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: 138.09 kDa 
• Atom Count: 9168 
• Modelled Residue Count: 1104 
• Deposited Residue Count: 1174 
• Unique protein chains: 1

6COX

CYCLOOXYGENASE-2 (PROSTAGLANDIN SYNTHASE-2) COMPLEXED WITH A SELECTIVE INHIBITOR, SC-558 IN I222 SPACE GROUP

• DOI: 10.2210/pdb6COX/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Mus musculus
• Expression System: Spodoptera frugiperda
• Mutation(s): No 


• Deposited: 1996-12-18 Released: 1997-12-24 
• Deposition Author(s): Kurumbail, R., Stallings, W.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free: 0.309 
• R-Value Work: 0.220 
• R-Value Observed: 0.220 

Literature

Structural basis for selective inhibition of cyclooxygenase-2 by anti-inflammatory agents.

Kurumbail, R.G., Stevens, A.M., Gierse, J.K., McDonald, J.J., Stegeman, R.A., Pak, J.Y., Gildehaus, D., Miyashiro, J.M., Penning, T.D., Seibert, K., Isakson, P.C., Stallings, W.C.

(1996) Nature 384: 644-648

• PubMed: 8967954 
• DOI: 10.1038/384644a0
• Primary Citation of Related Structures:  
  1CX2, 4COX, 3PGH, 5COX, 6COX


• PubMed Abstract: 
  

Prostaglandins and glucocorticoids are potent mediators of inflammation. Non-steroidal anti-inflammatory drugs (NSAIDs) exert their effects by inhibition of prostaglandin production. The pharmacological target of NSAIDs is cyclooxygenase (COX, also known as PGH synthase), which catalyses the first committed step in arachidonic-acid metabolism. Two isoforms of the membrane protein COX are known: COX-1, which is constitutively expressed in most tissues, is responsible for the physiological production of prostaglandins; and COX-2, which is induced by cytokines, mitogens and endotoxins in inflammatory cells, is responsible for the elevated production of prostaglandins during inflammation. The structure of ovine COX-1 complexed with several NSAIDs has been determined. Here we report the structures of unliganded murine COX-2 and complexes with flurbiprofen, indomethacin and SC-558, a selective COX-2 inhibitor, determined at 3.0 to 2.5 A resolution. These structures explain the structural basis for the selective inhibition of COX-2, and demonstrate some of the conformational changes associated with time-dependent inhibition.

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Related Citations: 

• Erratum. Structural Basis for Selective Inhibition of Cyclooxygenase-2 by Anti-Inflammatory Agents
  Kurumbail, R.G., Stevens, A.M., Gierse, J.K., Mcdonald, J.J., Stegeman, R.A., Pak, J.Y., Gildehaus, D., Miyashiro, J.M., Penning, T.D., Seibert, K., Isakson, P.C., Stallings, W.C.
  (1997) Nature 385: 555

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Organizational Affiliation: 

G.D. Searle, St Louis, Missouri 63198, USA. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CYCLOOXYGENASE-2	A, B	587	Mus musculus	Mutation(s): 0  Gene Names: Ptgs2, Cox-2, Cox2, Pghs-b, Tis10 EC: 1.14.99.1
UniProt
Find proteins for Q05769 (Mus musculus) Explore Q05769  Go to UniProtKB:  Q05769

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
HEM	F [auth A], K [auth B]	PROTOPORPHYRIN IX CONTAINING FE C34 H32 Fe N4 O4 KABFMIBPWCXCRK-RGGAHWMASA-L
S58	G [auth A], L [auth B]	1-PHENYLSULFONAMIDE-3-TRIFLUOROMETHYL-5-PARABROMOPHENYLPYRAZOLE C16 H11 Br F3 N3 O2 S OYZKFVIVPRQRQQ-UHFFFAOYSA-N
NAG	C [auth A], D [auth A], E [auth A], H [auth B], I [auth B], J [auth B]	2-acetamido-2-deoxy-beta-D-glucopyranose C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
S58	IC50:  50   nM  BindingDB

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free: 0.309 
• R-Value Work: 0.220 
• R-Value Observed: 0.220 
• Space Group: I 2 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 181.17	α = 90
b = 132.81	β = 90
c = 122.74	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
MERLOT	phasing
X-PLOR	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1996-12-18 
• Released Date: 1997-12-24 
Deposition Author(s): Kurumbail, R., Stallings, W.

Revision History  

• Version 1.0: 1997-12-24
  Type: Initial release
  
• Version 1.1: 2008-03-03
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Non-polymer description, Version format compliance
• Version 1.3: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Data collection, Database references, Derived calculations, Structure summary