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Production, purification, and characterization of metalloprotease from Candida kefyr 41 PSB.
International Journal of Biological Macromolecules 2017 January
A thermostable metalloprotease, produced from an environmental strain of Candida kefyr 41 PSB, was purified 16 fold with a 60% yield by cold ethanol precipitation and affinity chromatography (bentonite-acrylamide-cysteine microcomposite). The purified enzyme appeared as a single protein band at 43kDa. Its optimum pH and temperature points were found to be 7.0 and 105°C, respectively. Km and Vmax values of the enzyme were determined to be 3.5mg/mL and 4.4μmolmL(-1)min(-1), 1.65mg/mL and 6.1μmolmL(-1)min(-1), using casein and gelatine as the substrates, respectively. The activity was inhibited by using ethylenediamine tetraacetic acid (EDTA), indicating that the enzyme was a metalloprotease. Stability of the enzyme was investigated by using thermodynamic and kinetic parameters. The thermal inactivation profile of the enzyme conformed to the first order kinetics. The half life of the enzyme at 95, 105, 115, 125 and 135°C was 1310, 610, 220, 150, and 86min, respectively.
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