2C7Y

plant enzyme


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.201 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

The Crystal Structure of a Plant 3-Ketoacyl-Coa Thiolase Reveals the Potential for Redox Control of Peroxisomal Fatty Acid Beta-Oxidation.

Sundaramoorthy, R.Micossi, E.Alphey, M.S.Germain, V.Bryce, J.H.Smith, S.M.Leonard, G.A.Hunter, W.N.

(2006) J.Mol.Biol. 359: 347

  • DOI: 10.1016/j.jmb.2006.03.032
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Crystal structures of peroxisomal Arabidopsis thaliana 3-ketoacyl-CoA thiolase (AtKAT), an enzyme of fatty acid beta-oxidation, are reported. The subunit, a typical thiolase, is a combination of two similar alpha/beta domains capped with a loop domai ...

    Crystal structures of peroxisomal Arabidopsis thaliana 3-ketoacyl-CoA thiolase (AtKAT), an enzyme of fatty acid beta-oxidation, are reported. The subunit, a typical thiolase, is a combination of two similar alpha/beta domains capped with a loop domain. The comparison of AtKAT with the Saccharomyces cerevisiae homologue (ScKAT) structure reveals a different placement of subunits within the functional dimers and that a polypeptide segment forming an extended loop around the open catalytic pocket of ScKAT converts to alpha-helix in AtKAT, and occludes the active site. A disulfide is formed between Cys192, on this helix, and Cys138, a catalytic residue. Access to Cys138 is determined by the structure of this polypeptide segment. AtKAT represents an oxidized, previously unknown inactive form, whilst ScKAT is the reduced and active enzyme. A high level of sequence conservation is observed, including Cys192, in eukaryotic peroxisomal, but not mitochondrial or prokaryotic KAT sequences, for this labile loop/helix segment. This indicates that KAT activity in peroxisomes is influenced by a disulfide/dithiol change linking fatty acid beta-oxidation with redox regulation.


    Organizational Affiliation

    Division of Biological Chemistry and Molecular Microbiology, School of Life Sciences, University of Dundee, Dundee DD1 5EH, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
3-KETOACYL-COA THIOLASE 2
A, B
404Arabidopsis thalianaMutation(s): 0 
Gene Names: PED1 (KAT2)
EC: 2.3.1.16
Find proteins for Q56WD9 (Arabidopsis thaliana)
Go to UniProtKB:  Q56WD9
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.201 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 73.154α = 90.00
b = 94.461β = 90.00
c = 111.499γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
MOLREPphasing
SCALEPACKdata scaling
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-05-18
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance