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Related Concept Videos

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Displacement phenomena in lectin affinity chromatography.

Wonryeon Cho1

  • 1Department of Chemistry, Wonkwang University , 460 Iksandae-ro, Iksan, Jeonbuk 570-749, Republic of Korea.

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|September 9, 2015
PubMed
Summary

Sample displacement chromatography (SDC) occurs in lectin affinity chromatography, where different glycoproteins bind to distinct column positions. This method reveals glycoforms with varying affinities, improving protein separation and detection.

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Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Proteomics

Background:

  • Lectin affinity chromatography (LAC) is crucial for glycoprotein analysis, particularly in cancer monitoring.
  • Reproducibility in LAC can be affected by complex separation phenomena.
  • Understanding displacement effects is key to optimizing LAC methods.

Purpose of the Study:

  • To investigate displacement phenomena in Lycopersicon esculentum lectin (LEL) affinity chromatography.
  • To assess the impact of these phenomena on the reproducibility and resolution of glycoprotein separation.
  • To develop a method for differentiating glycoproteins based on binding affinity.

Main Methods:

  • Coupling four identical LEL columns in series to create a serial affinity column set (SACS).
  • Loading human plasma proteins onto the SACS and subsequently disassembling and eluting each column individually.
  • Analyzing captured proteins using mass spectrometry after trypsin digestion and deglycosylation.

Main Results:

  • Significantly different sets of glycoproteins were captured by each column in the series, indicating sample displacement chromatography (SDC).
  • Glycoproteins were found to bind at different positions within the column train, revealing glycoforms with distinct affinities.
  • Low abundance proteins were enriched, enhancing their detectability.

Conclusions:

  • Displacement phenomena are a significant factor in heavily loaded LEL affinity chromatography.
  • SDC allows for the differentiation of glycoproteins based on binding affinity, which is not observable with single columns.
  • Careful sample loading is necessary to prevent analyte displacement and ensure reliable LAC results.