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Cloning and expression of thermostable β-glycosidase gene from thermus nonproteolyticus HG102 and characterization of recombinant enzyme

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The gene coding for β-glycosidase (EC 3.2.1.21) from Thermus nonproteolyticus HG102 was cloned and expressed in Escherichia coli. The gene open reading frame was 1311 bp, and it codes for 437 amino acids. The deduced amino acid sequence of the enzyme showed identity with members of the glycosyl hydrolase family I. The enzyme had high content of Arg and Pro. The recombinant enzyme was purified to homogeneity with heat precipitation, ammonium sulfate precipitation, DEAE-cellulose (DE52) chromatography, and prepared slab polyacrylamide gel electrophoresis. The enzyme was monomeric and had a molecular mass of 48,900 Daltons and a pI of 5.2. The enzyme showed optimum activity at pH 5.6 and 90°C. It catalyzed the hydrolysis of β-d-glucoside, β-d-galactoside, β-d-fucoside, and β-d-mannoside. Lineweaver-Burk plots showed that the k cat /K m ratio for β-d-glucoside and β-d-fucoside was higher than for β-d-mannoside and β-d-galactoside. The enzyme was extremely thermostable, with a half-life of 2.5 h at 90°C, and was stable over a wide range of pH. It also had transglycosidic activity at high temperature.

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He, X., Zhang, S. & Yang, S. Cloning and expression of thermostable β-glycosidase gene from thermus nonproteolyticus HG102 and characterization of recombinant enzyme. Appl Biochem Biotechnol 94, 243–255 (2001). https://doi.org/10.1385/ABAB:94:3:243

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  • DOI: https://doi.org/10.1385/ABAB:94:3:243

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