On-plate glycoproteins/glycopeptides selective enrichment and purification based on surface pattern for direct MALDI MS analysis

Analyst. 2013 May 21;138(10):3032-7. doi: 10.1039/c3an00107e.

Abstract

In this paper, a novel method has been proposed to achieve selective enrichment and purification of glycoproteins/glycopeptides on a surface patterned sample support, which consists of a hydrophobic outer layer (F-SAM) and an internal boronic acid-modified gold microspot (900 μm). Upon deposition, the sample solution is firstly concentrated in a small area by repulsion of the hydrophobic outer layer, and then the glycoproteins/glycopeptides are selectively captured through boronic acid covalently binding in the inner layer. However, the non-glycosylated proteins/peptides or high concentration salts are removed after rinsing with alkaline solution. As a result, the detection sensitivity is improved by an order of magnitude greater than when using a stainless steel MALDI plate. With surface patterned sample support, the glycoproteins/glycopeptides can be detected even under interference from the excessive existing non-glycosylated proteins/peptides (10 times more than glycoproteins/glycopeptides). Simultaneously, high-quality mass spectra can be obtained even in the presence of urea (1 M), NaCl (1 M), or NH4HCO3 (200 mM). Therefore, this novel technique may be applied to high-throughput analysis of low-abundance glycoproteins/glycopeptides in complicated proteome research.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Glycopeptides / analysis*
  • Glycoproteins / analysis*
  • High-Throughput Screening Assays
  • Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
  • Surface Properties

Substances

  • Glycopeptides
  • Glycoproteins