Dibenzodiazepinone-type muscarinic receptor antagonists conjugated to basic peptides: Impact of the linker moiety and unnatural amino acids on M2R selectivity
作者:Corinna. G. Weinhart、David Wifling、Maximilian. F. Schmidt、Eduard Neu、Carina Höring、Timothy Clark、Peter Gmeiner、Max Keller
DOI:10.1016/j.ejmech.2021.113159
日期:2021.3
continuation of our work on dualsteric dibenzodiazepinone-type M2R antagonists, a series of M2R ligands containing a dibenzodiazepinone pharmacophore linked to small basic peptides was synthesized (64 compounds). The linker moiety was varied with respect to length, number of basic nitrogens (0-2) and flexibility. Besides proteinogenic basic amino acids (Lys, Arg), shorter homologues of Lys and Arg, containing
人类毒蕈碱型乙酰胆碱受体(MRs)家族的特征是五个亚型(M 1 R-M 5 R)之间具有高度的序列同源性,这是缺乏亚型选择性MR配体的原因。在继续研究双空间二苯并二氮杂醌型M 2 R拮抗剂时,一系列M 2合成了含有与小碱性肽连接的二苯并二氮杂酮药效团的R配体(64种化合物)。接头部分的长度,碱性氮原子数(0-2)和柔韧性有关。除了蛋白原性碱性氨基酸(Lys,Arg)之外,还掺入了分别含有三个和两个亚甲基的Lys和Arg的较短同源物,以及D-构型氨基酸。接头的类型对M 2 R亲和力有显着影响,并且还影响了M 2 R选择性。相反,碱性肽的结构比M 2 R亲和力决定了M 2 R选择性。例如,至多M 2 - [R选择性化合物(UR-CG188,89与皮摩尔M)2 R亲和力(p K i 9.60),表现出更高的M 2 R选择性(K i M 1 R / M 2 R / M 3 R / M 4 R / M