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2-Chloro-1,4-dimethoxybenzene (2Cl-14DMB) is a natural compound produced de novo by several white rot fungi. This chloroaromatic metabolite was identified as a cofactor superior to veratryl alcohol (VA) in the oxidation of anisyl alcohol (AA) by lignin peroxidase (LiP). Our results reveal that good LiP substrates, such as VA and tryptophan, are comparatively poor cofactors in the oxidation of AA. Furthermore, we show that a good cofactor does not necessarily serve a role in protecting LiP against H(2)O(2) inactivation. 2Cl-14DMB was not a direct mediator of AA oxidation, since increasing AA concentrations did not inhibit the oxidation of 2Cl-14DMB at all. However, the high molar ratio of anisaldehyde formed to 2Cl-14DMB consumed, up to 13:1, indicates that a mechanism which recycles the cofactor is present.

2-Chloro-1,4-Dimethoxybenzene as a Novel Catalytic Cofactor for Oxidation of Anisyl Alcohol by Lignin Peroxidase