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Screening for Cold-Active Protease-Producing Bacteria from the Culture Collection of Polar Microorganisms and Characterization of Proteolytic Activities  

Kim, Doc-Kyu (Polar BioCenter, Korea Polar Research Institute)
Park, Ha-Ju (Polar BioCenter, Korea Polar Research Institute)
Lee, Yung-Mi (Polar BioCenter, Korea Polar Research Institute)
Hong, Soon-Gyu (Polar BioCenter, Korea Polar Research Institute)
Lee, Hong-Kum (Polar BioCenter, Korea Polar Research Institute)
Yim, Joung-Han (Polar BioCenter, Korea Polar Research Institute)
Publication Information
Korean Journal of Microbiology / v.46, no.1, 2010 , pp. 73-79 More about this Journal
Abstract
The Korea Polar Research Institute (KOPRI) has assembled a culture collection of cold-adapted bacterial strains from both the Arctic and Antarctic. To identify excellent protease-producers among the proteolytic bacterial collection (874 strains), 78 strains were selected in advance according to their relative activities and were subsequently re-examined for their extracellular protease activity on $0.1{\times}$ ZoBell plates supplemented with 1% skim milk at various temperatures. This rapid and direct screening method permitted the selection of a small group of 15 cold-adapted bacterial strains, belonging to either the genus Pseudoalteromonas (13 strains) or Flavobacterium (2 strains), that showed proteolytic activities at temperatures ranging between $5-15^{\circ}C$. The cold-active proteases from these strains were classified into four categories (serine protease, aspartic protease, cysteine protease, and metalloprotease) according to the extent of enzymatic inhibition by a class-specific protease inhibitor. Since highly active and/or cold-adapted proteases have the potential for industrial or commercial enzyme development, the protease-producing bacteria selected in this work will be studied as a valuable natural source of new proteases. Our results also highlight the relevance of the Antarctic for the isolation of protease-producing bacteria active at low temperatures.
Keywords
Antarctic; Arctic; cold-active; culture collection; protease;
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