6TF4 | pdb_00006tf4

Solution structure of RfaH C-terminal domain from Vibrio cholerae

• PDB DOI: https://doi.org/10.2210/pdb6TF4/pdb
• BMRB: 34450

• Classification: TRANSCRIPTION
• Organism(s): Vibrio cholerae
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2019-11-13 Released: 2021-11-24 
• Deposition Author(s): Zuber, P.K., Schweimer, K., Knauer, S.H.
• Funding Organization(s): German Research Foundation

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Experimental Data Snapshot

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

Literature

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

• PubMed: 36255050 
• DOI: https://doi.org/10.7554/eLife.76630
• Primary Citation Related Structures: 
  6TF4


• 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.

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Organizational Affiliation: 
• Biochemistry IV - Biophysical Chemistry, University of Bayreuth, Bayreuth, Germany.
Birkbeck, University of London, Malet Street, Bloomsbury, London, United Kingdom.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration, light scattering

Macromolecule Content 

• Total Structure Weight: 7.44 kDa 
• Atom Count: 448 
• Modeled Residue Count: 57 
• Deposited Residue Count: 67 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Transcription/translation regulatory transformer protein RfaH	A	67	Vibrio cholerae	Mutation(s): 0  Gene Names: rfaH, FLM11_14060, FPW41_04940
UniProt
Find proteins for Q9KTB3 (Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961)) Explore Q9KTB3  Go to UniProtKB:  Q9KTB3

Experimental Data & Validation

Experimental Data

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

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2021-11-24 
Deposition Author(s): Zuber, P.K., Schweimer, K., Knauer, S.H.

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Funding Organization	Location	Grant Number
German Research Foundation	Germany	Ro617/21-1

Revision History  

• Version 1.0: 2021-11-24
  Type: Initial release
  
• Version 1.1: 2022-12-07
  Changes: Database references
• Version 1.2: 2024-06-19
  Changes: Data collection, Database references