alpha-MSH. The analogue Ac-Cys4-Asp5-His6-DPhe7-Arg8-Trp9-Lys10-Cys11 -NH2 also was synthesized, and its conformational and biological properties were examined. Design of these analogues was based upon the previously identified superpotent monocyclic peptides [Cys4,DPhe7,Cys10]alpha-MSH(4-10)-NH2 and [Nle4,Asp5,DPhe7,Lys10]alpha-MSH(4-10)-NH2 with the rationale of increasing conformational constraints
设计并合成了七个侧链约束的双环α-黑素蛋白(alpha-MSH)类似物,对其构象进行了分析,并在蛙皮和蜥蜴皮
生物测定中检查了它们的
生物学特性。这些类似物的结构基于中心序列Ac-Cys4-Xaa5-His6-DPhe7-Arg8-Trp9-Cys10-Lys11 -NH2(Xaa5 = Asp或Glu),并已在N端扩展了
氨基酸Ser1-Tyr2-Ser3和Pro12-Val13的C端与天然激素α-MSH更相似。还合成了类似物Ac-Cys4-Asp5-His6-DPhe7-Arg8-Trp9-Lys10-Cys11 -NH2,并检查了其构象和
生物学特性。这些类似物的设计基于先前确定的超强单环肽[Cys4,DPhe7,Cys10] alpha-MSH(4-10)-NH2和[Nle4,Asp5,DPhe7,Lys10] alpha-MSH(4-10)-NH2,其理由是增加构象限制,以限制可用的骨架