Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Protein Workshop | Ligand Explorer

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 65250.47 
• Atom Count: 4594 
• Residue Count: 551 
• Unique protein chains: 1

1EBV

OVINE PGHS-1 COMPLEXED WITH SALICYL HYDROXAMIC ACID

• DOI: 10.2210/pdb1EBV/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Ovis aries


• Deposited: 2000-01-24 Released: 2000-02-24 
• Deposition Author(s): Loll, P.J., Sharkey, C.T., O'Connor, S.J., Fitzgerald, D.J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.2 Å
• R-Value Free: 0.248 
• R-Value Work: 0.218 

Literature

O-acetylsalicylhydroxamic acid, a novel acetylating inhibitor of prostaglandin H2 synthase: structural and functional characterization of enzyme-inhibitor interactions.

Loll, P.J., Sharkey, C.T., O'Connor, S.J., Dooley, C.M., O'Brien, E., Devocelle, M., Nolan, K.B., Selinsky, B.S., Fitzgerald, D.J.

(2001) Mol.Pharmacol. 60: 1407-1413

• PubMed: 11723249 


• PubMed Abstract: 
  

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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Organizational Affiliation: 

Department of Pharmacology, University of Pennsylvania School of Medicine, Philadelphia, PA, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
PROSTAGLANDIN H2 SYNTHASE	A	551	Ovis aries	Gene Names: PTGS1 (COX1) EC: 1.14.99.1
Membrane protein mpstruct	Group:  MONOTOPIC MEMBRANE PROTEINS		Sub Group:  Cyclooxygenases	Protein:  Ram Prostaglandin H2 synthase-1 (cyclooxygenase-1 or COX-1)
Find proteins for P05979 (Ovis aries) Go to Gene View: PTGS1 Go to UniProtKB:  P05979

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
SCL	A	ACETIC ACID SALICYLOYL-AMINO-ESTER C9 H9 N O4 PCFWLDHLJWUGSU-UHFFFAOYSA-N
HEM	A	PROTOPORPHYRIN IX CONTAINING FE HEME C34 H32 Fe N4 O4 KABFMIBPWCXCRK-RGGAHWMASA-L
NAG	A	N-ACETYL-D-GLUCOSAMINE C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
OAS	A	L-PEPTIDE LINKING	C5 H9 N O4		SER

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.2 Å
• R-Value Free: 0.248 
• R-Value Work: 0.218 
• Space Group: I 2 2 2

Unit Cell:

Length (Å)	Angle (°)
a = 98.870	α = 90.00
b = 207.460	β = 90.00
c = 221.980	γ = 90.00

Software Package:

Software Name	Purpose
MAR345	data collection
SCALEPACK	data scaling
X-PLOR	phasing
X-PLOR	model building
CNS	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2000-01-24 
• Released Date: 2000-02-24 
• Deposition Author(s): Loll, P.J., Sharkey, C.T., O'Connor, S.J., Fitzgerald, D.J.

Revision History 

• Version 1.0: 2000-02-24
  Type: Initial release
• Version 1.1: 2008-04-27
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Non-polymer description, Version format compliance
• Version 1.3: 2017-10-04
  Type: Refinement description