Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Biochemical and Cellular Investigation of Vitreoscilla Hemoglobin (VHb) Variants Possessing Efficient Peroxidase Activity

  • Isarankura-Na-Ayudhya, Chartchalerm (Department of Clinical Microbiology, Faculty of Medical Technology, Mahidol University) ;
  • Tansila, Natta (Department of Clinical Microbiology, Faculty of Medical Technology, Mahidol University) ;
  • Worachartcheewan, Apilak (Department of Clinical Microbiology, Faculty of Medical Technology, Mahidol University) ;
  • Bulow, Leif (Department of Pure and Applied Biochemistry, Center for Chemistry and Chemical Engineering, Lund University) ;
  • Prachayasittikul, Virapong (Department of Clinical Microbiology, Faculty of Medical Technology, Mahidol University)
  • Received : 2009.08.30
  • Accepted : 2009.10.31
  • Published : 2010.03.31
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Abstract

Peroxidase-like activity of Vitreoscilla hemoglobin (VHb) has been recently disclosed. To maximize such activity, two catalytically conserved residues (histidine and arginine) found in the distal pocket of peroxidases have successfully been introduced into that of the VHb. A 15-fold increase in catalytic constant ($k_{cat}$) was obtained in P54R variant,which was presumably attributable to the lower rigidity and higher hydrophilicity of the distal cavity arising from substitution of proline to arginine. None of the modifications altered the affinity towards either $H_2O_2$ or ABTS substrate. Spectroscopic studies revealed that VHb variants harboring the T29H mutation apparently demonstrated a spectral shift in both ferric and ferrous forms (406-408 to 411 nm, and 432 to 424-425 nm, respectively). All VHb proteins in the ferrous state had a $\lambda_{soret}$ peak at ~419 nm following the carbon monoxide (CO) binding. Expression of the P54R mutant mediated the downregulation of iron superoxide dismutase (FeSOD) as identified by two-dimensional gel electrophoresis (2-DE) and peptide mass fingerprinting (PMF). According to the high peroxidase activity of P54R, it could effectively eliminate autoxidation-derived $H_2O_2$, which is a cause of heme degradation and iron release. This decreased the iron availability and consequently reduced the formation of the $Fe^{2+}$-ferric uptake regulator protein ($Fe^{2+}$-Fur), an inducer of FeSOD expression.

Keywords

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