1glg

CRYSTALLOGRAPHIC ANALYSIS OF THE EPIMERIC AND ANOMERIC SPECIFICITY OF THE PERIPLASMIC TRANSPORT(SLASH)CHEMOTACTIC PROTEIN RECEPTOR FOR D-GLUCOSE AND D-GALACTOSE

spinqualitylabelsall models 1glg, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1glg is a 1 chain structure with sequence from "bacillus_coli"_migula_1895 "bacillus coli" migula 1895. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA, GAL Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [DGAL_ECOLI] This protein is involved in the active transport of galactose and glucose. It plays a role in the chemotaxis towards the two sugars by interacting with the trg chemoreceptor. 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 The D-glucose/D-galactose-binding protein (M(r) = 33,000) found in the periplasm of bacterial cells serves as the primary high-affinity receptor of active transport for and chemotaxis toward both sugar epimers. This protein from Escherichia coli binds D-glucose with a Kd of 2 x 10(-7) M, which is about 2 times tighter than D-galactose. The 2.0-A resolution crystal structure of the binding protein complexed with D-galactose has been refined to a crystallographic R-factor of 0.167. This structure, combined with that previously refined for the complex with D-glucose [Vyas, N.K., Vyas., M. N., & Quiocho, F. A. (1988) Science 242, 1290-1295], provides understanding, in atomic detail, of recognition of sugar epimers and anomers. In the two complex structures, the sugar ring is positioned identically in the binding site, and each hydroxyl group common to both is involved in very similar cooperative hydrogen-bonding interactions with protein residues and ordered water molecules. Only the beta-anomer of both monosaccharides is bound, with Asp154 OD1 primarily responsible for accepting a hydrogen bond from the anomeric hydroxyl. Recognition of both sugar epimers is accomplished principally by hydrogen bonding of Asp14 OD1 with the equatorial OH4 of D-glucose and OD2 with the axial OH4 of D-galactose. These results are reconciled with equilibrium and fast kinetics data, which indicate binding of both anomers of the two sugars, and further compared with sugar recognition by other periplasmic sugar-binding proteins with specificities for arabinose/galactose/fucose, maltooligosaccharides, and ribose. Crystallographic analysis of the epimeric and anomeric specificity of the periplasmic transport/chemosensory protein receptor for D-glucose and D-galactose.,Vyas MN, Vyas NK, Quiocho FA Biochemistry. 1994 Apr 26;33(16):4762-8. PMID:8161535 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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