Synthesis and Evaluation of <i>N</i>,<i>N</i>-Dialkyl Enkephalin-Based Affinity Labels for δ Opioid Receptors
作者:Dean Y. Maeda、Jane E. Ishmael、Thomas F. Murray、Jane V. Aldrich
DOI:10.1021/jm000123u
日期:2000.10.1
inhibition of radioligand binding to delta receptors. To our knowledge, 2 represents the first peptide-based affinity label to utilize an isothiocyanate group as the electrophilic affinity labeling moiety. As a result of this study, enkephalin analogue 2 emerges as a potential affinity label useful for the further study of delta opioid receptors.
要开发基于肽拮抗剂的δ阿片受体的亲和标记,N,N-二苄基亮氨酸脑啡肽和N,N-二烯丙基[Aib(2),Aib(3)]亮氨酸脑啡肽的Phe(4)残基(ICI-174, 864)替换为Phe(p-NCS)或Phe(p-NHCOCH(2)Br)。开发了一种通用的合成方法,用于将小肽底物转化为潜在的亲和标记。使用Phe(p-NH(2))和Boc / Fmoc正交保护策略合成靶肽,该策略可将肽中的p-胺基团后期官能团转化为所需的亲和标记部分。合成中的关键步骤是使用三甲基甲硅烷基三氟甲磺酸酯(TMS-OTf)在叔丁酯存在下对Boc基团进行选择性脱保护。在表达δ或μ阿片受体的中国仓鼠卵巢(CHO)细胞中,通过放射性配体结合实验评估了目标肽。N,N-二苄基亮氨酸脑啡肽类似物的δ受体亲和力比相应的ICI-174,864类似物的亲和力高2.5-10倍。通常,在标准放射性配体结合测定中,在Phe(4)对位的取代