Shen, J., Kan, G., Shi, C. et al. Purification and characterization of cold-active endo-1,4-β-glucanase produced by Pseudoalteromonas sp. AN545 from Antarctica., Chin. J. Ocean. Limnol. 29, 1086–1092 (2011). https://doi.org/10.1007/s00343-011-0311-4
DOI:
Shen, J., Kan, G., Shi, C. et al. Purification and characterization of cold-active endo-1,4-β-glucanase produced by Pseudoalteromonas sp. AN545 from Antarctica., Chin. J. Ocean. Limnol. 29, 1086–1092 (2011). https://doi.org/10.1007/s00343-011-0311-4DOI:
Purification and characterization of cold-active endo-1,4-β-glucanase produced by Pseudoalteromonas sp. AN545 from Antarctica
摘要
Abstract
A bacterium hydrolyzing carboxymethylcellulose
isolated from Antarctic sea ice
was identified as Pseudoalteromonas sp. based on 16S rDNA gene sequences and named as Pseudoalteromonas sp. AN545. The extracellular endo-1
4-β-glucanase AN-1 was purified successively by ammonium sulfate precipitation
DEAE-Sepharose ion exchange chromatography and Sephadex G-75 gel filtration chromatography. The molecular mass of AN-1 was estimated to be 47.5 kDa utilizing SDS-PAGE and gel chromatography analysis. AN-1 could hydrolyze caboxymethylcellulose
avicel and β-glucan
but not cellobiose
xylan and p-Nitrophenyl-β-D-glucopyranoside. The optimal temperature and pH for the β-glucanase activity of AN-1 were determined to be at 30°C and pH 6.0
respectively. AN-1 was stable at acidic solutions of pH 5.0–6.5 and temperatures below 30°C for 1 h. Moreover
the specific activity was enhanced by Ca2+ and Mg2+
and inhibited by Cu2+. The kinetic parameters Michaelis constant (K m) and maximum velocity (V max) of AN-1 were 3.96 mg/mL and 6.06×10−2 mg/(min·mL)
respectively.
关键词
Keywords
references
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