Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12779/6550
Title: Basidiomycete DyPs: Genomic diversity, structural–functional aspects, reaction mechanism and environmental significance
Authors: Linde, Dolores
Ruiz Dueñas, Francisco J.
Fernández Fueyo, Elena
Guallar, Victor
Hammel, Kenneth E.
Pogni, Rebecca 
Martínez, Angel T.
Keywords: Dye-decolorizing peroxidases CDE superfamily Molecular structure Reaction mechanism Catalytic tryptophan Long-range electron transfer Substituted anthraquinone breakdown Ligninolysis
Issue Date: 2015
Project: None 
Journal: ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS
Abstract: 
The first enzyme with dye-decolorizing peroxidase (DyP) activity was described in 1999 from an arthroconidial culture of the fungus Bjerkandera adusta. However, the first DyP sequence had been deposited three years before, as a peroxidase gene from a culture of an unidentified fungus of the family Polyporaceae (probably Irpex lacteus). Since the first description, fewer than ten basidiomycete DyPs have been purified and characterized, but a large number of sequences are available from genomes. DyPs share a general fold and heme location with chlorite dismutases and other DyP-type related proteins (such as Escherichia coli EfeB), forming the CDE superfamily. Taking into account the lack of an evolutionary relationship with the catalase–peroxidase superfamily, the observed heme pocket similarities must be considered as a convergent type of evolution to provide similar reactivity to the enzyme cofactor. Studies on the Auricularia auricula-judae DyP showed that high-turnover oxidation of anthraquinone type and other DyP substrates occurs via long-range electron transfer from an exposed tryptophan (Trp377, conserved in most basidiomycete DyPs), whose catalytic radical was identified in the H2O2-activated enzyme. The existence of accessory oxidation sites in DyP is suggested by the residual activity observed after site-directed mutagenesis of the above tryptophan. DyP degradation of substituted anthraquinone dyes (such as Reactive Blue 5) most probably proceeds via typical one-electron peroxidase oxidations and product breakdown without a DyP-catalyzed hydrolase reaction. Although various DyPs are able to break down phenolic lignin model dimers, and basidiomycete DyPs also present marginal activity on nonphenolic dimers, a significant contribution to lignin degradation is unlikely because of the low activity on high redox-potential substrates.
Description: 
204999
URI: http://hdl.handle.net/20.500.12779/6550
ISSN: 0003-9861
DOI: 10.1016/j.abb.2015.01.018
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