Crystal structure of peroxisomal KAT2 from Arabidopsis thaliana

Experimental Data Snapshot

  • Resolution: 1.50 Å
  • R-Value Free: 0.178 
  • R-Value Work: 0.150 
  • R-Value Observed: 0.151 

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This is version 1.4 of the entry. See complete history


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: https://doi.org/10.1074/jbc.M110.106013
  • Primary Citation of Related Structures:  
    2WU9, 2WUA

  • 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 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

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
442Arabidopsis thalianaMutation(s): 0 
Gene Names: PED1KAT2At2g33150F25I18.11
Find proteins for Q56WD9 (Arabidopsis thaliana)
Explore Q56WD9 
Go to UniProtKB:  Q56WD9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ56WD9
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.50 Å
  • R-Value Free: 0.178 
  • R-Value Work: 0.150 
  • R-Value Observed: 0.151 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 60.831α = 90
b = 86.67β = 106.71
c = 72.75γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-05-12
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2019-05-08
    Changes: Data collection, Experimental preparation, Other
  • Version 1.4: 2019-07-24
    Changes: Data collection