5CWA

Structure of Anthranilate Synthase Component I (TrpE) from Mycobacterium tuberculosis with inhibitor bound


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.207 
  • R-Value Observed: 0.209 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structure and inhibition of subunit I of the anthranilate synthase complex of Mycobacterium tuberculosis and expression of the active complex.

Bashiri, G.Johnston, J.M.Evans, G.L.Bulloch, E.M.Goldstone, D.C.Jirgis, E.N.Kleinboelting, S.Castell, A.Ramsay, R.J.Manos-Turvey, A.Payne, R.J.Lott, J.S.Baker, E.N.

(2015) Acta Crystallogr D Biol Crystallogr 71: 2297-2308

  • DOI: 10.1107/S1399004715017216
  • Primary Citation of Related Structures:  
    5CWA

  • PubMed Abstract: 
  • The tryptophan-biosynthesis pathway is essential for Mycobacterium tuberculosis (Mtb) to cause disease, but not all of the enzymes that catalyse this pathway in this organism have been identified. The structure and function of the enzyme complex that ...

    The tryptophan-biosynthesis pathway is essential for Mycobacterium tuberculosis (Mtb) to cause disease, but not all of the enzymes that catalyse this pathway in this organism have been identified. The structure and function of the enzyme complex that catalyses the first committed step in the pathway, the anthranilate synthase (AS) complex, have been analysed. It is shown that the open reading frames Rv1609 (trpE) and Rv0013 (trpG) encode the chorismate-utilizing (AS-I) and glutamine amidotransferase (AS-II) subunits of the AS complex, respectively. Biochemical assays show that when these subunits are co-expressed a bifunctional AS complex is obtained. Crystallization trials on Mtb-AS unexpectedly gave crystals containing only AS-I, presumably owing to its selective crystallization from solutions containing a mixture of the AS complex and free AS-I. The three-dimensional structure reveals that Mtb-AS-I dimerizes via an interface that has not previously been seen in AS complexes. As is the case in other bacteria, it is demonstrated that Mtb-AS shows cooperative allosteric inhibition by tryptophan, which can be rationalized based on interactions at this interface. Comparative inhibition studies on Mtb-AS-I and related enzymes highlight the potential for single inhibitory compounds to target multiple chorismate-utilizing enzymes for TB drug discovery.


    Organizational Affiliation

    School of Biological Sciences, University of Auckland, 3a Symonds Steet, Private Bag 90210, Auckland 1142, New Zealand.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Anthranilate synthase component 1A513Mycobacterium tuberculosis CDC1551Mutation(s): 1 
Gene Names: trpEMT1644
EC: 4.1.3.27
Find proteins for P9WFX2 (Mycobacterium tuberculosis (strain CDC 1551 / Oshkosh))
Explore P9WFX2 
Go to UniProtKB:  P9WFX2
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
0GA
Query on 0GA

Download CCD File 
A
3-{[(1Z)-1-carboxyprop-1-en-1-yl]oxy}-2-hydroxybenzoic acid
C11 H10 O6
MPHSNGOSXHODDD-UQCOIBPSSA-N
 Ligand Interaction
SO4
Query on SO4

Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
GOL
Query on GOL

Download CCD File 
A
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
UNL
Query on UNL

Download CCD File 
A
Unknown ligand
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
0GAIC50:  17000   nM  Binding MOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.207 
  • R-Value Observed: 0.209 
  • Space Group: P 64 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 156.406α = 90
b = 156.406β = 90
c = 128.384γ = 120
Software Package:
Software NamePurpose
XDSdata reduction
SCALAdata scaling
MOLREPphasing
REFMACrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-08-12
    Type: Initial release
  • Version 1.1: 2015-11-18
    Changes: Database references
  • Version 1.2: 2017-11-01
    Changes: Author supporting evidence, Data collection, Derived calculations