Abstract
A 3.2 kilobase pair DNA fragment from Thermus thermophilus HB27 coding for a β-galactosidase activity was cloned and sequenced. A gene and a truncated open reading frame orf1 encoding respectively a β-glycosidase (ttβ-gly) and probably a sugar permease were located directly adjacent to each other. The deduced aminoacid sequence of the enzyme Ttβ-gly showed strong identity with those of β-glycosidases belonging to the glycosyl hydrolase family 1. The enzyme was overexpressed in Escherichia coli and was purified by a two-step purification procedure. The recombinant enzyme is monomeric with a molecular mass of 49-kDa. It catalyzes the hydrolysis of β-D-galactoside, β-D-glucoside and β-D-fucoside derivatives. However, the kcat/Km ratio is much higher for p-nitrophenyl-β-D-glucoside and p-nitrophenyl-β-D-fucoside than for p-nitrophenyl-β-D-galactoside. The specificity towards linkage positions of the disaccharides tested decreased in the following order: β1-3 (100%) < β1-2 (71%) < β1-4 (40%) < β1-6 (10%). Ttβ-gly is a thermostable enzyme displaying an optimum temperature of 88°C and a half life of 10 min at 90°C. It performs transglycosylation reactions at high temperature with a yield exceeding 63% for transfucosylation reactions. On the basis of this work, the enzyme appears to be an attractive tool in the synthesis of fucosyl adducts and fucosyl sugars.
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Dion, M., Fourage, L., Hallet, JN. et al. Cloning and expression of a β-glycosidase gene from Thermus thermophilus. Sequence and biochemical characterization of the encoded enzyme. Glycoconj J 16, 27–37 (1999). https://doi.org/10.1023/A:1006997602727
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DOI: https://doi.org/10.1023/A:1006997602727