Design and synthesis of plant cyclopeptide Astin C analogues and investigation of their immunosuppressive activity
作者:Fei Li、Xi-Xi Guo、Guang-Zhi Zeng、Wei-Wei Qin、Bo Zhang、Ning-Hua Tan
DOI:10.1016/j.bmcl.2018.05.050
日期:2018.8
Astin C analogues containing D-amino acid residues, hydrophobic long-chain alkyl substituents, and aryl substituents performed better than those carrying hydrophilic amino acid residues and short-chain alkyl substituents. Moreover compounds 15, 16, and 17 had no immunosuppressive activity, which suggested that cis-3,4-dichlorinated proline played an important role in the immunosuppressive activity of Astin
对免疫抑制阿斯廷C的结构-活性关系进一步调查,17个类似物1 - 17设计并synthetized经由通过首次固相肽合成方法的氨基酸取代的策略。与Astin C(IC 50 = 12.6±3.3μM)相比,仅化合物2(IC 50 = 38.4±16.2μM),4(IC 50 = 51.8±12.7μM),5(IC 50 = 65.2±15.6μM),和8(IC 50 = 61.8±12.4μM)在小鼠的淋巴结细胞中表现出免疫抑制活性。这些结果表明,含有D-氨基酸残基,疏水性长链烷基取代基和芳基取代基的Astin C类似物的性能优于带有亲水性氨基酸残基和短链烷基取代基的那些。此外化合物15,16和17没有免疫抑制活性,这表明顺式-3,4-二氯代脯氨酸阿斯廷C的免疫抑制活性中起重要作用