1w17

Structure of Bacillus subtilis PdaA, a family 4 Carbohydrate esterase.

spinqualitylabelsall models 1w17, resolution 1.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1w17 is a 2 chain structure with sequence from Bacillus subtilis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.9Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function PDAA_BACSU Catalyzes the deacetylation of N-acetylmuramic acid (MurNAc) residues in glycan strands of peptidoglycan, leading to the formation of muramic delta-lactam residues in spore cortex, after transpeptidation of deacetylated muramic acid residues. PdaA probably carries out both deacetylation and lactam ring formation and requires the product of CwlD activity on peptidoglycan as a substrate. Is required for germination. Cannot use chitin oligomer (hexa-N-acetylchitohexaose) as a substrate. 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 Family 4 carbohydrate esterases deacetylate polymeric carbohydrate substrates such as chitin, acetyl xylan and peptidoglycan. Although some of these enzymes have recently been enzymologically characterised, neither their structure nor their reaction mechanism has been defined. Sequence conservation in this family has pointed to a conserved core, termed the NodB homology domain. We describe the cloning, purification and 1.9 A crystal structure of PdaA, a peptidoglycan deacetylase from Bacillus subtilis. The enzyme assumes a fold related to a (beta/alpha)8 barrel, with a long groove on the surface of the protein that harbours all conserved residues. A complex with the substrate analogue N-acetyl-glucosamine was refined to 2.25 A resolution, revealing interactions of an aspartic acid and three histidines, all conserved in the NodB homology domain, with the ligand. The PdaA structure provides a template for interpreting the wealth of sequence data on family 4 carbohydrate esterases in a structural context and represents a first step towards understanding the reaction mechanism of this family of enzymes. Structures of Bacillus subtilis PdaA, a family 4 carbohydrate esterase, and a complex with N-acetyl-glucosamine.,Blair DE, van Aalten DM FEBS Lett. 2004 Jul 16;570(1-3):13-9. PMID:15251431 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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