Bisubstrate inhibitors for the enzyme catechol-O-methyltransferase (COMT): influence of inhibitor preorganisation and linker length between the two substrate moieties on binding affinity
作者:Christian Lerner、Birgit Masjost、Armin Ruf、Volker Gramlich、Roland Jakob-Roetne、Gerhard Zürcher、Edilio Borroni、François Diederich
DOI:10.1039/b208690p
日期:——
Inhibition of the enzyme catechol-O-methyltransferase (COMT) is an important approach in the treatment of Parkinson's disease. A series of new potent bisubstrate inhibitors for COMT, resulting from X-ray structure-based design and featuring adenosine and catechol moieties have been synthesised. Biological results show a large dependence of binding affinity on inhibitor preorganisation and the length of the linker between nucleoside and catechol moieties. The most potent bisubstrate inhibitor for COMT has an IC50 value of 9 nM. It exhibits competitive kinetics for the SAM and mixed inhibition kinetics for the catechol binding site. Its bisubstrate binding mode was confirmed by X-ray structure analysis of the ternary complex formed by the inhibitor, COMT and a Mg2+ ion.
抑制儿茶酚-O-甲基转移酶(COMT)是治疗帕金森病的重要方法。根据基于X射线结构设计的原理,一系列新型强效双底物COMT抑制剂已被合成,这些抑制剂具有腺苷和儿茶酚结构单元。生物学结果显示,结合亲和力对抑制剂的预组织结构及核苷与儿茶酚单元间连接链的长度有较大依赖性。对COMT最有效的双底物抑制剂的IC50值为9 nM。它对SAM结合位点表现出竞争性动力学特性,而对儿茶酚结合位点则呈现出混合抑制动力学特征。其双底物结合模式通过分析抑制剂、COMT及Mg2+离子形成的三元复合物的X射线结构得到确认。