2vqu

Structural and biochemical evidence for a boat-like transition state in beta-mannosidases

spinqualitylabelsall models 2vqu, resolution 1.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2vqu is a 2 chain structure with sequence from Bacteroides thetaiotaomicron. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.9Å Ligands: BR, CL, EDO, NOY Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q8AAK6_BACTN 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 Enzyme inhibition through mimicry of the transition state is a major area for the design of new therapeutic agents. Emerging evidence suggests that many retaining glycosidases that are active on alpha- or beta-mannosides harness unusual B2,5 (boat) transition states. Here we present the analysis of 25 putative beta-mannosidase inhibitors, whose Ki values range from nanomolar to millimolar, on the Bacteroides thetaiotaomicron beta-mannosidase BtMan2A. B2,5 or closely related conformations were observed for all tightly binding compounds. Subsequent linear free energy relationships that correlate log Ki with log Km/kcat for a series of active center variants highlight aryl-substituted mannoimidazoles as powerful transition state mimics in which the binding energy of the aryl group enhances both binding and the degree of transition state mimicry. Support for a B2,5 transition state during enzymatic beta-mannosidase hydrolysis should also facilitate the design and exploitation of transition state mimics for the inhibition of retaining alpha-mannosidases--an area that is emerging for anticancer therapeutics. Structural and biochemical evidence for a boat-like transition state in beta-mannosidases.,Tailford LE, Offen WA, Smith NL, Dumon C, Morland C, Gratien J, Heck MP, Stick RV, Bleriot Y, Vasella A, Gilbert HJ, Davies GJ Nat Chem Biol. 2008 May;4(5):306-12. PMID:18408714 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Mannosidase 3D structures

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