Biological Assembly 1  

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Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 139028.48 
• Atom Count: 9283 
• Residue Count: 1160 
• Unique protein chains: 1

1CQE

PROSTAGLANDIN H2 SYNTHASE-1 COMPLEX WITH FLURBIPROFEN

• DOI: 10.2210/pdb1CQE/pdb

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


• Deposited: 1999-06-15 Released: 1999-06-30 
• Deposition Author(s): Picot, D., Loll, P.J., Mulichak, A.M., Garavito, R.M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.1 Å
• R-Value Free: 0.226 
• R-Value Work: 0.186 

Literature

The X-ray crystal structure of the membrane protein prostaglandin H2 synthase-1.

Picot, D., Loll, P.J., Garavito, R.M.

(1994) Nature 367: 243-249

• PubMed: 8121489 
• DOI: 10.1038/367243a0
• Primary Citation of Related Structures:  
  1PRH


• PubMed Abstract: 
  

The three-dimensional structure of prostaglandin H2 synthase-1, an integral membrane protein, has been determined at 3.5 A resolution by X-ray crystallography. This bifunctional enzyme comprises three independent folding units: an epidermal growth factor domain, a membrane-binding motif and an enzymatic domain. Two adjacent but spatially distinct active sites were found for its haem-dependent peroxidase and cyclooxygenase activities. The cyclooxygenase active site is created by a long, hydrophobic channel that is the site of non-steroidal anti-inflammatory drug binding. The conformation of the membrane-binding motif strongly suggests that the enzyme integrates into only one leaflet of the lipid bilayer and is thus a monotopic membrane protein.

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Related Citations: 

• X-Ray Crystal Structure of Canine Myeloperoxidase at 3 Angstroms Resolution
  Zeng, J.,Fenna, R.E.
  (1992) J.Mol.Biol. 226: 185
• 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
• Synthesis and Use of Iodinated Nonsteroidal Antiinflammatory Drug Analogs as Crystallographic Probes of the Prostaglandin H2 Synthase Cyclooxygenase Active Site
  Loll, P.J.,Picot, D.,Ekabo, O.,Garavito, R.M.
  (1996) Biochemistry 35: 7330




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Organizational Affiliation: 

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

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
PROTEIN (PROSTAGLANDIN H2 SYNTHASE-1)	A, B	580	Ovis aries	Mutation(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
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
HEM	A, B	PROTOPORPHYRIN IX CONTAINING FE HEME C34 H32 Fe N4 O4 KABFMIBPWCXCRK-RGGAHWMASA-L
NAG	A, B	N-ACETYL-D-GLUCOSAMINE C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N
BOG	A, B	B-OCTYLGLUCOSIDE C14 H28 O6 HEGSGKPQLMEBJL-RKQHYHRCSA-N
FLP	A, B	FLURBIPROFEN C15 H13 F O2 SYTBZMRGLBWNTM-JTQLQIEISA-N

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
FLP	Ki: 75 - 1000 nM (92) BINDINGDB
FLP	IC50: 10 - 2000 nM (92) BINDINGDB

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.1 Å
• R-Value Free: 0.226 
• R-Value Work: 0.186 
• Space Group: I 2 2 2

Unit Cell:

Length (Å)	Angle (°)
a = 99.400	α = 90.00
b = 210.300	β = 90.00
c = 233.100	γ = 90.00

Software Package:

Software Name	Purpose
X-PLOR	refinement
MADNESS	data collection
CCP4	data reduction
PROCOR	data reduction
MADNESS	data reduction
CCP4	data scaling
MLPHARE	phasing
CCP4	model building
CCP4	phasing
PROCOR	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1999-06-15 
• Released Date: 1999-06-30 
• Deposition Author(s): Picot, D., Loll, P.J., Mulichak, A.M., Garavito, R.M.

Revision History 

• Version 1.0: 1999-06-30
  Type: Initial release
• Version 1.1: 2008-04-26
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Non-polymer description, Version format compliance
• Version 1.3: 2017-10-04
  Type: Advisory, Refinement description