NMR relaxometric study of new GdIII macrocyclic complexes and their interaction with human serum albumin
作者:Mauro Botta、Silvio Quici、Gianluca Pozzi、Giovanni Marzanni、Roberto Pagliarin、Serena Barra、Simonetta Geninatti Crich
DOI:10.1039/b313677a
日期:——
Five novel Gd(iii) complexes based on the structure of the heptadentate macrocyclic 1,4,7,10-tetraazacyclododecane-1,4,7-triacetic acid (DO3A) ligand have been synthesized and their (1)H and (17)O NMR relaxometric properties investigated in detail. The complexes have been functionalised on the secondary nitrogen atom of the macrocyclic ring with different pendant groups for promoting their ability
基于七齿大环1,4,7,10-四氮杂环十二烷-1,4,7-三乙酸(DO3A)配体的结构,已合成了五种新型Gd(iii)配合物,它们的(1)H和(17)详细研究了O NMR弛豫特性。配合物已在具有不同侧基的大环的仲氮原子上官能化,以增强其与人血清白蛋白(HSA)非共价相互作用的能力。对质子弛豫性的分析(作为pH和磁场强度的函数)显示,带有聚(乙二醇)(PEG)链的三个配合物具有单个配位的水分子,而被1- [ 3-(2-羟基苯基)]-丙基和1- [3-(2-羧基苯氧基)]-丙基侧基具有两个内球水分子。通过可变温度(17)O NMR测得的水交换速率涵盖了很宽的数值范围(从18到770 ns),取决于它们的电荷,取代基的化学性质及其组织第二个球形的能力。水结合位点附近的水合作用。所有的复合物都显示出与HSA的某种程度的相互作用,对于在侧基上带有芳香基团的化合物,结合亲和力更强。然而,在结合时,未观