1PTH

The Structural Basis of Aspirin Activity Inferred from the Crystal Structure of Inactivated Prostaglandin H2 Synthase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.4 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.186 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The structural basis of aspirin activity inferred from the crystal structure of inactivated prostaglandin H2 synthase.

Loll, P.J.Picot, D.Garavito, R.M.

(1995) Nat.Struct.Mol.Biol. 2: 637-643


  • PubMed Abstract: 
  • Aspirin exerts its anti-inflammatory effects through selective acetylation of serine 530 on prostaglandin H2 synthase (PGHS). Here we present the 3.4 A resolution X-ray crystal structure of PGHS isoform-1 inactivated by the potent aspirin analogue 2- ...

    Aspirin exerts its anti-inflammatory effects through selective acetylation of serine 530 on prostaglandin H2 synthase (PGHS). Here we present the 3.4 A resolution X-ray crystal structure of PGHS isoform-1 inactivated by the potent aspirin analogue 2-bromoacetoxy-benzoic acid. Acetylation by this analogue abolishes cyclooxygenase activity by steric blockage of the active-site channel and not through a large conformational change. We observe two rotameric states of the acetyl-serine side chain which block the channel to different extents, a result which may explain the dissimilar effects of aspirin on the two PGHS isoforms. We also observe the product salicylic acid binding at a site consistent with its antagonistic effect on aspirin activity.


    Related Citations: 
    • The X-Ray Crystal Structure of the Membrane Protein Prostaglandin H2 Synthase-1
      Picot, D.,Loll, P.J.,Garavito, R.M.
      (1994) Nature 367: 243


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, University of Chicago, Illinois 60637, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROSTAGLANDIN H2 SYNTHASE-1
A, B
576Ovis ariesMutation(s): 0 
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 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEM
Query on HEM

Download SDF File 
Download CCD File 
A, B
PROTOPORPHYRIN IX CONTAINING FE
HEME
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
SAL
Query on SAL

Download SDF File 
Download CCD File 
A, B
2-HYDROXYBENZOIC ACID
SALICYLIC ACID
C7 H6 O3
YGSDEFSMJLZEOE-UHFFFAOYSA-N
 Ligand Interaction
NAG
Query on NAG

Download SDF File 
Download CCD File 
A, B
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
BOG
Query on BOG

Download SDF File 
Download CCD File 
A, B
B-OCTYLGLUCOSIDE
C14 H28 O6
HEGSGKPQLMEBJL-RKQHYHRCSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
0AH
Query on 0AH
A, B
L-PEPTIDE LINKINGC5 H8 Br N O4SER
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
SALKi: >10000 nM (92) BINDINGDB
SALIC50: 500000 nM (92) BINDINGDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.4 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.186 
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 99.570α = 90.00
b = 209.800β = 90.00
c = 235.000γ = 90.00
Software Package:
Software NamePurpose
X-PLORphasing
MADNESdata collection
X-PLORmodel building
X-PLORrefinement
MADNESdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1996-04-11
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Non-polymer description, Version format compliance