Abstract
The sialidase secreted byClostridium chauvoei NC08596 was purified to apparent homogeneity by ion-exchange chromatography, gel filtration, hydrophobic interaction-chromatography, FPLC ion-exchange chromatography, and FPLC gel filtration. The enzyme was enriched about 10 200-fold, reaching a final specific activity of 24.4 U mg−1. It has a relatively high molecular mass of 300 kDa and consists of two subunits each of 150 kDa. The cations Mn2+, Mg2+, and Ca2+ and bovine serum albumin have a positive effect on the sialidase activity, while Hg2+, Cu2+, and Zn2+, chelating agents and salt decrease enzyme activity. The substrate specificity, kinetic data, and pH optimum of the enzyme are similar to those of other bacterial sialidases.
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Abbreviations
- FPLC:
-
fast protein liquid chromatography
- NCTC:
-
National Collection of Type Cultures
- ATCC:
-
American Type Culture Collection
- MU-Neu5Ac:
-
4-methylumbelliferyl-α-d-N-acetylneuraminic acid
- buffer A:
-
0.02m piperazine, 0.01m CaCl2, pH 5.5
- buffer B:
-
0.02m piperazine, 0.01m CaCl2, 1.0m NaCl, pH 5.5
- buffer C:
-
0.1m sodium acetate, 0.01m CaCl2, pH 5.5
- SDS:
-
sodium dodecyl sulfate
- PAGE:
-
polyacrylamide gel electrophoresis
- Neu5Ac:
-
N-acetylneuraminic acid
- BSM:
-
bovine submandibular gland mucin
- GD1a:
-
IV3Neu5Ac, II3Neu5Ac-GgOse4Cer
- GM1:
-
II3Neu5Ac-GgOse4Cer
- MU-Neu4,5Ac2 :
-
4-methylumbelliferyl-α-d-N-acetyl-4-O-acetylneuraminic acid
- TLC:
-
thin-layer chromatography
- HPTLC:
-
high performance thin-layer chromatography
- EDTA:
-
ethylenediamine tetraacetic acid
- EGTA:
-
ethylene glycol bis(2-aminoethyl-ethen)-N,N,N′,N′-tetraacetic acid
- BSA:
-
bovine serum albumin
- Neu5Ac2en:
-
2-deoxy-2,3-didehydro-N-acetylneuraminic acid
- IEF:
-
isoelectric focusing
- IEP:
-
isoelectric point
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Heuermann, D., Roggentin, P., Kleineidam, R.G. et al. Purification and characterization of a sialidase fromClostridium chauvoei NC08596. Glycoconjugate J 8, 95–101 (1991). https://doi.org/10.1007/BF00731018
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DOI: https://doi.org/10.1007/BF00731018