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The white-rot fungus Cerrena unicolor strain 137 produces two laccase isoforms with different physico-chemical and catalytic properties


Cerrena unicolor secreted two laccase isoforms with different characteristics during the growth in liquid media. In a synthetic low-nutrient nitrogen glucose medium (Kirk medium), high amounts of laccase (4,000 U l−1) were produced in response to Cu2+. Highest laccase levels (19,000 U l−1) were obtained in a complex tomato juice medium. The isoforms (Lacc I, Lacc II) were purified to homogeneity with an overall yield of 22%. Purification involved ultrafiltration and Mono Q separation. Lacc I and II had Mw of 64 and 57 kDa and pI of 3.6 and 3.7, respectively. Both isoforms had an absorption maximum at 608 nm but different pH optima and thermal stability. Optimum pH ranged from 2.5 to 5.5 depending on the substrate. The pH optima of Lacc II were always higher than those of Lacc I. Both laccases were stable at pH 7 and 10 but rapidly lost activity at pH 3. Their temperature optimum was around 60°C, and at 5°C they still reached 30% of the maximum activity. Lacc II was the more thermostable isoform that did not lose any activity during 6 months storage at 4°C. Kinetic constants (Km, kcat) were determined for 2,2′-azino-bis(3-ethylthiazoline-6-sulfonate) (ABTS), 2,6-dimethoxyphenol and syringaldazine.

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This research was supported by the German Environmental Foundation (Deutsche Bundesstiftung Umwelt, grant number AZ 21000/227), the Nowicky Foundation (Poland) and the administration of the International Graduate School Zittau (RD' in Dr. R. Konschak). We thank U. Schneider for excellent technical assistance and C. Liers for useful discussions.

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Correspondence to Anna Michniewicz.

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Michniewicz, A., Ullrich, R., Ledakowicz, S. et al. The white-rot fungus Cerrena unicolor strain 137 produces two laccase isoforms with different physico-chemical and catalytic properties. Appl Microbiol Biotechnol 69, 682–688 (2006). https://doi.org/10.1007/s00253-005-0015-9

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  • Laccase Activity
  • Laccase Production
  • Veratryl Alcohol
  • Tomato Juice
  • Syringaldazine