3rem

Structure of the Isochorismate-Pyruvate Lyase from Pseudomonas aerugionsa with Bound Salicylate and Pyruvate

spinqualitylabelsall models 3rem, resolution 1.95Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3rem is a 2 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 1.95Å Ligands: PYR, SAL 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. Publication Abstract from PubMed An isochorismate-pyruvate lyase with adventitious chorismate mutase activity from Pseudomonas aerugionsa (PchB) achieves catalysis of both pericyclic reactions in part by the stabilization of reactive conformations and in part by electrostatic transition-state stabilization. When the active site loop Lys42 is mutated to histidine, the enzyme develops a pH dependence corresponding to a loss of catalytic power upon deprotonation of the histidine. Structural data indicate that the change is not due to changes in active site architecture, but due to the difference in charge at this key site. With loss of the positive charge on the K42H side chain at high pH, the enzyme retains lyase activity at approximately 100-fold lowered catalytic efficiency but loses detectable mutase activity. We propose that both substrate organization and electrostatic transition state stabilization contribute to catalysis. However, the dominant reaction path for catalysis is dependent on reaction conditions, which influence the electrostatic properties of the enzyme active site amino acid side chains. pH Dependence of Catalysis by Pseudomonas aeruginosa Isochorismate-Pyruvate Lyase: Implications for Transition State Stabilization and the Role of Lysine 42.,Olucha J, Ouellette AN, Luo Q, Lamb AL Biochemistry. 2011 Jul 22. PMID:21751784 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Isochorismate pyruvate lyase

Proteopedia Page Contributors and Editors (what is this?)

OCA