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A novel thermostable β-galactosidase gene, designated as GkGal1A, from the thermophilic bacterium Geobacillus kaustophilus HTA426 was cloned and heterologously overexpressed in Escherichia coli(E. coli). Based on the sequence analysis, GkGal1A belongs to the glycosyl hydrolase family 1 that was the first β-galactosidase of bacterial origins expressed by us in this family. The apparent molecular weight...
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