Engineering chloroperoxidase for activity and stability

Random mutagenesis of Caldariomyces fumago was carried out to produce a chl oroperoxidase (CPO) with enhanced activity in mixtures of aqueous buffers a nd organic cosolvents. A mutant CPO with a 3,4-fold increased activity in 4 0% aqueous tert-butyl alcohol was obtained. A CPO-surfactant conjugate, prepared by colyophilisation, mediated the oxid ation of thioanisole to its (R)-sulfoxide by TBHP in water-saturated isooct ane, Copolymerisation of CPO and a toluenediisocyanate prepolymer resulted in a stable preparation that mediated the oxidation of indole to 2-oxindole in a range of organic solvents. The highest yield was obtained in 1-octano l. (C) 2001 Elsevier Science B.V. All rights reserved.