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A highly versatile fungal glucosyltransferase for specific production of quercetin-7-O-β-d-glucoside and quercetin-3-O-β-d-glucoside in different hosts

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Abstract

Glycosylation is an effective way to improve the water solubility of natural products. In this work, a novel glycosyltransferase gene (BbGT) was discovered from Beauveria bassiana ATCC 7159 and heterologously expressed in Escherichia coli. The purified enzyme was functionally characterized through in vitro enzymatic reactions as a UDP-glucosyltransferase, converting quercetin to five monoglucosylated and one diglucosylated products. The optimal pH and temperature for BbGT are 35 ℃ and 8.0, respectively. The activity of BbGT was stimulated by Ca2+, Mg2+, and Mn2+, but inhibited by Zn2+. BbGT enzyme is flexible and can glycosylate a variety of substrates such as curcumin, resveratrol, and zearalenone. The enzyme was also expressed in other microbial hosts including Saccharomyces cerevisiae, Pseudomonas putida, and Pichia pastoris. Interestingly, the major glycosylation product of quercetin in E. coli, P. putida, and P. pastoris was quercetin-7-O-β-d-glucoside, while the enzyme dominantly produced quercetin-3-O-β-d-glucoside in S. cerevisiae. The BbGT-harboring E. coli and S. cerevisiae strains were used as whole-cell biocatalysts to specifically produce the two valuable quercetin glucosides, respectively. The titer of quercetin-7-O-β-d-glucosides was 0.34 ± 0.02 mM from 0.83 mM quercetin in 24 h by BbGT-harboring E. coli. The yield of quercetin-3-O-β-d-glucoside was 0.22 ± 0.02 mM from 0.41 mM quercetin in 12 h by BbGT-harboring S. cerevisiae. This work thus provides an efficient way to produce two valuable quercetin glucosides through the expression of a versatile glucosyltransferase in different hosts.

Key points

A highly versatile glucosyltransferase was identified from B. bassiana ATCC 7159.

BbGT converts quercetin to five mono- and one di-glucosylated derivatives in vitro.

Different quercetin glucosides were produced by BbGT in E. coli and S. cerevisiae.

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All data generated or analyzed during this study are included in this published article (and its supplementary information files).

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Funding

This work was supported by the National Science Foundation Award CBET-2044558. The Bruker Avance III HD Ascend-500 NMR instrument used in this research was funded by the National Science Foundation Award CHE–1429195.

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Contributions

JR, WT, and JZ conceived and designed research. JR, WT, CDB, OP, MWM, AP, BW, SEH, and LPS conducted experiments. JR, WT, JH, and JZ analyzed data. JR, WT, and JZ wrote the manuscript. All authors read and approved the manuscript.

Corresponding author

Correspondence to Jixun Zhan.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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The authors declare no competing interests.

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Jie Ren and Wenzhu Tang contributed equally to this work.

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Ren, J., Tang, W., Barton, C.D. et al. A highly versatile fungal glucosyltransferase for specific production of quercetin-7-O-β-d-glucoside and quercetin-3-O-β-d-glucoside in different hosts. Appl Microbiol Biotechnol 106, 227–245 (2022). https://doi.org/10.1007/s00253-021-11716-x

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  • DOI: https://doi.org/10.1007/s00253-021-11716-x

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