Biotin-S-S-Phosphine was designed and synthesized as a potential tool for a proteomic study of O-GlcNAcmodified proteins. This reagent features a disulfide linker between a triarylphosphine moiety, which allows selective conjugation to azide-containing proteins, and a biotin moiety that can allow easy isolation through its strong affinity toward avidin-coated solid beads. The disulfide linkage within this reagent can allow the easy release of the bound molecules of interest, which is difficult to achieve when a biotin:avidin pair is used alone, by reducing the disulfide bond of the reagent with DTT. Preliminary in vitro biological assays with azidelabeled and unlabeled cell lysates and a pure protein Nup62 showed that the Biotin-S-S-Phosphine reagent is highly reactive toward the free thiol groups of proteins. When a molecular tool with a disulfide linker is applied to the enrichment of the molecules of interest from other species, it is important to block the free-thiols of the sample using exhaustive alkylation prior to the Staudinger ligation reactions to restore the bioorthogonal nature of this reaction.
生物素-S-S-膦化物被设计和合成,作为一种潜在的工具,用于研究O-GlcNAc修饰蛋白的蛋白质组学研究。该试剂的特点是通过二
硫键连接的三芳基膦部分,允许选择性地与含
叠氮的蛋白质结合,以及一个
生物素部分,可以通过其对亲和素包被的固态珠子的强亲和性,实现轻松的分离。该试剂中的二
硫键可以使得容易释放所结合的感兴趣的分子,这在单独使用
生物素:亲和素对时难以实现,通过使用D
TT还原试剂的二
硫键。初步的体外
生物学测定与带有和不带
叠氮标记的细胞裂解物以及纯蛋白质Nup62一起进行,结果显示
生物素-S-S-膦化物试剂对蛋白质的自由巯基具有高度反应性。当具有二
硫键连接的分子工具应用于从其他物种中富集感兴趣的分子时,重要的是在使用StAUDinger连接反应之前使用彻底的烷基化阻断样品的自由巯基,以恢复该反应的
生物正交性质。