Cyclic RGD Peptidomimetics Containing Bifunctional Diketopiperazine Scaffolds as New Potent Integrin Ligands
作者:Mattia Marchini、Michele Mingozzi、Raffaele Colombo、Ileana Guzzetti、Laura Belvisi、Francesca Vasile、Donatella Potenza、Umberto Piarulli、Daniela Arosio、Cesare Gennari
DOI:10.1002/chem.201200457
日期:2012.5.14
introduced into eight cyclic peptidomimetics containing the Arg‐Gly‐Asp (RGD) sequence. The resulting RGD peptidomimetics were screened for their ability to inhibit biotinylated vitronectin binding to the purified integrins αvβ3 and αvβ5, which are involved in tumor angiogenesis. Nanomolar IC50 values were obtained for the RGD peptidomimetics derived from trans DKP scaffolds (DKP‐2–DKP‐8). Conformational
描述了八个双功能二酮哌嗪(DKP)支架的合成。它们正式衍生自2,3-二氨基丙酸和天冬氨酸(DKP - 1 – DKP - 7)或谷氨酸(DKP - 8),具有胺和羧酸官能团。支架在两个立体中心的构型和在二酮哌嗪氮原子上的取代不同。将双功能二酮哌嗪引入了八个具有Arg-Gly-Asp(RGD)序列的环状拟肽中。将所得的肽模拟RGD筛选的能力抑制生物素化的玻连蛋白结合到纯化的整α v β3和α v β 5,其参与肿瘤血管生成。从反式DKP支架(DKP ‐ 2 – DKP ‐ 8)衍生的RGD拟肽获得了纳摩尔IC 50值。通过水溶液中的1 H NMR光谱实验(VT-NMR和NOESY光谱)和Monte Carlo /随机动力学(MC / SD)模拟对环状RGD拟肽进行构象研究,结果表明,亲和力最高的配体具有分子内明确定义的优选构象氢键转弯基序和RGD序列的扩展排列[Cβ(Arg)Cβ(Asp)平均距离≥8