1e35 | pdb_00001e35

PORCINE PANCREATIC ELASTASE COMPLEXED WITH (3S, 4S)N-PARA-TOLUENESULPHONYL -3-ETHYL-4-(CARBOXYLIC ACID)PYRROLIDIN-2-ONE SOAKED IN PH 9 BUFFER FOR TWO MINUTES

spinqualitylabelsall models 1e35, resolution 1.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1e35 is a 1 chain structure with sequence from Sus scrofa. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA, SO4, TPX Related: 3est, 1qgf, 1e34, 1e36, 1e37, 1e38, 1est, 2est, 4est, 5est, 6est, 7est, 8est, 9est, 1inc, 1jim, 1ela, 1elb, 1elc, 1eld, 1ele, 1elf, 1elg, 1esa, 1esb, 1eai, 1eas, 1eat, 1eau, 1bma, 1lvy, 1nes, 1b0e, 1btu Activity: Pancreatic elastase, with EC number 3.4.21.36 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [CELA1_PIG] Acts upon elastin. 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 beta-Lactams inhibit a range of enzymes via acylation of nucleophilic serine residues. Certain gamma-lactam analogues of monocyclic beta-lactams have also been shown to be reversible inhibitors of porcine pancreatic elastase (PPE), forming acyl-enzyme complexes that are stable with respect to hydrolysis. Crystallographic analysis at pH 5 of an acyl-enzyme complex formed with PPE and one of these inhibitors revealed the ester carbonyl located in the oxyanion hole in a similar conformation to that observed in the structure of a complex formed between a heptapeptide (beta-casomorphin-7) and PPE. Only weak electron density was observed for the His-57 side chain in its 'native' conformation. Instead, the His-57 side chain predominantly adopted a conformation rotated approx. 90 degrees from its normal position. PPE-gamma-lactam crystals were subjected to 'pH-jumps' by placing the crystals in a buffer of increased pH prior to freezing for data collection. The results indicate that the conformation of the gamma-lactam-derived acyl-enzyme species in the PPE active site is dependent on pH, a result having implications for the analysis of other serine protease-inhibitor structures at non-catalytic pH values. The results help to define the stereoelectronic relationship between the ester of the acyl-enzyme complex, the side chain of His-57 and the incoming nucleophile during the reversible (de)acylation steps, implying it is closely analogous to the hydrolytic deacylation step during catalytic peptide hydrolysis. 'pH-jump' crystallographic analyses of gamma-lactam-porcine pancreatic elastase complexes.,Wright PA, Wilmouth RC, Clifton IJ, Schofield CJ Biochem J. 2000 Oct 15;351 Pt 2:335-40. PMID:11023818 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Elastase 3D structures

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