1uwt | pdb_00001uwt

STRUCTURE OF BETA-GLYCOSIDASE FROM SULFOLOBUS SOLFATARICUS IN COMPLEX WITH D-GALACTOHYDROXIMO-1,5-LACTAM

spinqualitylabelsall models 1uwt, resolution 1.95Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1uwt is a 2 chain structure with sequence from Sulfolobus solfataricus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ACT, GTL Related: 1gow, 1uwi, 1uwq, 1uwr, 1uws, 1uwu Activity: Beta-galactosidase, with EC number 3.2.1.23 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 Transition-state mimicry is increasingly important both to understand enzyme mechanism and to direct the synthesis of putative therapeutic agents. X-ray crystallography is able to provide vital information on the interactions between an enzyme and the potential inhibitor. Here we report the structures, at approximately 2 A resolution, of a family GH1 beta-glycosidase from the hyperthermophilic archaeon Sulfolobus solfataricus, in complex with both covalently (derived from 2-fluoro-glycosides) and noncovalently (hydroximolactam) bound inhibitors. The enzyme has broad specificity, accommodating both gluco- and galacto-configured substrates, and the crystallographic data demonstrate that the only difference in the way these ligands bind lies in the interactions between Gln18, Glu432, and Trp433, and the hydroxyl group at the O3 and O4 positions. Inhibition by the differently configured ligands was also shown to be extremely similar, with K(i) values of 1.04 and 1.08 microM for the gluco and galacto epimers, respectively. The noncovalently bound inhibitors have a trigonal anomeric carbon, adopt a (4)H(3) (half-chair) conformation, and an interaction is formed between O2 and the catalytic nucleophile, all of which contribute to (partial) mimicry of the oxocarbenium-ion-like transition state. The inhibition of the beta-glycosidase from S. solfataricus by hydroximolactams is discussed in light of the emerging work on family GH1 glycosidase inhibition by a spectrum of putative transition-state mimics. Structural studies of the beta-glycosidase from Sulfolobus solfataricus in complex with covalently and noncovalently bound inhibitors.,Gloster TM, Roberts S, Ducros VM, Perugino G, Rossi M, Hoos R, Moracci M, Vasella A, Davies GJ Biochemistry. 2004 May 25;43(20):6101-9. PMID:15147194 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Galactosidase

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