3o03

Quaternary complex structure of gluconate 5-dehydrogenase from streptococcus suis type 2

spinqualitylabelsall models 3o03, resolution 1.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3o03 is a 1 chain structure with sequence from Streptococcus suis 05ZYH33. This structure supersedes the now removed PDB entry 3cxt. 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: CA, GCO, NAP Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A4VVQ2_STRSY Publication Abstract from PubMed Gluconate 5-dehydrogenase (Ga5DH) is an NADP(H)-dependent enzyme that catalyzes a reversible oxidoreduction reaction between D-gluconate and 5-keto-D-gluconate, thereby regulating the flux of this important carbon and energy source in bacteria. Despite the considerable amount of physiological and biochemical knowledge of Ga5DH, there is little physical or structural information available for this enzyme. To this end, we herein report the crystal structures of Ga5DH from pathogenic Streptococcus suis serotype 2 in both substrate-free and liganded (NADP(+)/D-gluconate/metal ion) quaternary complex forms at 2.0 A resolution. Structural analysis reveals that Ga5DH adopts a protein fold similar to that found in members of the short chain dehydrogenase/reductase (SDR) family, while the enzyme itself represents a previously uncharacterized member of this family. In solution, Ga5DH exists as a tetramer that comprised four identical approximately 29 kDa subunits. The catalytic site of Ga5DH shows considerable architectural similarity to that found in other enzymes of the SDR family, but the S. suis protein contains an additional residue (Arg104) that plays an important role in the binding and orientation of substrate. The quaternary complex structure provides the first clear crystallographic evidence for the role of a catalytically important serine residue and also reveals an amino acid tetrad RSYK that differs from the SYK triad found in the majority of SDR enzymes. Detailed analysis of the crystal structures reveals important contributions of Ca(2+) ions to active site formation and of specific residues at the C-termini of subunits to tetramer assembly. Because Ga5DH is a potential target for therapy, our findings provide insight not only of catalytic mechanism, but also suggest a target of structure-based drug design. Structural insight into the catalytic mechanism of gluconate 5-dehydrogenase from Streptococcus suis: Crystal structures of the substrate-free and quaternary complex enzymes.,Zhang Q, Peng H, Gao F, Liu Y, Cheng H, Thompson J, Gao GF Protein Sci. 2009 Feb;18(2):294-303. PMID:19177572 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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