Purification and Characterization of Two Novel Halotolerant Extracellular Proteases from Bacillus subtilis Strain FP-133

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  • SETYORINI Endang
    Division of Life Science, Graduate School of Science and Technology, Kobe University
  • TAKENAKA Shinji
    Laboratory of Applied Microbiology, Department of Biofunctional Chemistry, Faculty of Agriculture, Kobe University
  • MURAKAMI Shuichiro
    Laboratory of Applied Microbiology, Department of Biofunctional Chemistry, Faculty of Agriculture, Kobe University
  • AOKI Kenji
    Laboratory of Applied Microbiology, Department of Biofunctional Chemistry, Faculty of Agriculture, Kobe University

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  • Purification and Characterization of Two Novel Halotolerant Extracellular Proteases from<i>Bacillus subtilis</i>Strain FP-133

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Abstract

Bacillus subtilis strain FP-133, isolated from a fermented fish paste, synthesized two novel halotolerant extracellular proteases (expro-I and expro-II), showing activity and stability at concentrations of 0–20% (w/v) NaCl. Each protease was purified to homogeneity and characterized. The purified expro-I was a non-alkaline serine protease with an optimum pH of 7.5, although most serine proteases from Bacillus strains act at the alkaline side. The molecular mass of expro-I was 29 kDa. The purified expro-II was a metalloprotease with a molecular mass of 34 kDa. It was activated by Fe2+, which has never been reported as a bacterial protease activator. At a concentration of 7.5% (w/v) NaCl, both proteases preferred animal proteins to vegetable proteins as natural substrates. In addition, under saline conditions, expro-I and II showed high catalytic activity toward gelatin and casein respectively.

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