Structure of the beta-galactosidase gene from Thermus sp. strain T2: expression in Escherichia coli and purification in a single step of an active fusion protein.

ABSTRACT: The nucleotide sequence of both the bgaA gene, coding for a thermostable beta-galactosidase of Thermus sp. strain T2, and its flanking regions was determined. The deduced amino acid sequence of the enzyme predicts a polypeptide of 645 amino acids (Mr, 73,595). Comparative analysis of the open reading frames located in the flanking regions of the bgaA gene revealed that they might encode proteins involved in the transport and hydrolysis of sugars. The observed homology between the deduced amino acid sequences of BgaA and the beta-galactosidase of Bacillus stearothermophilus allows us to classify the new enzyme within family 42 of glycosyl hydrolases. BgaA was overexpressed in its active form in Escherichia coli, but more interestingly, an active chimeric beta-galactosidase was constructed b

SUBMITTER: Vian A 

PROVIDER: S-EPMC106297 | biostudies-literature | 1998 Jun

REPOSITORIES: biostudies-literature