Journal of Microbiology

The Microbiological Society of Korea (한국미생물학회)
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Purification and characterization of catalase-3 of deinococcus radiophilus

  • Lee, In-Jeong (Department of Microbiology, Chungbuk National University) ;
  • Lee, young-Nam (Department of Microbiology, Chungbuk National University)
  • Published : 1995.09.01
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Abstract

Deinococcus radiophilus, an UV resistant bacterium seemed to contain three issoenzymes of catalase. Among them, the samllest and most abundant species in cell-free extract, catalase-3 which also exhibited peroxidase activity was purified to electrophoretic homogeneity (145-fold purification) by chromatographic procedures. Its molecular weight was 155 kDa composed of four 38 kDa subunits. The $K_{m}$ value of catalase-3 for H$\_$2/O$\_$2/ was approximately 0.5 mM. This enzyme showed a typical ferric heme spectrum with maximum absorption at 405 nm. Upon binding to cyanide, the 405 nm peak shifted to 420 nm. Catalase-3 was very sensitive to inhibitors of heme proteins, such as cyanide, azide and hydroxylamine. A ratio of A$\_$405/A$\_$28O/ was 0.5 Catalase-3 was active over a wide range of pH, between pH 7 and 10. The enzyme was rather heat-labile and partially sensitive to edthanol-chloroform treatment, but resistant to 3-amino-1, 2, 4-triazole. Catalase-3 of D. radiophilus, which is a bifunction catalatic peroxidatic enzyme seemed to share certain molecular properties with the typical catalase and the catalase-[roxidase along with its own unique features.

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