Abstract
By combining gene design and heterologous over-expression of Rhodotorula gracilis d-amino acid oxidase (RgDAO) in Pichia pastoris, enzyme production was enhanced by one order of magnitude compared to literature benchmarks, giving 350 kUnits/l of fed-batch bioreactor culture with a productivity of 3.1 kUnits/l h. P. pastoris cells permeabilized by freeze-drying and incubation in 2-propanol (10% v/v) produce a highly active (1.6 kUnits/g dry matter) and stable oxidase preparation. Critical bottlenecks in the development of an RgDAO catalyst for industrial applications have been eliminated.
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Acknowledgments
The authors would like to thank Thorsten Bachler and Margaretha Schiller for their excellent technical support. The Österreichische Forschungsförderungsgesellschaft mbH (FFG), the provinces of Vienna, Styria and Tyrol as well as the Steirische Wirtschaftsförderungsgesellschaft mbH (SFG) and Ingenza Ltd. are acknowledged for financial support. BN and JN acknowledge the Slovak-Austrian travel project SK-AT-0024-08.
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Abad, S., Nahalka, J., Winkler, M. et al. High-level expression of Rhodotorula gracilis d-amino acid oxidase in Pichia pastoris . Biotechnol Lett 33, 557–563 (2011). https://doi.org/10.1007/s10529-010-0456-9
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DOI: https://doi.org/10.1007/s10529-010-0456-9