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Cloning, expression and characterization of a glycoside hydrolase family 51 α-l-arabinofuranosidase from Thermoanaerobacterium thermosaccharolyticum DSM 571

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Abstract

The present study focused on the characterization of a glycoside hydrolase 51 family α-l-arabinofuranosidase named TtAbf51 from thermophile Thermoanaerobacterium thermosaccharolyticum DSM 571. The recombinant TtAbf51 with 497 amino acids was successfully expressed in Escherichia coli BL21(DE3) and purified via nickel affinity chromatography, and native protein was a dimer verified by size exclusion chromatography. The TtAbf51 showed an optimum pH and temperature of 5.5 and 55 °C, and was relatively stable at pH 5.0–8.0 and up to 60 °C for 2 h of incubation. In addition, TtAbf51 was significantly inhibited by Cu2+, Zn2+ and 1 mM or 10 mM SDS. In the presence of 800 mM arabinose, the residual activity remained over 40% of the initial activity. In addition, the recombinant enzyme possessed a good catalytic effect for both synthesized and natural substrates, and the specific enzyme activity toward CM-linear arabinan reached 426.5 μmol min−1 mg−1. In summary, this study provides an α-l-arabinofuranosidase with potential in the synergistic hydrolysis of hemicellulose to fermentable sugars in applications such as liquid biofuels, food and beverages, and related industries.

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Funding

This work was financially supported by the Primary Research and Development Plan of Jiangsu Province (Grant No. BE2020392) and Jiangsu Provincial Engineering Laboratory for Biomass Conversion and Process Integration (JPELBCPI2018005).

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H.S performed the experiments, drafted the manuscript and critically revised the manuscript, F.G drafted the manuscript, X.Y performed the bioinformatic analysis, Q.L and X.N analyzed the data.

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Correspondence to Hao Shi.

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All authors declare no competing interests.

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Shi, H., Gao, F., Yan, X. et al. Cloning, expression and characterization of a glycoside hydrolase family 51 α-l-arabinofuranosidase from Thermoanaerobacterium thermosaccharolyticum DSM 571. 3 Biotech 12, 176 (2022). https://doi.org/10.1007/s13205-022-03254-8

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  • DOI: https://doi.org/10.1007/s13205-022-03254-8

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