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Anomeric Selectivity of Trehalose Transferase with Rare l-Sugars.


ABSTRACT: Retaining LeLoir glycosyltransferases catalyze the formation of glycosidic bonds between nucleotide sugar donors and carbohydrate acceptors. The anomeric selectivity of trehalose transferase from Thermoproteus uzoniensis was investigated for both d- and l-glycopyranose acceptors. The enzyme couples a wide range of carbohydrates, yielding trehalose analogues with conversion and enantioselectivity of >98%. The anomeric selectivity inverts from ?,?-(1 ? 1)-glycosidic bonds for d-glycopyranose acceptors to ?,?-(1 ? 1)-glycosidic bonds for l-glycopyranose acceptors, while (S)-selectivity was retained for both types of sugar acceptors. Comparison of protein crystal structures of trehalose transferase in complex with ?,?-trehalose and an unnatural ?,?-trehalose analogue highlighted the mechanistic rationale for the observed inversion of anomeric selectivity.

SUBMITTER: Mestrom L 

PROVIDER: S-EPMC7493220 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature

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Retaining LeLoir glycosyltransferases catalyze the formation of glycosidic bonds between nucleotide sugar donors and carbohydrate acceptors. The anomeric selectivity of trehalose transferase from <i>Thermoproteus uzoniensis</i> was investigated for both d- and l-glycopyranose acceptors. The enzyme couples a wide range of carbohydrates, yielding trehalose analogues with conversion and enantioselectivity of >98%. The anomeric selectivity inverts from α,α-(1 → 1)-glycosidic bonds for d-glycopyranos  ...[more]

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