Abstract
Endo-β-galactosidases cleave the internal β-linked galactosyl residues of sugar chains in glycoconjugates and release oligosaccharides as their products. Based on the oligosaccharide products, the microbial endo-β-galactosidases [1] can be divided into four classes, of which the products are, respectively: (a) GlcNAcβ1 → 3Gal, (b) Galα1 → 3Gal, (c) blood group A-trisaccharide and B-trisaccharide, and (d) GlcNAcα1 → 4Gal. Endo-β-galactosidases, as well as other glycosidases, are often present as contaminants in commercial enzyme preparations. Their presence as contaminants is not easily recognized or clearly indicated. The use of an enzyme preparation with unknown contaminants can give unexplainable results or cause misinterpretation. However, the enzyme contaminants may sometimes provide opportunities for new discoveries. Endo-ABase was discovered through the use of an impure commercial clostridial sialidase preparation.
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Abbreviations
- A+-PGM:
-
Blood group A+ porcine gastric mucin
- B+-HOCG:
-
Blood group B+ human ovarian cyst glycoprotein
- A-Tri:
-
GalNAcα1 → 3(Fucα1 → 2)Gal
- A-Tetra:
-
GalNAcα1 → 3(Fucα1 → 2) Galβ1 → 4Glc
- A-Penta:
-
GalNAcα1 → 3(Fucα1 → 2)Galβ1 → 4(Fucα1 → 3)Glc
- A-Hexa:
-
GalNAcα1 → 3-(Fucα1 → 2)Galβ1 → 3GlcNAcβ1 → 3Galβ1 → 4Glc
- B-Tri:
-
Galα1 → 3(Fucα1 → 2)Gal
- B-Penta:
-
Galα1 → 3-(Fucα1 → 2)Galβ1 → 4(Fucα1 → 3)Glc
- Endo-ABase:
-
Blood group A and B cleaving endo-β-galactosidase
- nEndo-ABase and rEndo-ABase:
-
The native and the recombinant Endo-ABase respectively
- FPLC:
-
Fast protein liquid chromatography
- TLC:
-
Thin-layer chromatography
- ConA:
-
Concanavalin A
- LB:
-
Luria–Bertani medium
- CNBr:
-
Cyanogen bromide
- DEAE:
-
Diethylaminoethyl
- SP:
-
Sulfopropyl
- Ni-NTA:
-
Ni-nitrilotri-acetic acid
- CV:
-
Column volume
- SSC:
-
17.5% Sodium chloride/8.8% sodium citrate, pH 7.0
- SM:
-
0.58% Sodium chloride/0.20% magnesium sulfate/50 mM Tris–HCl, pH 7.5/0.01% gelatin
- RBC:
-
Human red blood cells
- FRP:
-
Fucolectin-related protein
- FITC:
-
Fluorescene-5-isothiocyanate
- FACS:
-
Fluorescene-activated cell sorter
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Acknowledgments
We thank the late Professor Winifred M. Watkins for the generous gift of the HOCG samples used in this work. Thanks are also due to Dr. Bernard Henrissat for his invaluable advice on the classification of GHs. This work was supported by National Institutes of Health grant NS 09626.
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Li, SC., Anderson, K.M., Li, YT. (2011). A Unique Endo-β-Galactosidase that Cleaves Both Blood Group A and B Glycotopes. In: Wu, A. (eds) The Molecular Immunology of Complex Carbohydrates-3. Advances in Experimental Medicine and Biology, vol 705. Springer, Boston, MA. https://doi.org/10.1007/978-1-4419-7877-6_5
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DOI: https://doi.org/10.1007/978-1-4419-7877-6_5
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