The VPs (versatile peroxidases) secreted by white-rot fungi are involved in the natural decay of lignin. In the present study, a fusion gene containing the VP from Pleurotus eryngii was subjected to six rounds of directed evolution, achieving a level of secretion in Saccharomyces cerevisiae (21 mg/l) as yet unseen for any ligninolytic peroxidase. The evolved variant for expression harboured four mutations and increased its total VP activity 129-fold. The signal leader processing by the STE13 protease at the Golgi compartment changed as a consequence of overexpression, retaining the additional N-terminal sequence Glu-Ala-Glu-Ala that enhanced secretion. The engineered N-terminally truncated variant displayed similar biochemical properties to those of the non-truncated counterpart in terms of kinetics, stability and spectroscopic features. Additional cycles of evolution raised the T50 8°C and significantly increased the enzyme's stability at alkaline pHs. In addition, the Km for H2O2 was enhanced up to 15-fold while the catalytic efficiency was maintained, and there was an improvement in peroxide stability (with half-lives for H2O2 of 43 min at a H2O2/enzyme molar ratio of 4000:1). Overall, the directed evolution approach described provides a set of strategies for selecting VPs with improvements in secretion, activity and stability.
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Research Article|
December 14 2011
Directed evolution of a temperature-, peroxide- and alkaline pH-tolerant versatile peroxidase
Eva Garcia-Ruiz;
Eva Garcia-Ruiz
*Department of Biocatalysis, Institute of Catalysis, CSIC, Cantoblanco, 28049 Madrid, Spain
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David Gonzalez-Perez;
David Gonzalez-Perez
*Department of Biocatalysis, Institute of Catalysis, CSIC, Cantoblanco, 28049 Madrid, Spain
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Francisco J. Ruiz-Dueñas;
Francisco J. Ruiz-Dueñas
†Center for Biological Investigations, CSIC, Ramiro de Maeztu 9, 28040 Madrid, Spain
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Angel T. Martínez;
Angel T. Martínez
†Center for Biological Investigations, CSIC, Ramiro de Maeztu 9, 28040 Madrid, Spain
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Miguel Alcalde
Miguel Alcalde
1
*Department of Biocatalysis, Institute of Catalysis, CSIC, Cantoblanco, 28049 Madrid, Spain
1To whom correspondence should be addressed (email malcalde@icp.csic.es).
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Publisher: Portland Press Ltd
Received:
July 05 2011
Revision Received:
October 07 2011
Accepted:
October 07 2011
Accepted Manuscript online:
October 07 2011
Online ISSN: 1470-8728
Print ISSN: 0264-6021
© The Authors Journal compilation © 2012 Biochemical Society
2012
Biochem J (2012) 441 (1): 487–498.
Article history
Received:
July 05 2011
Revision Received:
October 07 2011
Accepted:
October 07 2011
Accepted Manuscript online:
October 07 2011
Citation
Eva Garcia-Ruiz, David Gonzalez-Perez, Francisco J. Ruiz-Dueñas, Angel T. Martínez, Miguel Alcalde; Directed evolution of a temperature-, peroxide- and alkaline pH-tolerant versatile peroxidase. Biochem J 1 January 2012; 441 (1): 487–498. doi: https://doi.org/10.1042/BJ20111199
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