3KV8

Structural basis of the activity and substrate specificity of the fluoroacetyl-CoA thioesterase FlK - Wild type FlK in complex with fluoro-acetate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.172 

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:  
    3KUV, 3KV7, 3KUW, 3KV8, 3KVZ, 3KW1, 3KVU, 3KVI, 3KX8, 3KX7

  • 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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Fluoroacetyl-CoA thioesterase FlKA, B139Streptomyces cattleyaMutation(s): 0 
Gene Names: flKfluoroacetyl-CoA thioesterase FlK
EC: 3 (PDB Primary Data), 3.1.2.29 (UniProt)
Find proteins for Q1EMV2 (Streptomyces cattleya)
Explore Q1EMV2 
Go to UniProtKB:  Q1EMV2
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FAH
Query on FAH

Download CCD File 
A, B
fluoroacetic acid
C2 H3 F O2
QEWYKACRFQMRMB-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.172 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 62.43α = 90
b = 92.99β = 101.58
c = 50.09γ = 90
Software Package:
Software NamePurpose
MAR345dtbdata collection
AMoREphasing
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

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