3nvd

Structure of YBBD in complex with pugnac

spinqualitylabelsall models 3nvd, resolution 1.84Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3nvd is a 2 chain structure with sequence from Bacillus subtilis. This structure supersedes the now removed PDB entry 3cqm. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ACT, NA, OAN, PG4 Related: 3bmx Gene: ybbD (Bacillus subtilis) Activity: Beta-N-acetylhexosaminidase, with EC number 3.2.1.52 Resources: FirstGlance, OCA, RCSB, PDBsum Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Three-dimensional structures of NagZ of Bacillus subtilis, the first structures of a two-domain beta-N-acetylglucosaminidase of family 3 of glycosidases, were determined with and without the transition state mimicking inhibitor PUGNAc bound to the active site, at 1.84- and 1.40-A resolution, respectively. The structures together with kinetic analyses of mutants revealed an Asp-His dyad involved in catalysis: His(234) of BsNagZ acts as general acid/base catalyst and is hydrogen bonded by Asp(232) for proper function. Replacement of both His(234) and Asp(232) with glycine reduced the rate of hydrolysis of the fluorogenic substrate 4'-methylumbelliferyl N-acetyl-beta-D-glucosaminide 1900- and 4500-fold, respectively, and rendered activity pH-independent in the alkaline range consistent with a role of these residues in acid/base catalysis. N-Acetylglucosaminyl enzyme intermediate accumulated in the H234G mutant and beta-azide product was formed in the presence of sodium azide in both mutants. The Asp-His dyad is conserved within beta-N-acetylglucosaminidases but otherwise absent in beta-glycosidases of family 3, which instead carry a "classical" glutamate acid/base catalyst. The acid/base glutamate of Hordeum vulgare exoglucanase (Exo1) superimposes with His(234) of the dyad of BsNagZ and, in contrast to the latter, protrudes from a second domain of the enzyme into the active site. This is the first report of an Asp-His catalytic dyad involved in hydrolysis of glycosides resembling in function the Asp-His-Ser triad of serine proteases. Our findings will facilitate the development of mechanism-based inhibitors that selectively target family 3 beta-N-acetylglucosaminidases, which are involved in bacterial cell wall turnover, spore germination, and induction of beta-lactamase. Structural and kinetic analysis of Bacillus subtilis N-acetylglucosaminidase reveals a unique Asp-His dyad mechanism.,Litzinger S, Fischer S, Polzer P, Diederichs K, Welte W, Mayer C J Biol Chem. 2010 Nov 12;285(46):35675-84. Epub 2010 Sep 7. PMID:20826810 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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