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A biotin capture assay for oligosaccharyltransferase
Anjali Srinivasan1, James K Coward
1Department of Medicinal Chemistry, University of Michigan, Ann Arobr 48109-1055, USA.
Analytical Biochemistry
|July 19, 2002
Summary
A new assay simplifies monitoring the oligosaccharyltransferase (OST) enzyme reaction. This method uses a biotinylated peptide and radiolabeled substrate for rapid, reproducible analysis of protein glycosylation.
Area of Science:
- Biochemistry
- Enzymology
- Glycobiology
Background:
- Oligosaccharyltransferase (OST) is crucial for N-linked protein glycosylation, transferring oligosaccharides to proteins.
- The established method for monitoring OST activity is laborious, involving solvent extractions and HPLC.
- A more efficient assay is needed to study OST-catalyzed reactions.
Purpose of the Study:
- To develop a rapid and reproducible assay for monitoring oligosaccharyltransferase (OST) activity.
- To replace the time-consuming traditional methods for OST reaction analysis.
Main Methods:
- Utilized a biotinylated peptide as the acceptor substrate.
- Employed dolichylpyrophosphate [3H]chitobiose as the donor substrate.
- Separated the biotinylated glycopeptide product using avidin-agarose beads and quantified it via scintillation counting.
Main Results:
- The new assay enables rapid separation and quantification of the OST reaction product.
- Demonstrated highly reproducible results using the developed method.
- Significantly reduced the time and complexity compared to traditional assays.
Conclusions:
- The biotinylated peptide-based assay provides an efficient and reliable method for studying OST activity.
- This assay facilitates faster research in protein glycosylation and related biological processes.