title: Purification and properties of recombinant beta-galactosidase from Bacillus circulans.
abstract: A gene encoding beta-galactosidase from Bacillus circulans which had hydrolysis specificity for the beta1-3 linkage was expressed in Escherichia coli. The beta-galactosidase was purified from crude cell lysates of E. coli by column chromatographies on Resource Q and Sephacryl S-200 HR. The enzyme released galactose with high selectivity from oligosaccharides which had terminal beta1-3 linked galactose residues. However it did not hydrolyse beta1-4 linked galactooligosaccharides. Moreover, Galbeta1-3GlcNAc, Galbeta1-3GalNAc, and their p-nitrophenyl glycosides were regioselectively synthesized in 10-46% yield by the transglycosylation reaction using this enzyme.
authors.affiliation: Meiji Institute of Health Science, Naruda Odawara, Japan. RXG01204@niftyserve.or.jp
authors.forename: H
authors.initials: H
authors.lastname: Fujimoto
authors.forename: M
authors.initials: M
authors.lastname: Miyasato
authors.forename: Y
authors.initials: Y
authors.lastname: Ito
authors.forename: T
authors.initials: T
authors.lastname: Sasaki
authors.forename: K
authors.initials: K
authors.lastname: Ajisaka
mesh_terms: D001407:Bacillus / Q000201:enzymology*; D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D004187:Disaccharides / Q000138:chemical synthesis / Q000378:metabolism; D006031:Glycosylation; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D007526:Isoelectric Point; D007700:Kinetics; D008969:Molecular Sequence Data; D008970:Molecular Weight; D009844:Oligosaccharides / Q000737:chemistry / Q000378:metabolism*; D011994:Recombinant Proteins / Q000302:isolation & purification / Q000378:metabolism; D013379:Substrate Specificity; D013696:Temperature; D001616:beta-Galactosidase / Q000302:isolation & purification* / Q000378:metabolism*
chemical_list: D004187:Disaccharides; D009844:Oligosaccharides; D011994:Recombinant Proteins; D001616:beta-Galactosidase