesised by the alkylation of L-alanine derived α-chloroamide, giving a tetrasubstituted GlyAla conjugated azamacrocycle using a 1,4,7,10-tetraazacyclododecane, followed by a complexation with either La(III), Eu(III) or Yb(III) triflate. Each complex gave rise to enhancements in the rate of hydrolysis of the phosphodiester of
镧系元素离子基大环配合物1La,1Eu和1Yb通过L-丙氨酸衍生的α-氯酰胺的烷基化反应合成,使用1,4,7,10-四氮杂环十二烷生成四取代的GlyAla共轭氮杂大环,然后与其中一种进行络合La(III),Eu(III)或三氟甲磺酸Yb(III)。在pH 7.4和37°C下,每种复合物均可提高RNA模仿化合物HPNP的磷酸二酯的水解速率。对于1La水解显示出双重pH行为,其中在狭窄的pH窗口内,HPNP的水解在6.5和7.0之间大大增强,而在7.2和7.4之间降低。在较高的pH值(高于8)下,速率再次大大提高。我们得出结论,这些增强是由于镧系元素离子络合后在1中形成疏水腔,以及金属离子对磷酸二酯的路易斯酸活化所致。因此,这些复合物模仿了许多核糖核酸酶活性位点的性质。