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Three amino acid residues of 1,3-β-galactosyl-N-acetylhexosamine phosphorylase (GalHexNAcP) were assigned as the determinants of substrate preference for galacto-N-biose (GNB) and lacto-N-biose I (LNB) based on the three-dimensional structure of the protein. Mutants of GalHexNAcP from Bifidobacterium longum, which acts similarly on both GNB and LNB, were constructed and characterized. V162T mutation...
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