7CWI
Crystal structure of beta-galactosidase II from Bacillus circulans
Summary for 7CWI
| Entry DOI | 10.2210/pdb7cwi/pdb |
| Descriptor | beta-galactosidase, GLYCEROL, SULFATE ION, ... (5 entities in total) |
| Functional Keywords | beta-galactosidase, carbohydrate, hydrolase |
| Biological source | Bacillus circulans |
| Total number of polymer chains | 1 |
| Total formula weight | 93117.15 |
| Authors | |
| Primary citation | Choi, J.Y.,Hong, H.,Seo, H.,Pan, J.G.,Kim, E.J.,Maeng, P.J.,Yang, T.H.,Kim, K.J. High Galacto-Oligosaccharide Production and a Structural Model for Transgalactosylation of beta-Galactosidase II from Bacillus circulans . J.Agric.Food Chem., 68:13806-13814, 2020 Cited by PubMed Abstract: The transgalactosylase activity of β-galactosidase produces galacto-oligosaccharides (GOSs) with prebiotic effects similar to those of major oligosaccharides in human milk. β-Galactosidases from ATCC 31382 are important enzymes in industrial-scale GOS production. Here, we show the high GOS yield of β-galactosidase II from (β-Gal-II, Lactazyme-B), compared to other commercial enzymes. We also determine the crystal structure of the five conserved domains of β-Gal-II in an apo-form and complexed with galactose and an acceptor sugar, showing the heterogeneous mode of transgalactosylation by the enzyme. Truncation studies of the five conserved domains reveal that all five domains are essential for enzyme catalysis, while some truncated constructs were still expressed as soluble proteins. Structural comparison of β-Gal-II with other β-galactosidase homologues suggests that the GOS linkage preference of the enzyme might be quite different from other enzymes. The structural information on β-Gal-II might provide molecular insights into the transgalactosylation process of the β-galactosidases in GOS production. PubMed: 33169609DOI: 10.1021/acs.jafc.0c05871 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (1.95 Å) |
Structure validation
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