Synthesis of β-ketophosphonate analogs of glutamyl and glutaminyl adenylate, and selective inhibition of the corresponding bacterial aminoacyl-tRNA synthetases
作者:Christian Balg、Sébastien P. Blais、Stéphane Bernier、Jonathan L. Huot、Manon Couture、Jacques Lapointe、Robert Chênevert
DOI:10.1016/j.bmc.2006.09.056
日期:2007.1.1
Escherichia coli glutamyl-tRNA synthetase (GluRS) with a K(i) of 18microM with respect to its substrate glutamate, and binds at one site on this monomeric enzyme; the non-cognate Gln-KPA also binds this GluRS at one site, but is a much weaker (K(i)=2.9mM) competitive inhibitor. By contrast, Gln-KPA inhibits E. coli glutaminyl-tRNA synthetase (GlnRS) by binding competitively but weakly at two distinct sites
氨酰基-β-酮膦酸酯-腺苷(aa-KPA)是氨酰基腺苷酸酯的稳定类似物,它们是通过氨酰基-tRNA合成酶(aaRS)催化形成氨酰基-tRNA的高能中间体。我们已经合成了谷氨酰-β-酮膦酸酯-腺苷(Glu-KPA)和谷氨酰胺-β-酮膦酸酯-腺苷(Gln-KPA),并测试了它们作为其同源aRS和非同源aRS的抑制剂。Glu-KPA是大肠杆菌谷氨酰tRNA合成酶(GluRS)的竞争性抑制剂,相对于其底物谷氨酸,K(i)为18microM,并在该单体酶的一个位点结合。非同源的Gln-KPA也可以在一个位点结合该GluRS,但竞争性抑制剂(K(i)= 2.9mM)弱得多。相比之下,Gln-KPA抑制E。大肠杆菌谷氨酰胺基-tRNA合成酶(GlnRS),通过竞争性结合但在该酶的两个不同位点弱结合(平均K(i)为0.65mM);非同源Glu-KPA显示出对GlnRS的一处弱竞争性抑制(K(i)= 2.8