Crystal Structure of Arachidonic Acid Bound to a Mutant of Prostagladin H Synthase-1 that Forms Predominantly 11-HPETE.

Experimental Data Snapshot

  • Resolution: 3.10 Å
  • R-Value Free: 0.311 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.227 

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Crystal structure of arachidonic Acid bound to a mutant of prostaglandin endoperoxide h synthase-1 that forms predominantly 11-hydroperoxyeicosatetraenoic Acid.

Harman, C.A.Rieke, C.J.Garavito, R.M.Smith, W.L.

(2004) J Biol Chem 279: 42929-42935

  • DOI: https://doi.org/10.1074/jbc.M403013200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Kinetic studies and analysis of the products formed by native and mutant forms of ovine prostaglandin endoperoxide H synthase-1 (oPGHS-1) have suggested that arachidonic acid (AA) can exist in the cyclooxygenase active site of the enzyme in three different, catalytically competent conformations that lead to prostaglandin G2 (PGG2), 11R-hydroperoxyeicosatetraenoic acid (HPETE), and 15R,S-HPETE, respectively. We have identified an oPGHS-1 mutant (V349A/W387F) that forms predominantly 11R-HPETE. Thus, the preferred catalytically competent arrangement of AA in the cyclooxygenase site of this double mutant must be one that leads to 11-HPETE. The crystal structure of Co3+-protoporphyrin IX V349A/W387F oPGHS-1 in a complex with AA was determined to 3.1 A. Significant differences are observed in the positions of atoms C-3, C-4, C-5, C-6, C-10, C-11, and C-12 of bound AA between native and V349A/W387F oPGHS-1; in comparison, the positions of the side chains of cyclooxygenase active site residues are unchanged. The structure of the double mutant presented here provides structural insight as to how Val349 and Trp387 help position C-9 and C-11 of AA so that the incipient 11-peroxyl radical intermediate is able to add to C-9 to form the 9,11 endoperoxide group of PGG2. In the V349A/W387F oPGHS-1.AA complex the locations of C-9 and C-11 of AA with respect to one another make it difficult to form the endoperoxide group from the 11-hydroperoxyl radical. Therefore, the reaction apparently aborts yielding 11R-HPETE instead of PGG2. In addition, the observed differences in the positions of carbon atoms of AA bound to this mutant provides indirect support for the concept that the conformer of AA shown previously to be bound within the cyclooxygenase active site of native oPGHS-1 is the one that leads to PGG2.

  • Organizational Affiliation

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

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Prostaglandin G/H synthase 1 precursor600Ovis ariesMutation(s): 2 
Gene Names: PTGS1COX1
Find proteins for P05979 (Ovis aries)
Explore P05979 
Go to UniProtKB:  P05979
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP05979
Sequence Annotations
  • Reference Sequence


Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
B, D
Glycosylation Resources
GlyTouCan:  G07375KG
GlyCosmos:  G07375KG
GlyGen:  G07375KG
Entity ID: 3
MoleculeChains Length2D Diagram Glycosylation3D Interactions
Glycosylation Resources
GlyTouCan:  G40894EI
GlyCosmos:  G40894EI
GlyGen:  G40894EI
Experimental Data & Validation

Experimental Data

  • Resolution: 3.10 Å
  • R-Value Free: 0.311 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.227 
  • Space Group: P 65 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 181.879α = 90
b = 181.879β = 90
c = 103.368γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
SCALEPACKdata scaling
HKL-2000data reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-09-07
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Structure summary
  • Version 2.1: 2021-10-20
    Changes: Database references, Structure summary
  • Version 2.2: 2023-08-23
    Changes: Data collection, Refinement description