Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub


    The kinetics of Mn3+- oxalate formation and decay were investigated in reactions catalyzed by manganese peroxidase (MnP) from the basiomycete Ceriporiopsis subvermispora in the absence of externally added hydrogen peroxide. A characteristic lag observed in the formation of this complex was shortened by glyoxylate or catalytic amounts of Mn3+ or hydrogen peroxide. MnP titers had a minor effect on this lag and did not influence the decay rate of the complex. In contrast, Mn2+ and oxalate drastically affected maximal concentrations of the Mn3+- oxalate complex formed, the decay of which was accelerated at high Mn2+ levels. The highest concentration of complex was obtained at pH 4.0, whereas an inverse relationship was found between the pH of the reaction and the decay rate of the complex with MnP present. In the absence of MnP, the best fit for the decay kinetics of the complex gave an order of 3/2 at concentrations in the range of 30-100 *M, with a k obs = 0.012 min-1 M-0.5 at pH 4.0. The rate constant increases at lower pH values and decreases at high oxalate concentrations. The physiological relevance of these findings is discussed.

    Publication Notes

    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.


    Urzua, Ulises.; Kersten, Philip J.; Vicuna, Rafael. 1998. Kinetics of Mn3+-oxalate formation and decay in reactions catalyzed by manganese peroxidase of Ceriporiopsis subvermispora. Archives of biochemistry and biophysics. Vol. 360, no. 2 (Dec. 15, 1998).:p. 215-222 : ill.


    Wood destroying fungi, Chemical reactions, Decay, Hydrogen peroxide., Formation, Kinetics, Catalytic activity, Ceriporiopsis subvermispora, Manganese peroxidase, Mn3+-oxalate

    Related Search

    XML: View XML
Show More
Show Fewer
Jump to Top of Page