Bisubstrate Inhibitors for the Enzyme Catechol O-Methyltransferase (COMT): Dramatic Effects of Ribose Modifications on Binding Affinity and Binding Mode
作者:Christian Lerner、Romain Siegrist、Eliane Schweizer、François Diederich、Volker Gramlich、Roland Jakob-Roetne、Gerhard Zürcher、Edilio Borroni
DOI:10.1002/hlca.200390093
日期:2003.4
Inhibition of the enzyme catechol O-methyltransferase (COMT) is of significant interest in the therapy of Parkinson's disease. Described herein are structural analogs of the potent bisubstrate inhibitor (−)-1 (IC50=9 nM; Table 1) for COMT, with target modifications of the central ribose moiety. Their synthesis involves, as key intermediates, adenosine derivatives, which are transformed to the potential
抑制儿茶酚O-甲基转移酶(COMT)在帕金森氏病的治疗中具有重大意义。本文描述了用于COMT的强效双底物抑制剂(-)- 1(IC 50 = 9 nM;表1)的结构类似物,具有中心核糖部分的目标修饰。其合成包括,关键中间体,腺苷衍生物,其由六个步骤:(a类似序列转化到电势双底物抑制剂方案1 - 4)。将化合物进行酶促测定以测定其体外通过动力学测量分析了对COMT的抑制活性,以及对辅因子S-腺苷甲硫氨酸(SAM)的结合侧的抑制机理(图3)。结合亲和力和结合模式都对核糖部分的修饰极其敏感(表1)。从(-)- 1变为(-)- 2(IC 50 = 28μM)后2'-OH基团的去除导致结合亲和力下降超过三个数量级。同时,相对于SAM结合位点保持竞争抑制动力学,从而支持双底物结合模式。与(−)- 2不同,双脱氧核糖抑制剂(-)- 3(IC 50 = 3μM)表现出混合,而环戊烷衍生物(+)- 4(IC