M. tuberculosis [4Fe-4S] protein WhiB1 is a four-helix bundle that forms a NO-sensitive complex with sigmaA and regulates the major virulence factor ESX-1

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 62 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report

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Structure of a Wbl protein and implications for NO sensing by M. tuberculosis.

Kudhair, B.K.Hounslow, A.M.Rolfe, M.D.Crack, J.C.Hunt, D.M.Buxton, R.S.Smith, L.J.Le Brun, N.E.Williamson, M.P.Green, J.

(2017) Nat Commun 8: 2280-2280

  • DOI: https://doi.org/10.1038/s41467-017-02418-y
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Mycobacterium tuberculosis causes pulmonary tuberculosis (TB) and claims ~1.8 million human lives per annum. Host nitric oxide (NO) is important in controlling TB infection. M. tuberculosis WhiB1 is a NO-responsive Wbl protein (actinobacterial iron-sulfur proteins first identified in the 1970s). Until now, the structure of a Wbl protein has not been available. Here a NMR structural model of WhiB1 reveals that Wbl proteins are four-helix bundles with a core of three α-helices held together by a [4Fe-4S] cluster. The iron-sulfur cluster is required for formation of a complex with the major sigma factor (σ A ) and reaction with NO disassembles this complex. The WhiB1 structure suggests that loss of the iron-sulfur cluster (by nitrosylation) permits positively charged residues in the C-terminal helix to engage in DNA binding, triggering a major reprogramming of gene expression that includes components of the virulence-critical ESX-1 secretion system.

  • Organizational Affiliation

    Molecular Biology and Biotechnology, University of Sheffield, Sheffield, S10 2TN, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Transcriptional regulator WhiB194Mycobacterium tuberculosis H37RvMutation(s): 0 
Gene Names: whiB1Rv3219
Find proteins for P9WF43 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WF43 
Go to UniProtKB:  P9WF43
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP9WF43
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
SF4 (Subject of Investigation/LOI)
Query on SF4

Download Ideal Coordinates CCD File 
Fe4 S4
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 62 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Biotechnology and Biological Sciences Research CouncilUnited KingdomBB/K000071/1
Biotechnology and Biological Sciences Research CouncilUnited KingdomBB/L008114/1

Revision History  (Full details and data files)

  • Version 1.0: 2018-01-03
    Type: Initial release
  • Version 2.0: 2018-01-10
    Changes: Atomic model
  • Version 2.1: 2024-05-15
    Changes: Data collection, Database references