Glycosylation

GlycoProfile™ ß-Elimination Kit

Expect More!
The first and only way to simultaneously separate O-glycans from protein.

Now you can have your O-linked glycans and protein too!

Sigma-Aldrich's GlycoProfile Beta-Elimination Kit allows researchers to:
  • Perform complete glycoproteomics research by preserving both the
    O-glycans and protein
  • Specifically remove O-glycans
  • Label O-glycans prior to analysis
  • Have confidence in uniformity of procedure


Enabling Proteomic Analysis  |  O-glycan Analysis  |  Deglycosylation Strategies  |  Ordering Information

While it is known that O-glycosylation plays a major role in regulatory biology (as evident with studies around O-GlcNac and RNAi knockdowns of glycosyltransferases) the development of methods for the study of O-glycosylation is under represented compared to N-glycosylation.  The under representation is primarily due to the difficulty in removing O-glycans while keeping both the protein and glycans intact.  In contrast to N-glycosylation, there is no single enzyme capable of complete O-deglycosylation, so chemical methods must be employed.

Traditionally, alkaline β-elimination uses a combination of sodium hydroxide and sodium borohydride. The O-glycan linkage is easily hydrolyzed using dilute alkaline solution under mild conditions. The presence of a reducing agent can keep the glycan from "peeling" after being released, but the process significantly degrades the protein or peptide. Other methods, such as using sodium hydroxide alone or with borane-ammonia, also easily hydrolyze the linkage, but are not very efficient at keeping both moieties intact.

A novel non-reductive β-elimination kit has been developed that keeps both protein and glycan intact. The method is much easier to use than the traditional β-elimination methodologies. There is no tedious neutralization of the borohydride or ion exchange chromatography to be performed. This technology allows for complete glycoproteomic analysis of O-linked glycoproteins, as never before possible.



Enabling Proteomic Analysis

Sigma-Aldrich's GlycoProfile Beta-Elimination Kit allows for proteomic analysis, in that it does not completely destroy the protein, as seen with other traditional methods of β-elimination.

This is illustrated by SDS-PAGE of proteins before and after deglycosylation. Gel has been stained with EZBlue™ (Product No. G1041) and destained with water.

Gel Stained with EZBlue Image Lane 1: ColorBurst™ Marker, High Range (Product No. C1992)
Lanes 2 and 3: Fetuin prior to β-elimination
Lanes 4 and 5: Fetuin incubated in 50 mM NaOH overnight
Lanes 6 and 7: Fetuin incubated in NaBH4 and NaOH overnight (traditional β-elimination)
Lanes 8 and 9: Fetuin incubated in Sigm's β-elimination reagent at 4-8 °C overnight
Lanes 10 and 11: Fetuin incubated in Sigma's β-elimination reagent at room temperature overnight
Lane 12: SigmaMarker™, wide range (Product No. S8445)

There is no need to sacrifice sample to divide between glycan and protein analysis. Proteomic analysis by LC-MS prior to deglycosylation gives equivalent sequence coverage.

Sample # of Unique Peptides % Sequence Coverage
Trypzean*, before deglycosylation 24 55
Trypzean, after deglycosylation 29 55
Glycophorin A, before deglycosylation 17 53
Glycophorin A, after deglycosylation 22 59
*Trypzean is a recombinant trypsin, bovine sequence, expressed in corn.

Trypzean, before deglycosylation
Trypzean, before deglycosylation image

Trypzean, after deglycosylation
Trypzean, after deglycosylation image

Glycophorin A, before deglycosylation
Glycophorin A, before deglycosylation image

Glycophorin A, after deglycosylation
Glycophorin A, after deglycosylation image



O-glycan Analysis

Glycans of the expected mass from fetuin (A) and bovine mucin (B) are observed by MALDI-MS following β-elimination using Sigma-Aldrich's GlycoProfile Beta-Elimination kit and permethylation.

A. Fetuin
Fetuin Graph Image

B. Mucin
Mucin Graph Image

Since the β-elimination reagent is non-reducing, labelling of the O-glycans, such as with 2-AB, is possible. This is illustrated below with the chromatogram of O-glycans from Glycophorin A following 2-AB labelling.

Chromatogram of o-glycans image

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