Substitution on the Phe3 aromatic ring in cyclic .delta. opioid receptor-selective dermorphin/deltorphin tetrapeptide analogs: electronic and lipophilic requirements for receptor affinity
作者:Deborah L. Heyl、Henry I. Mosberg
DOI:10.1021/jm00087a006
日期:1992.5
receptor recognition in a series of conformationally restricted tetrapeptides related to the cyclic, delta opioid receptor-selective analogue, [formula: see text] electronic, lipophilic, and steric effects at the Phe3 residue were assessed by substitution at different positions of the side-chain aromatic ring by halogens, alkyl, hydroxyl, and nitro groups. Effects on opioid receptor binding affinity
为了探索影响与环状,δ阿片受体选择性类似物有关的一系列构象受限的四肽中影响受体识别的结构特征,通过取代评估了对Phe3残基的电子,亲脂和空间效应在侧链芳环的不同位置上的卤素,烷基,羟基和硝基。确定了对阿片样物质受体结合亲和力和选择性的影响。该结果通常与线性和环状五肽脑啡肽的类似修饰的报道一致,表明空间,亲脂性和电子性质都是δ阿片受体识别的重要决定因素。特别,增加亲脂性或对芳环施加吸电子作用的修饰增强结合亲和力,而亲水,庞大或释放电子的修饰是有害的。这些观察结果与线性阿片类五肽脑啡肽类似物中Phe4修饰的定量构效关系(QSAR)结果非常吻合,表明Phe3四肽侧链和Phe4五肽侧链与相同的δ受体结合亚位相互作用。