4B3H

Crystal structure of Mycobacterium tuberculosis fatty acid beta- oxidation complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.197 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structure of Mycobacterial Beta-Oxidation Trifunctional Enzyme Reveals its Altered Assembly and Putative Substrate Channeling Pathway.

Venkatesan, R.Wierenga, R.K.

(2013) ACS Chem Biol 8: 1063

  • DOI: 10.1021/cb400007k
  • Primary Citation of Related Structures:  
    4B3H, 4B3I, 4B3J

  • PubMed Abstract: 
  • The incidence of tuberculosis is increasing due to the appearance of new drug-resistant variants. A thorough understanding of the disease organism is essential in order to create more effective drugs. In an attempt to understand better the poorly studied lipid metabolism of Mycobacterium tuberculosis (Mtb), we identified and characterized its fatty acid β-oxidation complex (trifunctional enzyme (TFE)) ...

    The incidence of tuberculosis is increasing due to the appearance of new drug-resistant variants. A thorough understanding of the disease organism is essential in order to create more effective drugs. In an attempt to understand better the poorly studied lipid metabolism of Mycobacterium tuberculosis (Mtb), we identified and characterized its fatty acid β-oxidation complex (trifunctional enzyme (TFE)). TFE is an α(2)β(2) complex consisting of two types of polypeptides catalyzing three of the four reactions of the β-oxidation of fatty acids. The kinetic constants (k(cat) and K(m)) show that the complexed α chain is more active than the individual α chain. Crystal structures of Mtb TFE (mtTFE) reveal that the quaternary assembly is strikingly different from the already known Pseudomonas fragi TFE (pfTFE) assembly due to the presence of a helical insertion (LA5) in the mtTFE-β subunit. This helical insertion prevents the pfTFE mode of assembly, as it would clash with helix H9A of the TFE-α chain. The mtTFE assembly appears to be more rigid and results in a different substrate channeling path between the α and the β subunits. Structural comparisons suggest that the mtTFE active sites can accommodate bulkier fatty acyl chains than in pfTFE. Although another thiolase (FadA2), more closely related to human TFE-β/thiolase, is present in the Mtb genome, it does not form a complex with mtTFE-α. Extensive phylogenetic analyses show that there are at least four TFE subfamilies. Our studies highlight the molecular properties of mtTFE, significantly extending the structural knowledge on this type of very interesting multifunctional enzymes.


    Organizational Affiliation

    Department of Biochemistry and Biocenter Oulu, University of Oulu, Oulu 90014, Finland.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
FATTY ACID BETA-OXIDATION COMPLEX ALPHA-CHAIN FADBA, B736Mycobacterium tuberculosis H37RvMutation(s): 0 
Gene Names: fadBRv0860
EC: 4.2.1.17 (PDB Primary Data), 1.1.1.35 (PDB Primary Data)
UniProt
Find proteins for O53872 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore O53872 
Go to UniProtKB:  O53872
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
FATTY ACID BETA-OXIDATION COMPLEX BETA-CHAIN FADAC, D403Mycobacterium tuberculosis H37RvMutation(s): 0 
Gene Names: fadARv0859
EC: 2.3.1.9 (PDB Primary Data), 2.3.1 (UniProt)
UniProt
Find proteins for O53871 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore O53871 
Go to UniProtKB:  O53871
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download Ideal Coordinates CCD File 
BA [auth C] , CA [auth C] , DA [auth C] , E [auth A] , EA [auth C] , F [auth A] , FA [auth C] , G [auth A] , 
BA [auth C], CA [auth C], DA [auth C], E [auth A], EA [auth C], F [auth A], FA [auth C], G [auth A], GA [auth C], H [auth A], HA [auth C], I [auth A], IA [auth C], J [auth A], K [auth A], KA [auth D], LA [auth D], MA [auth D], NA [auth D], OA [auth D], P [auth B], PA [auth D], Q [auth B], R [auth B], S [auth B], T [auth B], U [auth B], V [auth B], W [auth B], X [auth B]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
GOL
Query on GOL

Download Ideal Coordinates CCD File 
AA [auth B] , JA [auth C] , L [auth A] , M [auth A] , N [auth A] , O [auth A] , QA [auth D] , Y [auth B] , 
AA [auth B], JA [auth C], L [auth A], M [auth A], N [auth A], O [auth A], QA [auth D], Y [auth B], Z [auth B]
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.197 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 249.46α = 90
b = 134.25β = 110.74
c = 118.4γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-03-27
    Type: Initial release
  • Version 1.1: 2013-05-29
    Changes: Database references