5T2V

Crystal structure of MSMEG_6753 a putative betaketoacyl-ACP reductase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.191 
  • R-Value Work: 0.161 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Binding of NADP(+) triggers an open-to-closed transition in a mycobacterial FabG beta-ketoacyl-ACP reductase.

Blaise, M.Van Wyk, N.Baneres-Roquet, F.Guerardel, Y.Kremer, L.

(2017) Biochem. J. 474: 907-921

  • DOI: 10.1042/BCJ20161052
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The ketoacyl-acyl carrier protein (ACP) reductase FabG catalyzes the NADPH/NADH dependent reduction of β-ketoacyl-ACP substrates to β-hydroxyacyl-ACP products, the first reductive step in the fatty acid biosynthesis elongation cycle. FabG proteins ar ...

    The ketoacyl-acyl carrier protein (ACP) reductase FabG catalyzes the NADPH/NADH dependent reduction of β-ketoacyl-ACP substrates to β-hydroxyacyl-ACP products, the first reductive step in the fatty acid biosynthesis elongation cycle. FabG proteins are ubiquitous in bacteria and are part of the type II fatty acid synthase system. Mining the Mycobacterium smegmatis genome uncovered several putative FabG-like proteins. Among them, we identified M. smegmatis MSMEG_6753 whose gene was found adjacent to MSMEG_6754 , encoding a recently characterized enoyl-CoA dehydratase, and to MSMEG_6755 , encoding another potential reductase. Recombinantly expressed and purified MSMEG_6753 exhibits ketoacyl reductase activity in the presence of acetoacetyl-CoA and NADPH. This activity was subsequently confirmed by functional complementation studies in a fabG thermosensitive Escherichia coli mutant. Furthermore, comparison of the apo and the NADP + -bound MSMEG_6753 crystal structures showed that cofactor binding induces a closed conformation of the protein. A Δ MSMEG_6753 deletion mutant could be generated in M. smegmatis , indicating that this gene is dispensable for mycobacterial growth. Overall, these results showcase the diversity of FabG-like proteins in mycobacteria and new structural features regarding the catalytic mechanism of this important family of enzymes that may be of importance for the rational design of specific FabG inhibitors.


    Organizational Affiliation

    Unité de Glycobiologie Structurale et Fonctionnelle, CNRS UMR 8576, IFR 147, Université des Sciences et Technologies de Lille, 59655 Villeneuve d'Ascq cedex, France.,Centre d'étude d'agents Pathogènes et Biotechnologies pour la Santé (CPBS), Université de Montpellier, CNRS, FRE 3689, 34293 Montpellier, France mickael.blaise@cpbs.cnrs.fr laurent.kremer@cpbs.cnrs.fr.,Centre d'étude d'agents Pathogènes et Biotechnologies pour la Santé (CPBS), Université de Montpellier, CNRS, FRE 3689, 34293 Montpellier, France.,INSERM, CPBS, 1919 route de Mende, 34293 Montpellier, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Oxidoreductase, short chain dehydrogenase/reductase family protein
A
248Mycolicibacterium smegmatis (strain ATCC 700084 / mc(2)155)Mutation(s): 0 
Find proteins for A0R723 (Mycolicibacterium smegmatis (strain ATCC 700084 / mc(2)155))
Go to UniProtKB:  A0R723
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MG
Query on MG

Download SDF File 
Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.191 
  • R-Value Work: 0.161 
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 73.930α = 90.00
b = 75.500β = 90.00
c = 77.260γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
PHENIXrefinement
PHASERphasing
XSCALEdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2017-02-15
    Type: Initial release
  • Version 1.1: 2017-03-22
    Type: Database references