4V12

Crystal structure of the MSMEG_6754 dehydratase from Mycobacterium smegmatis

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.178 
  • R-Value Work: 0.159 
  • R-Value Observed: 0.160 

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This is version 1.3 of the entry. See complete history. 


Literature

A New Dehydratase Conferring Innate Resistance to Thiacetazone and Intra-Amoebal Survival of Mycobacterium Smegmatis.

Carrere-Kremer, S., Blaise, M., Singh, V.K., Alibaud, L., Tuaillon, E., Halloum, I., Van De Weerd, R., Guerardel, Y., Drancourt, M., Takiff, H., Geurtsen, J., Kremer, L.

(2015) Mol Microbiol 96: 1085

  • DOI: 10.1111/mmi.12992
  • Primary Citation of Related Structures:  
    4V12

  • PubMed Abstract: 

    • Nontuberculous mycobacteria are innately resistant to most antibiotics, although the mechanisms responsible for their drug resistance remain poorly understood. They are particularly refractory to thiacetazone (TAC), a second-line antitubercular drug. Herein, we identified MSMEG_6754 as essential for the innate resistance of Mycobacterium smegmatis to TAC ...

    Nontuberculous mycobacteria are innately resistant to most antibiotics, although the mechanisms responsible for their drug resistance remain poorly understood. They are particularly refractory to thiacetazone (TAC), a second-line antitubercular drug. Herein, we identified MSMEG_6754 as essential for the innate resistance of Mycobacterium smegmatis to TAC. Transposon-mediated and targeted disruption of MSMEG_6754 resulted in hypersusceptibility to TAC. Conversely, introduction of MSMEG_6754 into Mycobacterium tuberculosis increased resistance 100-fold. Resolution of the crystal structure of MSMEG_6754 revealed a homodimer in which each monomer comprises two hot-dog domains characteristic of dehydratase-like proteins and very similar to the HadAB complex involved in mycolic acid biosynthesis. Gene inactivation of the essential hadB dehydratase could be achieved in M. smegmatis and M. tuberculosis only when the strains carried an integrated copy of MSMEG_6754, supporting the idea that MSMEG_6754 and HadB share redundant dehydratase activity. Using M. smegmatis-Acanthamoeba co-cultures, we found that intra-amoebal growth of the MSMEG_6754 deleted strain was significantly reduced compared with the parental strain. This in vivo growth defect was fully restored upon complementation with catalytically active MSMEG_6754 or HadABC, indicating that MSMEG_6754 plays a critical role in the survival of M. smegmatis within the environmental host.

    Organizational Affiliation: 

    INSERM, DIMNP, Place Eugène Bataillon, 34095 Montpellier Cedex 05, France.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
MAOC LIKE DOMAIN PROTEINA343Mycolicibacterium smegmatisMutation(s): 0 
UniProt
Find proteins for A0R724 (Mycolicibacterium smegmatis (strain ATCC 700084 / mc(2)155))
Explore A0R724 
Go to UniProtKB:  A0R724
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0R724
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
POG
Query on POG
Download Ideal Coordinates CCD File 
B [auth A](20S)-2,5,8,11,14,17-HEXAMETHYL-3,6,9,12,15,18-HEXAOXAHENICOSANE-1,20-DIOL
C21 H44 O8
OWRNLGZKEZSHGO-QAWAPDBNSA-N		 Ligand Interaction
BTB
Query on BTB
Download Ideal Coordinates CCD File 
C [auth A]2-[BIS-(2-HYDROXY-ETHYL)-AMINO]-2-HYDROXYMETHYL-PROPANE-1,3-DIOL
C8 H19 N O5
OWMVSZAMULFTJU-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.178 
  • R-Value Work: 0.159 
  • R-Value Observed: 0.160 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 84.39α = 90
b = 84.39β = 90
c = 122.13γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PHENIXphasing

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 2014-09-23 
  • Released Date: 2015-03-18 
    • Deposition Author(s): Blaise, M.

Revision History  (Full details and data files)

  • Version 1.0: 2015-03-18
    Type: Initial release
  • Version 1.1: 2015-03-25
    Changes: Database references
  • Version 1.2: 2015-06-10
    Changes: Database references
  • Version 1.3: 2017-07-12
    Changes: Refinement description