Characterization of a novel thermostable glucose-tolerant GH1 β-glucosidase from the hyperthermophile Ignisphaera aggregans and its application in the efficient production of baohuoside I from icariin and total epimedium flavonoids.
In: Bioorganic chemistry, Jg. 104 (2020-11-01), S. 104296
Online
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Zugriff:
The minor flavonoid baohuoside I from Herba epimedii has better bioactivities than its precursor compounds icariin and other major epimedium flavonoids. In this study, a novel β-glucosidase gene (Igag_0940) was cloned and expressed to improve the conversion efficiency in the process of baohuoside I production. For the first time, the recombinant IagBgl1 was purified and then identified uniquely as a trimer in GH 1 family protein from Archaea. The maximum activity of recombinant IagBgl1 was exhibited at 95 °C, pH 6.5, and it retained more than 70% after incubation at 90 °C for 4 h. IagBgl1 had a high catalytic activity towards icariin with a K cat /K m ratio of 488.19 mM -1 ·s -1 . Under optimized conditions (65 °C, pH 6.5, 0.8 U/mL enzyme, and 90 min), 10 g/L icariin was transformed into 7.564 g/L baohuoside I with a molar conversion of 99.48%. Meanwhile, 2.434 g/L baohuoside I was obtained from 10 g/L total epimedium flavonoids by a two-step conversion system built with IagBgl1 and two other thermostable enzymes. This is the first report of enzymatic conversion for producing baohuoside I by thermostable enzymes.
(Copyright © 2020 Elsevier Inc. All rights reserved.)
Titel: |
Characterization of a novel thermostable glucose-tolerant GH1 β-glucosidase from the hyperthermophile Ignisphaera aggregans and its application in the efficient production of baohuoside I from icariin and total epimedium flavonoids.
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Autor/in / Beteiligte Person: | Xie, J ; Xu, H ; Jiang, J ; Zhang, N ; Yang, J ; Zhao, J ; Wei, M |
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Zeitschrift: | Bioorganic chemistry, Jg. 104 (2020-11-01), S. 104296 |
Veröffentlichung: | Amsterdam : Elsevier ; <i>Original Publication</i>: New York, London, Academic Press., 2020 |
Medientyp: | academicJournal |
ISSN: | 1090-2120 (electronic) |
DOI: | 10.1016/j.bioorg.2020.104296 |
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