<i>N</i><sup>6</sup>-Substituted 5′-<i>N</i>-Methylcarbamoyl-4′-selenoadenosines as Potent and Selective A<sub>3</sub> Adenosine Receptor Agonists with Unusual Sugar Puckering and Nucleobase Orientation
作者:Jinha Yu、Long Xuan Zhao、Jongmi Park、Hyuk Woo Lee、Pramod K. Sahu、Minghua Cui、Steven M. Moss、Eva Hammes、Eugene Warnick、Zhan-Guo Gao、Minsoo Noh、Sun Choi、Hee-Chul Ahn、Jungwon Choi、Kenneth A. Jacobson、Lak Shin Jeong
DOI:10.1021/acs.jmedchem.7b00241
日期:2017.4.27
Potent and selective A3 adenosine receptor (AR) agonists were identified by the replacement of 4'-oxo- or 4'-thionucleosides with bioisosteric selenium. Unlike previous agonists, 4'-seleno analogues preferred a glycosidic syn conformation and South sugar puckering, as shown in the X-ray crystal structure of 5'-N-methylcarbamoyl derivative 3p. Among the compounds tested, N6-3-iodobenzyl analogue 3d
通过用生物等位硒取代4'-氧代-或4'-硫代核苷来鉴定有效和选择性的A3腺苷受体(AR)激动剂。与先前的激动剂不同,如5'-N-甲基氨基甲酰基衍生物3p的X射线晶体结构所示,4'-硒类似物更喜欢糖苷的顺式构象和南糖起皱。在测试的化合物中,发现N6-3-碘苄基类似物3d是最有效的A3AR完全激动剂(Ki = 0.57 nM),对A1AR和A2AAR的选择性分别是≥800倍和1900倍。在N6-环烷基系列中,2-Cl类似物通常比2-H类似物表现出更好的hA3AR亲和力,而在N6-3-卤代苄基系列中2-H> 2-Cl。N7异构体3t和3u的结合力比相应的N9异构体弱得多,但化合物3t缺乏A3AR活化,似乎是弱者。2-Cl-N6-3-碘苄基类似物3p抑制小分子胶质细胞/单核细胞趋化性诱导的迁移,而在≤50μM时不引起细胞死亡。这表明开发4'-硒代核苷A3AR激动剂作为新型抗中风剂的潜力。