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Acta Chim. Sinica ›› 2015, Vol. 73 ›› Issue (10): 1074-1079.DOI: 10.6023/A15050370 Previous Articles    

Article

一种弱阳离子交换材料的亲水模式糖肽富集新方法

李先琴a, 俞冬萍b, 丰小敏a, 郭志谋b, 李秀玲b, 邹丽娟a, 梁鑫淼b   

  1. a 大连医科大学附属第二医院 大连 116023;
    b 中国科学院大连化学物理研究所 中国科学院分离分析化学重点实验室 大连 116023
  • 投稿日期:2015-05-29 发布日期:2015-11-19
  • 通讯作者: 邹丽娟 E-mail:zoulijuan1963@sina.com; lixiuling@dicp.ac.cn
  • 基金资助:

    项目受国家自然科学基金(Nos.81171486,21475129)、辽宁省特聘教授资助.

A Novel Glycopeptides Enrichment Method Using Weak Cation Exchange Chromatography Material under Hydrophilic Interaction Liquid Chromatography Mode

Li Xianqina, Yu Dongpingb, Feng Xiaomina, Guo Zhimoub, Li Xiulingb, Zou Lijuana, Liang Xinmiaob   

  1. a The Second Hospital Affiliated to Dalian Medical University, Dalian 116023;
    b Key Lab of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023
  • Received:2015-05-29 Published:2015-11-19
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Nos. 81171486, 21475129) and Distinguished Professor of Liaoning Province.

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Protein glycosylation is a vital bio-process in organisms. Selective enrichment of glycopeptides before mass spectrometry (MS) plays an important role in proteomics owing to the low glycopeptides proportion and the suppression effect of the non-glycosylated peptides. There are several methods used for the enrichment of glycopeptides with their own merits and drawbacks. Among them, hydrophilic interaction liquid chromatography (HILIC) is increasingly applied to glycopeptides enrichment with its promising prospects. In this paper, a new strategy for the enrichment of glycopeptides using a commercial weak cation exchange chromatography (WCX) material under HILIC mode was developed. The influence of concentration of acetonitrile (ACN) and pH value on the retention of tryptic fetuin digests on WCX were studied. Results indicated that non-glycosylated peptides on WCX micro-column were eluted prior to glycopeptides when the concentration of ACN gradually decreased. Furthermore, the hydropathy index of peptides contained in glycopeptides also affected the retention. The bigger the index was, the later the plycopeptides eluted. Meanwhile, the glycopeptides were retained more strongly at lower pH than higher pH. When using WCX to enrich glycopeptides, it was found that not only sialic acid containing glycopeptides but also neutral ones could be selectively enriched. In the enrichment of tryptic IgG digests, 25 glycopeptides were found by WCX while only 1 glycopeptides were found before enrichment. And when the tryptic fetuin digests were enriched by WCX, the glycopeptides numbers detected by MS increased to 39, in contrast to only 2 before enrichment. What's more, WCX can enrich glycopeptides even under relatively complex surrounding. 23 IgG glycopeptides and 26 fetuin glycopeptides could be enriched by WCX when they were respectively mixed with bovine serum albumin (BSA) at a molar ratio of 1:5. The results indicated that glycopeptides could be selectively enriched by WCX under HILIC mode. This is a new glycopeptides enrichment method, which expands the application of WCX and enriches the variety of HILIC material.

Key words: weak cation-exchange (WCX), glycopeptides enrichment, hydrophilic interaction liquid chromatography (HILIC), mass spectrometry