3ag6

Crystal Structure of Pantothenate Synthetase from Staphylococcus aureus in complex with pantoyl adenylate

spinqualitylabelsall models 3ag6, resolution 1.85Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3ag6 is a 2 chain structure with sequence from Staphylococcus aureus subsp. aureus nctc 8325. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ACY, PAJ, PG4 Related: 3ag5 Gene: panC, SAOUHSC_02918 (Staphylococcus aureus subsp. aureus NCTC 8325) Activity: Pantoate--beta-alanine ligase, with EC number 6.3.2.1 Resources: FirstGlance, OCA, RCSB, PDBsum Function [PANC_STAA8] Catalyzes the condensation of pantoate with beta-alanine in an ATP-dependent reaction via a pantoyl-adenylate intermediate (By similarity). 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 Pantothenate synthetase (PS, EC 6.3.2.1) is the last enzyme in the pantothenate biosynthesis pathway, a metabolic pathway identified as a potential target for new antimicrobials. PS catalyzes the ATP-dependent condensation of pantoate and beta-alanine to form pantothenate. Here we report the overexpression, purification, enzyme assay, and tertiary structure of PS from Staphylococcus aureus. PS activity was experimentally confirmed, indicating a k(cat) value comparable to those of enzymes from other organisms. The structures of the apoenzyme and the reaction intermediate (pantoyl adenylate; PA) complex were determined by X-ray crystallography to resolutions of 2.5 and 1.85 A, respectively. Structural analysis indicated that the apoenzyme adopts an open and relatively mobile structure, while the complex structure is closed and entirely rigid. Structural comparison of the apoenzyme and the complex revealed how S. aureus PS undergoes open/close conformational change, and also determined the key interactions with the adenine ring of PA for a hinge bending domain closure. In the complex structure, PA and acetate are bound in the active site. We suggest that the acetate mimics the substrate beta-alanine. Therefore, the complex structure seems to represent a catalytic state poised for in-line nucleophilic attack on PA. These data also offer an alternative strategy for designing novel compounds that selectively inhibit PS activity. Substrate-Induced Closing of the Active Site Revealed by the Crystal Structure of Pantothenate Synthetase from Staphylococcus aureus.,Satoh A, Konishi S, Tamura H, Stickland HG, Whitney HM, Smith AG, Matsumura H, Inoue T Biochemistry. 2010 Jul 8. PMID:20568730 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Pantothenate synthetase

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