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Release of N-Linked Oligosaccharide Chains 823<br />

116<br />

Release of N-Linked Oligosaccharide Chains<br />

by Hydrazinolysis<br />

Tsuguo Mizuochi and Elizabeth F. Hounsell<br />

1. Introduction<br />

Hydrazinolysis is the most efficient method of releasing all classes of N-linked<br />

oligosaccharide chains from glycoproteins. Disadvantages compared to enzymic<br />

release (see Chapter 117) is the use of hazardous chemicals, break up of the protein<br />

backbone, and destruction of some chains. The first of these can be obviated by use<br />

of a commercial machine for hydrazinolysis—the Glyco Prep (Oxford GlycoSystems,<br />

Abingdon, UK), but this is expensive, and as long as caution is exercised, the following<br />

method is excellent (1).<br />

2. Materials<br />

1. Anhydrous hydrazine (see Note 1).<br />

2. Toluene.<br />

3. Saturated sodium bicarbonate solution prepared at room temperature.<br />

4. Acetic anhydride.<br />

5. 1-Octanol.<br />

6. Lactose.<br />

7. 1 N Acetic acid.<br />

8. 1 N NaOH.<br />

9. Methanol.<br />

10. NaOH (0.05 N) freshly prepared from 1 N NaOH just before use.<br />

11. Sodium borotritide (NaB 3 H 4, approx 22 GBq/mmol) and approx 40 mM in dimethylformamide<br />

(silylation grade # 20672, Pierce Chemical Co., Rockford, IL).<br />

12. 1-Butanol:ethanol:water (4:1:1, v/v).<br />

13. Ethyl acetate:pyridine:acetic acid:water (5:5:1:3 v/v).<br />

14. Dowex 50W-X12 (H + form, 50–100 mesh).<br />

15. Whatman 3MM chromatography paper.<br />

16. Air-tight screw-cap tube with a Teflon disk seal.<br />

17. Dry heat block capable of maintaining 100°C.<br />

18. Vacuum desiccator.<br />

19. High-vacuum oil pump.<br />

20. Descending paper chromatography tank.<br />

From: The <strong>Protein</strong> <strong>Protocols</strong> Handbook, 2nd Edition<br />

Edited by: J. M. Walker © Humana Press Inc., Totowa, NJ<br />

823

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