Production and Characterization of Laccase from Botrytis cinerea 61-34.

Applied and Environmental Microbiology
D SlomczynskiS W Tanenbaum

Abstract

An isolate of Botrytis cinerea (strain 61-34) constitutively expresses substantial amounts of extracellular laccase on a defined growth medium. The enzyme has been purified to homogeneity by a facile operational sequence, the last stage of which involves hydrophobic interaction chromatography. By these means, over 80 mg of laccase liter(sup-1) can be obtained from aerated fermentor reaction broths. The enzyme, with an estimated M(infr) of 74,000 and pI of 4.0, is a monomeric glycoprotein containing 49% carbohydrate predominantly as hexose. With 2,6-dimethoxyphenol, it exhibits a pH optimum of 3.5 and a temperature optimum of 60(deg)C, and its K(infm) is 100 (mu)M. The purified enzyme with this substrate has a specific activity of 9.1 mkat mg of protein(sup-1). Taken together with a broad substrate range and its stability in 4% sodium dodecyl sulfate or 2 M urea solutions, several biotechnology transfers are suggested.

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