Mapping of the active site of rat kidney γ-glutamyl transpeptidase using activated esters and their amide derivatives
作者:Roselyne Castonguay、Christian Lherbet、Jeffrey W Keillor
DOI:10.1016/s0968-0896(02)00165-7
日期:2002.12
usually an amino acid or a peptide. In order to investigate which moieties of the donor substrate are necessary for recognition by GGT, the structure of the well-recognized substrate L-gamma-glutamyl-p-nitroanilide was modified. Several activated esters and their amide derivatives were synthesized and used as substrates. Kinetic (K(m) and V(max)) and inhibition constants (K(i)) were measured and reveal
涉及许多生理过程的酶γ-谷氨酰转肽酶(GGT)催化γ-谷氨酰基从供体底物向酰基受体底物(通常是氨基酸或肽)的转移。为了研究供体底物的哪些部分对于通过GGT识别是必需的,对公认的底物L-γ-谷氨酰基-对硝基苯胺的结构进行了修饰。合成了几种活化的酯及其酰胺衍生物,并用作底物。测量了动力学(K(m)和V(max))和抑制常数(K(i)),结果表明,几乎整个γ-谷氨酰基部分对于识别供体底物的结合位点都是必需的。