Novel methods of native chemical ligation are provided. The methods involve reacting a thioacid (e.g. a peptide thioacid) with an aziridinyl compound (e.g. an aziridinyl peptide) or glycosylamine under mild conditions without the use of protecting groups, and without requiring that a cysteine residue be present in the ligation product. Initial coupling of the thioacid and the aziridinyl compound yields a ligation product containing an aziridinyl ring. Optional subsequent opening of the aziridinyl ring (e.g. via a nucleophilic attack) produces a linearized and modified ligation product. Coupling of a peptide thioacid and glycosylamine yields a glycosylated peptide.
提供一种原生
化学连接的新方法。该方法涉及在温和条件下反应
硫代酸(例如肽
硫代酸)与环氧
丙烷化合物(例如环氧
丙烷肽)或者
葡萄糖氨基化合物,无需使用保护基,并且不需要在连接产物中存在半胱
氨酸残基。
硫代酸和环氧
丙烷化合物的初始偶联产生含有环氧
丙烷环的连接产物。选择性地通过环氧
丙烷环的后续开放(例如通过亲核攻击)可产生线性化和改性的连接产物。肽
硫代酸和
葡萄糖氨基化合物的偶联产生糖基化肽。