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Efficient production of laccases by Trametes sp. AH28-2 in cocultivation with a Trichoderma strain

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Abstract

A biocontrol fungus isolated from rotting wood was identified as a Trichoderma strain (named as Trichoderma sp. ZH1) by internal transcribed spacer (ITS) sequences of rRNA genes. The laccase yield of Trametes sp. AH28-2 in cocultivation with Trichoderma sp. ZH1 reached 6,210 U l−1, approximately identical to those induced by toxic aromatic inducers. Cocultures maintained 60–70 % of their highest laccase activity obtained at 5 days after inoculation of the biocontrol fungus, at least for 20 days. Furthermore, a novel laccase isozyme (LacC) was obtained through the fungal interactions. The molecular weight of LacC is about 64 kDa, and its isoelectric point is 6.6. The temperature and pH optimum for LacC to oxidize guaiacol are 55 °C and 5.0, respectively. LacC is stable both at 60 °C and pH 4.0–8.0. Furthermore, the K m values of LacC for various substrates were also determined. Our work demonstrates a safe strategy for the production of industrial laccases, instead of the traditional method of chemical induction.

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Acknowledgements

This work was supported by grants from the National Natural Sciences Foundation of China (30370045, 30470056), the Science & Technology Foundation of Distinguished Young Scholars of Anhui Province (04043048, 05023057), and the Innovative Research Team of 211 Project in Anhui University (02203109).

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Correspondence to Y. Z. Xiao.

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Zhang, H., Hong, Y.Z., Xiao, Y.Z. et al. Efficient production of laccases by Trametes sp. AH28-2 in cocultivation with a Trichoderma strain. Appl Microbiol Biotechnol 73, 89–94 (2006). https://doi.org/10.1007/s00253-006-0430-6

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Keywords

  • Internal Transcribe Spacer
  • Trichoderma
  • Guaiacol
  • Laccase Activity
  • Laccase Production