Synthesis and antitumor activity of cyclic octapeptide, samoamide A, and its derivatives
作者:Fei Ge、Chi Zhang、Longbao Zhu、Wanzhen Li、Ping Song、Yugui Tao、Guocheng Du
DOI:10.1007/s00044-019-02333-5
日期:2019.5
Using samoamide A as a lead compound, eight cyclic octapeptide samoamide A derivatives (a, b, c, d, e, f, g, and h) were designed and synthesized using the alanine scanning method. The molecular weight and chemical structure of these derivatives were verified by ESI-MS and NMR, and the antitumor activity of the derivatives was analyzed. The antitumor activity of compound f was similar to that of samoamide
使用2-氯-三苯甲基氯树脂作为固相载体,通过Fmoc固相合成然后液相环化来合成线性肽。在通过高效液相色谱法(HPLC)分离和纯化之后,制备了环状八肽氨酰胺A。合成产率为54.5%。通过电喷雾电离质谱(ESI-MS)和核磁共振波谱(NMR)表征了环八肽氨酰胺A的结构。通过CCK-8测定法和DPP4酶活性抑制测定法评价生物学活性。该化合物显示出高的抗肿瘤活性。以samoamide A作为前导化合物,设计并使用丙氨酸扫描法合成了八种环状八肽samoamide A衍生物(a,b,c,d,e,f,g和h)。通过ESI-MS和NMR验证了这些衍生物的分子量和化学结构,并分析了这些衍生物的抗肿瘤活性。化合物f的抗肿瘤活性与samoamide A相似,其替代位点是samoamide A的非活性位点,为进一步修饰和转化samoamide A提供了理论依据。