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1e36

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[[Image:1e36.gif|left|200px]]
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{{Seed}}
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[[Image:1e36.png|left|200px]]
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{{STRUCTURE_1e36| PDB=1e36 | SCENE= }}
{{STRUCTURE_1e36| PDB=1e36 | SCENE= }}
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'''PORCINE PANCREATIC ELASTASE COMPLEXED WITH (3S, 4S)N-PARA-NITROBENZENESULPHONYL-3-ETHYL-4-(CARBOXYLIC ACID)PYRROLIDIN-2-ONE'''
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===PORCINE PANCREATIC ELASTASE COMPLEXED WITH (3S, 4S)N-PARA-NITROBENZENESULPHONYL-3-ETHYL-4-(CARBOXYLIC ACID)PYRROLIDIN-2-ONE===
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==Overview==
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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.
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The line below this paragraph, {{ABSTRACT_PUBMED_11023818}}, adds the Publication Abstract to the page
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(as it appears on PubMed at http://www.pubmed.gov), where 11023818 is the PubMed ID number.
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{{ABSTRACT_PUBMED_11023818}}
==About this Structure==
==About this Structure==
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[[Category: Serine protease]]
[[Category: Serine protease]]
[[Category: Serine proteinase]]
[[Category: Serine proteinase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 14:36:05 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 00:04:13 2008''

Revision as of 21:04, 30 June 2008

Image:1e36.png

Template:STRUCTURE 1e36

PORCINE PANCREATIC ELASTASE COMPLEXED WITH (3S, 4S)N-PARA-NITROBENZENESULPHONYL-3-ETHYL-4-(CARBOXYLIC ACID)PYRROLIDIN-2-ONE

Template:ABSTRACT PUBMED 11023818

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

Page seeded by OCA on Tue Jul 1 00:04:13 2008

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