The invention provides a reagent comprising an affinity tag, a detectable moiety, a linker, an isotope tag and a reactive group. The invention also provides methods of using a reagent of the invention. The methods can be used to label a polypeptide in a sample by contacting a sample with a reagent of the invention under conditions allowing the reactive group to bind to one or more polypeptides in the sample. The invention additionally provides methods of isolating, identifying and quantifying a polypeptide in a sample. The invention further provides methods of diagnosing a disease using a reagent of the invention.
本发明提供了一种试剂,该试剂由亲和性标签、可检测分子、连接体、同位素标签和反应基团组成。本发明还提供了使用本发明试剂的方法。在允许反应基团与样品中的一个或多个
多肽结合的条件下,将样品与本发明的试剂接触,即可使用这些方法标记样品中的
多肽。本发明还提供了分离、鉴定和量化样品中
多肽的方法。本发明进一步提供了使用本发明试剂诊断疾病的方法。