10.12.2012 Views

Protein Protocols Protein Protocols

Protein Protocols Protein Protocols

Protein Protocols Protein Protocols

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

Enzymatic Release 827<br />

117<br />

Enzymatic Release of O- and N-Linked<br />

Oligosaccharide Chains<br />

Elizabeth F. Hounsell, Michael J. Davies, and Kevin D. Smith<br />

1. Introduction<br />

Enzymes involved in both the synthesis and degradation of glycoconjugates are highly<br />

specific for monosaccharide, linkage position, and anomeric configuration factors further<br />

away in the oligosaccharide sequence or protein. Not withstanding this, endo- and<br />

exoglycosidases are extremely useful tools in structural analysis. The RAAM technique<br />

has automated the use of exoglycosidase digestion (Oxford Glycosystems, Abingdon,<br />

UK). Here we discuss the release of intact oligosaccharide chains from proteins that can<br />

be further analyzed for separate functions (1,2).<br />

2. Materials<br />

2.1. Desalting<br />

1. 1 mL Spectra/Chrom desalting cartridge (Orme, Manchester, UK) or Biogel P –2 minicolumn.<br />

2. HPLC-grade H 2O.<br />

2.2. Glycosidases<br />

1. Endoglycosidase H (EC 3.2.1.96) (e.g., E. coli, Boehringer Mannheim, Lewes, UK).<br />

Digestion buffer: 250 mM sodium citrate buffer adjusted to pH 5.5 with 1 M HCl.<br />

2. Test-neuraminidase (EC 3.2.1.18) (e.g., Vibrio cholerae, Behring Ag, Marburg, Germany).<br />

Made up as 1 U/mL enzyme in digestion buffer and stored at 4°C. Digestion buffer:<br />

50 mM sodium acetate, 134 mM NaCl, 9 mM CaCl2. 3. Peptide-N-glycosidase F (EC 3.2.2.18) (e.g., Flavobacterium meningosepticum, Boehringer<br />

Mannheim). Digestion buffer: 40 mM potassium dihydrogen orthophosphate (KH2PO4), 10 mM EDTA adjusted to pH 6.2 with 1.0 M NaOH.<br />

4. O-glycosidase (EC 3.2.1.97) (e.g., Diplococcus pneunomiae, Boehringer Mannheim).<br />

Digestion buffer: 40 mM KH2PO4/10 mM EDTA adjusted to pH 6.0 with 1.0 M NaOH.<br />

5. Ice-cold ethanol.<br />

6. Toluene.<br />

3. Methods<br />

3.1. Desalting<br />

1. Wash the cartridge with 5 mL of HPLC-grade H 2O.<br />

2. Load the sample onto the cartridge in a volume between 50 and 200 µL H 2O.<br />

3. Elute the column with 200 µL of H 2O (including sample load).<br />

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

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

827

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!