title: Enzymatic synthesis of novel oligosaccharides from L-sorbose, maltose, and sucrose using kojibiose phosphorylase.
abstract: Glucosyl-L-sorbose, -maltose, and -sucrose were synthesized using kojibiose phosphorylase (KPase) from Thermoanaerobacter brockii ATCC35047 with beta-D-glucose-1-phosphate (beta-G1P) as a glucosyl donor. One disaccharide and two trisaccharides thus synthesized were isolated by Toyopearl HW-40S column chromatography. The results of KPase digestion, methylation analysis, and 13C-NMR studies indicated that these oligosaccharides were alpha-D-glucopyranosyl-(1-->5)-alpha-L-sorbopyranose, alpha-D-glucopyranosyl-(1-->2)-alpha-D-glucopyranosyl-(1-->4)-D-glucopyranose (4-alpha-D-kojibiosyl-glucose), and alpha-D-glucopyranosyl-(1-->2)-alpha-D-glucopyranosyl-(1-->2)-beta-D-fructofuranoside, which are all novel oligosaccharides. Glucosyl-L-sorbose was partially hydrolyzed to glucose and L-sorbose by alpha-glucosidases, while glucosyl-sucrose and glucosyl-maltose were not hydrolyzed by glucoamylase, alpha-glucosidases, or CGTase.
authors.affiliation: Hayashibara Biochemical Laboratories Inc., 7-7 Amase-minami machi, Okayama 700-0834, Japan. amaseken@hayashibara.co.jp
authors.forename: H
authors.initials: H
authors.lastname: Chaen
authors.forename: T
authors.initials: T
authors.lastname: Nishimoto
authors.forename: T
authors.initials: T
authors.lastname: Nakada
authors.forename: S
authors.initials: S
authors.lastname: Fukuda
authors.forename: M
authors.initials: M
authors.lastname: Kurimoto
authors.forename: Y
authors.initials: Y
authors.lastname: Tsujisaka