negative to positive. This reverse polarity protection significantly increased the isoelectric point of the peptide segment and made it positive under acidic conditions and facilitated the purification. An efficient method to prepare the prolyl peptide thioester required for the synthesis of the (28‐65) segment was also developed. These efforts resulted in the total synthesis of the glycosylated IL‐2
据报道通过连接法
化学合成具有1糖核心的人白介素-2(I
L-2)。尽管I
L-2是一种球状糖蛋白,但通过固相法合成时,其C端区域尤其是(99-133)极难溶。为了克服这个问题,Glu残基的侧链
羧酸受到了
甲基吡啶酯的保护,从而将其极性从负转换为正。这种反极性保护作用显着增加了肽段的等电点,并使其在酸性条件下呈阳性,并促进了纯化。还开发了一种有效的方法来制备合成(28-65)片段所需的脯
氨酰肽
硫酯。这些努力导致了具有完全
生物学活性的糖基化I
L-2的全合成。