Abstract
Endo-1,4-β-mannosidases catalyze the cleavage of the β-d-1,4-mannopyranosyl linkage in mannan and have potential biotechnological applications in biofuel production, manno-oligosaccharide production, cleansing, and food and feed industries. In this study, an endo-1,4-β-mannosidase gene (TaMan3A) from wheat (Triticum aestivum) was successfully expressed in Pichia pastoris, and the antifungal effectiveness and manno-oligosaccharide production of the enzyme were evaluated. The purified TaMan3A exhibited a molecular weight of approximately 43 kDa, and its highest enzyme activity at pH 4.0 and 40 °C. Comparisons with other β-mannanases showed that TaMan3A had a conserved mannan-binding V-shaped groove, catalytic acid/base residue (E179), and nucleophilic residue (E297). Antifungal assays for TaMan3A against seven fungi commonly associated with wheat kernels showed that this enzyme had higher inhibitory effects on hyphal growth of the field fungi Fusarium graminearum and Alternaria sp. in comparison with that of storage fungi. TaMan3A could hydrolyze mannan polymers of galactomannan and Konjac glucomannan to mannobiose, mannotriose, and mannotetraose as the main products. Overall, these results showed the potential of TaMan3A for enhancing host resistance against fungal pathogens in wheat and manno-oligosaccharide production in the feed and food industries.
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Abbreviations
- TaMan3A:
-
endo-1,4-β-mannosidase gene in Triticum aestivum chromosome 3A
- RT-PCR:
-
reverse transcription polymerase chain reaction
- YPD:
-
yeast extract peptone dextrose medium
- TLC:
-
thin-layer chromatography
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Project no. 31772023), the National Key Research and Development Plan (Project Nos.2017YFC1600900 and 2017YFD0401404), the National Key Research and Development Project of China (2019YFC1605400), and the Scientific Research foundation of Henan University of Technology (Project No. 2018RCJH14). SBZ and JPC designed the experiments, SBZ and WJZ executed the experiments. NL, HCZ, and YYL analyzed experiments results. SBZ and YSH wrote and revised the manuscript. All authors read and approved the final manuscript.
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Fig. S1
Alignment of amino acid sequences of endo-1,4-β-mannosidase from Triticum aestivum, Aegilops tauschii (AAC14399.1), Brachypodium distachyon (CAJ58510.1), with sequence identity of 98.00% and 83.66%, respectively. (PNG 483 kb)
Fig. S2
The ribbon diagram of structural model of endo-1,4-β-mannosidase constructed by the SWISS-MODEL visualized using PyMOL. The canonical (β/α)8 fold secondary structure elements are colored green (β-strands) and violet (α-helices). Additional secondary structure elements are colored cyan (β-strands) and orange (α-helices). The catalytic residues E179 is shown as stick structure in red color and the nucleophile residue E297 is shown as stick structure in yellow color. (PNG 5652 kb)
Fig. S3
Identification of the catalytic acid/base residue (E179) and the nucleophilic residue (E297) by alignment of amino acid sequences of endo-1,4-β-mannosidase from Triticum aestivum and L. esculentum. The acid/base (Ê) and nucleophile (Ë) are highlighted. (PNG 483 kb)
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Zhang, SB., Zhang, WJ., Li, N. et al. Functional expression and characterization of an endo-1,4-β-mannosidase from Triticum aestivum in Pichia pastoris. Biologia 75, 2073–2081 (2020). https://doi.org/10.2478/s11756-020-00525-8
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DOI: https://doi.org/10.2478/s11756-020-00525-8