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Microbacterium laevaniformans levansucrasesynthesized various hetero-oligosaccharides by transferringfructosyl residue from sucrose to various saccharides asacceptors. The acceptor specificity test showed that reducingsaccharides were more favorable acceptors than nonreducingsaccharides. The transfructosylated product, fructosyl galactose,was produced in the presence of D-galactose as an acceptor.The chemical structure of the resulting fructosyl galactosewas analyzed by yeast invertase and NMR, and identified asO-α-D-galactosyl-(1→2)-β-D-fructofuranoside. These resultsindicate that the main transfructosylation activity of theenzyme is to make nonreducing transferred products via atransfer of fructosyl residue to acceptor molecules havingreducing group. When nonreducing sugars, such as methylα-D-glucoside and methyl α-D-galactoside, were used as anacceptor, the transfer product was also formed in spite of thereducing group blocked with methyl group. The fact that notransfer product was formed with sugar alcohols as acceptorswas suggested to be due to marked conformational differenceof acceptors.

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