Design, Synthesis, and Biochemical Evaluation of Phosphonate and Phosphonamidate Analogs of Glutathionylspermidine as Inhibitors of Glutathionylspermidine Synthetase/Amidase from <i>Escherichia coli</i>
作者:Shoujun Chen、Chun-Hung Lin、David S. Kwon、Christopher T. Walsh、James K. Coward
DOI:10.1021/jm970414b
日期:1997.11.1
phosphapeptides designed to mimic two distinct tetrahedral intermediates formed during either the synthesis or hydrolysis of glutathionylspermidine (Gsp) were synthesized and evaluated as inhibitors of the bifunctional enzyme Gsp synthetase/amidase. While the polyamine-containing phosphapeptides were determined to be potent and selective inhibitors, they selectively inhibit the synthetase activity over
合成了设计用来模拟在谷胱甘肽亚精胺(Gsp)的合成或水解过程中形成的两个不同的四面体中间体的三种磷酸肽,并将其作为双功能酶Gsp合成酶/酰胺酶的抑制剂进行评估。虽然确定含多胺的磷酸肽是有效的和选择性的抑制剂,但它们在酰胺酶结构域上选择性地抑制了合成酶的活性。含膦酸酯的四面体模拟物是Gsp合成酶的可逆混合型抑制剂,与游离酶(Ki)结合的抑制剂的抑制常数为6 microM,与酶-底物复合物(Ki' )。相应的氨基磷酸膦酸酯是一种缓慢结合的抑制剂,Ki为24 microM,Ki *(异构化抑制常数)为0.88 microM。