1fw3 | pdb_00001fw3

OUTER MEMBRANE PHOSPHOLIPASE A FROM ESCHERICHIA COLI

spinqualitylabelsall models 1fw3, resolution 2.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1fw3 is a 2 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. NonStd Res: S1H Related: 1qd5, 1qd6, 1fw2 Activity: Phospholipase A(1), with EC number 3.1.1.32 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [PA1_ECOLI] Has broad substrate specificity including hydrolysis of phosphatidylcholine with phospholipase A2 (EC 3.1.1.4) and phospholipase A1 (EC 3.1.1.32) activities. Strong expression leads to outer membrane breakdown and cell death; is dormant in normal growing cells. Required for efficient secretion of bacteriocins. 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 Outer membrane phospholipase A (OMPLA) is an integral membrane enzyme that catalyses the hydrolysis of phospholipids. Enzymatic activity is regulated by reversible dimerisation and calcium-binding. We have investigated the role of calcium by X-ray crystallography. In monomeric OMPLA, one calcium ion binds between two external loops (L3L4 site) at 10 A from the active site. After dimerisation, a new calcium-binding site (catalytic site) is formed at the dimer interface in the active site of each molecule at 6 A from the L3L4 calcium site. The close spacing and the difference in calcium affinity of both sites suggests that the L3L4 site may function as a storage site for a calcium ion, which relocates to the catalytic site upon dimerisation. A sequence alignment demonstrates conservation of the catalytic calcium site but evolutionary variation of the L3L4 site. The residues in the dimer interface are conserved as well, suggesting that all outer membrane phospholipases require dimerisation and calcium in the catalytic site for activity. For this family of phospholipases, we have characterised a consensus sequence motif (YTQ-X(n)-G-X(2)-H-X-SNG) that contains conserved residues involved in dimerisation and catalysis. Structural investigations of calcium binding and its role in activity and activation of outer membrane phospholipase A from Escherichia coli.,Snijder HJ, Kingma RL, Kalk KH, Dekker N, Egmond MR, Dijkstra BW J Mol Biol. 2001 Jun 1;309(2):477-89. PMID:11371166 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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