2c1i

Structure of Streptococcus pneumoniae peptidoglycan deacetylase (SpPgdA) D 275 N Mutant.

spinqualitylabelsall models 2c1i, resolution 1.35Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2c1i is a 1 chain structure with sequence from Streptococcus pneumoniae R6. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.35Å Ligands: MES, SO4, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function PGDA_STRR6 Catalyzes the deacetylation of N-acetylglucosamine (GlcNAc) residues in peptidoglycan, a modification that confers host lysozyme resistance and contributes to pneumococcal virulence. 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 Streptococcus pneumoniae peptidoglycan GlcNAc deacetylase (SpPgdA) protects the Gram-positive bacterial cell wall from host lysozymes by deacetylating peptidoglycan GlcNAc residues. Deletion of the pgda gene has been shown to result in hypersensitivity to lysozyme and reduction of infectivity in a mouse model. SpPgdA is a member of the family 4 carbohydrate esterases, for which little structural information exists, and no catalytic mechanism has yet been defined. Here we describe the native crystal structure and product complexes of SpPgdA biochemical characterization and mutagenesis. The structural data show that SpPgdA is an elongated three-domain protein in the crystal. The structure, in combination with mutagenesis, shows that SpPgdA is a metalloenzyme using a His-His-Asp zinc-binding triad with a nearby aspartic acid and histidine acting as the catalytic base and acid, respectively, somewhat similar to other zinc deacetylases such as LpxC. The enzyme is able to accept GlcNAc(3) as a substrate (K(m) = 3.8 mM, k(cat) = 0.55 s(-1)), with the N-acetyl of the middle sugar being removed by the enzyme. The data described here show that SpPgdA and the other family 4 carbohydrate esterases are metalloenzymes and present a step toward identification of mechanism-based inhibitors for this important class of enzymes. Structure and metal-dependent mechanism of peptidoglycan deacetylase, a streptococcal virulence factor.,Blair DE, Schuttelkopf AW, MacRae JI, van Aalten DM Proc Natl Acad Sci U S A. 2005 Oct 25;102(43):15429-34. Epub 2005 Oct 12. PMID:16221761 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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