Comparative studies of proteins from two or more cell populations are performed by alkylating the cysteine thiol groups of the proteins of all populations with vinyl pyridines in which the pyridine ring in at least one of the populations, in addition to the vinyl substituent, bears one or more alkyl substituents, the various populations thus differing in the alkyl substituents on the pyridine ring. Proteins of one population are thus alkylated with vinyl pyridine itself and those of another population with an alkyl-substituted vinyl pyridine, or both with alkyl-substituted vinyl pyridines using different alkyl groups or a different number of alkyl groups. The mass differential afforded by the difference in alkyl substitution affords a means of pairing individual proteins of one population with those of another while differentiating between the two, using analytical techniques disclosed in the prior art for isotope-coded affinity tagging.
对来自两个或多个细胞群的蛋白质进行比较研究,方法是用
乙烯基吡啶将所有细胞群蛋白质的半胱
氨酸
硫醇基团烷基化,其中至少一个细胞群的
吡啶环除了
乙烯基取代基外,还带有一个或多个烷基取代基,因此不同细胞群在
吡啶环上的烷基取代基是不同的。因此,一个群体的蛋白质用
乙烯基吡啶本身进行烷基化,而另一个群体的蛋白质则用烷基取代的
乙烯基吡啶进行烷基化,或两者都用不同的烷基或不同数目的烷基取代的
乙烯基吡啶进行烷基化。烷基取代度的不同所带来的质量差异提供了一种方法,利用现有技术中公开的同位素编码亲和标记分析技术,将一个群体中的单个蛋白质与另一个群体中的单个蛋白质配对,同时将两者区分开来。