4ojy | pdb_00004ojy

3D structure of the E323A catalytic mutant of Gan42B, a GH42 beta-galactosidase from G. stearothermophilus

spinqualitylabelsall models 4ojy, resolution 2.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4ojy is a 3 chain structure with sequence from Atcc 12980. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: GOL, ZN Related: 4oif Gene: gan42B, ganB (ATCC 12980) Activity: Beta-galactosidase, with EC number 3.2.1.23 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Geobacillus stearothermophilus T-6 is a Gram-positive thermophilic soil bacterium that contains a multi-enzyme system for the utilization of plant cell-wall polysaccharides, including xylan, arabinan and galactan. The bacterium uses a number of endo-acting extracellular enzymes that break down the high-molecular-weight polysaccharides into decorated oligosaccharides. These oligosaccharides enter the cell and are further hydrolyzed into sugar monomers by a set of intracellular glycoside hydrolases. One of these intracellular degrading enzymes is GanB, a glycoside hydrolase family 42 beta-galactosidase capable of hydrolyzing short beta-1,4-galactosaccharides to galactose. GanB and related enzymes therefore play an important part in the hemicellulolytic utilization system of many microorganisms which use plant biomass for growth. The interest in the biochemical characterization and structural analysis of these enzymes stems from their potential biotechnological applications. GanB from G. stearothermophilus T-6 has recently been cloned, overexpressed, purified, biochemically characterized and crystallized in our laboratory as part of its complete structure-function study. The best crystals obtained for this enzyme belong to the primitive orthorhombic space group P2(1)2(1)2(1), with average crystallographic unit-cell parameters of a=71.84, b=181.35, c=196.57 A. Full diffraction data sets to 2.45 and 2.50 A resolution have been collected for both the wild-type enzyme and its E323A nucleophile catalytic mutant, respectively, as measured from flash-cooled crystals at 100 K using synchrotron radiation. These data are currently being used for the full three-dimensional crystal structure determination of GanB. Crystallization and preliminary crystallographic analysis of GanB, a GH42 intracellular beta-galactosidase from Geobacillus stearothermophilus.,Solomon HV, Tabachnikov O, Feinberg H, Govada L, Chayen NE, Shoham Y, Shoham G Acta Crystallogr Sect F Struct Biol Cryst Commun. 2013 Oct;69(Pt 10):1114-9. doi:, 10.1107/S1744309113023609. Epub 2013 Sep 28. PMID:24100561 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Galactosidase

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