1e36
From Proteopedia
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|PDB= 1e36 |SIZE=350|CAPTION= <scene name='initialview01'>1e36</scene>, resolution 1.70Å | |PDB= 1e36 |SIZE=350|CAPTION= <scene name='initialview01'>1e36</scene>, resolution 1.70Å | ||
|SITE= <scene name='pdbsite=CAT:Catalytic+Site'>CAT</scene> | |SITE= <scene name='pdbsite=CAT:Catalytic+Site'>CAT</scene> | ||
| - | |LIGAND= <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene> | + | |LIGAND= <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>, <scene name='pdbligand=TPY:(2S,3S)-3-FORMYL-2-({[(4-NITROPHENYL)SULFONYL]AMINO}METHYL)PENTANOIC+ACID'>TPY</scene> |
| - | |ACTIVITY= [http://en.wikipedia.org/wiki/Pancreatic_elastase Pancreatic elastase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.21.36 3.4.21.36] | + | |ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Pancreatic_elastase Pancreatic elastase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.21.36 3.4.21.36] </span> |
|GENE= | |GENE= | ||
| + | |DOMAIN= | ||
| + | |RELATEDENTRY= | ||
| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1e36 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1e36 OCA], [http://www.ebi.ac.uk/pdbsum/1e36 PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1e36 RCSB]</span> | ||
}} | }} | ||
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[[Category: Wilmouth, R C.]] | [[Category: Wilmouth, R C.]] | ||
[[Category: Wright, P A.]] | [[Category: Wright, P A.]] | ||
| - | [[Category: CA]] | ||
| - | [[Category: SO4]] | ||
| - | [[Category: TPY]] | ||
[[Category: hydrolase]] | [[Category: hydrolase]] | ||
[[Category: serine protease]] | [[Category: serine protease]] | ||
[[Category: serine proteinase]] | [[Category: serine proteinase]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 19:54:02 2008'' |
Revision as of 16:54, 30 March 2008
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| , resolution 1.70Å | |||||||
|---|---|---|---|---|---|---|---|
| Sites: | |||||||
| Ligands: | , , | ||||||
| Activity: | Pancreatic elastase, with EC number 3.4.21.36 | ||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
PORCINE PANCREATIC ELASTASE COMPLEXED WITH (3S, 4S)N-PARA-NITROBENZENESULPHONYL-3-ETHYL-4-(CARBOXYLIC ACID)PYRROLIDIN-2-ONE
Overview
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.
About this Structure
1E36 is a Single protein structure of sequence from Sus scrofa. Full crystallographic information is available from OCA.
Reference
'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
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