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Protein Protocols Protein Protocols

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820 Hounsell, Davis, and Smith<br />

6. The resulting oligosaccharide containing fractions are then derivatized for LSIMS and<br />

GC-MS or analyzed by NMR.<br />

4. Note<br />

1. The GalNAc residue linked to Ser/Thr in O-linked chains is normally substituted at least<br />

at C-3 and therefore the alkali catalyzed β-elimination reaction will also result in “peeling”<br />

of the released oligosaccharide. This is obviated by concomitant reduction to give<br />

oligosaccharide alditols ending in GalNAcol. Endo-α-N-acetylgalactosaminidase<br />

digestion at hydrazinolysis under mild conditions can be used to release intact reducing<br />

sugars, which will have longer retention times on HPLC (4).<br />

References<br />

1. Davies, M. J., Smith, K. D., Harbin, A.-M., and Hounsell, E. F. (1992) High performance<br />

liquid chromatography of oligosaccharide alditols and glycopeptides on graphitized carbon<br />

column. J. Chromatogr. 609, 125–131.<br />

2. Davies, M. J., Smith, K. D., Carruthers, R. A., Chai, W., Lawson, A. M., and Hounsell, E. F.<br />

(1993) The use of a porous graphitized carbon (PGC) column for the HPLC of oligosaccharides,<br />

alditols and glycopeptides with subsequent mass spectrometry analysis.<br />

J. Chromatogr. 646, 317–326.<br />

3. Davies, M. J. and Hounsell, E. F. (1996) Comparison of separation modes for high performance<br />

liquid chromatography of glycoprotein- and proteoglycan-derived oligosaccharides.<br />

J. Chromatogr. 720, 227–234.<br />

4. Hounsel, E. F., ed. (1993) Methods in Molecular Biology, vol 14: Glycoprotein Analysis in<br />

Biomedicine, Humana, Totowa, NJ.

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