Structure-activity relationships of cyclic opioid peptide analogs containing a phenylalanine residue in the 3-position
作者:Peter W. Schiller、Louise A. Maziak、Brian C. Wilkes、Carole Lemieux、Nguyen Thi Mai Dung
DOI:10.1021/jm00394a027
日期:1987.11
Ten analogues of the highly mu-receptor selective cyclic opioid peptide H-Tyr-D-Orn-Phe-Asp-NH2 (1) were synthesized by the solid phase method and were characterized in vitro in mu- and delta-receptor representative binding assays and bioassays. These cyclic analogues are structurally related to the linear opioid peptides dermorphin and beta-casomorphin (morphiceptin), which also contain a phenylalanine
通过固相法合成了十种高度mu受体选择性环状阿片肽H-Tyr-D-Orn-Phe-Asp-NH2(1)的类似物,并在体外以mu和delta受体代表结合试验进行了表征和生物测定。这些环状类似物在结构上与线性阿片肽dermorphin和β-casomorphin(吗啡肽)有关,后者在肽序列的3位还含有苯丙氨酸残基。获得的结果表明,在环状肽1和与吗啡相关的肽中,类似的结构修饰(Phe3的2、3和4位或N alpha甲基化的构型反转)对阿片类药物活性的定性影响相同,而相应的修饰在β-casomorphins中有相反的作用。这些发现可以解释为表明H-Tyr-D-Orn-Phe-Asp-NH2的受体结合方式与dermorphin相同,但不同于β-casomorphins。已显示环状类似物1的3位芳香族残基的侧链长度对于受体亲和力和选择性至关重要,这表明mu和delta受体在结合位点的相对拓扑结构上彼此不同。