(a δ ligand). The affinity of analogs containing (R) or (S)‐α‐benzyl‐β‐azidoalanine in position 3 to δ‐receptors strongly depended on the chirality of the α,α‐disubstituted residue. The conformational behavior of peptides modified with (R) or (S)‐α‐benzyl‐β‐(1‐piperidinyl)Ala, which displays the opposite selectivity, was analyzed by 1H and 13C NMR. The μ‐selective Tyr‐d‐Ala‐(R)‐α‐benzyl‐β‐(1‐piper
本文介绍新的δ
啡肽Ⅰ类似物,其中苯丙
氨酸残基被相应的(取代- [R )或(小号) - α -苄基- β -azidoalanine,α -苄基- β - (1-
吡咯烷基)丙
氨酸,α -苄基- β -(1-
哌啶基)丙
氨酸和α-苄基-β-(4-吗啉基)-丙
氨酸残基。使用[ 3 H]
DAMGO(一种μ
配体)和[ 3 H] DELT(一种δ
配体),通过竞争性受体结合试验在大鼠大脑中评估了新类似物的效价和选择性。含有(R)或(S)-α-苄基-β-
叠氮丙
氨酸位于δ-受体的3位,强烈依赖于α,α-二取代残基的手性。通过1 H和13 C NMR分析了具有相反选择性的,经(R)或(S)-α-苄基-β-(1-
哌啶基)Ala修饰的肽的构象行为。的μ -选择性Tyr- d -Ala-([R )- α -苄基- β - (1-
哌啶基)丙
氨酸-
天冬氨酸-缬
氨酸-缬
氨酸-甘
氨酸- NH2缺乏在δ-选择性Tyr- d-