Download Glycoprotein Analysis in Biomedicine (Methods in Molecular by Elizabeth F. Hounsell PDF

By Elizabeth F. Hounsell

Glycoprotein research in Biomedicine brings jointly a accomplished diversity of protocols regarding carbohydrate biochemistry. the 1st 1/2 the handbook outlines physiochemical (MS and NMR), chemical, and chromatographic recommendations for outlining the buildings and variety of oligosaccharide sequences. the second one part describes extra organic and immunological ways used to notice alterations in glycosylation styles in disorder.

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Gas chromatogram of permethylated neutral ohgosaccharide alditols released from rat small intestine mucin glycopeptides. Interpreted components from CC-MS are marked. Abbreviations are H for hexose, HN for N-acetylhexosamine, F for fucose, and HNol for N-aceQdhexosaminito1 (GalNAc linked to the peptide). 04 pm of crosslinked PS 264 was used with a temperature program from 70°C (1 min> to 390°C (lO”C/min). 7 bar, giving a linear velocity of 90 cm/s at 70°C.

8. Gently shake the tube to mix the two phases. To speed up the phase separation, spin the tube in a small table-top centrifuge for 5 min and remove the upper water phase by a Pasteur pipet. 9. Add 2 or 4 mL ofwater and centrifuge again. Remove the water phase. Repeat this another two times. 10. Add 2 or 4 mL of water, centrifuge, and by using a Pasteur pipet, carefully remove the lower (chloroform phase) to a clean tube. Add 1 or 2 mL of chloroform, centrifuge, and remove the lower phase once more to the same tube.

A FAB-mass spectrum of a complex triantennary structure is shown in Fig. 1. The linkage positions in the sialylated branches have been explained earlier. The primary sequence ion of m/z 946 combined with a secondary of m/z914, formed by elimination of methanol, shows that a sequence of Neu5Ac23Gall-4GlcNAc is linked to the Z-position of a mannose residue (I). The binding positions to the disubstituted Man residues, however, cannot be deduced from the spectrum. In order to enhance the formation of a molecular ion species, especially for high-mol-wt compounds, a separate high-mass scan is recorded after addition of sodium iodide to the sample and an [M + 23]+ ion is formed (4).

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