Regioselective Hydroxylation in the Production of 25‐Hydroxyvitamin D by Coprinopsis cinerea Peroxygenase

Abstract

AbstractMonohydroxylated metabolites of vitamin D3 (cholecalciferol) and vitamin D2 (ergocalciferol), generically known as 25‐hydroxycalciferol, are better for several diseases, and other applications, than vitamin D (calciferol). This work describes a novel biotechnological approach for the preparation of 25‐hydroxycalciferols, starting from readily available cholecalciferol and ergocalciferol. This approach enables the regioselective (100 %) hydroxylation of these compounds (at the C‐25 position) under mild and environmentally friendly conditions by using a peroxidase from the fungus Coprinopsis cinerea (gene model CC1G_08427T0 from the sequenced genome), which catalyzes monooxygenation with H2O2 as the only co‐substrate (peroxygenase). Hydroxylation of cholecalciferol and ergocalciferol is a true peroxygenation, as demonstrated by incorporation of 18O from H218O2 into the products. The peroxygenase has additional advantages related to its recombinant nature, enabling enzyme engineering and low‐cost overexpression in an industrial host. Therefore, the peroxygenase is a promising biocatalyst for the production of vitamin D active metabolites.