English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/128777
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Title

Correction: Improving the pH-stability of Versatile Peroxidase by Comparative Structural Analysis with a Naturally-Stable Manganese Peroxidase

AuthorsSáez-Jiménez, Verónica ; Fernández-Fueyo, Elena ; Medrano, Francisco Javier; Romero, Antonio ; Martínez, Ángel T. ; Ruiz-Dueñas, F. J.
KeywordsLigninolytic peroxidase
pH stability improvement
Protein engineering
Site-directed mutagenesis
Issue Date12-Nov-2015
PublisherPublic Library of Science
CitationPLOS ONE 10(11): e0143267 (2015)
AbstractVersatile peroxidase (VP) from the white-rot fungus Pleurotus eryngii is a high redox potential peroxidase of biotechnological interest able to oxidize a wide range of recalcitrant substrates including lignin, phenolic and non-phenolic aromatic compounds and dyes. However, the relatively low stability towards pH of this and other fungal peroxidases is a drawback for their industrial application. A strategy based on the comparative analysis of the crystal structures of VP and the highly pH-stable manganese peroxidase (MnP4) from Pleurotus ostreatus was followed to improve the VP pH stability. Several interactions, including hydrogen bonds and salt bridges, and charged residues exposed to the solvent were identified as putatively contributing to the pH stability of MnP4. The eight amino acid residues responsible for these interactions and seven surface basic residues were introduced into VP by directed mutagenesis. Furthermore, two cysteines were also included to explore the effect of an extra disulfide bond stabilizing the distal Ca2+ region. Three of the four designed variants were crystallized and new interactions were confirmed, being correlated with the observed improvement in pH stability. The extra hydrogen bonds and salt bridges stabilized the heme pocket at acidic and neutral pH as revealed by UV-visible spectroscopy. They led to a VP variant that retained a significant percentage of the initial activity at both pH 3.5 (61% after 24 h) and pH 7 (55% after 120 h) compared with the native enzyme, which was almost completely inactivated. The introduction of extra solventexposed basic residues and an additional disulfide bond into the above variant further improved the stability at acidic pH (85% residual activity at pH 3.5 after 24 h when introduced separately, and 64% at pH 3 when introduced together). The analysis of the results provides a rational explanation to the pH stability improvement achieved.
DescriptionErrors in the Funding section.
Publisher version (URL)http://dx.doi.org/10.1371/journal.pone.0143267
URIhttp://hdl.handle.net/10261/128777
DOI10.1371/journal.pone.0143267
E-ISSN1932-6203
ReferencesSáez-Jiménez, Verónica; Fernández-Fueyo, Elena; Medrano, Francisco Javier; Romero, Antonio; Martínez, Ángel T.; Ruíz-Dueñas, Francisco Javier. Improving the pH-stability of Versatile Peroxidase by Comparative Structural Analysis with a Naturally-Stable Manganese Peroxidase. http://dx.doi.org/10.1371/journal.pone.0140984 . http://hdl.handle.net/10261/125164
Appears in Collections:(CIB) Artículos
Files in This Item:
File Description SizeFormat 
pH-stability_Saez.pdf105,94 kBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 

Related articles:


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.