5F0F

Structure of Transcriptional Regulatory Repressor Protein - EthR from Mycobacterium Tuberculosis in complex with compound 15 at 1.76A resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.76 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.202 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Literature

A fragment merging approach towards the development of small molecule inhibitors of Mycobacterium tuberculosis EthR for use as ethionamide boosters.

Nikiforov, P.O.Surade, S.Blaszczyk, M.Delorme, V.Brodin, P.Baulard, A.R.Blundell, T.L.Abell, C.

(2016) Org Biomol Chem 14: 2318-2326

  • DOI: https://doi.org/10.1039/c5ob02630j
  • Primary Citation of Related Structures:  
    5EYR, 5EZG, 5EZH, 5F04, 5F08, 5F0C, 5F0F, 5F0H, 5F1J, 5F27

  • PubMed Abstract: 

    With the ever-increasing instances of resistance to frontline TB drugs there is the need to develop novel strategies to fight the worldwide TB epidemic. Boosting the effect of the existing second-line antibiotic ethionamide by inhibiting the mycobacterial transcriptional repressor protein EthR is an attractive therapeutic strategy. Herein we report the use of a fragment based drug discovery approach for the structure-guided systematic merging of two fragment molecules, each binding twice to the hydrophobic cavity of EthR from M. tuberculosis. These together fill the entire binding pocket of EthR. We elaborated these fragment hits and developed small molecule inhibitors which have a 100-fold improvement of potency in vitro over the initial fragments.


  • Organizational Affiliation

    Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK. ca26@cam.ac.uk.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
HTH-type transcriptional regulator EthR228Mycobacterium tuberculosis CDC1551Mutation(s): 0 
Gene Names: ethRetaRMT3970
UniProt
Find proteins for P9WMC1 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WMC1 
Go to UniProtKB:  P9WMC1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP9WMC1
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
5TD
Query on 5TD

Download Ideal Coordinates CCD File 
B [auth A]4-[4-(3-oxidanylidene-3-pyrrolidin-1-yl-propyl)piperidin-1-yl]benzenecarbonitrile
C19 H25 N3 O
BLOJSAYUWXASOD-UHFFFAOYSA-N
SO4
Query on SO4

Download Ideal Coordinates CCD File 
C [auth A]SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.76 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.202 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 121.29α = 90
b = 121.29β = 90
c = 33.83γ = 90
Software Package:
Software NamePurpose
Aimlessdata scaling
PHASERphasing
REFMACrefinement
PDB_EXTRACTdata extraction
xia2data reduction

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Engineering and Physical Sciences Research CouncilUnited Kingdom--
Bill & Melinda Gates FoundationUnited States--
European Union--

Revision History  (Full details and data files)

  • Version 1.0: 2016-02-03
    Type: Initial release
  • Version 1.1: 2016-02-17
    Changes: Database references
  • Version 1.2: 2017-09-13
    Changes: Author supporting evidence
  • Version 1.3: 2024-01-10
    Changes: Data collection, Database references, Refinement description