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Multiple non-reducing chain termini isolated from bovine corneal keratan sulfates
G H Tai1, T N Huckerby, I A Nieduszynski
1Division of Biological Sciences, Institute of Environmental and Biological Sciences, Lancaster University, Bailrigg, Lancaster LA1 4YQ, United Kingdom.
The Journal of Biological Chemistry
|September 20, 1996
Summary
Researchers identified novel capping structures on bovine corneal keratan sulfate proteoglycans using advanced NMR spectroscopy. These findings enhance our understanding of corneal tissue composition and potential disease mechanisms.
Area of Science:
- Biochemistry
- Glycobiology
- Proteoglycan research
Background:
- Keratan sulfate proteoglycans are crucial components of corneal tissue.
- Understanding their structure is vital for comprehending corneal function and disease.
Purpose of the Study:
- To identify and characterize novel capping structures of oligosaccharides released from bovine corneal keratan sulfate.
- To determine the relative abundance of these capping structures.
Main Methods:
- Isolation and enzymatic digestion of keratan sulfate proteoglycans from bovine corneas.
- Reduction of released oligosaccharides with alkaline borohydride.
- Fractionation using Spherisorb chromatography.
- Structural elucidation via 600-MHz 1H NMR spectroscopy (1D and 2D methods).
Main Results:
- Identification of seven new families of capping structures, including sialylated and galactosylated oligosaccharides.
- Quantification of the relative molar proportions of these capping residues.
- The identified structures represent non-reducing termini of corneal keratan sulfate chains.
Conclusions:
- The study reveals a diverse array of capping structures on corneal keratan sulfate.
- These findings contribute to a more detailed understanding of corneal proteoglycan heterogeneity.
- Further research is needed to pinpoint the exact location of these structures on corneal keratan sulfate chains.