2QX1

Crystal structure of the complex between mycobacterium tuberculosis beta-ketoacyl-acyl carrier protein synthase III (FABH) and decyl-COA disulfide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.316 
  • R-Value Work: 0.242 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Probing reactivity and substrate specificity of both subunits of the dimeric Mycobacterium tuberculosis FabH using alkyl-CoA disulfide inhibitors and acyl-CoA substrates

Sachdeva, S.Musayev, F.Alhamadsheh, M.M.Neel Scarsdale, J.Tonie Wright, H.Reynolds, K.A.

(2008) Bioorg.Chem. 36: 85-90

  • DOI: 10.1016/j.bioorg.2007.11.001

  • PubMed Abstract: 
  • The dimeric Mycobacterium tuberculosis FabH (mtFabH) catalyses a Claisen-type condensation between an acyl-CoA and malonyl-acyl carrier protein (ACP) to initiate the Type II fatty acid synthase cycle. To analyze the initial covalent acylation of mtFa ...

    The dimeric Mycobacterium tuberculosis FabH (mtFabH) catalyses a Claisen-type condensation between an acyl-CoA and malonyl-acyl carrier protein (ACP) to initiate the Type II fatty acid synthase cycle. To analyze the initial covalent acylation of mtFabH with acyl-CoA, we challenged it with mixture of C6-C20 acyl-CoAs and the ESI-MS analysis showed reaction at both subunits and a strict specificity for C12 acyl CoA. Crystallographic and ESI-MS studies of mtFabH with a decyl-CoA disulfide inhibitor revealed a decyl chain bound in acyl-binding channels of both subunits through disulfide linkage to the active site cysteine. These data provide the first unequivocal evidence that both subunits of mtFabH can react with substrates or inhibitor. The discrepancy between the observed C12 acyl-CoA substrate specificity in the initial acylation step and the higher catalytic efficiency of mtFabH for C18-C20 acyl-CoA substrates in the overall mtFabH catalyzed reaction suggests a role for M. tuberculosis ACP as a specificity determinant in this reaction.


    Related Citations: 
    • Crystal structure of a substrate complex of mycobacterium tuberculosis beta-keto-acyl acyl carrier protein synthase III (FABH) with lauroyl coenzyme A
      Musayev, F.,Sachdeva, S.,Scarsdale, J.N.,Reynolds, K.A.,Wright, H.T.
      (2005) J.Mol.Biol. 346: 1313
    • Crystal structure of the mycobacterium beta-keto-acyl acyl carrier protein synthase III
      Scarsdale, J.N.,Kazanina, G.,He, X.,Reynolds, K.A.,Wright, H.T.
      (2001) J.Biol.Chem. 276: 20516


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Beta-ketoacyl-ACP synthase III
A, B
335Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)Mutation(s): 0 
Gene Names: fabH
EC: 2.3.1.180
Find proteins for P9WNG3 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Go to UniProtKB:  P9WNG3
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
D1T
Query on D1T

Download SDF File 
Download CCD File 
A, B
DECANE-1-THIOL
C10 H22 S
VTXVGVNLYGSIAR-UHFFFAOYSA-N
 Ligand Interaction
COA
Query on COA

Download SDF File 
Download CCD File 
A
COENZYME A
C21 H36 N7 O16 P3 S
RGJOEKWQDUBAIZ-IBOSZNHHSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.316 
  • R-Value Work: 0.242 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 67.649α = 90.00
b = 89.365β = 90.00
c = 232.006γ = 90.00
Software Package:
Software NamePurpose
d*TREKdata scaling
CrystalCleardata collection
CrystalCleardata reduction
CNSphasing
CNSrefinement
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-03-18
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance