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A thermostable b-glycosidase gene, tfi b-gly, wascloned from the genomic library of Thermus filiformis Wai33A1. tfi b-gly consists of 1,296 bp nucleotide sequence andencodes a polypeptide of 431 amino acids. It shares a strongamino acid sequence similarity with the b-glycosidases from otherThermus spp. belonging to the glycosyl hydrolase family 1. Inthe present study, the enzyme was overexpressed in Escherichiacoli BL21 (DE3) using the pET21b(+) vector system. Therecombinant enzyme was purified to homogeneity by heattreatment and a Ni2+-affinity chromatography. Polyacrylamidegel electrophoresis (PAGE) showed that the recombinant Tfib-glycosidase was a monomeric form with molecular mass of49 kDa. The temperature and pH range for optimal activity ofthe purified enzyme were 80- 90oC and 5.0- 6.0, respectively.Ninety-three percent of the enzyme activity was remained at70oC after 12 h, and its half-life at 80oC was 6 h, indicatingthat Tfi b-glycosidase is highly thermostable. Based on its Kmor Kcat/Km ratio, Tfi b-glycosidase appeared to have higheraffinity for b-D-glucoside than for b-D-galactoside, however,Kcat for b-D-galactoside was much higher than that for b-Dglucoside.The activity for lactose hydrolysis was proportionallyincreased at 70oC and pH 7.0 without substrate inhibition untilreaching 250 mM lactose concentration. The specific activityof Tfi b-glycosidase on 138mM lactose at 70oC and pH 7.0 was134.9 U/mg. Consequently, this newly cloned enzyme appearsto have a valuable advantage of conducting biotechnologicalprocesses at elevated temperature during milk pasteurizationin the production of low-lactose milk.

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