Abstract
A novel β-glucosidase of glycoside hydrolase (GH) family 3 from Myceliophthora thermophila (mtbgl3b) was successfully expressed in Pichia pastoris. The full-length gene consists of 2613 bp nucleotides encoding a protein of 870 amino acids. MtBgl3b showed maximum activity at pH 5.0 and remained more than 70 % relative activity at 3.5–6.0. The enzyme displayed the highest activity at 60 °C and kept about 90 % relative activity for 50–65 °C; besides, the enzyme showed psychrophilic trait and remains 51 % relative activity at 40 °C. MtBgl3b exhibited good stability over a wide pH range of 3.0–10.0 and was thermostable at 60 and 65 °C. The enzyme displayed highest activity towards p-nitrophenyl-β-d-glucopyranoside (pNPG), followed by p-nitrophenyl-d-cellobioside (pNPC), cellotetraose, cellotriose, cellobiose, and gentiobiose. When using 10 % cellobiose (w/v) as the substrate, the enzyme showed transglycosylation activity to produce the cellotriose. The kinetic parametric of K m and V max were 2.78 mM and 927.9 μM mg−1 min−1, respectively. Finally, the reaction mode of the enzyme and the substrates were analyzed by molecular docking approach.
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This study was supported by the National High-Tech Research and Development Program (863 Program, No. 2012AA022203 and No. SS2014AA021301) and Tianjin Zhuanxiang Project (13ZCDZSY05000).
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Zhao, J., Guo, C., Tian, C. et al. Heterologous Expression and Characterization of a GH3 β-Glucosidase from Thermophilic Fungi Myceliophthora thermophila in Pichia pastoris . Appl Biochem Biotechnol 177, 511–527 (2015). https://doi.org/10.1007/s12010-015-1759-z
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DOI: https://doi.org/10.1007/s12010-015-1759-z