A sequencing method which exploits the thioacylation degradation of polypeptides and proteins is disclosed. The process involves reaction of the N-terminal amino acid of a polypeptide with an excess of a thioacylating reagent. After sufficient time to insure quantitative coupling and removal of excess reagent, the N-thioacyl polypeptide is subjected to cleavage by acid which affords a 2-substituted-5(4H)-thiazolinone of the N-terminal amino acid. Subsequent addition of a large excess of an aliphatic primary or secondary alcohol, either directly to the cleavage acid or after its removal, yields the corresponding N-thioacyl amino acid ester, a stable compound suitable for chromatographic separation and subsequent detection by contemporary methods of high pressure liquid chromatography.
本发明揭示了一种利用
多肽和蛋白质的
硫酰基降解的测序方法。该过程涉及将
多肽的N-末端
氨基酸与过量的
硫酰基化试剂反应。经过足够的时间以确保定量偶联和去除过量试剂后,将N-
硫酰基
多肽经酸解裂,得到N-末端
氨基酸的2-取代-5(4H)-
噻唑酮。随后,向裂解酸中直接或在其去除后加入大量的脂肪族一次或二次醇,得到相应的N-
硫酰基
氨基酸酯,这是一种稳定的化合物,适用于色谱分离和随后通过高压
液相色谱的现代检测方法检测。