Design of a new peptidomimetic agonist for the melanocortin receptors based on the solution structure of the peptide ligand, Ac-Nle-cyclo[Asp-Pro-dPhe-Arg-Trp-Lys]-NH2
作者:Christopher Fotsch、Duncan M Smith、Jeffrey A Adams、Janet Cheetham、Michael Croghan、Elizabeth M Doherty、Clarence Hale、Mark A Jarosinski、Michael G Kelly、Mark H Norman、Nuria A Tamayo、Ning Xi、James W Baumgartner
DOI:10.1016/s0960-894x(03)00412-8
日期:2003.7
The solution structure of a potent melanocortin receptor agonist, Ac-Nle-cyclo[Asp-Pro-DPhe-Arg-Trp-Lys]-NH(2) (1) was calculated using distance restraints determined from 1H NMR spectroscopy. Eight of the lowest energy conformations from this study were used to identify non-peptide cores that mimic the spatial arrangement of the critical tripeptide region, DPhe-Arg-Trp, found in 1. From these studies
使用从1H NMR光谱确定的距离限制来计算有效的黑皮质素受体激动剂Ac-Nle-环[Asp-Pro-DPhe-Arg-Trp-Lys] -NH(2)(1)的溶液结构。使用这项研究中最低的八个能量构象,来鉴定出模拟1中发现的关键三肽区DPhe-Arg-Trp的空间排列的非肽核。从这些研究中,化合物2a包含顺式-环己基核心,被确定为黑皮质素4受体(MC4R)的功能激动剂,IC(50)和EC(50)低于10 nM。在结合试验中,化合物2a的选择性也分别比MC3R和MC1R高36倍和7倍。环己烷立体化学的细微变化和官能团的去除导致对MC受体的亲和力较低的类似物。