Biotechnology and Bioprocess Engineering:BBE

The Korean Society for Biotechnology and Bioengineering (한국생물공학회)
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Characterization of 1,4-Benzoquinone Reductase from Bovine Liver

  • Published : 2002.07.01
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Abstract

1,4-Benzoquinone reductase was purified to electrophoretic homogeneity from bovine liver, and the purified enzyme found to have a molecular mass of 29 kDa, as determined by sodium dodecyl sulfate- polyacrylamide gel electrophoresis The enzyme exhibited pH optimum between 8.0 and 8.5. The apparent fm for 1,4-benzoqulnone was 1.643 mM, and the apparent Km for NADH was 1.837 mM. Various divalent cations, such as Hg$\^$2+/, Cu$\^$2+/, and Zn$\^$2+/, exhibited strong inhibitory effects. The enzyme activity was also strongly inhibited by quercetin, dicumarol, and benzoic acid. Incubation of the enzyme with N-bromosuccinimide and pyridoxal 5’-phosphate led to inhibitions of 100% and 99%, respectively. Accordingly, these results suggest that trypto-phan and Iysine residues are Involved at or near the active sites of the enzyme.

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