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- W2147996264 abstract "Pyrococcus furiosus laminarinase (LamA, PF0076) is an endo-glycosidase that hydrolyzes beta-1,3-glucooligosaccharides, but not beta-1,4-gluco-oligosaccharides. We studied the specificity of LamA towards small saccharides by using 4-methylumbelliferyl beta-glucosides with different linkages. Besides endo-activity, wild-type LamA has some exo-activity, and catalyzes the hydrolysis of mixed-linked oligosaccharides (Glcbeta4Glcbeta3Glcbeta-MU (Glc = glucosyl, MU = 4-methylumbelliferyl)) with both beta-1,4 and beta-1,3 specificities. The LamA mutant E170A had severely reduced hydrolytic activity, which is consistent with Glu170 being the catalytic nucleophile. The E170A mutant was active as a glycosynthase, catalyzing the condensation of alpha-laminaribiosyl fluoride to different acceptors. The best condensation yields were found at pH 6.5 and 50 degrees C, but did not exceed 30%. Depending on the acceptor, the synthase generated either a beta-1,3 or a beta-1,4 linkage." @default.
- W2147996264 created "2016-06-24" @default.
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- W2147996264 date "2004-01-01" @default.
- W2147996264 modified "2023-09-23" @default.
- W2147996264 title "Hydrolase and glycosynthase activity of endo-1,3-β-glucanase from the thermophile<i>Pyrococcus furiosus</i>" @default.
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- W2147996264 doi "https://doi.org/10.1155/2004/731548" @default.
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