5CWA

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.207 

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.,Sect.D 71: 2297-2308

  • DOI: 10.1107/S1399004715017216

  • 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.,School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Anthranilate synthase component 1
A
513Mycobacterium tuberculosis (strain CDC 1551 / Oshkosh)Mutation(s): 1 
Gene Names: trpE
EC: 4.1.3.27
Find proteins for P9WFX2 (Mycobacterium tuberculosis (strain CDC 1551 / Oshkosh))
Go to UniProtKB:  P9WFX2
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

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

Download SDF File 
Download CCD File 
A
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
0GA
Query on 0GA

Download SDF File 
Download CCD File 
A
3-{[(1Z)-1-carboxyprop-1-en-1-yl]oxy}-2-hydroxybenzoic acid
C11 H10 O6
MPHSNGOSXHODDD-UQCOIBPSSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
0GAIC50: 17000 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.207 
  • Space Group: P 64 2 2
Unit Cell:
Length (Å)Angle (°)
a = 156.406α = 90.00
b = 156.406β = 90.00
c = 128.384γ = 120.00
Software Package:
Software NamePurpose
MOLREPphasing
SCALAdata scaling
XDSdata reduction
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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