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Abstract

Manganese peroxidase generally mediates the oxidation of Mn2+ to Mn3+ with H2O2 as an oxidant. Several manganese peroxidases purified from different lignin-degrading fungi were found to mediate a fluoride-dependent conversion of organic substrates such as monochlorodimedone or 2,6-dimethoxyphenol in the absence of manganese ions. Using the manganese peroxidase MnP-1 from Bjerkandera adusta strain lid I, these fluoride-dependent reactions were studied with respect to different substrates converted, reaction products, and kinetic properties to shed some light on the reaction mechanism of manganese peroxidase. The analysis of the reaction products formed from monochlorodimedone and 2,6-dimethoxyphenol showed that the substrates were oxidized rather than fluorinated. The addition of fluoride to MnP-1 resulted in altered absorption spectra, indicating a coordinative binding of fluoride or HF to the heme iron; the fluoride:heme stoichiometry was determined to be 1:1 and the K-D value to be similar to 2.5 in M at pH 3.4. The high K-D value indicates weak binding of fluoride to the heme. Fluoride appeared to act as a partially competitive inhibitor with respect to hydrogen peroxide for binding to the heme as the sixth ligand. From the findings, a putative model for the fluoride-dependent reaction was developed. The data were interpreted to indicate that changes of the reaction center of manganese peroxidase as, for example, caused by fluoride binding may lead to the oxidation of organic compounds in the absence of manganese by opening a long-range electron transfer pathway.