Template-constrained cyclic peptide analogues of somatostatin: subtype-selective binding to somatostatin receptors and antiangiogenic activity
作者:Daniel J Suich、Shaker A Mousa、Gurke Singh、George Liapakis、Terry Reisine、William F DeGrado
DOI:10.1016/s0968-0896(00)00135-8
日期:2000.9
of holding the bioactive tetrapeptide sequence of somatostatin analogues in a beta-turn conformation, as measured by somatostatin receptor (SSTR) binding. Template-constrained cyclic peptides in which the ends of the -Tyr-D-Trp-Lys-Val-tetrapeptide were linked by scaffolds based on either an N,N'-dimethyl-N,N'-diphenylurea or a substituted biphenyl system (DJS631 and DJS811, respectively), bound selectively
β-转角是蛋白质中常见的二级结构基序,在蛋白质折叠和稳定性中起作用,并参与分子识别相互作用。生长抑素是一种具有多种治疗性生物学活性的肽激素,其生物活性构象中包含一个β角。生长抑素的β-转角和生物学活性已成功地模拟成环六肽类似物。通过生长抑素受体(SSTR)结合测量,开发了两个新颖的,结构化的非肽分子,它们能够将生长抑素类似物的生物活性四肽序列保持在β转角构象中。模板受限的环肽,其中-Tyr-D-Trp-Lys-Val-四肽的末端通过基于N,N'-二甲基-N,N'的支架连接 -二苯基脲或取代的联苯系统(分别为DJS631和DJS811),以高达1 nM的亲和力与小鼠SSTR2B以及大鼠和人SSTR5选择性结合。在小鼠Matrigel模型中显示剂量为3 mg / kg /天的DJS811可抑制血管生成至79%的水平。结构化转向支架的发展使得β-转向序列可以被包含在紧凑的结构中,与环六肽相比,肽