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Target Discovery of Novel α-l-Rhamnosidases from Human Fecal Metagenome and Application for Biotransformation of Natural Flavonoid Glycosides

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Abstract

As a green and powerful tool, biocatalysis has emerged as a perfect alternative to traditional chemistry. The bottleneck during process development is discovery of novel enzymes with desired properties and independent intellectual property. Herein, we have successfully bioprospected three novel bacterial α-l-rhamnosidases from human fecal metagenome using a combinatorial strategy by high-throughput de novo sequencing combined with in silico searching for catalytic key motifs. All three novel α-l-rhamnosidases shared low sequence identities with reported (< 35%) and putative ones (< 57%) from public database. All three novel α-l-rhamnosidases were over-expressed as soluble form in Escherichia coli with high-level production. Furthermore, all three novel α-l-rhamnosidases hydrolyzed the synthetic substrate p-nitrophenyl α-l-rhamnopyranoside and natural flavonoid glycosides rutin and naringin with some excellent properties, such as high activity in acidic pH, high activity at low or high temperature, and good tolerance for alcohols and DMSO. Our findings would provide a convenient route for target discovery of the promising biocatalysts from the metagenomes for biotransformation and biosynthesis.

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Funding

This work was supported by the National Natural Science Foundation of China (No. 31400684) and the Natural Science Foundation of Shanxi (No. 2014021030-3).

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Authors and Affiliations

  1. Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education, Institute of Biotechnology, Shanxi University, Taiyuan, 030006, China

    Bin-Chun Li, Tian Zhang, Yan-Qin Li & Guo-Bin Ding

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  1. Bin-Chun Li
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  2. Tian Zhang
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  3. Yan-Qin Li
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Correspondence to Bin-Chun Li.

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Li, BC., Zhang, T., Li, YQ. et al. Target Discovery of Novel α-l-Rhamnosidases from Human Fecal Metagenome and Application for Biotransformation of Natural Flavonoid Glycosides. Appl Biochem Biotechnol 189, 1245–1261 (2019). https://doi.org/10.1007/s12010-019-03063-5

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