1. β-Glucosidase BGL1 from Coprinopsis cinerea Exhibits a Distinctive Hydrolysis and Transglycosylation Activity for Application in the Production of 3-O-β-d-Gentiobiosyl-d-laminarioligosaccharides.
- Author
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Kang L, Zhang X, Wang R, Liu C, Yi L, Liu Z, Zhang Z, and Yuan S
- Subjects
- Agaricales chemistry, Agaricales genetics, Amino Acid Sequence, Disaccharides chemistry, Fungal Proteins genetics, Fungal Proteins metabolism, Glycosylation, Hydrolysis, Kinetics, Molecular Structure, Oligosaccharides chemistry, Substrate Specificity, beta-Glucosidase genetics, beta-Glucosidase metabolism, Agaricales enzymology, Disaccharides metabolism, Fungal Proteins chemistry, Oligosaccharides metabolism, beta-Glucosidase chemistry
- Abstract
We previously reported that β-glucosidase BGL1 at low concentration (15 μg mL
-1 ) from Coprinopsis cinerea exhibited hydrolytic activity only toward laminarioligosaccharides but not toward cellooligosaccharides and gentiobiose. This study shows that BGL1 at high concentration (200 μg mL-1 ) also hydrolyzed cellobiose and gentiobiose, which accounted for only 0.83 and 2.05% of its activity toward laminaribiose, respectively. Interestingly, BGL1 at low concentration (1.5 μg mL-1 ) showed transglycosylation but BGL1 at high concentration (200 μg mL-1 ) did not. BGL1 utilizes only laminarioligosaccharides but not glucose, gentiobiose, and cellobiose to synthesize the higher oligosaccharides. BGL1 transferred one glucosyl residue from substrate laminarioligosaccharide to another laminarioligosaccharide as an acceptor in a β(1 → 3) or β(1 → 6) fashion to produce higher laminarioligosaccharides or 3-O-β-d-gentiobiosyl-d-laminarioligosaccharides. The BGL1-digested laminaritriose exhibited approximately 90% enhancement in the anti-oxidant activity compared to that of untreated laminaritriose, implying a potential application of BGL1-based transglycosylation for the production of high value-added rare oligosaccharides.- Published
- 2019
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