1U6E

1.85 Angstrom Crystal Structure of the C112A Mutant of Mycobacterium Tuberculosis Beta-Ketoacyl-Acyl Carrier Protein Synthase III (FabH)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.180 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of a substrate complex of Mycobacterium tuberculosis beta-ketoacyl-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: 1313-1321

  • DOI: 10.1016/j.jmb.2004.12.044
  • Primary Citation of Related Structures:  
  • Also Cited By: 2QX1, 2QO1, 2QO0, 2QNZ, 2QNY, 2QNX

  • PubMed Abstract: 
  • Beta-ketoacyl-acyl carrier protein synthase III (FabH) catalyzes a two step reaction that initiates the pathway of fatty acid biosynthesis in plants and bacteria. In Mycobacterium tuberculosis, FabH catalyzes extension of lauroyl, myristoyl and palmi ...

    Beta-ketoacyl-acyl carrier protein synthase III (FabH) catalyzes a two step reaction that initiates the pathway of fatty acid biosynthesis in plants and bacteria. In Mycobacterium tuberculosis, FabH catalyzes extension of lauroyl, myristoyl and palmitoyl groups from which cell wall mycolic acids of the bacterium are formed. The first step of the reaction is an acyl group transfer from acyl-coenzyme A to the active-site cysteine of the enzyme; the second step is acyl chain extension by two carbon atoms through Claisen condensation with malonyl-acyl carrier protein. We have previously determined the crystal structure of a type II, dissociated M.tuberculosis FabH, which catalyzes extension of lauroyl, myristoyl and palmitoyl groups. Here we describe the first long-chain Michaelis substrate complex of a FabH, that of lauroyl-coenzyme A with a catalytically disabled Cys-->Ala mutant of M.tuberculosis FabH. An elongated channel extending from the mutated active-site cysteine defines the acyl group binding locus that confers unique acyl substrate specificity on M.tuberculosis FabH. CoA lies in a second channel, bound primarily through interactions of its nucleotide group at the enzyme surface. The apparent weak association of CoA in this complex may play a role in the binding and dissociation of long chain acyl-CoA substrates and products and poses questions pertinent to the mechanism of this enzyme.


    Related Citations: 
    • Crystal Structure of the Mycobacterium Tuberculosis beta- ketoacyl-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

    Institute of Structural Biology and Drug Discovery, Department of Medicinal Chemistry, Virginia Commonwealth University, 800 E. Leigh St., Suite 212, Richmond, VA 23219, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
3-oxoacyl-[acyl-carrier-protein] synthase III
A, B
335Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)Mutation(s): 1 
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 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
A, B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.180 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 55.263α = 90.00
b = 109.021β = 90.00
c = 110.976γ = 90.00
Software Package:
Software NamePurpose
CNSphasing
MOSFLMdata reduction
REFMACrefinement
CCP4data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-05-24
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Advisory, Version format compliance