Abstract.
The Bacillus licheniformisβ-galactosidase gene, lacBl, was cloned on a 5.8-kb HindIII fragment into pBR322 and expressed by its own promoter in Escherichia coli. Deletion and complementation analysis showed that the enzyme-encoding region was located on a 4.1-kb HindIII-ClaI fragment. The transcription region for the lacBl was identified on this fragment with promoter- and terminator-probe plasmids. The deduced sequence of 149 aa of the N-terminal part of lacBl showed aa sequence homology with β-Gal from B. stearothermophilus, B. circulans, Haloferax alicantei, Clostridium perfringens, Arthrobacter sp.. No significant homology was shared with those found in the lacZ and lacS families. The recombinant β-galactosidase (LacB1) was purified by FPLC. The molecular mass of the enzyme (80 kDa) and its optimal pH (5.7) and temperature (45°C) were determined.
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Received: 9 December 1997 / Accepted: 26 January 1998
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Phan Trân, LS., Szabó, L., Fülöp, L. et al. Isolation of a β-Galactosidase-Encoding Gene from Bacillus licheniformis: Purification and Characterization of the Recombinant Enzyme Expressed in Escherichia coli . Curr Microbiol 37, 39–43 (1998). https://doi.org/10.1007/s002849900334
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DOI: https://doi.org/10.1007/s002849900334