3N8X

Crystal Structure of Cyclooxygenase-1 in Complex with Nimesulide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.181 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Comparison of Cyclooxygenase-1 Crystal Structures: Cross-Talk between Monomers Comprising Cyclooxygenase-1 Homodimers

Sidhu, R.S.Lee, J.Y.Yuan, C.Smith, W.L.

(2010) Biochemistry 49: 7069-7079

  • DOI: 10.1021/bi1003298
  • Primary Citation of Related Structures:  3N8V, 3N8W, 3N8Y, 3N8Z

  • PubMed Abstract: 
  • Prostaglandin endoperoxide H synthases (PGHSs)-1 and -2 (also called cyclooxygenases (COXs)-1 and -2) catalyze the committed step in prostaglandin biosynthesis. Both isoforms are targets of nonsteroidal antiinflammatory drugs (NSAIDs). PGHSs are homo ...

    Prostaglandin endoperoxide H synthases (PGHSs)-1 and -2 (also called cyclooxygenases (COXs)-1 and -2) catalyze the committed step in prostaglandin biosynthesis. Both isoforms are targets of nonsteroidal antiinflammatory drugs (NSAIDs). PGHSs are homodimers that exhibit half-of-sites COX activity; moreover, some NSAIDs cause enzyme inhibition by binding only one monomer. To learn more about the cross-talk that must be occurring between the monomers comprising each PGHS-1 dimer, we analyzed structures of PGHS-1 crystallized under five different conditions including in the absence of any tightly binding ligand and in the presence of nonspecific NSAIDs and of a COX-2 inhibitor. When crystallized with substoichiometric amounts of an NSAID, both monomers are often fully occupied with inhibitor; thus, the enzyme prefers to crystallize in a fully occupied form. In comparing the five structures, we only observe changes in the positions of residues 123-129 and residues 510-515. In cases where one monomer is fully occupied with an NSAID and the partner monomer is incompletely occupied, an alternate conformation of the loop involving residues 123-129 is seen in the partially occupied monomer. We propose, on the basis of this observation and previous cross-linking studies, that cross-talk between monomers involves this mobile 123-129 loop, which is located at the dimer interface. In ovine PGHS-1 crystallized in the absence of an NSAID, there is an alternative route for substrate entry into the COX site different than the well-known route through the membrane binding domain.


    Organizational Affiliation

    Department of Biological Chemistry, University of Michigan, Ann Arbor, Michigan 48109, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Prostaglandin G/H synthase 1
A, B
553Ovis ariesGene 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 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NIM
Query on NIM

Download SDF File 
Download CCD File 
A, B
4-NITRO-2-PHENOXYMETHANESULFONANILIDE
NIMESULIDE
C13 H12 N2 O5 S
HYWYRSMBCFDLJT-UHFFFAOYSA-N
 Ligand Interaction
BMA
Query on BMA

Download SDF File 
Download CCD File 
A
BETA-D-MANNOSE
C6 H12 O6
WQZGKKKJIJFFOK-RWOPYEJCSA-N
 Ligand Interaction
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
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 
B
B-OCTYLGLUCOSIDE
C14 H28 O6
HEGSGKPQLMEBJL-RKQHYHRCSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
NIMIC50: 3760 - >100000 nM (93) BINDINGDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.181 
  • Space Group: P 65
Unit Cell:
Length (Å)Angle (°)
a = 181.709α = 90.00
b = 181.709β = 90.00
c = 103.454γ = 120.00
Software Package:
Software NamePurpose
PHASERphasing
HKL-2000data collection
HKL-2000data reduction
REFMACrefinement
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2010-05-28 
  • Released Date: 2010-07-28 
  • Deposition Author(s): Lee, J.Y.

Revision History 

  • Version 1.0: 2010-07-28
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance