Method for sequence determination using NMR
The invention relates to methods for analyzing polysaccharides. In particular, compositional and sequence information about the polysaccharides are derived. Some methods use NMR in conjunction with another experimental method, such as, capillary electrophoretic techniques for the analysis.
1. A method of analyzing an oligosaccharide, comprising:
obtaining a set of properties of the oligosaccharide by performing NMR spectroscopy and a non-NMR experimental method, wherein the NMR spectroscopy provides a measurement of one type of disaccharide linkage and the non-NMR experimental method provides a measurement of another type of disaccharide linkage, and
comparing the set of properties of the oligosaccharide, wherein the oligosaccharide comprises disaccharide repeat units of uronic acid, α-L-iduronic or β-D-glucuronic, linked to an α-glucosamine.
2. The method of claim 1 , wherein one of the types of disaccharide linkages is linkage between uronic acid and glucosamine and the other is between glucosamine and uronic acid.
3. The method of claim 1 , wherein the NMR spectroscopy includes a measure of the monosaccharide composition of the oligosaccharide.
4. The method of claim 1 , wherein the NMR spectroscopy includes the determination of the sulfation pattern of the oligosaccharide or fragments thereof.
5. The method of claim 1 , wherein the NMR spectroscopy is COSY, TOCSY, HSQC, DQF-COSY, NOESY or ROESY.
6. The method of claim 1 , wherein the NMR spectroscopy is 1D proton or 2D COSY/TOCSY.
7. The method of claim 1 , wherein the NMR spectroscopy is performed on the oligosaccharide in a fragmented form.
8. The method of claim 7 , wherein the fragmented form is produced by enzymatic digestion.
9. The method of claim 8 , wherein the enzymatic digestion is with a heparinase, glucuronidase, iduronidase or sulfatase.
10. The method of claim 1 , wherein the NMR spectroscopy is performed on the oligosaccharide in its intact form.
11. The method of claim 1 , wherein the non-NMR experimental method includes digesting the oligosaccharide to a fragmented form.
12. The method of claim 11 , wherein the fragmented form is produced by enzymatic digestion.
13. The method of claim 12 , wherein the enzymatic digestion is with a heparinase, glucuronidase, iduronidase or sulfatase.
14. The method of claim 1 , wherein the non-NMR experimental method includes chemical degradation.
15. The method of claim 14 , wherein the chemical degradation is with nitrous acid.
16. The method of claim 1 , wherein the other type of disaccharide linkage is measured by capillary electrophoresis.
17. The method of claim 1 , wherein the non-NMR experimental method includes end-labeling.
18. The method of claim 1 , wherein the non-NMR experimental method distinguishes the reducing and non-reducing ends of the oligosaccharide or fragments thereof.