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Enzymatic production of atranorin: a component of the oak moss absolute by immobilized lichen cells

Cells of the lichen, Evernia prunastri, immobilized in calcium alginate were able to produce the depside atranorin from acetate. The synthesis of the depside was enhanced by molecular oxygen and NADH. This enhancement suggested the participation of an oxidase and an alcohol dehydrogenase to produce an aldehyde‐substituted phenolic acid, hematommic acid, as the most probable precursor of atranorin. The participation of both enzymes was confirmed by loading immobilized cells with sodium azide, an inhibitor of several metallo‐oxidases, and pyrazole, an inhibitor of alcohol dehydrogenase, which impeded atranorin production and accumulated β‐methyl orsellinate (after azide loading) or its alcohol derivative (after pirazole treatment).