Crystal structure of a glycoside hydrolase family 68 beta-fructosyltransferase fromBeijerinckia indicasubsp.indicain complex with fructose.Tonozuka, T., Kitamura, J., Nagaya, M., Kawai, R., Nishikawa, A., Hirano, K., Tamura, K., Fujii, T., Tochio, T.
(2020) Biosci Biotechnol Biochem : 1-13
- PubMed: 32752982
- DOI: 10.1080/09168451.2020.1804317
- Primary Citation of Related Structures:
- PubMed Abstract:
An enzyme belonging to glycoside hydrolase family 68 (GH68) from Beijerinckia indica subsp. indica NBRC 3744 was expressed in Escherichia coli . Biochemical characterization showed that the enzyme was identified to be a β-fr ...
An enzyme belonging to glycoside hydrolase family 68 (GH68) from Beijerinckia indica subsp. indica NBRC 3744 was expressed in Escherichia coli . Biochemical characterization showed that the enzyme was identified to be a β-fructosyltransferase (BiBftA). Crystallization of a full-length BiBftA was initially attempted, but no crystals were obtained. We constructed a variant in which 5 residues (Pro199-Gly203) and 13 residues (Leu522-Gln534) in potentially flexible regions were deleted, and we successfully crystallized this variant BiBftA. BiBftA is composed of a five-bladed β-propeller fold as in other GH68 enzymes. The structure of BiBftA in complex with fructose unexpectedly indicated that one β-fructofuranose (β-Fru f ) molecule and one β-fructopyranose molecule bind to the catalytic pocket. The orientation of β-Fru f at subsite -1 is tilted from the orientation observed in most GH68 enzymes, presenting a second structure of a GH68 enzyme in complex with the tilted binding mode of β-Fru f.
R&D Center, B Food Science Co. Ltd , Aichi, Japan.