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By Christopher Walsh

Christoph Kannicht and a panel of hugely skilled researchers describe easily reproducible equipment for detecting and interpreting the posttranslational alterations of protein, rather with reference to protein functionality, proteome study, and the characterization of pharmaceutical proteins. one of the tools offered are these for examining the task of disulfide bond websites in proteins, protein N-glycosylation and protein O-glycosylation, and oligosaccharides current at particular unmarried glycosylation websites in a protein. extra strong ideas facilitate the research of glycosylphosphatidylinositols, lipid transformations, protein phosphorylation and sulfation, protein methylation and acetylation, a-amidation, g-glutamate, isoaspartate, and lysine hydroxylation.

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7. , step 5 with water to 2 mL, put it onto the top of the purified microconcentrator tubes, and apply it to ultrafiltration by centrifugation at 5,000g at 4°C for 2 h. Collect the filtrate, containing the N-glycans, and separate the remaining amount of hydrolyzed N-glycans, peptides, and salt in the top of the concentrator tubes from protein (trypsin and Enzymatical Hydrolysis of N-Glycans 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 41 PNGaseF) by twice adding 2 mL distilled water to the top of the tubes and centrifuging as described earlier.

3. 15. National Scientific, BC16NA-BP) (see Note 4). 4. 4% (w/v) Sodium acetate (trihydrate)-2% (w/v) boric acid (granular) in methanol (see Note 3). 5. Anthranilic acid (AA) solution: Weigh approx 45 mg of anthranilic acid (2-amino benzoic acid) into a polypropylene vial. Add approx 30 mg of sodium cyanoborohydride. 5 mL of the sodium acetate-boric acidmethanol solution. (Note: Sodium cyanoborohydride is a poison and tends to absorb moisture readily from the air, which may affect the derivatization reaction.

2. Protein Concentration Determination Each sample should be clear at this point (see Note 18). Pool the contents of the clarified samples if additional amount of protein is required (see Note 19). 1. Prepare a 10-fold dilution of the pooled material using Milli-Q water (acidic samples) or 5% acetic acid solution (basic samples). This diluted purified sample will be used in the monosaccharide analysis. 28 Saddic et al. 2. Read the absorbance of the diluted material at 280 nm against a blank, which has been diluted in similar manner to the sample (see Note 20).

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