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- W1984842489 abstract "Levansucrase from Microbacterium laevaniformans ATCC 15953 produced in a 3% sucrose medium was purified to homogeneity from cell-free extracts by ammonium sulfate precipitation, DEAE-Sepharose Fast Flow and Sephacryl S-100 HR chromatographies. The molecular mass of the purified enzyme was 64 kDa as measured by SDS–PAGE. The optimum pH and temperature for the levan formation were 6.0 and 30 °C, respectively. The levan-forming activity was strongly inhibited by CuSO4 and HgCl2, and moderately inhibited by ZnSO4. The enzyme synthesized a variety of fructosyl oligosaccharides from various saccharides as fructosyl acceptors. Disaccharides were more favorable fructosyl acceptors than monosaccharides. The structure of the transfer product when melibiose was used as an acceptor was determined by enzyme hydrolysis and 13C NMR spectroscopy. The chemical structure of the resulting fructosyl melibiose was identified as O-α-d-galactopyranosyl-(1→6)-α-d-glucopyranosyl-(1→2)-β-d-fructofranoside. This result suggests that levansucrase from M. laevaniformans specifically transferred the fructose moiety of sucrose to the C1OH position of the glucose residue of melibiose." @default.
- W1984842489 created "2016-06-24" @default.
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- W1984842489 date "2003-06-01" @default.
- W1984842489 modified "2023-10-08" @default.
- W1984842489 title "Enzymatic synthesis of fructosyl oligosaccharides by levansucrase from Microbacterium laevaniformans ATCC 15953" @default.
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- W1984842489 doi "https://doi.org/10.1016/s0141-0229(03)00062-0" @default.
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