Secretory expression of thermostable alkaline protease from Bacillus stearothermophilus F1 by using native signal peptide and α-factor secretion signal in Pichia pastoris

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  • Latiffi Amaliawati Ahmad
    Enzyme and Microbial Technology Research Center Department of Biochemistry, Faculty of Biotechnology and Biomolecular Sciences
  • Salleh Abu Bakar
    Enzyme and Microbial Technology Research Center Department of Biochemistry, Faculty of Biotechnology and Biomolecular Sciences Institute of Bioscience, Universiti Putra Malaysia
  • Rahman Raja Noor Zaliha Raja Abd.
    Enzyme and Microbial Technology Research Center Department of Microbiology, Faculty of Biotechnology and Biomolecular Sciences Institute of Bioscience, Universiti Putra Malaysia
  • Oslan Siti Nurbaya
    Enzyme and Microbial Technology Research Center Institute of Bioscience, Universiti Putra Malaysia
  • Basri Mahiran
    Enzyme and Microbial Technology Research Center Deparment of Chemistry, Faculty of Science Institute of Bioscience, Universiti Putra Malaysia

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  • Secretory expression of thermostable alkaline protease from <i>Bacillus stearothermophilus</i> FI by using native signal peptide and <b>α</b>-factor secretion signal in <i>Pichia pastoris</i>

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The thermostable alkaline protease from Bacillus stearothermophilus F1 has high potential for industrial applications, and attempt to produce the enzyme in yeast for higher yield was undertaken. Secretory expression of F1 protease through yeast system could improve enzyme’s capability, thus simplifying the purification steps. Mature and full genes of F1 protease were cloned into Pichia pastoris expression vectors (pGAPZαB and pPICZαB) and transformed into P. pastoris strains (GS115 and SMD1168H) via electroporation method. Recombinant F1 protease under regulation constitutive GAP promoter revealed that the highest expression was achieved after 72 h cultivation. While inducible AOX promoter showed that 0.5% (v/v) methanol was the best to induce expression. It was proven that constitutive expression strategy was better than inducible system. The α-secretion signal from the plasmid demonstrated higher secretory expression level of F1 protease as compared to native Open Reading Frame (ORF) in GS115 strain (GE6GS). Production medium YPTD was found to be the best for F1 protease expression with the highest yield of 4.13 U/mL. The protein was expressed as His-tagged fusion protein with a size about 34 kDa.

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