The present invention relates to methods and intermediates for chemical synthesis of polypeptides and proteins, and more particularly to methods and intermediates for chemically ligating a peptide fragment containing N-terminal N-methyl-cysteine (SEQ ID NO: 1) with another peptide fragment having C-terminal thioester to generate a β-(methylamino)-thioester intermediate that spontaneously rearranges to form an amide bond. Furthermore, the invention relates to methods of converting N-methyl-thiazolidine to N-methyl-cysteine (SEQ ID NO: 1) of polypeptides and proteins. The invention also relates to methods of synthesizing peptide-thioester from peptide-acid fluoride.
本发明涉及用于合成
多肽和蛋白质的
化学合成方法和中间体,更具体地,涉及用于
化学连接含有N-甲基半胱
氨酸(
SEQ ID NO:1)N-末端的肽片段与具有C-末端
硫酸酯的另一个肽片段以生成β-(甲
氨基)-
硫酸酯中间体的方法和中间体,该中间体会自发重排形成酰胺键。此外,本发明还涉及将N-甲基
噻唑啉转化为
多肽和蛋白质中的N-甲基半胱
氨酸(
SEQ ID NO:1)的方法。本发明还涉及从肽酸
氟合成肽
硫酸酯的方法。