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Carbohydrate structure of human pancreatic elastase 1
P Wendorf1, D Linder, A Sziegoleit
1Institut für Medizinische Mikrobiologie, Universität Giessen, Federal Republic of Germany.
The Biochemical Journal
|September 1, 1991
Summary
Human pancreatic elastase 1 (E1) glycosylation was studied using glycans from post-mortem pancreas tissue. Complex-type glycans featured blood group determinants on lactosamine antennae.
Area of Science:
- Biochemistry
- Glycobiology
- Human Pancreas Research
Background:
- Human pancreatic elastase 1 (E1) is a glycoprotein with glycosylation sites.
- Understanding E1 glycosylation is crucial for its biological function.
Purpose of the Study:
- To investigate the structural characteristics of carbohydrate moieties in human pancreatic elastase 1.
- To identify specific glycan structures and their linkages in E1.
Main Methods:
- Glycoprotein isolation from post-mortem pancreas tissue.
- Enzymatic digestion (trypsin, PNGase F) and glycan liberation.
- Radiolabelling, HPLC, gel filtration, methylation analysis, and exoglycosidase degradation for structural characterization.
Main Results:
- Major oligosaccharide alditol fractions (67.8%) were characterized.
- Partially truncated, biantennary complex-type glycans were predominant.
- Blood group A, B, Lea (or X), difucosyl A, or difucosyl B determinants were identified on lactosamine antennae linked to Man(alpha 1-3) residues.
Conclusions:
- Human pancreatic elastase 1 possesses complex glycosylation patterns.
- Specific blood group determinants are integral components of E1 glycans.
- These findings contribute to the understanding of E1 structure-function relationships.