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Journal of Bacteriology, April 2000, p. 1903-1909, Vol. 182, No. 7
Bioscience and Chemistry Division, Hokkaido
National Industrial Research Institute, Tsukisamu-Higashi, Toyohira-ku,
Sapporo 062-8517,1 Department of
Bioscience and Technology, School of Engineering, Hokkaido Tokai
University, Minaminosawa, Minami-ku, Sapporo
005-8601,2 and Laboratory of
Environmental Molecular Biology, Graduate School of Environmental
Earth Science, Hokkaido University, Sapporo
060-0810,3 Japan
Received 8 July 1999/Accepted 7 January 2000
Catalase from the facultatively psychrophilic bacterium
Vibrio rumoiensis S-1T, which was isolated from
an environment exposed to H2O2 and exhibited high catalase activity, was purified and characterized, and its localization in the cell was determined. Its molecular mass was 230 kDa, and the molecule consisted of four identical subunits. The enzyme,
which was not apparently reduced by dithionite, showed a Soret peak at
406 nm in a resting state. The catalytic activity was 527,500 U
· mg of protein
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Purification and Characterization of a Catalase
from the Facultatively Psychrophilic Bacterium Vibrio
rumoiensis S-1T Exhibiting High Catalase
Activity

1 under standard reaction conditions at
40°C, 1.5 and 4.3 times faster, respectively, than those of the
Micrococcus luteus and bovine catalases examined under the
same reaction conditions, and showed a broad optimum pH range (pH 6 to
10). The catalase from strain S-1T is located not only in
the cytoplasmic space but also in the periplasmic space. There is
little difference in the activation energy for the activity between
strain S-1T catalase and M. luteus and bovine
liver catalases. The thermoinstability of the activity of the former
catalase were significantly higher than those of the latter catalases.
The thermoinstability suggests that the catalase from strain
S-1T should be categorized as a psychrophilic enzyme.
Although the catalase from strain S-1T is classified as a
mammal type catalase, it exhibits the unique enzymatic properties of
high intensity of enzymatic activity and thermoinstability. The results
obtained suggest that these unique properties of the enzyme are in
accordance with the environmental conditions under which the
microorganism lives.
*
Corresponding author. Mailing address: 2-17-2-1 Tsukisamu-Higashi, Toyohira-ku, Sapporo 062-8517, Japan. Phone:
81-11-857-8925. Fax: 81-11-857-8900. E-mail:
yumoto{at}hniri.go.jp.
Present address: Institute of Plant Biology Biological Research
Center, Hungarian Academy of Sciences Temesvari krt. 62, H-6701 Szeged, Hungary.
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