1mkv | pdb_00001mkv

CARBOXYLIC ESTER HYDROLASE COMPLEX (PLA2 + TRANSITION STATE ANALOG COMPLEX)

spinqualitylabelsall models 1mkv, resolution 1.89Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1mkv is a 1 chain structure with sequence from Bovin. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA, GEL Gene: MATURE PLA2 (BOVIN) Activity: Phospholipase A(2), with EC number 3.1.1.4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [PA21B_BOVIN] PA2 catalyzes the calcium-dependent hydrolysis of the 2-acyl groups in 3-sn-phosphoglycerides. 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 1.89 A resolution structure of the complex of bovine pancreatic phospholipase A2 (PLA2) with the transition-state analogue L-1-O-octyl-2-heptylphosphonyl-sn-glycero-3-phosphoethanolamine (TSA) has been determined. The crystal of the complex is trigonal, space group P3121, a = b = 46.58 and c = 102.91 A and isomorphous to the native recombinant wild type (WT). The structure was refined to a final crystallographic R value of 18.0% including 957 protein atoms, 88 water molecules, one calcium ion and all 31 non-H atoms of the inhibitor at 1.89 A resolution. In all, 7 726 reflections [F>2sigma(F)] were used between 8.0 and 1.89 A resolution. The inhibitor is deeply locked into the active-site cleft and coordinates to the calcium ion by displacing the two water molecules in the calcium pentagonal bipyramid by the anionic O atoms of the phosphate and phosphonate group. The hydroxyl group of Tyr69 hydrogen bonds to the second anionic O atom of the phosphate group while that of the phosphonate group replaces the third water, 'catalytic' water, which forms a hydrogen bond to Ndelta1 of His48. The fourth water which also shares Ndelta1 of His48 is displaced by the steric hinderance of the inhibitor. The fifth conserved structural water is still present in the active site and forms a network of hydrogen bonds with the surrounding residues. The structure is compared to the other known TSA-PLA2 complexes. Structure of the complex of bovine pancreatic phospholipase A2 with a transition-state analogue.,Sekar K, Kumar A, Liu X, Tsai MD, Gelb MH, Sundaralingam M Acta Crystallogr D Biol Crystallogr. 1998 May 1;54(Pt 3):334-41. PMID:9761900 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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