Applied Biochemistry and Biotechnology

, Volume 134, Issue 1, pp 77–87 | Cite as

Thiol-dependent serine alkaline proteases from Bacillus sp. HR-08 and KR-8102

Isolation, production, and characterization
  • Fatemeh Moradian
  • Khosro KhajehEmail author
  • Hossein Naderi-Manesh
  • Rahim Ahmadvand
  • Reza H. Sajedi
  • Majid Sadeghizadeh
Original Research Articles


Two Bacillus sp. strains, HR-08 and KR-8102, isolated from soil of the west and north parts of Iran were screened on gelatin agar medium for their ability to produce alkaline protease. The enzymes were active in a wide pH range (6.0–11.0) and stable in the alkaline range (7.0–12.0). The optimum temperatures for the protease from HR-08 and KR-8102 were 65 and 50°C, respectively. The irreversible thermoinactivation of HR-08 and KR-8102 proteases showed that the stability of HR-08 enzyme was higher than that of KR-8102 and the half-lives of these enzymes were 95 and 32 min at 50°C, respectively. In the presence of 10 mM Ca2+, HR-08 retained 100, 90, and 20% of its initial activity after heating for 30 min at 50, 60, and 70°C, respectively. Enzymes were inhibited by phenylmethylsulfonyl fluoride and iodoacetate. After inhibition by iodoacetate, both enzymes were reactivated by dithiothreitol. These data show that the enzymes seem to be thiol-dependent serine alkaline proteases. The enzymes especially from HR-08 were stable in the presence of H2O2, surfactants, and local detergents; their activities were enhanced in the presence of 5 mM Fe2+; and the presence of 5mM metal ions such as Mg2+, Cu2+, and Mn2+ produced almost no effect.

Index Entries

Proteolytic enzyme thermostability thiol-dependent protease commercial detergent inhibition 


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Copyright information

© Humana Press Inc 2006

Authors and Affiliations

  • Fatemeh Moradian
    • 1
  • Khosro Khajeh
    • 1
    Email author
  • Hossein Naderi-Manesh
    • 1
  • Rahim Ahmadvand
    • 1
  • Reza H. Sajedi
    • 1
  • Majid Sadeghizadeh
    • 1
  1. 1.Department of Biochemistry, Faculty of SciencesTarbiat Modarres UniversityTehranIran

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