Abstract
A β-1,3-endoglucanase produced by Streptomyces rutgersensis was purified to a homogeneity by the fractional precipitation with ammonium sulfate, ion exchange chromatography on Q-Sepharose and hydrophobic chromatography on Butyl Sepharose. A typical procedure provided 11.74-fold purification with 12.53 % yield. SDS-PAGE of the purified protein showed one protein band. The exact molecular mass of the enzyme obtained by mass spectrometry was 41.25 kDa; the isoelectric point was between pH 4.2–4.4. The optimal β-glucanase catalytic activity was at pH 7 and 50 °C. An enzyme was only active toward glucose polymers containing β-1,3 linkages and hydrolyzed Saccharomyces cerevisiae cell wall β-glucan in an endo-like way: reaction products were different molecular size β-glucans, which were larger than glucose.
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Abbreviations
- AU:
-
Unit of enzyme activity
- ESI:
-
Electrospray ionization
- Km :
-
Michaelis–Menten constant
- MS:
-
Mass spectrometry
- pI:
-
Isoelectric point
- QTOF:
-
Quadrupole time-of-flight mass spectrometer
- RPM:
-
Revolutions per minute
- SDS-PAGE:
-
Sodium dodecyl sulfate polyacrylamide gel electrophoresis
- SEC:
-
Size-exclusion chromatography
- TLC:
-
Thin layer chromatography
- Vmax :
-
Maximum velocity
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Javmen, A., Grigiškis, S., Rudenkov, M. et al. Purification and Partial Characterization of a Novel β-1,3-Endoglucanase from Streptomyces rutgersensis . Protein J 32, 411–417 (2013). https://doi.org/10.1007/s10930-013-9500-7
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DOI: https://doi.org/10.1007/s10930-013-9500-7