Studies on inactivation and stabilization of manganese peroxidase from Trametes versicolor

Bermek H., Li K., Eriksson K.

8th International Conference on Biotechnology in the Pulp and Paper Industry, Helsinki, Finland, 4 - 08 June 2001, vol.21, pp.141-149 identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 21
  • Doi Number: 10.1016/s0921-0423(02)80016-8
  • City: Helsinki
  • Country: Finland
  • Page Numbers: pp.141-149
  • Istanbul Technical University Affiliated: No

Abstract

High concentrations of H2O2 cause inactivation of manganese peroxidase (MnP). The mechanism of this inactivation has been investigated. A method for stabilization of MnP used for pulp bleaching in the presence of high concentrations of H2O2 has been developed. It was demonstrated that formation of the inactive form of MnP (Compound III) is the major reason for the inactivation in which hydroxyl free radicals or superoxide anion radicals are not involved. It was also found that 1-hydroxybenzotriazole, 2,2,6,6-tetramethyl-1-piperidinyloxy free radical, violuric acid, 3-hydroxy-1,2,3-benzotriazin-4-(3H)-one and chlorpromazine stabilized MnP. The stabilizing effect by 1-hydroxybenzotriazole is due to the conversion of the inactive Compound III to the native enzyme.