Biological Assembly 1  

 3D View: Structure | Ligand Interaction

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: 138.92 kDa 
• Atom Count: 9413 
• Residue Count: 1105 
• Unique protein chains: 1

1CQE

PROSTAGLANDIN H2 SYNTHASE-1 COMPLEX WITH FLURBIPROFEN

• DOI: 10.2210/pdb1CQE/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Ovis aries
• Mutation(s): No 


• 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: 3.10 Å
• R-Value Free: 0.226 
• R-Value Work: 0.186 
• R-Value Observed: 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:  
  1CQE, 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: 

• 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

• 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 Biol 2: 637

• X-Ray Crystal Structure of Canine Myeloperoxidase at 3 Angstroms Resolution
  Zeng, J., Fenna, R.E.
  (1992) J Mol Biol 226: 185

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Organizational Affiliation: 

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

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTEIN (PROSTAGLANDIN H2 SYNTHASE-1)	A, B	580	Ovis aries	Mutation(s): 0  Gene Names: PTGS1, COX1 EC: 1.14.99.1
Find proteins for P05979 (Ovis aries) Explore P05979  Go to UniProtKB:  P05979

Oligosaccharides

Help

Entity ID: 2
Molecule	Chains	Chain Length	2D Diagram	Glycosylation
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose	C, D, E, F, G, H	2		N-Glycosylation

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
HEM	A, B	PROTOPORPHYRIN IX CONTAINING FE C34 H32 Fe N4 O4 KABFMIBPWCXCRK-RGGAHWMASA-L
BOG	A, B	octyl beta-D-glucopyranoside 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   nM  BindingDB
FLP	Ki:  1000   nM  BindingDB
FLP	IC50:  12   nM  BindingDB
FLP	IC50:  30   nM  BindingDB
FLP	IC50:  2000   nM  BindingDB
FLP	IC50:  150   nM  BindingDB
FLP	IC50:  11   nM  BindingDB
FLP	IC50:  1995   nM  BindingDB
FLP	IC50:  10   nM  BindingDB
FLP	Ki:  410   nM  BindingDB
FLP	IC50:  500   nM  BindingDB
FLP	IC50:  170   nM  BindingDB

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.10 Å
• R-Value Free: 0.226 
• R-Value Work: 0.186 
• R-Value Observed: 0.186 
• Space Group: I 2 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 99.4	α = 90
b = 210.3	β = 90
c = 233.1	γ = 90

Software Package:

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

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
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Non-polymer description, Version format compliance
• Version 1.3: 2017-10-04
  Changes: Advisory, Refinement description
• Version 2.0: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Advisory, Atomic model, Data collection, Derived calculations, Structure summary