基于MALDI-TOF MS的串联富集策略在磷酸化蛋白组学中的应用

提出一种除盐-富集串联用于磷酸肽富集研究的思路。选用C18柱和铈(Ⅳ)修饰的壳聚糖材料进行脱盐实验,以制备的基于聚合物基体螯合Fe3+的亲和色谱材料为富集材料。将直接富集和串联策略应用到标准品和血清中,研究结果表明,该富集材料具有高选择性和高灵敏度(1.6 fmol),铈(Ⅳ)修饰的壳聚糖材料前提下的串联策略能明显降低样品的复杂性。相比直接富集方法,能够提高磷酸化肽的覆盖率。

Application of Tandem Enrichment Strategy by MALDI-TOF MS in Phosphorylated Proteomics

A scheme was presented for the tandem purification of phosphopeptide using desalting prior to immobilized metal ion affinity chromatography(IMAC).Both C18 tip and the cerium (Ⅳ)-modified chitosan material(Ce-MCM) were used in the desalting experiments.GMA-co-SR454/Iron (Ⅲ)-IDA was synthesized,and used as an excellent phosphopetides enrichment material.They were applied to selectively capture the phosphopeptides in standards and human serum.Results demonstrated that C18/IMAC and Ce-MCM/IMAC have different performances because of their hydrophobic or hydrophilic properties.Ce-MCM/IMAC tandem strategy notably decreased the complexity of peptides,and yielded a far greater coverage for phosphopeptides than single IMAC.