6A7V

Crystal structure of Mycobacterium tuberculosis VapBC11 toxin-antitoxin complex

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.67 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.184 

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Literature

Structural, functional and biological insights into the role of Mycobacterium tuberculosis VapBC11 toxin-antitoxin system: targeting a tRNase to tackle mycobacterial adaptation.

Deep, A., Tiwari, P., Agarwal, S., Kaundal, S., Kidwai, S., Singh, R., Thakur, K.G.

(2018) Nucleic Acids Res 46: 11639-11655

  • DOI: 10.1093/nar/gky924
  • Primary Citation of Related Structures:  
    6A7V

  • PubMed Abstract: 

    • Toxin-antitoxin (TA) systems are involved in diverse physiological processes in prokaryotes, but their exact role in Mycobacterium tuberculosis (Mtb) virulence and in vivo stress adaptation has not been extensively studied. Here, we demonstrate that ...

    Toxin-antitoxin (TA) systems are involved in diverse physiological processes in prokaryotes, but their exact role in Mycobacterium tuberculosis (Mtb) virulence and in vivo stress adaptation has not been extensively studied. Here, we demonstrate that the VapBC11 TA module is essential for Mtb to establish infection in guinea pigs. RNA-sequencing revealed that overexpression of VapC11 toxin results in metabolic slowdown, suggesting that modulation of the growth rate is an essential strategy for in vivo survival. Interestingly, overexpression of VapC11 resulted in the upregulation of chromosomal TA genes, suggesting the existence of highly coordinated crosstalk among TA systems. In this study, we also present the crystal structure of the VapBC11 heterooctameric complex at 1.67 Å resolution. Binding kinetic studies suggest that the binding affinities of toxin-substrate and toxin-antitoxin interactions are comparable. We used a combination of structural studies, molecular docking, mutational analysis and in vitro ribonuclease assays to enhance our understanding of the mode of substrate recognition by the VapC11 toxin. Furthermore, we have also designed peptide-based inhibitors to target VapC11 ribonuclease activity. Taken together, we propose that the structure-guided design of inhibitors against in vivo essential ribonucleases might be a novel strategy to hasten clearance of intracellular Mtb.

    Organizational Affiliation: 

    Structural Biology Laboratory, G. N. Ramachandran Protein Centre, Council of Scientific and Industrial Research-Institute of Microbial Technology (CSIR-IMTECH), Chandigarh 160036, India.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Ribonuclease VapC11A, C, E, G139Mycobacterium tuberculosis H37RvMutation(s): 0 
Gene Names: vapC11, Rv1561, MTCY48.04c
EC: 3.1
Find proteins for P9WFA5 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WFA5 
Go to UniProtKB:  P9WFA5
Protein Feature View
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  • Reference Sequence
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(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Antitoxin VapB11D, H, K, U62Mycobacterium tuberculosis H37RvMutation(s): 0 
Gene Names: vapB11, Rv1560, MTCY48.05c
Find proteins for P9WLU3 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WLU3 
Go to UniProtKB:  P9WLU3
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
1PE
Query on 1PE
Download Ideal Coordinates CCD File 
A
PENTAETHYLENE GLYCOL
C10 H22 O6
JLFNLZLINWHATN-UHFFFAOYSA-N		 Ligand Interaction
SO4
Query on SO4
Download Ideal Coordinates CCD File 
C, U
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.67 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.184 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.555α = 90
b = 127.007β = 90
c = 151.207γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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View more in-depth experimental data

Entry History & Funding Information

Deposition Data

  • Deposited Date: 2018-07-04 
  • Released Date: 2018-10-10 
    • Deposition Author(s): Deep, A., Thakur, K.G.
Funding OrganizationLocationGrant Number
Council of Scientific & Industrial ResearchIndia--

Revision History 

  • Version 1.0: 2018-10-10
    Type: Initial release
  • Version 1.1: 2019-05-01
    Changes: Data collection, Database references, Structure summary