2zws

Crystal Structure Analysis of neutral ceramidase from Pseudomonas aeruginosa

spinqualitylabelsall models 2zws, resolution 1.40Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2zws is a 1 chain structure with sequence from Pseudomonas aeruginosa. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.4Å Ligands: FMT, GOL, MG, PLM, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function NCASE_PSEAE Catalyzes the cleavage of the N-acyl linkage of the ceramides (Cers) to yield sphingosine (Sph) and free fatty acid at an optimal pH of 8-9. Also catalyzes the synthesis of Cers from Sph and fatty acid. 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 Ceramidase (CDase; EC 3.5.1.23) hydrolyzes ceramide to generate sphingosine and fatty acid. The enzyme plays a regulatory role in a variety of physiological events in eukaryotes and also functions as an exotoxin in particular bacteria. The crystal structures of neutral CDase from Pseudomonas aeruginosa (PaCD) in the C2-ceramide-bound and -unbound forms were determined at 2.2 and 1.4 A resolutions, respectively. PaCD consists of two domains, and the Zn(2+)- and Mg(2+)/Ca(2+)-binding sites are found within the center of the N-terminal domain and the interface between the domains, respectively. The structural comparison between the C2-ceramide-bound and unbound forms revealed an open-closed conformational change occurring to loop I upon binding of C2-ceramide. In the closed state, this loop sits above the Zn(2+) coordination site and over the opening to the substrate binding site. Mutational analyses of residues surrounding the Zn(2+) of PaCD and rat neutral CDase revealed that the cleavage or creation of the N-acyl linkage of ceramide follows a similar mechanism as observed for the Zn(2+)-dependent carboxypeptidases. The results provide an understanding of the molecular mechanism of hydrolysis and synthesis of ceramide by the enzyme. Furthermore, insights into the actions of PaCD and eukaryotic neutral CDases as an exotoxin and mediators of sphingolipid signaling are also revealed, respectively. Mechanistic insights into the hydrolysis and synthesis of ceramide by neutral ceramidase.,Inoue T, Okino N, Kakuta Y, Hijikata A, Okano H, Goda HM, Tani M, Sueyoshi N, Kambayashi K, Matsumura H, Kai Y, Ito M J Biol Chem. 2009 Apr 3;284(14):9566-77. Epub 2008 Dec 16. PMID:19088069 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Ceramidase Ceramidase 3D PDB structures

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