文献类型：期刊文献

英文题名：Core-shell magnetic bimetallic MOF material for synergistic enrichment of phosphopeptides

作者：Cao, Licheng[1];Zhao, Yameng[2];Chu, Zhanying[2];Zhang, Xiangmin[1];Zhang, Weibing[2]

机构：[1]Fudan Univ, Dept Chem, Shanghai 200433, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai Key Lab Funct Mat Chem, Shanghai, Peoples R China

年份：2020

卷号：206

外文期刊名：TALANTA

收录：;EI(收录号：20193207294057);WOS:【SCI-EXPANDED(收录号:WOS:000488416200053)】；

基金：We gratefully acknowledged the support of the National Natural Science Foundation of China (No.21475044), the National Key Technology R&D Program (2015BAK44B00), the Fundamental Research Funds for the Central Universities (222201817022), the National Natural Science Foundation of China (No.51472121). and the China State Key Research Grant (No.2016YFA0501402).

语种：英文

外文关键词：Metal organic framework; Phosphorylated peptides; Mass spectrum; Immobilized metal ion affinity chromatography

摘要：In proteomics, phosphorylation is an important process for protein post-translational modification (PTM), which greatly improves the diversity of proteomes. The PTM regulates almost all physiological and pathological processes such as signal transduction, cell division, proliferation, differentiation and metabolism. The abnormal expression of protein phosphorylation is also associated with cellular metabolic disorders and a range of diseases. However, in mass spectrometry-based phosphorylated peptideomics studies, phosphorylated peptide signals were inhibited by a high abundance of non-phosphorylated peptides; thus, highly selective enrichment was required. In this study, a newly designed material named Fe3O4@MIL(Fe/Ti) was synthesized using a layer-by-layer self-assembly technique that coats the surface of magnetic oxide nanospheres with bimetallic MOF of iron and titanium. The synergistic synthetic coating of the bimetallic MOF gives the material a large surface area and excellent hydrophilicity, which endow the nanoparticles with excellent phosphopeptide enrichment ability, high selectivity (beta-casein/BSA molar ratio 1:500), a low detection limit (3 fmol), high recovery rate (85%), strong binding capacity, size exclusion ability, and ideal batch-to-batch repeatability. For comparison, we used Fe3O4@MIL(Fe/Ti) and two single-metal MOF materials Fe3O4@MIL-100(Fe) and Fe3O4@MIL-125(Ti), to enrich alpha-casein in the middle. Thus, the iron-titanium bimetallic MOF can not only enrich all the phosphorylated peptides enriched by Fe3O4@MIL-100(Fe) and (Fe3O4MIL)-M-@-125(Ti), but can also specifically enrich four phosphorylated peptides. Encouraged by the excellent results of characterization and standard protein enrichment, we used this material to analyze human serum and found that bimetallic materials can effectively enrich all four phosphorylated peptides and exclude high molecular proteins. These experimental results indicate that the novel bimetallic MOF is a good candidate to analyze protein phosphorylation in complex samples.