Chiral Recognition of Flexible Melatonin Receptor Ligands Induced by Conformational Equilibria
作者:Gian Marco Elisi、Annalida Bedini、Laura Scalvini、Caterina Carmi、Silvia Bartolucci、Valeria Lucini、Francesco Scaglione、Marco Mor、Silvia Rivara、Gilberto Spadoni
DOI:10.3390/molecules25184057
日期:——
nitrogen and conformational equilibria were investigated by NMR spectroscopy and molecular dynamics simulations. Receptor affinity was conserved only for the beta-methyl derivative, which also showed significant stereoselectivity, with the (S) enantiomer being the eutomer. Molecular dynamics simulations, validated by NMR spectroscopy, showed that the beta-methyl group affects the conformational preferences
N-苯胺基乙酰胺是一类褪黑激素能药物,其苯胺部分模仿天然配体的吲哚环,乙酰胺链再现褪黑激素的吲哚环。此类中最简单的化合物 N-2-[(3-甲氧基苯基) 甲基氨基]乙基}乙酰胺 (UCM793),对 MT1 和 MT2 膜受体具有纳摩尔的结合亲和力。为了探索链构象对受体结合的影响,将甲基插入到酰胺氮的亚甲基 α 或 β 上,并通过 NMR 光谱和分子动力学模拟研究了构象平衡。受体亲和力仅对 β-甲基衍生物是保守的,它也显示出显着的立体选择性,其中 (S) 对映异构体是 eutomer。分子动力学模拟,经核磁共振波谱验证,表明β-甲基影响乙酰胺链的构象偏好。对接受体晶体结构为观察到的手性识别提供了基本原理,表明 (S)-β-甲基有利于更适合受体结合位点的构象。