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• W2003759854 endingPage "13560" @default.
• W2003759854 startingPage "13555" @default.
• W2003759854 abstract "The mechanism and the site of substrate (i.e., aglycone) recognition and specificity were investigated in maize β-glucosidase (Glu1) by x-ray crystallography by using crystals of a catalytically inactive mutant (Glu1E191D) in complex with the natural substrate 2- O -β- d -glucopyranosyl-4-hydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOAGlc), the free aglycone DIMBOA, and competitive inhibitor para -hydroxy- S -mandelonitrile β-glucoside (dhurrin). The structures of these complexes and of the free enzyme were solved at 2.1-, 2.1-, 2.0-, and 2.2-Å resolution, respectively. The structural data from the complexes allowed us to visualize an intact substrate, free aglycone, or a competitive inhibitor in the slot-like active site of a β-glucosidase. These data show that the aglycone moiety of the substrate is sandwiched between W378 on one side and F198, F205, and F466 on the other. Thus, specific conformations of these four hydrophobic amino acids and the shape of the aglycone-binding site they form determine aglycone recognition and substrate specificity in Glu1. In addition to these four residues, A467 interacts with the 7-methoxy group of DIMBOA. All residues but W378 are variable among β-glucosidases that differ in substrate specificity, supporting the conclusion that these sites are the basis of aglycone recognition and binding (i.e., substrate specificity) in β-glucosidases. The data also provide a plausible explanation for the competitive binding of dhurrin to maize β-glucosidases with high affinity without being hydrolyzed." @default.
• W2003759854 created "2016-06-24" @default.
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• W2003759854 date "2000-12-05" @default.
• W2003759854 modified "2023-10-10" @default.
• W2003759854 title "The mechanism of substrate (aglycone) specificity in β-glucosidases is revealed by crystal structures of mutant maize β-glucosidase-DIMBOA, -DIMBOAGlc, and -dhurrin complexes" @default.
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• W2003759854 doi "https://doi.org/10.1073/pnas.97.25.13555" @default.
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