Provided is a method for characterising a polypeptide or a population of polypeptides, which method comprises the steps of: (a) contacting a sample comprising one or more polypeptides with a lysine reactive agent to cap ε-amino groups; (b) optionally reacting the sample of polypeptides with an amine reactive reagent to block α-amino groups; (c) digesting the sample of polypeptides with a cleavage reagent to produce peptide fragments; (d) optionally deactivating the cleavage reagent; (e) removing those peptides having uncapped or unblocked amino groups; and (f) recovering the N-terminal peptides.
提供了一种表征
多肽或
多肽群体的方法,该方法包括以下步骤:(a)将包含一个或多个
多肽的样品与赖
氨酸反应性试剂接触以盖住ε-
氨基团;(b)可选择性地将
多肽样品与胺反应性试剂反应以阻断α-
氨基团;(c)用裂解试剂消化
多肽样品以产生肽片段;(d)可选择性地去活化裂解试剂;(e)去除那些具有未盖住或未阻断
氨基团的肽;(f)回收N-末端肽。