9EM4

OPR3 variant Y364P in its dimeric form obtained with ammonium sulfate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.01 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.208 

Starting Model: experimental
View more details

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history


Literature

Analysis of homodimer formation in 12-oxophytodienoate reductase 3 in solutio and crystallo challenges the physiological role of the dimer.

Kerschbaumer, B.Macheroux, P.Bijelic, A.

(2024) Sci Rep 14: 18093-18093

  • DOI: https://doi.org/10.1038/s41598-024-69160-6
  • Primary Citation of Related Structures:  
    8QN1, 8QN9, 8S8V, 8S8Y, 9EM0, 9EM2, 9EM3, 9EM4, 9EM5, 9EM6

  • PubMed Abstract: 

    12-oxophytodienoate reductase 3 (OPR3) is a key enzyme in the biosynthesis of jasmonoyl-L-isoleucine, the receptor-active form of jasmonic acid and crucial signaling molecule in plant defense. OPR3 was initially crystallized as a self-inhibitory dimer, implying that homodimerization regulates enzymatic activity in response to biotic and abiotic stresses. Since a sulfate ion is bound to Y364, mimicking a phosphorylated tyrosine, it was suggested that dimer formation might be controlled by reversible phosphorylation of Y364 in vivo. To investigate OPR3 homodimerization and its potential physiological role in more detail, we performed analytical gel filtration and dynamic light scattering on wild-type OPR3 and three variants (R283D, R283E, and Y364P). The experiments revealed a rapid and highly sensitive monomer-dimer equilibrium for all OPR3 constructs. We crystallized all constructs with and without sulfate to examine its effect on the dimerization process and whether reversible phosphorylation of Y364 triggers homodimerization in vivo. All OPR3 constructs crystallized in their monomeric and dimeric forms independent of the presence of sulfate. Even variant Y364P, lacking the putative phosphorylation site, was crystallized as a self-inhibitory homodimer, indicating that Y364 is not required for dimerization. Generally, the homodimer is relatively weak, and our results raise doubts about its physiological role in regulating jasmonate biosynthesis.


  • Organizational Affiliation

    Institute of Biochemistry, Graz University of Technology, Petersgasse 12/II, 8010, Graz, Austria.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
12-oxophytodienoate reductase 3A [auth B],
B [auth A]
402Solanum lycopersicumMutation(s): 1 
Gene Names: OPR3
EC: 1.3.1.42
UniProt
Find proteins for Q9FEW9 (Solanum lycopersicum)
Explore Q9FEW9 
Go to UniProtKB:  Q9FEW9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9FEW9
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.01 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.208 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.531α = 90
b = 89.64β = 109.01
c = 80.943γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Austrian Science FundAustria--

Revision History  (Full details and data files)

  • Version 1.0: 2024-08-14
    Type: Initial release
  • Version 1.1: 2024-08-21
    Changes: Database references