Acta Chimica Sinica ›› 2023, Vol. 81 ›› Issue (12): 1673-1680.DOI: 10.6023/A23050263 Previous Articles     Next Articles

Special Issue: 庆祝《化学学报》创刊90周年合辑

Article

基于可断裂双功能探针的糖蛋白分析

李畅, 郑振东, 郑江南*(), 田瑞军*()   

  1. 南方科技大学理学院化学系 深圳 518055
  • 投稿日期:2023-06-01 发布日期:2023-08-14
  • 作者简介:
    ★庆祝《化学学报》创刊90周年.
  • 基金资助:
    项目受国家重点研发计划(2021YFA1302603); 项目受国家重点研发计划(2020YFE0202200); 国家自然科学基金(22125403); 国家自然科学基金(92253304); 国家自然科学基金(32201218); 深圳市科技创新委员会(JCYJ20200109141212325); 深圳市科技创新委员会(JCYJ20210324120210029); 深圳市科技创新委员会(JCYJ20200109140814408); 广东省杰出青年基金(2019B151502050)

Glycoprotein Identification using Cleavable Bifunctional Probes

Chang Li, Zhendong Zheng, Jiangnan Zheng(), Ruijun Tian()   

  1. Department of Chemistry, School of Science, Southern University of Science and Technology, Shenzhen 518055
  • Received:2023-06-01 Published:2023-08-14
  • Contact: *E-mail: zhengjn@sustech.edu.cn;tianrj@sustech.edu.cn
  • About author:
    ★Dedicated to the 90th anniversary of Acta Chimica Sinica.
  • Supported by:
    National Key R&D Program of China(2021YFA1302603); National Key R&D Program of China(2020YFE0202200); National Natural Science Foundation of China(22125403); National Natural Science Foundation of China(92253304); National Natural Science Foundation of China(32201218); Shenzhen Innovation of Science and Technology Commission(JCYJ20200109141212325); Shenzhen Innovation of Science and Technology Commission(JCYJ20210324120210029); Shenzhen Innovation of Science and Technology Commission(JCYJ20200109140814408); Guangdong Provincial Fund for Distinguished Young Scholars(2019B151502050)

Glycoproteins play important roles in cellular activities and disease development. However, the abundance of glycoproteins is often low in complex biological samples. Thus, it is critical to enrich glycoproteins to achieve highly sensitive mass spectrometry (MS) analysis result. Many methods have been developed to enrich glycoproteins, among which hydrazide chemistry and oxime click chemistry have received increasing attention because of their universality and unbiasedness for labelling glycoproteins. Glycoproteins are captured by covalent binding or high affinity biotin binding on beads in these methods. Therefore, it is difficult to release glycoproteins from beads. Conventional way such as on-bead digestion is too harsh that can co-elute non-specifically bound proteins, endogenously biotinylated proteins and streptavidin on beads. These contaminant proteins would cause background interference in the subsequent glycoprotein identification by MS. In this study, three kinds of cleavable bifunctional probes named Biotin-Azo-Aminooxy (BAA), Biotin-Dde-Aminooxy (BDA) and Biotin-Nbz-Aminooxy (BNA) have been designed and synthesized. The cleavable bifunctional probes allow the release of glycoproteins from beads under mild condition. The mild condition can separate labelled glycoproteins from contaminant proteins to exclude the interference of non-glycoproteins. We evaluated the labelling and enrichment conditions, cleavage efficiency, glycoprotein recovery of these probes. The result showed that the properties of BDA and BNA are excellent. Lastly, BNA was selected to analyze cell surface glycoproteins by MS. Compared with the traditional method of on-bead digestion, the number of non-glycoproteins in this method decreased from 3564 to 2139 by 40.0% and the total Label-free quantitative (LFQ) intensity of glycoproteins increased by 104.2%. Furthermore, the endogenously biotinylated proteins were greatly reduced in cleavage method. The result shows that cleavable bifunctional probes can significantly improve the sensitivity and selectivity of the cell surface glycoprotein identification by MS, which provide tools for deep profiling of glycoproteins in the field of biology and medicine.

Key words: glycoprotein, mass spectrometry, enrichment, oxime click chemistry, cleavable probes