3KUV

Structural basis of the activity and substrate specificity of the fluoroacetyl-CoA thioesterase FlK - T42S mutant in complex with acetate.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.181 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural basis for the activity and substrate specificity of fluoroacetyl-CoA thioesterase FlK.

Dias, M.V.Huang, F.Chirgadze, D.Y.Tosin, M.Spiteller, D.Dry, E.F.Leadlay, P.F.Spencer, J.B.Blundell, T.L.

(2010) J.Biol.Chem. 285: 22495-22504

  • DOI: 10.1074/jbc.M110.107177
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The thioesterase FlK from the fluoroacetate-producing Streptomyces cattleya catalyzes the hydrolysis of fluoroacetyl-coenzyme A. This provides an effective self-defense mechanism, preventing any fluoroacetyl-coenzyme A formed from being further metab ...

    The thioesterase FlK from the fluoroacetate-producing Streptomyces cattleya catalyzes the hydrolysis of fluoroacetyl-coenzyme A. This provides an effective self-defense mechanism, preventing any fluoroacetyl-coenzyme A formed from being further metabolized to 4-hydroxy-trans-aconitate, a lethal inhibitor of the tricarboxylic acid cycle. Remarkably, FlK does not accept acetyl-coenzyme A as a substrate. Crystal structure analysis shows that FlK forms a dimer, in which each subunit adopts a hot dog fold as observed for type II thioesterases. Unlike other type II thioesterases, which invariably utilize either an aspartate or a glutamate as catalytic base, we show by site-directed mutagenesis and crystallography that FlK employs a catalytic triad composed of Thr(42), His(76), and a water molecule, analogous to the Ser/Cys-His-acid triad of type I thioesterases. Structural comparison of FlK complexed with various substrate analogues suggests that the interaction between the fluorine of the substrate and the side chain of Arg(120) located opposite to the catalytic triad is essential for correct coordination of the substrate at the active site and therefore accounts for the substrate specificity.


    Organizational Affiliation

    Department of Biochemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Fluoroacetyl coenzyme A thioesterase
A, B
139Streptomyces cattleyaMutation(s): 1 
Gene Names: flK
EC: 3.1.2.29
Find proteins for Q1EMV2 (Streptomyces cattleya)
Go to UniProtKB:  Q1EMV2
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ACT
Query on ACT

Download SDF File 
Download CCD File 
A, B
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.181 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 62.296α = 90.00
b = 92.678β = 100.61
c = 49.109γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
CrystalCleardata collection
REFMACrefinement
SCALAdata scaling
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-04-21
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2018-01-24
    Type: Structure summary