Synthesis of (6R)- and (6S)-5,10-dideazatetrahydrofolate oligo-γ-glutamates: Kinetics of multiple glutamate ligations catalyzed by folylpoly-γ-glutamate synthetase
作者:John W. Tomsho、John J. McGuire、James K. Coward
DOI:10.1039/b505907k
日期:——
mate synthetase (FPGS, EC 6.3.2.17) catalyzes the ATP-dependent ligation of glutamic acid to reduced folates including (6S)-5,6,7,8-tetrahydrofolate (H4PteGlu), as well as to anticancer drugs such as 5,10-dideaza-5,6,7,8-tetrahydrofolate ((6R)-DDAH4PteGlu1, (6R)-DDATHF, Lometrexol). Synthesis of unlabeled mono- and polyglutamates, DDAH4PteGlu(n) (6R, n = 1-6; 6S, n = 1-2), as well as (6R)-DDAH4Pte[14C]Glu1
叶酸聚γ-谷氨酸合成酶(FPGS,EC 6.3.2.17)催化谷氨酸与还原性叶酸(包括(6S)-5,6,7,8-四氢叶酸(H4PteGlu))以及抗癌药物的ATP依赖性连接。例如5,10-二氮杂-5,6,7,8-四氢叶酸((6R)-DDAH4PteGlu1,(6R)-DDATHF,洛美曲索)。未标记的单谷氨酸和多谷氨酸,DDAH4PteGlu(n)(6R,n = 1-6; 6S,n = 1-2)以及(6R)-DDAH4Pte [14C] Glu1的合成是由(6R)-或(6S)-5,10-二叠氮基七氢蝶酰叠氮化物和谷氨酸,H-Glu-γ-Glu(n)-γ-Glu-OH(n = 0-4)或[14C]谷氨酸。将这些化合物作为FPGS底物进行评估,以确定稳态动力学常数。观察到(6R)-DDAH4PteGlu1(对应于H(4)PteGlu的异构体)的Michaelis-Menten动力学,而对(6S)-DDAH4PteGlu(n)(n