Structural Determinants of A<sub>3</sub> Adenosine Receptor Activation: Nucleoside Ligands at the Agonist/Antagonist Boundary
作者:Zhan-Guo Gao、Soo-Kyung Kim、Thibaud Biadatti、Wangzhong Chen、Kyeong Lee、Dov Barak、Seong Gon Kim、Carl R. Johnson、Kenneth A. Jacobson
DOI:10.1021/jm020211+
日期:2002.9.1
Trp243 (6.48) side chain, involved in recognition of the classical (nonnucleoside) A(3)AR antagonists but not adenosine-derived ligands, displayed a characteristic movement exclusively upon docking of agonists. Thus, A(3)AR activation appeared to require flexibility at the 5'- and 3'-positions, which was diminished in (N)-methanocarba, spiro, and epoxide analogues, and was characteristic of ribose interactions
人类A(3) 腺苷受体(AR) 的诱变表明某些氨基酸残基对配体结合和激活过程的贡献不同。在这里,我们证明了各种腺苷修饰,包括腺嘌呤取代和核糖环约束,也对这些过程有不同的贡献。比较了配体对表达 A(3)AR 和受体结合的完整 CHO 细胞中环 AMP 产生的影响。值得注意的是,单独的简单 2-氟基团或 2-氯与 N(6)-取代结合显着降低了腺苷衍生物的功效,甚至将激动剂转化为拮抗剂。其他增加亲和力的替代物,包括 N(6)-(3-iodobenzyl) 4 和 (Northern)-methanocarba 15,也降低了疗效,除了与灵活的 5'-脲酰胺结合使用。2-Cl-N(6)-(3-iodobenzyl) 衍生物,在(N)-methanocarba (即,Northern 构象) 和核苷系列18 和5,分别是有效的拮抗剂,几乎没有残留的激动作用。分别合成了核苷和 (N)-methanocarba