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PubMed Publications| Keyword search (4,163 papers available) |  |
"Karppi J" Authored Publications:
| Title | Authors | PubMed ID | |
|---|---|---|---|
| 1 | Substrate specificity mapping of fungal CAZy AA3_2 oxidoreductases | Zhao H; Karppi J; Mototsune O; Poshina D; Svartström J; Nguyen TTM; Vo TM; Tsang A; Master E; Tenkanen M; | 38539167 CSFG |
| 2 | Characterization of a novel AA3_1 xylooligosaccharide dehydrogenase from Thermothelomyces myriococcoides CBS 398.93 | Zhao H; Karppi J; Nguyen TTM; Bellemare A; Tsang A; Master E; Tenkanen M; | 36476312 CSFG |
| Title: | Characterization of a novel AA3_1 xylooligosaccharide dehydrogenase from Thermothelomyces myriococcoides CBS 398.93 | ||||
| Authors: | Zhao H, Karppi J, Nguyen TTM, Bellemare A, Tsang A, Master E, Tenkanen M | ||||
| Link: | https://pubmed.ncbi.nlm.nih.gov/36476312/ | ||||
| DOI: | 10.1186/s13068-022-02231-w | ||||
| Publication: | Biotechnology for biofuels and bioproducts | ||||
| Keywords: | AA3_1; CAZy AA3; Cellobiose dehydrogenase; Thermothelomyces myriococcoides; Xylooligosaccharide dehydrogenase; | ||||
| PMID: | 36476312 | Category: | Date Added: | 2022-12-08 | |
| Dept Affiliation: |
CSFG
1 Department of Food and Nutrition, University of Helsinki, Helsinki, Finland. hongbo.zhao@helsinki.fi. 2 Department of Food and Nutrition, University of Helsinki, Helsinki, Finland. 3 Centre for Structural and Functional Genomics, Concordia University, 7141 Sherbrooke Street West, Montreal, QC, H4B 1R6, Canada. 4 Department of Bioproducts and Biosystems, Aalto University, Espoo, Finland. 5 Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, ON, Canada. |
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Description: |
Background: The Carbohydrate-Active enZymes (CAZy) auxiliary activity family 3 (AA3) comprises flavin adenine dinucleotide-dependent (FAD) oxidoreductases from the glucose-methanol-choline (GMC) family, which play auxiliary roles in lignocellulose conversion. The AA3 subfamily 1 predominantly consists of cellobiose dehydrogenases (CDHs) that typically comprise a dehydrogenase domain, a cytochrome domain, and a carbohydrate-binding module from family 1 (CBM1). Results: In this work, an AA3_1 gene from T. myriococcoides CBS 398.93 encoding only a GMC dehydrogenase domain was expressed in Aspergillus niger. Like previously characterized CDHs, this enzyme (TmXdhA) predominantly accepts linear saccharides with ß-(1 ? 4) linkage and targets the hydroxyl on the reducing anomeric carbon. TmXdhA was distinguished, however, by its preferential activity towards xylooligosaccharides over cellooligosaccharides. Amino acid sequence analysis showed that TmXdhA possesses a glutamine at the substrate-binding site rather than a threonine or serine that occupies this position in previously characterized CDHs, and structural models suggest the glutamine in TmXdhA could facilitate binding to pentose sugars. Conclusions: The biochemical analysis of TmXdhA revealed a catalytic preference for xylooligosaccharide substrates. The modeled structure of TmXdhA provides a reference for the screening of oxidoreductases targeting xylooligosaccharides. We anticipate TmXdhA to be a good candidate for the conversion of xylooligosaccharides to added-value chemicals by its exceptional catalytic ability. |
