5OVY

Crystal structure of MAB_4384 tetR


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.186 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Mechanistic and Structural Insights Into the Unique TetR-Dependent Regulation of a Drug Efflux Pump inMycobacterium abscessus.

Richard, M.Gutierrez, A.V.Viljoen, A.J.Ghigo, E.Blaise, M.Kremer, L.

(2018) Front Microbiol 9: 649-649

  • DOI: https://doi.org/10.3389/fmicb.2018.00649
  • Primary Citation of Related Structures:  
    5OVY

  • PubMed Abstract: 

    Mycobacterium abscessus is an emerging human pathogen causing severe pulmonary infections and is refractory to standard antibiotherapy, yet few drug resistance mechanisms have been reported in this organism. Recently, mutations in MAB_4384 leading to up-regulation of the MmpS5/MmpL5 efflux pump were linked to increased resistance to thiacetazone derivatives. Herein, the DNA-binding activity of MAB_4384 was investigated by electrophoretic mobility shift assays using the palindromic sequence IR S5/L5 located upstream of mmpS5/mmpL5 . Introduction of point mutations within IR S5/L5 identified the sequence requirements for optimal binding of the regulator. Moreover, formation of the protein/IR S5/L5 complex was severely impaired for MAB_4384 harboring D14N or F57L substitutions. IR S5/L5 /lacZ reporter fusions in M. abscessus demonstrated increased β-galactosidase activity either in strains lacking a functional MAB_4384 or in cultures treated with the TAC analogs. In addition, X-ray crystallography confirmed a typical TetR homodimeric structure of MAB_4384 and unraveled a putative ligand binding site in which the analogs could be docked. Overall, these results support drug recognition of the MAB_4384 TetR regulator, alleviating its binding to IR S5/L5 and steering up-regulation of MmpS5/MmpL5. This study provides new mechanistic and structural details of TetR-dependent regulatory mechanisms of efflux pumps and drug resistance in mycobacteria.


  • Organizational Affiliation

    CNRS UMR 9004, Institut de Recherche en Infectiologie de Montpellier, Université de Montpellier, Montpellier, France.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Putative transcriptional regulator, TetR familyA [auth B],
B [auth A]
222Mycobacteroides abscessus ATCC 19977Mutation(s): 0 
Gene Names: MAB_4384
UniProt
Find proteins for B1MJU8 (Mycobacteroides abscessus (strain ATCC 19977 / DSM 44196 / CCUG 20993 / CIP 104536 / JCM 13569 / NCTC 13031 / TMC 1543 / L948))
Explore B1MJU8 
Go to UniProtKB:  B1MJU8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB1MJU8
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.186 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 40.8α = 90
b = 100.82β = 105.83
c = 56.09γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
PHASERphasing
AutoSolphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-03-28
    Type: Initial release
  • Version 1.1: 2018-05-02
    Changes: Data collection, Database references
  • Version 1.2: 2024-05-08
    Changes: Data collection, Database references