Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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

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

Macromolecule Content

• Total Structure Weight: 72.27 kDa 
• Atom Count: 4605 
• Residue Count: 553 
• Unique protein chains: 1

2OYE

Indomethacin-(R)-alpha-ethyl-ethanolamide bound to Cyclooxygenase-1

• DOI: 10.2210/pdb2OYE/pdb

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


• Deposited: 2007-02-21 Released: 2007-07-24 
• Deposition Author(s): Harman, C.A., Garavito, R.M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.85 Å
• R-Value Free: 0.292 
• R-Value Work: 0.245 

Literature

Structural basis of enantioselective inhibition of cyclooxygenase-1 by S-alpha-substituted indomethacin ethanolamides.

Harman, C.A., Turman, M.V., Kozak, K.R., Marnett, L.J., Smith, W.L., Garavito, R.M.

(2007) J Biol Chem 282: 28096-28105

• PubMed: 17656360 
• DOI: 10.1074/jbc.M701335200
• Primary Citation of Related Structures:  
  2OYU, 2OYE


• PubMed Abstract: 
  

The modification of the nonselective nonsteroidal anti-inflammatory drug, indomethacin, by amidation presents a promising strategy for designing novel cyclooxygenase (COX)-2-selective inhibitors. A series of alpha-substituted indomethacin ethanolamides, which exist as R/S-enantiomeric pairs, provides a means to study the impact of stereochemistry on COX inhibition. Comparative studies revealed that the R- and S-enantiomers of the alpha-substituted analogs inhibit COX-2 with almost equal efficacy, whereas COX-1 is selectively inhibited by the S-enantiomers. Mutagenesis studies have not been able to identify residues that manifest the enantioselectivity in COX-1. In an effort to understand the structural impact of chirality on COX-1 selectivity, the crystal structures of ovine COX-1 in complexes with an enantiomeric pair of these indomethacin ethanolamides were determined at resolutions between 2.75 and 2.85 A. These structures reveal unique, enantiomer-selective interactions within the COX-1 side pocket region that stabilize drug binding and account for the chiral selectivity observed with the (S)-alpha-substituted indomethacin ethanolamides. Kinetic analysis of binding demonstrates that both inhibitors bind quickly utilizing a two-step mechanism. However, the second binding step is readily reversible for the R-enantiomer, whereas for the S-enantiomer, it is not. These studies establish for the first time the structural and kinetic basis of high affinity binding of a neutral inhibitor to COX-1 and demonstrate that the side pocket of COX-1, previously thought to be sterically inaccessible, can serve as a binding pocket for inhibitor association.

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Organizational Affiliation: 

Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, Michigan 48824, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Prostaglandin G/H synthase 1	P	600	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-alpha-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose	A	2		N-Glycosylation

Entity ID: 3
Molecule	Chains	Chain Length	2D Diagram	Glycosylation
beta-D-mannopyranose-(1-6)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose	B	4		N-Glycosylation

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

Small Molecules

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
HEM	P	PROTOPORPHYRIN IX CONTAINING FE C34 H32 Fe N4 O4 KABFMIBPWCXCRK-RGGAHWMASA-L
IM8	P	2-[1-(4-CHLOROBENZOYL)-5-METHOXY-2-METHYL-1H-INDOL-3-YL]-N-[(1R)-1-(HYDROXYMETHYL)PROPYL]ACETAMIDE C23 H25 Cl N2 O4 GKJWXEORYGBJFS-QGZVFWFLSA-N
BOG	P	octyl beta-D-glucopyranoside C14 H28 O6 HEGSGKPQLMEBJL-RKQHYHRCSA-N
FLC	P	CITRATE ANION C6 H5 O7 KRKNYBCHXYNGOX-UHFFFAOYSA-K

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
IM8	IC50:  59000   nM  BindingDB
IMS	IC50:  350   nM  BindingDB

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.85 Å
• R-Value Free: 0.292 
• R-Value Work: 0.245 
• Space Group: P 6₅ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 181.72	α = 90
b = 181.72	β = 90
c = 104.09	γ = 120

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
CNS	refinement
PDB_EXTRACT	data extraction
MAR345	data collection
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2007-02-21 
• Released Date: 2007-07-24 
Deposition Author(s): Harman, C.A., Garavito, R.M.

Revision History 

• Version 1.0: 2007-07-24
  Type: Initial release
  
• Version 1.1: 2007-10-03
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Derived calculations, Version format compliance
• Version 1.3: 2017-10-18
  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