1921
Volume 87, Issue 1
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645

Abstract

Abstract.

Pyrazinamidase of catalyzes the conversion of pyrazinamide to the active molecule pyrazinoic acid. Reduction of pyrazinamidase activity results in a level of pyrazinamide resistance. Previous studies have suggested that pyrazinamidase has a metal-binding site and that a divalent metal cofactor is required for activity. To determine the effect of divalent metals on the pyrazinamidase, the recombinant wild-type pyrazinamidase corresponding to the H37Rv pyrazinamide-susceptible reference strain was expressed in with and without a carboxy terminal. His-tagged pyrazinamidase was inactivated by metal depletion and reactivated by titration with divalent metals. Although Co, Mn, and Zn restored pyrazinamidase activity, only Co enhanced the enzymatic activity to levels higher than the wild-type pyrazinamidase. Cu, Fe, Fe, and Mg did not restore the activity under the conditions tested. Various recombinant mutated pyrazinamidases with appropriate folding but different enzymatic activities showed a differential pattern of recovered activity. X-ray fluorescence and atomic absorbance spectroscopy showed that recombinant wild-type pyrazinamidase expressed in most likely contained Zn. In conclusion, this study suggests that pyrazinamidase is a metalloenzyme that is able to coordinate several ions, but , it is more likely to coordinate Zn. However, , the metal-depleted enzyme could be reactivated by several divalent metals with higher efficiency than Zn.

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  • Received : 11 Oct 2010
  • Accepted : 26 Jan 2012

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