1ezi

Structure of a sialic acid activating synthetase, CMP acylneuraminate synthetase in the presence and absence of CDP

spinqualitylabelsall models 1ezi, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1ezi is a 2 chain structure with sequence from "diplokokkus_intracellularis_meningitidis"_(sic)_weichselbaum_1887 "diplokokkus intracellularis meningitidis" (sic) weichselbaum 1887. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. NonStd Res: MSE Related: 1eyr Activity: N-acylneuraminate cytidylyltransferase, with EC number 2.7.7.43 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT 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 x-ray crystallographic structure of selenomethionyl cytosine-5'-monophosphate-acylneuraminate synthetase (CMP-NeuAc synthetase) from Neisseria meningitidis has been determined at 2.0-A resolution using multiple-wavelength anomalous dispersion phasing, and a second structure, in the presence of the substrate analogue CDP, has been determined at 2.2-A resolution by molecular replacement. This work identifies the active site residues for this class of enzyme for the first time. The detailed interactions between the enzyme and CDP within the mononucleotide-binding pocket are directly observed, and the acylneuraminate-binding pocket has also been identified. A model of acylneuraminate bound to CMP-NeuAc synthetase has been constructed and provides a structural basis for understanding the mechanism of production of "activated" sialic acids. Sialic acids are key saccharide components on the surface of mammalian cells and can be virulence factors in a variety of bacterial species (e.g. Neisseria, Haemophilus, group B streptococci, etc.). As such, the identification of the bacterial CMP-NeuAc synthetase active site can serve as a starting point for rational drug design strategies. Structure of a sialic acid-activating synthetase, CMP-acylneuraminate synthetase in the presence and absence of CDP.,Mosimann SC, Gilbert M, Dombroswki D, To R, Wakarchuk W, Strynadka NC J Biol Chem. 2001 Mar 16;276(11):8190-6. Epub 2000 Dec 11. PMID:11113120 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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