2WUA

Structure of the peroxisomal 3-ketoacyl-CoA thiolase from Sunflower


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.186 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Peroxisomal Plant 3-Ketoacyl-Coa Thiolases Structure and Activity are Regulated by a Sensitive Redox Switch

Pye, V.E.Christensen, C.E.Dyer, J.H.Arent, S.Henriksen, A.

(2010) J.Biol.Chem. 285: 24078

  • DOI: 10.1074/jbc.M110.106013
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The breakdown of fatty acids, performed by the beta-oxidation cycle, is crucial for plant germination and sustainability. beta-Oxidation involves four enzymatic reactions. The final step, in which a two-carbon unit is cleaved from the fatty acid, is ...

    The breakdown of fatty acids, performed by the beta-oxidation cycle, is crucial for plant germination and sustainability. beta-Oxidation involves four enzymatic reactions. The final step, in which a two-carbon unit is cleaved from the fatty acid, is performed by a 3-ketoacyl-CoA thiolase (KAT). The shortened fatty acid may then pass through the cycle again (until reaching acetoacetyl-CoA) or be directed to a different cellular function. Crystal structures of KAT from Arabidopsis thaliana and Helianthus annuus have been solved to 1.5 and 1.8 A resolution, respectively. Their dimeric structures are very similar and exhibit a typical thiolase-like fold; dimer formation and active site conformation appear in an open, active, reduced state. Using an interdisciplinary approach, we confirmed the potential of plant KATs to be regulated by the redox environment in the peroxisome within a physiological range. In addition, co-immunoprecipitation studies suggest an interaction between KAT and the multifunctional protein that is responsible for the preceding two steps in beta-oxidation, which would allow a route for substrate channeling. We suggest a model for this complex based on the bacterial system.


    Organizational Affiliation

    Protein Chemistry Group, Carlsberg Laboratory, Gamle Carlsberg Vej 10, DK-2500 Valby, Denmark. vpye@tcd.ie




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ACETOACETYL COA THIOLASE
A, B
440Helianthus annuusMutation(s): 1 
EC: 2.3.1.16
Find proteins for Q6W6X6 (Helianthus annuus)
Go to UniProtKB:  Q6W6X6
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.186 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 78.596α = 90.00
b = 100.692β = 90.00
c = 105.296γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
PHASERphasing
MOSFLMdata reduction
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-05-12
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-12-20
    Type: Structure summary
  • Version 1.4: 2019-05-08
    Type: Data collection, Experimental preparation