Solution NMR structure of the HicA toxin from Burkholderia pseudomallei

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 10 
  • Selection Criteria: LOWEST ENERGY 

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The Hica Toxin from Burkholderia Pseudomallei Has a Role in Persister Cell Formation.

Butt, A.Higman, V.A.Williams, C.Crump, M.P.Hemsley, C.M.Harmer, N.Titball, R.W.

(2014) Biochem J 459: 333

  • DOI: https://doi.org/10.1042/BJ20140073
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    TA (toxin-antitoxin) systems are widely distributed amongst bacteria and are associated with the formation of antibiotic tolerant (persister) cells that may have involvement in chronic and recurrent disease. We show that overexpression of the Burkholderia pseudomallei HicA toxin causes growth arrest and increases the number of persister cells tolerant to ciprofloxacin or ceftazidime. Furthermore, our data show that persistence towards ciprofloxacin or ceftazidime can be differentially modulated depending on the level of induction of HicA expression. Deleting the hicAB locus from B. pseudomallei K96243 significantly reduced persister cell frequencies following exposure to ciprofloxacin, but not ceftazidime. The structure of HicA(H24A) was solved by NMR and forms a dsRBD-like (dsRNA-binding domain-like) fold, composed of a triple-stranded β-sheet, with two helices packed against one face. The surface of the protein is highly positively charged indicative of an RNA-binding protein and His24 and Gly22 were functionality important residues. This is the first study demonstrating a role for the HicAB system in bacterial persistence and the first structure of a HicA protein that has been experimentally characterized.

  • Organizational Affiliation

    †School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
HICA66Burkholderia pseudomallei K96243Mutation(s): 1 
Find proteins for Q63NA6 (Burkholderia pseudomallei (strain K96243))
Explore Q63NA6 
Go to UniProtKB:  Q63NA6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ63NA6
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 10 
  • Selection Criteria: LOWEST ENERGY 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-04-23
    Type: Initial release
  • Version 1.1: 2016-05-04
    Changes: Atomic model, Other