Probing the Existence of a Metastable Binding Site at the β<sub>2</sub>-Adrenergic Receptor with Homobivalent Bitopic Ligands
作者:Birgit I. Gaiser、Mia Danielsen、Emil Marcher-Rørsted、Kira Røpke Jørgensen、Tomasz M. Wróbel、Mikael Frykman、Henrik Johansson、Hans Bräuner-Osborne、David E. Gloriam、Jesper Mosolff Mathiesen、Daniel Sejer Pedersen
DOI:10.1021/acs.jmedchem.9b00595
日期:2019.9.12
development of bitopic ligands aimed at targeting the orthosteric binding site (OBS) and a metastable binding site (MBS) within the same receptor unit. Previous molecular dynamics studies on ligand binding to the β2-adrenergic receptor (β2AR) suggested that ligands pause at transient, less-conserved MBSs. We envisioned that MBSs can be regarded as allosteric binding sites and targeted by homobivalent bitopic
在本文中,我们报道了针对同一受体单元内正构结合位点(OBS)和亚稳结合位点(MBS)的双配位配体的开发。先前对配体与β2-肾上腺素受体(β2AR)结合的分子动力学研究表明,配体在瞬时的,保守性较低的MBSs处暂停。我们设想,MBS可以被视为变构结合位点,并由连接两个相同药效基团的同双价双位配体靶向。基于拮抗剂(S)-普萘洛尔对接至OBS和MBS中来设计此类配体并进行合成。药理学特征显示,与(S)-阿普萘洛尔相比,配体具有相似的效价和亲和力,β2/β1AR选择性略有增加,和/或β2AR的离解速率大大降低。截短的双位配体表明亚稳态药效团的主要贡献是与β2AR的疏水相互作用,而单独的接头降低了正构片段的效力。总而言之,该研究强调了靶向MBS改善配体药理作用的潜力。