期刊
CARBOHYDRATE RESEARCH
卷 340, 期 3, 页码 449-454出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carres.2004.12.012
关键词
cyclic tetrasaccharide; Thermoanaerobacter brockii; kojibiose phosphorylase; transglucosylation
The glucosyl transfer reaction of kojibiose phosphorylase (KPase) from Thermoanaerobacter brockii ATCC35047 was examined using cyclo-{-->6)-alpha-D-Glcp-(1-->3)-alpha-D-Glcp-(1-->6)-alpha-D-Glcp-(1-->3)-alpha-D-Glcp-(1-->} (CTS) as an acceptor. KPase produced four transfer products, saccharides 1-4. The structure of a major product, saccharide 4, was 2-O-alpha-D-glucopyranosyl-CTS, cyclo-{-->6)-alpha-D-Glcp-(1-->3)-alpha-D-Glcp-(1-->6)-[alpha-D-Glcp)-(1-->2)]-alpha-D-Glcp-(1-->3)-alpha-D-Glcp-(1-->}. The other transfer products, saccharides 1-3, were 2-O-alpha-kojibiosyl-, 2-O-alpha-kojitriosyl-, and 2-O-alpha-kojitetraosyl-CTS, respectively. These results showed that KPase transferred a glucose residue to the C-2 position at the ring glucose residue of CTS. This enzyme also catalyzed the chain-extending reaction of the side chain of 2-O-alpha-D-glycopyranosyl-CTS. (C) 2004 Elsevier Ltd. All rights reserved.
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