Abstract
A novel β-galactosidase gene, zd410, was isolated by screening a soil metagenomic library. Sequence analysis revealed that zd410 encodes a protein of 672 amino acids with a predicted molecular weight of 78.6 kDa. The recombinant ZD410 was expressed and purified in Pichia pastoris, with a yield of ca. 300 mg from 1 L culture. The purified enzyme displayed optimal activity at 38°C and pH 7.0. Given that the enzyme had 54% of the maximal activity at 20°C and 11% of the maximal activity at close to 0°C, ZD410 was regarded as a cold-adapted β-galactosidase. ZD410 displays high enzymatic activity for its synthetic substrate-ONPG (o-nitrophenyl-β-d-galactopyranoside, 243 U/mg) and its natural substrate-lactose (25.4 U/mg), while its activity was slightly stimulated by addition of Na+, K+, or Ca2+ at low concentrations. ZD410 is a good candidate of β-galactosidases for food industry after further study.
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Acknowledgements
We are grateful to the National High Technology Research and Development Program of China (863 Program) (2007AA10Z308), National Natural Science Foundation of China (30970107), the Science and Technology Plan Project of Guangdong province (2007A010900001), and the Reserve Key Project of Sun Yat-sen University (2007-33000-1132628) for their financial support.
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Kui Wang and Gang Li contributed equally to this work.
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Wang, K., Li, G., Yu, S.Q. et al. A novel metagenome-derived β-galactosidase: gene cloning, overexpression, purification and characterization. Appl Microbiol Biotechnol 88, 155–165 (2010). https://doi.org/10.1007/s00253-010-2744-7
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DOI: https://doi.org/10.1007/s00253-010-2744-7