30694-44-1Relevant academic research and scientific papers
Anomeric Selectivity of Trehalose Transferase with Rare l -Sugars
Bento, Isabel,Hagedoorn, Peter-Leon,Hanefeld, Ulf,Jeffries, Cy M.,Laustsen, Jesper U.,Marsden, Stefan R.,Mestrom, Luuk,Svergun, Dmitri I.,Van Der Eijk, Hessel
, p. 8835 - 8839 (2020)
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 α,α-(1 → 1)-glycosidic bonds for d-glycopyranose acceptors to α,β-(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 α,α-trehalose and an unnatural α,β-trehalose analogue highlighted the mechanistic rationale for the observed inversion of anomeric selectivity.
Synthesis of UDP-4-deoxy-4-fluoroglucose and UDP-4-deoxy-4-fluorogalactose and their interactions with enzymes of nucleotide sugar metabolism
Chapeau,Frey
, p. 6994 - 6998 (2007/10/02)
Fluorinated carbohydrates can be used as probes of enzymatic active sites. We report the synthesis of 4-deoxy-4-fluoro-α-D-galactose-1-phosphate and the substrate analogues of UDP-galactose, UDP4-deoxy-4-fluoro-α-D-galactose (UDP-FGal), and of UDP-glucose, UDP-4-deoxy-4-fluoro-α-D-glucose (UDP-FGlc), which may be useful in analyzing the binding properties of enzymes that utilize nucleotide sugars as substrates. As a first step in this study, we determine the kinetic and inhibition parameters for UDP-FGal and UDP-FGlc interacting with UDP-glucose dehydrogenase and UDP-galactose 4-epimerase. UDP-FGlc is a substrate for bovine liver UDP-glucose dehydrogenase: K(m) = 30.2 ± 4.5 μM slightly higher than the value 9.6 ± 0.7 μM for UDP-glucose, and V(m)(UDP-FGlc) = 0.46V(mUDP-Glc). UDP-FGal is not a substrate for UDP-glucose dehydrogenase but is a competitive inhibitor with respect to UDP-glucose (K(i) = 19.9 ± 6.6 μM). These analogs also bind to UDP-galactose 4-epimerase from E. coli with dissociation constants K(d) of 1.4 and 1.1 mM for UDP-FGlc and UDP-FGal, respectively.
THE SYNTHESIS AND HYDROLYSIS OF A SERIES OF DEOXYFLUORO-D-GLUCOPYRANOSYL PHOSPHATES
Withers, Stephen G.,MacLennan, David J.,Street, Ian P.
, p. 127 - 144 (2007/10/02)
The synthesis of all four deoxyfluoro-α-D-glucopyranosyl phosphates is described.Rate conctants for their acid-catalyzed hydrolysis were determined, and fluorine substitution was shown to have a significant effect in lowering the rate, particularly when t
