2h9c

Native Crystal Structure of the Isochorismate-Pyruvate Lyase from Pseudomonas aeruginosa

spinqualitylabelsall models 2h9c, resolution 2.35Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2h9c is a 2 chain structure with sequence from Pseudomonas aeruginosa PAO1. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.35Å Ligands: NO3 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function PCHB_PSEAE Has isochorismate-pyruvate lyase activity. Probably involved in the conversion of isochorismate to salicylate and pyruvate. 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 Enzymatic systems that exploit pericyclic reaction mechanisms are rare. A recent addition to this class is the enzyme PchB, an 11.4-kDa isochorismate pyruvate lyase from Pseudomonas aeruginosa. The apo and pyruvate-bound structures of PchB reveal that the enzyme is a structural homologue of chorismate mutases in the AroQalpha class despite low sequence identity (20%). The enzyme is an intertwined dimer of three helices with connecting loops, and amino acids from each monomer participate in each of two active sites. The apo structure (2.35 A resolution) has one dimer per asymmetric unit with nitrate bound in an open active site. The loop between the first and second helices is disordered, providing a gateway for substrate entry and product exit. The pyruvate-bound structure (1.95 A resolution) has two dimers per asymmetric unit. One has two open active sites like the apo structure, and the other has two closed active sites with the loop between the first and second helices ordered for catalysis. Determining the structure of PchB is part of a larger effort to elucidate protein structures involved in siderophore biosynthesis, as these enzymes are crucial for bacterial iron uptake and virulence and have been identified as antimicrobial drug targets. Two crystal structures of the isochorismate pyruvate lyase from Pseudomonas aeruginosa.,Zaitseva J, Lu J, Olechoski KL, Lamb AL J Biol Chem. 2006 Nov 3;281(44):33441-9. Epub 2006 Aug 16. PMID:16914555 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Isochorismate pyruvate lyase

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