A Novel Bifunctional Alkylphenol Anesthetic Allows Characterization of γ-Aminobutyric Acid, Type A (GABAA), Receptor Subunit Binding Selectivity in Synaptosomes
作者:Kellie A. Woll、Sruthi Murlidaran、Benika J. Pinch、Jérôme Hénin、Xiaoshi Wang、Reza Salari、Manuel Covarrubias、William P. Dailey、Grace Brannigan、Benjamin A. Garcia、Roderic G. Eckenhoff
DOI:10.1074/jbc.m116.736975
日期:2016.9
GABAA receptor, but the mechanistic details, including the relevant binding sites and alternative targets, remain disputed. Here we undertook an in-depth study of alkylphenol-based anesthetic binding to synaptic membranes. We designed, synthesized, and characterized a chemically active alkylphenol anesthetic (2-((prop-2-yn-1-yloxy)methyl)-5-(3-(trifluoromethyl)-3H-diazirin-3-yl)phenol, AziPm-click (1))
丙泊酚,一种静脉麻醉药,是GABAA受体的正调节剂,但其机制细节(包括相关的结合位点和替代靶点)仍存在争议。在这里,我们对基于烷基酚的麻醉剂与突触膜的结合进行了深入的研究。我们设计,合成和表征了具有化学活性的烷基酚麻醉药(2-((prop-2-yn-1-yloxy)methyl)-5-(3-(trifluoromethyl)-3H-diazirin-3-yl)phenol,AziPm单击(1)),以在小鼠突触小体内以天然状态的异丙酚结合蛋白进行基于亲和力的蛋白谱分析(ABPP)。ABPP策略捕获了大约4%的突触体蛋白质组,包括无偏见地捕获了五个α或βGABAA受体亚基。缺乏gamma2亚基的捕获不是由于丰度低引起的。与此相符 独立的分子动力学模拟和炼金术的自由能扰动计算可预测异丙酚与界面部位的选择性结合,与含γ的界面相比,对α/β的亲和力更高。模拟表明氢键是导致GABAA受体亚基界面内丙泊