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Exploring class III cellobiose dehydrogenase: sequence analysis and optimized recombinant expression.
Angela Giorgianni1, Alice Zenone1, Leander Sützl1
1Department of Food Science and Technology, Institute of Food Technology, BOKU University, Muthgasse 18, Vienna, 1190, Austria.
Microbial Cell Factories
|May 23, 2024
Summary
This study successfully expressed and characterized a novel class III cellobiose dehydrogenase (CDH) from Fusarium solani. This finding expands our understanding of CDH enzymes and their potential in biomass degradation.
Area of Science:
- Biochemistry
- Enzymology
- Molecular Biology
Background:
- Cellobiose dehydrogenase (CDH) is a key fungal oxidoreductase in plant biomass degradation, acting synergistically with lytic polysaccharide monooxygenases (LPMOs).
- CDHs are crucial for efficient cellulose and hemicellulose depolymerization, supporting sustainable biofuel and chemical production.
- Four CDH classes exist, but only classes I and II have been biochemically characterized.
Purpose of the Study:
- To identify and biochemically characterize uncharacterized class III CDH sequences.
- To investigate the evolutionary diversification of CDHs into four distinct classes.
- To explore the potential of CDHs in oxidative depolymerization of polysaccharides.
Main Methods:
- Comprehensive database search for putative class III CDH sequences.
- Sequence similarity network and phylogenetic analyses to cluster CDH sequences.
- Recombinant expression of selected cdhIII genes in Komagataella phaffii, followed by optimization and large-scale production.
Main Results:
- 1237 putative class III CDH sequences were identified and phylogenetically analyzed.
- A promising class III CDH gene from Fusarium solani (FsCDH) was selected for expression.
- Purified FsCDH demonstrated biochemical properties similar to characterized CDH classes.
Conclusions:
- Class III CDHs are catalytically active and share key properties with class I and II CDHs.
- The established expression and purification strategy facilitates further biochemical characterization of class III CDHs.
- This research deepens the understanding of CDH evolution and their biocatalytic applications with LPMOs.
