Latent inhibitors. Part 4. Irreversible inhibition of dihydro-orotate dehydrogenase by hydantoins derived from amino acids
作者:Ian G. Buntain、Colin J. Suckling、Hamish C. S. Wood
DOI:10.1039/p19880003175
日期:——
Hydantoins and ureas derived from α-amino acids are shown to interact with dihydro-orotate dehydrogenase from Clostridium(Zymobacterium)oroticum, chiefly as weak competitive inhibitors but that the hydantoin derived from phenylalanine, 5-benzyl-3-(1-carboxy-2-phenylethyl)hydantoin, is a time-dependent irreversible inhibitor of the enzyme. Inhibition experiments with derivatives of this hydantoin and
乙内酰脲和从α-氨基酸衍生的脲被示出为与相互作用从二氢乳清酸脱氢酶梭菌(Zymobacterium)oroticum,主要是作为弱竞争性抑制剂,但衍生自苯丙氨酸的乙内酰脲,5-苄基-3-(1-羧基-2-苯基乙基)乙内酰脲是该酶的时间依赖性不可逆抑制剂。用该乙内酰脲的衍生物及其固有的化学反应性进行的抑制实验导致了一种假设的抑制反应机理,该机制涉及乙内酰脲的苄基氧化,然后迈克尔加成酶亲核试剂。通过分子图比较底物和抑制剂的结构,讨论了该反应与正常底物氧化反应之间的关系。