Mechanism of non-phenolic substrate oxidation by the fungal laccase Type 1 copper site from Trametes versicolor : the case of benzo[ a ]pyrene and anthracene.

Laccases (EC 1.10.3.2) are multicopper oxidases with the capability to oxidize diverse phenolic and non-phenolic substrates. While the molecular mechanism of their activity towards phenolic substrates is well-established, their reactivity towards non-phenolic substrates, such as polycyclic aromatic hydrocarbons (PAHs), remains unclear. To elucidate the oxidation mechanism of PAHs, particularly the activation mechanism of the sp 2 aromatic C-H bond, we conducted a density functional theory investigation on the oxidation of two PAHs (anthracene and benzo[ a ]pyrene) using an extensive model of the T1 copper catalytic site of the fungal laccase from Trametes versicolor .