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Production and optimization of a commercially viable alkaline protease from a haloalkaliphilic bacterium

Biotechnology and Bioprocess Engineering volume 13, pages 552–559 (2008)Cite this article

Abstract

Twenty five haloalkaliphilic bacterial strains were isolated from sea water along the Coastal Gujarat (India) and screened for their ability to secret alkaline proteases. Among them, a potent strain S-20-9 (GenBank accession number EU118360), resembling to Halophilic Bacterium MBIC3303 on the basis of 16S rRNA gene sequencing, was selected for the optimization of enzyme production. S-20-9 produced protease optimally, under aerobic conditions during mid-stationary phase over a broad range of salt (5∼25%, w/v) and pH (7∼10). The optimum production was at pH 9 and 15% (w/v) NaCl. The production was suppressed by lactose, maltose, sucrose, and inorganic nitrogen sources, especially ammonium ions. Further, the production was significantly stimulated by KH2PO4 and suppressed by glucose. Similarly, the production was also suppressed at higher concentrations of gelatin, yeast extract, peptone, and casamino acids, indicating towards a threshold value for nitrogen requirement. The growth and protease production were enhanced by mono-valent cation (KCl), while the divalent cations acted as inhibitors. The study holds significance as only few reports are available on the alkaline proteases from haloalkaliphilic bacteria, particularly those from moderate saline habitats.

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Authors and Affiliations

  1. Laboratory of Marine Microbiology, Department of Biosciences, Saurashtra University, Rajkot, 360 005, Gujarat, India

    R. H. Joshi, M. S. Dodia & S. P. Singh

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  1. R. H. Joshi
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  2. M. S. Dodia
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  3. S. P. Singh
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Correspondence to S. P. Singh.

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Joshi, R.H., Dodia, M.S. & Singh, S.P. Production and optimization of a commercially viable alkaline protease from a haloalkaliphilic bacterium. Biotechnol Bioproc E 13, 552–559 (2008). https://doi.org/10.1007/s12257-007-0211-9

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  • DOI: https://doi.org/10.1007/s12257-007-0211-9

Keywords

  • haloalkaliphilic bacteria
  • alkaline protease
  • production
  • optimization
  • sea water