... microorganisms, and in mammals, inverte-brates and plants. Tyrosinase is a mono-oxygenase and a bifunctional enzyme that catalyzes the o-hydroxyla-tion of monophenols and subsequent oxidation of o-diphenols ... Buchert1 and Kristiina Kruus11 VTT Technical Research Centre of Finland, Espoo, Finland2 Protein Chemistry Research Group and Core Facility, Institute of Biotechnology, University of Helsinki, ... assay.Stereospecificity and substrate specificityThe stereospecificity of T. reesei TYR2 was studied byfollowing the activities on 15 mml-dopa, dl-dopa and d-dopa and 2.5 mml-dopa, dl-dopa and d-tyrosine, and the...