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Partial purification and characterization of a thermostable alkaline protease from Lactobacillus brevis

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Author(s): Femi-Ola, T.O. | Oladokun, D.O.

Journal: Malaysian Journal of Microbiology
ISSN 1823-8262

Volume: 8;
Issue: 1;
Start page: 1;
Date: 2012;
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Keywords: Protease | Lactobacillus | Alkaline | Inhibitors | Detergent

ABSTRACT
Aims: The research was done to study the partial purification and characterization of thermostable alkaline protease from Lactobacillus brevis.Methodology and Results: The enzyme was purified in a two-step procedure involving ammonium sulphate precipitation and Sephadex G-150 gel permeation chromatography. The protease was purified 8.04 fold with a yield of approximately 30% after purification with Sephadex G-150 column. It has a relative molecular weight of 33.2 kDa and optimally active at a temperature of 60 oC and pH 9.0. The maximum velocity Vmax and Michaelis constant Km of the protease produced during the hydrolysis of casein were 66.66 U/mg protein and 3.33 mg/ml. It was strongly activated by Ca2+ and ethylene diamine tetra acetic acid (EDTA), mildly inhibited by Na+, K+, Mg2+ and Fe2+ and strongly inhibited by Cu2+ and Hg2+. The ability of the enzyme to improve the cleansing power of various detergents was also studied. Conclusion, significance and impact of study: The findings in this study suggest that the protease is a suitable candidate for detergent formulation and biotechnological applications.

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