The phosphonodifluoromethyl ketone and phosphonofluoridate derivatives of L-glutamic acid were synthesized and characterized as analogues of the γ-glutamyl phosphate intermediate and the tetrahedral transition state, respectively, for the inhibition of γ-glutamylcysteine synthetase and glutamine synthetase. The former served as a poor inhibitor of both enzymes, but the latter inhibited glutamine synthetase with a Ki of 59 μM and partially inactivated the enzyme in an NH3- and ATP-dependent manner.
合成了
L-谷氨酸的膦酰二
氟甲基酮和膦酰
氟酸盐衍
生物,并分别将其表征为γ-谷
氨酰
磷酸中间体和四面体过渡态的类似物,用于抑制γ-谷
氨酰半胱
氨酸合成酶和谷
氨酰胺合成酶。前者对这两种酶的抑制效果较差,但后者对谷
氨酰胺合成酶的抑制 Ki 为 59 μM,并以依赖 NH3 和
ATP 的方式使酶部分失活。