Crystal structure of the HigB1 toxin mutant K95A from Mycobacterium tuberculosis (Rv1955)

Experimental Data Snapshot

  • Resolution: 1.91 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.212 

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Substrate recognition and cryo-EM structure of the ribosome-bound TAC toxin of Mycobacterium tuberculosis.

Mansour, M.Giudice, E.Xu, X.Akarsu, H.Bordes, P.Guillet, V.Bigot, D.J.Slama, N.D'urso, G.Chat, S.Redder, P.Falquet, L.Mourey, L.Gillet, R.Genevaux, P.

(2022) Nat Commun 13: 2641-2641

  • DOI: https://doi.org/10.1038/s41467-022-30373-w
  • Primary Citation of Related Structures:  
    7AWK, 7NBU

  • PubMed Abstract: 

    Toxins of toxin-antitoxin systems use diverse mechanisms to control bacterial growth. Here, we focus on the deleterious toxin of the atypical tripartite toxin-antitoxin-chaperone (TAC) system of Mycobacterium tuberculosis, whose inhibition requires the concerted action of the antitoxin and its dedicated SecB-like chaperone. We show that the TAC toxin is a bona fide ribonuclease and identify exact cleavage sites in mRNA targets on a transcriptome-wide scale in vivo. mRNA cleavage by the toxin occurs after the second nucleotide of the ribosomal A-site codon during translation, with a strong preference for CCA codons in vivo. Finally, we report the cryo-EM structure of the ribosome-bound TAC toxin in the presence of native M. tuberculosis cspA mRNA, revealing the specific mechanism by which the TAC toxin interacts with the ribosome and the tRNA in the P-site to cleave its mRNA target.

  • Organizational Affiliation

    Laboratoire de Microbiologie et de Génétique Moléculaires, Centre de Biologie Intégrative (CBI), Université de Toulouse, CNRS, UPS, Toulouse, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Probable endoribonuclease HigB1130Mycobacterium tuberculosis H37RvMutation(s): 1 
Gene Names: higB1higBRv1955
EC: 3.1
Find proteins for P9WJA5 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WJA5 
Go to UniProtKB:  P9WJA5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP9WJA5
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.91 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.212 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 43.975α = 90
b = 82.054β = 90
c = 38.047γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Agence Nationale de la Recherche (ANR)FranceANR-189-CE12-0026-03

Revision History  (Full details and data files)

  • Version 1.0: 2021-11-24
    Type: Initial release
  • Version 1.1: 2022-05-18
    Changes: Database references
  • Version 1.2: 2022-05-25
    Changes: Database references