Novel 3D Pharmacophore of α-MSH/γ-MSH Hybrids Leads to Selective Human MC1R and MC3R Analogues
作者:Minying Cai、Alexander V. Mayorov、Christopher Cabello、Magda Stankova、Dev Trivedi、Victor J. Hruby
DOI:10.1021/jm049579s
日期:2005.3.1
d-Phe(6) in gamma-MSH-NH(2) forms a selective antagonist for the hMC3R, whereas, substitution of Phe(6) with d-Nal(2')(6) and replacing Trp(8) with d-Trp(8) at gamma-MSH-NH(2) yields a selective partial agonist for the hMC1R. Finally, substitution of His(5) with Pro(5) and Trp(8) with d-Nal(2')(8) in gamma-MSH-NH(2) leads to a highly potent and selective agonist for the hMC1R. Molecular modeling showed
为了进一步评估可能有助于gamma-MSH的3D地形结构的元素,我们系统地设计了一组线性gamma-MSH类似物并评估了它们的生物学活性:没有N末端乙酰基,有和没有C末端酰胺,Nle(3),l-或d-Phe(6)或d-Nal(2')(6),以及d-Trp(8)或d-Nal(2')(8)。发现将γ-MSH中的C末端酸改变为酰胺并用Nle取代Met会导致黑皮质素受体的所有四个亚型的结合亲和力增加(10-100倍)。在γ-MSH-NH(2)中用d-Nal(2')(8)取代Trp(8)和用d-Phe(6)取代Phe(6)形成hMC3R的选择性拮抗剂,而取代带有d-Nal(2')(6)的Phe(6),并在γ-MSH-NH(2)上用d-Trp(8)替换Trp(8),从而为hMC1R产生选择性部分激动剂。最后,用γ-MSH-NH(2)中的d-Nal(2')(8)将Pro(5)替换为His(5),将Trp