3wbe

Rice Os3BGlu6 Beta-Glucosidase E178Q mutant in a covalent complex with Glc from GA4GE.

spinqualitylabelsall models 3wbe, resolution 1.97Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3wbe is a 1 chain structure with sequence from Oryza sativa Japonica Group. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.97Å Ligands: GLC, GOL Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function BGL06_ORYSJ Hydrolyzes glycosides, oligosaccharides and hydrophobic glycosides. Publication Abstract from PubMed In order to identify a rice gibberellin ester beta-d-glucosidase, gibberellin A4 beta-d-glucosyl ester (GA4-GE) was synthesized and used to screen rice beta-glucosidases. Os3BGlu6 was found to have the highest hydrolysis activity to GA4-GE among five recombinantly expressed rice glycoside hydrolase family GH1 enzymes from different phylogenic clusters. The kinetic parameters of Os3BGlu6 and its mutants E178Q, E178A, E394D, E394Q and M251N for hydrolysis of p-nitrophenyl beta-d-glucopyranoside (pNPGlc) and GA4-GE confirmed the roles of the catalytic acid/base and nucleophile for hydrolysis of both substrates and suggested M251 contributes to binding hydrophobic aglycones. The activities of the Os3BGlu6 E178Q and E178A acid/base mutants were rescued by azide, which they transglucosylate to produce beta-d-glucopyranosyl azide, in a pH-dependent manner, while acetate also rescued Os3BGlu6 E178A at low pH. High concentrations of sodium azide (200-400mM) inhibited Os3BGlu6 E178Q but not Os3BGlu6 E178A. The structures of Os3BGlu6 E178Q crystallized with either GA4-GE or pNPGlc had a native alpha-d-glucosyl moiety covalently linked to the catalytic nucleophile, E394, which showed the hydrogen bonding to the 2-hydroxyl in the covalent intermediate. These data suggest that a GH1 beta-glucosidase uses the same retaining catalytic mechanism to hydrolyze 1-O-acyl glucose ester and glucoside. Enzymatic and structural characterization of hydrolysis of gibberellin A4 glucosyl ester by a rice beta-d-glucosidase.,Hua Y, Sansenya S, Saetang C, Wakuta S, Ketudat Cairns JR Arch Biochem Biophys. 2013 Sep 1;537(1):39-48. doi: 10.1016/j.abb.2013.06.005., Epub 2013 Jun 26. PMID:23811195 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Beta-glucosidase 3D structures

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