1ebv: Difference between revisions

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[[Image:1ebv.jpg|left|200px]]
{{Seed}}
[[Image:1ebv.png|left|200px]]


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{{STRUCTURE_1ebv|  PDB=1ebv  |  SCENE=  }}  
{{STRUCTURE_1ebv|  PDB=1ebv  |  SCENE=  }}  


'''OVINE PGHS-1 COMPLEXED WITH SALICYL HYDROXAMIC ACID'''
===OVINE PGHS-1 COMPLEXED WITH SALICYL HYDROXAMIC ACID===




==Overview==
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Aspirin is unique among clinically used nonsteroidal antiinflammatory drugs in that it irreversibly inactivates prostaglandin (PG) H2 synthase (PGHS) via acetylation of an active-site serine residue. We report the synthesis and characterization of a novel acetylating agent, O-acetylsalicylhydroxamic acid (AcSHA), which inhibits PGE2 synthesis in vivo and blocks the cyclooxygenase activity of PGHS in vitro. AcSHA requires the presence of the active-site residue Ser-529 to be active against human PGHS-1; the S529A mutant is resistant to inactivation by the inhibitor. Analysis of PGHS inactivation by AcSHA, coupled with the X-ray crystal structure of the complex of ovine PGHS-1 with AcSHA, confirms that the inhibitor elicits its effects via acetylation of Ser-529 in the cyclooxygenase active site. The crystal structure reveals an intact inhibitor molecule bound in the enzyme's cyclooxygenase active-site channel, hydrogen bonding with Arg-119 of the enzyme. The structure-activity profile of AcSHA can be rationalized in terms of the crystal structure of the enzyme-ligand complex. AcSHA may prove useful as a lead compound to facilitate the development of new acetylating inhibitors.
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{{ABSTRACT_PUBMED_11723249}}


==About this Structure==
==About this Structure==
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[[Category: Sharkey, C T.]]
[[Category: Sharkey, C T.]]
[[Category: Monotopic membrane protein]]
[[Category: Monotopic membrane protein]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 14:55:01 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 00:28:11 2008''

Revision as of 21:28, 30 June 2008

File:1ebv.png

Template:STRUCTURE 1ebv

OVINE PGHS-1 COMPLEXED WITH SALICYL HYDROXAMIC ACID

Template:ABSTRACT PUBMED 11723249

About this Structure

1EBV is a Single protein structure of sequence from Ovis aries. Full crystallographic information is available from OCA.

Reference

O-acetylsalicylhydroxamic acid, a novel acetylating inhibitor of prostaglandin H2 synthase: structural and functional characterization of enzyme-inhibitor interactions., Loll PJ, Sharkey CT, O'Connor SJ, Dooley CM, O'Brien E, Devocelle M, Nolan KB, Selinsky BS, Fitzgerald DJ, Mol Pharmacol. 2001 Dec;60(6):1407-13. PMID:11723249

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