Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Non-Essential Activation of Co2+ and Zn2+ on Mushroom Tyrosinase: Kinetic and Structural Stability

  • Gheibi, N. (Cellular and Molecular Research Center and Department of Biophysics, Qazvin University of Medical Sciences) ;
  • Saboury, A.A. (Institute of Biochemistry and Biophysics, University of Tehran) ;
  • Sarreshtehdari, M. (Department of Internal Medicine, School of Medicine, Qazvin University of Medical Sciences)
  • Received : 2010.11.08
  • Accepted : 2011.03.03
  • Published : 2011.05.20
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Abstract

Tyrosinase is a widespread enzyme with great promising capabilities. The Lineweaver-Burk plots of the catecholase reactions showed that the kinetics of mushroom tyrosinase (MT), activated by $Co^{2+}$ and $Zn^{2+}$ at different pHs (6, 7, 8 and 9) obeyed the non-essential activation mode. The binding of metal ions to the enzyme increases the maximum velocity of the enzyme due to an increase in the enzyme catalytic constant ($k_{cat}$). From the kinetic analysis, dissociation constants of the activator from the enzyme-metal ion complex ($K_a$) were obtained as $5{\times}10^4M^{-1}$ and $8.33{\times}10^3M^{-1}$ for $Co^{2+}$ and $Zn^{2+}$ at pH 9 and 6 respectively. The structural analysis of MT through circular dichroism (CD) and intensive fluorescence spectra revealed that the conformational stability of the enzyme in these pHs reaches its maximum value in the presence of each of the two metal ions.

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