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Int. J. Mol. Sci. 2012, 13(2), 1733-1746;

Characterization of Catalase from Psychrotolerant Psychrobacter piscatorii T-3 Exhibiting High Catalase Activity

Department of Bioscience and Technology, School of Engineering, Tokai University, Minamisawa, Minami-ku, Sapporo 005-8601 Japan
Bioproduction Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 2-17-2-1 Tsukisamu-Higashi, Toyohira-ku, Sapporo, 062-8517 Japan
Department of Applied Molecular Chemistry, College of Industrial Technology, Nihon University, 1-2-1, Izumichou, Narashino, Chiba 275-8575 Japan
Author to whom correspondence should be addressed.
Received: 4 January 2012 / Revised: 16 January 2012 / Accepted: 30 January 2012 / Published: 7 February 2012
(This article belongs to the Section Biochemistry, Molecular and Cellular Biology)
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A psychrotolerant bacterium, strain T-3 (identified as Psychrobacter piscatorii), that exhibited an extraordinarily high catalase activity was isolated from the drain pool of a plant that uses H2O2 as a bleaching agent. Its cell extract exhibited a catalase activity (19,700 U·mg protein−1) that was higher than that of Micrococcus luteus used for industrial catalase production. Catalase was approximately 10% of the total proteins in the cell extract of the strain. The catalase (PktA) was purified homogeneously by only two purification steps, anion exchange and hydrophobic chromatographies. The purified catalase exhibited higher catalytic efficiency and higher sensitivity of activity at high temperatures than M. luteus catalase. The deduced amino acid sequence showed the highest homology with catalase of Psycrobacter cryohalolentis, a psychrotolelant bacterium obtained from Siberian permafrost. These findings suggest that the characteristics of the PktA molecule reflected the taxonomic relationship of the isolate as well as the environmental conditions (low temperatures and high concentrations of H2O2) under which the bacterium survives. Strain T-3 efficiently produces a catalase (PktA) at a higher rate than Exiguobacterium oxidotolerans, which produces a very strong activity of catalase (EktA) at a moderate rate, in order to adapt to high concentration of H2O2. View Full-Text
Keywords: catalase; Psycrobacter piscatorii; PktA; hydrogen peroxide catalase; Psycrobacter piscatorii; PktA; hydrogen peroxide
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Kimoto, H.; Yoshimune, K.; Matsuyma, H.; Yumoto, I. Characterization of Catalase from Psychrotolerant Psychrobacter piscatorii T-3 Exhibiting High Catalase Activity. Int. J. Mol. Sci. 2012, 13, 1733-1746.

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