8YPJ

Cyrstal structure of the MazE-mt10 Antitoxin from Mycobacterium tuberculosis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.91 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.202 

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Literature

DNA binding reveals hidden interdomain allostery of a MazE antitoxin from Mycobacterium tuberculosis.

Eun, H.J.Lee, S.Y.Lee, K.Y.

(2024) Biochem Biophys Res Commun 710: 149898-149898

  • DOI: https://doi.org/10.1016/j.bbrc.2024.149898
  • Primary Citation of Related Structures:  
    8YPJ

  • PubMed Abstract: 

    Type II toxin-antitoxin (TA) systems are ubiquitously distributed genetic elements in prokaryotes and are crucial for cell maintenance and survival under environmental stresses. The antitoxin is a modular protein consisting of the disordered C-terminal region that physically contacts and neutralizes the cognate toxin and the well-folded N-terminal DNA binding domain responsible for autorepression of TA transcription. However, how the two functional domains communicate is largely unknown. Herein, we determined the crystal structure of the N-terminal domain of the type II antitoxin MazE-mt10 from Mycobacterium tuberculosis, revealing a homodimer of the ribbon-helix-helix (RHH) fold with distinct DNA binding specificity. NMR studies demonstrated that full-length MazE-mt10 forms the helical and coiled states in equilibrium within the C-terminal region, and that helical propensity is allosterically enhanced by the N-terminal binding to the cognate operator DNA. This coil-to-helix transition may promote toxin binding/neutralization of MazE-mt10 and further stabilize the TA-DNA transcription repressor. This is supported by many crystal structures of type II TA complexes in which antitoxins form an α-helical structure at the TA interface. The hidden helical state of free MazE-mt10 in solution, favored by DNA binding, adds a new dimension to the regulatory mechanism of type II TA systems. Furthermore, complementary approaches using X-ray crystallography and NMR allow us to study the allosteric interdomain interplay of many other full-length antitoxins of type II TA systems.


  • Organizational Affiliation

    The Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul, 08826, Republic of Korea.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Antitoxin
A, B
75Mycobacterium tuberculosisMutation(s): 0 
UniProt
Find proteins for P9WJ09 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WJ09 
Go to UniProtKB:  P9WJ09
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP9WJ09
Sequence Annotations
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.91 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.202 
  • Space Group: I 2 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 99.37α = 90
b = 99.37β = 90
c = 99.37γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHENIXphasing

Structure Validation

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Entry History & Funding Information

Deposition Data

  • Released Date: 2024-05-15 
  • Deposition Author(s): Lee, K.Y.

Funding OrganizationLocationGrant Number
National Research Foundation (NRF, Korea)Korea, Republic OfNRF-RS-2022-00166782

Revision History  (Full details and data files)

  • Version 1.0: 2024-05-15
    Type: Initial release