Abstract
Laccases have numerous biotechnological applications, among them food processing. The widespread use of laccases has increased the demand for an inexpensive and safe source of recombinant enzyme. We explored the use of a rice-based system for the production of two fungal laccases derived from the ascomycete Melanocarpus albomyces and the basidiomycete Pycnoporus cinnabarinus. High-expression levels of active recombinant laccases were achieved by targeting expression to the endosperm of rice seeds. The laccase cDNAs were fused to a plant-derived signal sequence for targeting to the secretory pathway, and placed under the control of a constitutive seed-specific promoter fused to an intron for enhanced expression. This construct enabled the recovery of on average 0.1–1% of soluble laccase in total soluble proteins (TSP). The highest yields of recombinant laccases obtained in rice seeds were 13 and 39 ppm for riceMaL and ricePycL, respectively. The rice-produced laccases were purified and characterized. The wild-type and the recombinant proteins showed similar biochemical features in terms of molecular mass, pI, temperature and optimal pH and the N-terminus was correctly processed. Although presenting lower kinetic parameters, the rice-produced laccases were also suitable for the oxidative cross-linking of a food model substrate [maize-bran feruloylated arabinoxylans (AX)].
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Abbreviations
- ABTS:
-
2,2′-Azino-bis-[3-ethylthiazoline-6-sulphonate]
- AX:
-
Arabinoxylans
- 2,6-DMP:
-
2,6-Dimethoxyphenol
- GRAS:
-
Generally recognized as safe
- riceMaL:
-
Recombinant Melanocarpus albomyces laccase produced in rice
- rMaL:
-
Recombinant M. albomyces laccase produced in Trichoderma reesei
- MaL:
-
Native M. albomyces laccase
- ricePycL:
-
Recombinant Pycnoporus cinnabarinus laccase produced in rice
- PycL:
-
Native Pycnoporus cinnabarinus laccase
- TSP:
-
Total soluble proteins
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Acknowledgements
We are deeply grateful to David Navarro (UMR 1163 INRA, Marseille, France), Outi Liehunen and Birgit Hillebrandt (VTT, Finland) for technical assistance, Christophe Flaudrops (AFMB, CNRS, Marseille, France) for mass spectrometry analysis and Willem Broekaert and Yves Hatzfeld (CropDesign NV) for their valuable contribution in construct design. This work has been carried out with financial support from the Commission of the European Communities, specifically the RTD programme “Quality of Life and Management of Living Resources”, proposal number QLK1-2002-02208 “Novel cross-linking enzymes and their consumer acceptance for structure engineering of foods”, acronym CROSSENZ. It does not reflect its views and in no way anticipates the Commission’s future policy in this area.
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de Wilde, C., Uzan, E., Zhou, Z. et al. Transgenic rice as a novel production system for Melanocarpus and Pycnoporus laccases. Transgenic Res 17, 515–527 (2008). https://doi.org/10.1007/s11248-007-9124-9
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DOI: https://doi.org/10.1007/s11248-007-9124-9