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- W1484831214 abstract "The relative contributions to the specificity and catalysis of aglycone, of residues E190, E194, K201 and M453 that form the aglycone‐binding site of a β‐glycosidase from Spodoptera frugiperda (EC 3.2.1.21), were investigated through site‐directed mutagenesis and enzyme kinetic experiments. The results showed that E190 favors the binding of the initial portion of alkyl‐type aglycones (up to the sixth methylene group) and also the first glucose unit of oligosaccharidic aglycones, whereas a balance between interactions with E194 and K201 determines the preference for glucose units versus alkyl moieties. E194 favors the binding of alkyl moieties, whereas K201 is more relevant for the binding of glucose units, in spite of its favorable interaction with alkyl moieties. The three residues E190, E194 and K201 reduce the affinity for phenyl moieties. In addition, M453 favors the binding of the second glucose unit of oligosaccharidic aglycones and also of the initial portion of alkyl‐type aglycones. None of the residues investigated interacted with the terminal portion of alkyl‐type aglycones. It was also demonstrated that E190, E194, K201 and M453 similarly contribute to stabilize ES ‡ . Their interactions with aglycone are individually weaker than those formed by residues interacting with glycone, but their joint catalytic effects are similar. Finally, these interactions with aglycone do not influence glycone binding." @default.
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- W1484831214 date "2008-04-18" @default.
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- W1484831214 title "The role in the substrate specificity and catalysis of residues forming the substrate aglycone-binding site of a β-glycosidase" @default.
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- W1484831214 doi "https://doi.org/10.1111/j.1742-4658.2008.06402.x" @default.
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