Engineering enzymes: The glutamic acid nucleophile of a retaining β-mannosidase has been replaced with a serine residue to form a β-mannosynthase. When the new enzyme is provided with an α-mannosyl fluoride donor and an appropriate acceptor, β-mannoside linkages are synthesized. Remarkably, α-mannosyl fluoride can be generated in situ by providing the mannosynthase with excess fluoride ion.
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Nashiru et al. (2001) studied this question.
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