2q0k

Oxidized thioredoxin reductase from Helicobacter pylori in complex with NADP+

spinqualitylabelsall models 2q0k, resolution 1.70Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2q0k is a 2 chain structure with sequence from Helicobacter pylori 26695. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.7Å Ligands: FAD, NAP Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function TRXB_HELPY 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 crystal structures of homodimeric thioredoxin reductase (TrxR) from the gastric pathogen Helicobacter pylori in complex with NADP(+) have been determined for the oxidized and reduced form of the enzyme at 1.7 and 1.45 A resolution, respectively. The enzyme subunit is built up of FAD- and NAD(P)H-binding domains, each of which contain variants of the Rossmann fold typical of nucleotide-binding proteins. The majority of the amino-acid residues binding the cofactors FAD and NAD(P)H are conserved in the low-molecular-weight thioredoxin reductases. In the reduced species the isoalloxazine ring of FAD is bent along an axis passing through the N5 and N10 atoms with an angle of 22 degrees and the ribityl moiety adopts an unusual conformation. Well defined electron density shows the position of the whole NADP(+) molecule with a binding mode similar to that observed in the Escherichia coli TrxR-thioredoxin complex, although the orientation of the NAD(P)H-binding domain is different. Rigid-body rotation of this domain to the orientation observed in the E. coli TrxR-thioredoxin complex positions NADP(+) adjacent to the FAD molecule, suitable for electron transfer, without any readjustments of the conformation of NADP(+). A comparison of the binding surfaces of thioredoxin and thioredoxin reductases from H. pylori and E. coli shows that the overall surface charge distribution in these proteins is conserved and that residue substitutions that change the shape of the binding surface may account for the species-specific recognition of thioredoxin by TrxR. High-resolution structures of oxidized and reduced thioredoxin reductase from Helicobacter pylori.,Gustafsson TN, Sandalova T, Lu J, Holmgren A, Schneider G Acta Crystallogr D Biol Crystallogr. 2007 Jul;63(Pt 7):833-43. Epub 2007, Jun 15. PMID:17582174 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Thioredoxin reductase 3D structures

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