2GYO

Methanethiol-Cys 112 Inhibition Complex of E. Coli Ketoacyl Synthase III (FabH) and Coenzyme A

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.207 
  • R-Value Observed: 0.213 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history. 


Literature

Alkyl-CoA Disulfides as Inhibitors and Mechanistic Probes for FabH Enzymes.

Alhamadsheh, M.M., Musayev, F., Komissarov, A.A., Sachdeva, S., Wright, H.T., Scarsdale, N., Florova, G., Reynolds, K.A.

(2007) Chem Biol 14: 513-524

  • DOI: 10.1016/j.chembiol.2007.03.013
  • Primary Citation of Related Structures:  
    2EFT, 2GYO

  • PubMed Abstract: 

    • The first step of the reaction catalyzed by the homodimeric FabH from a dissociated fatty acid synthase is acyl transfer from acyl-CoA to an active site cysteine. We report that C1 to C10 alkyl-CoA disulfides irreversibly inhibit Escherichia coli Fab ...

    The first step of the reaction catalyzed by the homodimeric FabH from a dissociated fatty acid synthase is acyl transfer from acyl-CoA to an active site cysteine. We report that C1 to C10 alkyl-CoA disulfides irreversibly inhibit Escherichia coli FabH (ecFabH) and Mycobacterium tuberculosis FabH with relative efficiencies that reflect these enzymes' differential acyl-group specificity. Crystallographic and kinetic studies with MeSSCoA show rapid inhibition of one monomer of ecFabH through formation of a methyl disulfide conjugate with this cysteine. Reaction of the second subunit with either MeSSCoA or acetyl-CoA is much slower. In the presence of malonyl-ACP, the acylation rate of the second subunit is restored to that of the native ecFabH. These observations suggest a catalytic model in which a structurally disordered apo-ecFabH dimer orders on binding either the first substrate, acetyl-CoA, or the inhibitor MeSSCoA, and is restored to a disordered state on binding of malonyl-ACP.

    Organizational Affiliation: 

    Department of Chemistry, Portland State University, Portland, OR 97207, USA.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
3-oxoacyl-[acyl-carrier-protein] synthase 3A, B317Escherichia coliMutation(s): 0 
Gene Names: fabH
EC: 2.3.1.41 (PDB Primary Data), 2.3.1.180 (UniProt)
Find proteins for P0A6R0 (Escherichia coli (strain K12))
Explore P0A6R0 
Go to UniProtKB:  P0A6R0
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
COA
Query on COA
Download Ideal Coordinates CCD File 
A
COENZYME A
C21 H36 N7 O16 P3 S
RGJOEKWQDUBAIZ-IBOSZNHHSA-N		 Ligand Interaction
SO4
Query on SO4
Download Ideal Coordinates CCD File 
B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L		 Ligand Interaction
MEE
Query on MEE
Download Ideal Coordinates CCD File 
A
METHANETHIOL
C H4 S
LSDPWZHWYPCBBB-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.207 
  • R-Value Observed: 0.213 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 64.31α = 90
b = 81.91β = 90
c = 121.75γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
CrystalCleardata reduction
d*TREKdata scaling
CNSphasing

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-06-05
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance