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

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.207 
  • R-Value Observed: 0.209 

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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: https://doi.org/10.1107/S1399004715017216
  • Primary Citation of Related Structures:  

  • 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 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.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Anthranilate synthase component 1513Mycobacterium tuberculosis CDC1551Mutation(s): 1 
Gene Names: trpEMT1644
Find proteins for P9WFX2 (Mycobacterium tuberculosis (strain CDC 1551 / Oshkosh))
Explore P9WFX2 
Go to UniProtKB:  P9WFX2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP9WFX2
Sequence Annotations
  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
0GA Binding MOAD:  5CWA IC50: 1.70e+4 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • 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

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • 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
  • Version 1.3: 2023-09-27
    Changes: Data collection, Database references, Refinement description