Novel Asp32-Replacement Tetrapeptide Analogs as Potent and Selective CCK-A Agonists
作者:Richard L. Elliott、Hana Kopecka、Michael D. Tufano、Youe-Kong Shue、Andre J. Gauri、Chun-Wel Lin、Bruce R. Bianchi、Thomas R. Miller、David G. Witte
DOI:10.1021/jm00037a005
日期:1994.5
penultimate position, demonstrated surprisingly high CCK-A receptor affinity and selectivity. The effect of N-methylation pattern on CCK-A receptor affinity showed consistent trends for analogues in which n = 1, 2, or 3, with the di-N-methylated analogues having the highest affinity in each case. However, none of these analogues had full agonist activity, as measured by percent maximal PI hydrolysis
一系列通式为Boc-Trp-Lys(Tac)-N(R)-(CH2)nCON(R')Phe-NH2的新颖CCK四肽类似物(Tac =邻甲苯基氨基羰基),其中R,R'= H或Me且n = 1-5,已经合成和测试。这些类似物在倒数第二个位置缺少酸性残基,显示出令人惊讶的高CCK-A受体亲和力和选择性。N-甲基化模式对CCK-A受体亲和力的影响显示出对n = 1、2或3的类似物的一致趋势,其中二-N-甲基化类似物在每种情况下均具有最高亲和力。然而,通过最大PI水解百分数测量,这些类似物均不具有完全的激动剂活性。两种受构象限制的类似物也显示出高CCK-A受体亲和力和选择性,以及几乎最大的激动剂活性。此外,