Purification and Characterization of NADH-Dependent Cr(VI) Reductase from Escherichia coli ATCD33456

  • Bae, Woo-Chul (Department of Biological Sciences/BK21 Graduate Program in Environmental and Biological Engineering, MyungJi University) ;
  • Kang, Tae-Gu (Department of Biological Sciences/BK21 Graduate Program in Environmental and Biological Engineering, MyungJi University) ;
  • Jung, Jae-Han (Department of Biological Sciences/BK21 Graduate Program in Environmental and Biological Engineering, MyungJi University) ;
  • Park, Chul-Jae (Department of Biological Sciences/BK21 Graduate Program in Environmental and Biological Engineering, MyungJi University) ;
  • Choi, Sung-Chan (Department of Environmental Science, Hallym University) ;
  • Jeong, Byeong-Chul (Department of Environmental Science, Hallym University)
  • Published : 2000.10.01

Abstract

A soluble Cr(VI) reductase was purified from the Cr(VI) reducing strain Escherichia coli ATCC33456 by ammonium sulfate fractionation, and chromatographies on Q-Sepharose FF, Cibacron blue 3GA dye affinity, Mono-Q 5/5, and Superdex 200 HR 10/30 columns. The estimated molecular mass of the purified enzyme was 27 kDa on SDS-polyacrylamide gel electrophoresis and 54 kDa on gel filtration, thus indicating a dimeric structure. The isoelectric point of the enzyme was pH 4.85. The optimum reaction pH and storage pH were both 7.0, the optimum reaction temperature was $37^{\circ}C$, and the storage temperature was $4^{\circ}C$. NADH and NADPH both served as electron donors for the reductase, with $V_{max}$ of 68.3 ${\mu}M$ Cr(VI)/min/mg protein and Km of 7.6 $\mu$M using HADH, and Vmax of 42.3 ${\mu}M$ Cr(VI)/min/mg protein and Km of 14.6 $\muM$ using NADPH. When 1 mM EDTA was added, the Cr(VI) reducing activity increased 4-fold.

Keywords

References

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