Solution structure of RfaH C-terminal domain from Vibrio cholerae

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 80 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report

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Structural and thermodynamic analyses of the beta-to-alpha transformation in RfaH reveal principles of fold-switching proteins.

Zuber, P.K.Daviter, T.Heissmann, R.Persau, U.Schweimer, K.Knauer, S.H.

(2022) Elife 11

  • DOI: https://doi.org/10.7554/eLife.76630
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The two-domain protein RfaH, a paralog of the universally conserved NusG/Spt5 transcription factors, is regulated by autoinhibition coupled to the reversible conformational switch of its 60-residue C-terminal Kyrpides, Ouzounis, Woese (KOW) domain between an α-hairpin and a β-barrel. In contrast, NusG/Spt5-KOW domains only occur in the β-barrel state. To understand the principles underlying the drastic fold switch in RfaH, we elucidated the thermodynamic stability and the structural dynamics of two RfaH- and four NusG/Spt5-KOW domains by combining biophysical and structural biology methods. We find that the RfaH-KOW β-barrel is thermodynamically less stable than that of most NusG/Spt5-KOWs and we show that it is in equilibrium with a globally unfolded species, which, strikingly, contains two helical regions that prime the transition toward the α-hairpin. Our results suggest that transiently structured elements in the unfolded conformation might drive the global folding transition in metamorphic proteins in general.

  • Organizational Affiliation

    Biochemistry IV - Biophysical Chemistry, University of Bayreuth, Bayreuth, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Transcription/translation regulatory transformer protein RfaH67Vibrio choleraeMutation(s): 0 
Gene Names: rfaHFLM11_14060FPW41_04940
Find proteins for Q9KTB3 (Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961))
Explore Q9KTB3 
Go to UniProtKB:  Q9KTB3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9KTB3
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 80 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
German Research FoundationGermanyRo617/21-1

Revision History  (Full details and data files)

  • Version 1.0: 2021-11-24
    Type: Initial release
  • Version 1.1: 2022-12-07
    Changes: Database references