4CXF

Structure of CnrH in complex with the cytosolic domain of CnrY

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.201 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.175 

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This is version 1.1 of the entry. See complete history. 


Literature

The Crystal Structure of the Anti-Sigma Factor Cnry in Complex with the Sigma Factor Cnrh Shows a New Structural Class of Anti- Sigma Factors Targeting Extracytoplasmic-Function Sigma Factors.

Maillard, A.P., Girard, E., Ziani, W., Petit-Hartlein, I., Kahn, R., Coves, J.

(2014) J Mol Biol 426: 2313

  • DOI: 10.1016/j.jmb.2014.04.003
  • Primary Citation of Related Structures:  
    4CXF

  • PubMed Abstract: 

    • Gene expression in bacteria is regulated at the level of transcription initiation, a process driven by σ factors. The regulation of σ factor activity proceeds from the regulation of their cytoplasmic availability, which relies on specific inhibitory prot ...

    Gene expression in bacteria is regulated at the level of transcription initiation, a process driven by σ factors. The regulation of σ factor activity proceeds from the regulation of their cytoplasmic availability, which relies on specific inhibitory proteins called anti-σ factors. With anti-σ factors regulating their availability according to diverse cues, extracytoplasmic function σ factors (σ(ECF)) form a major signal transduction system in bacteria. Here, structure:function relationships have been characterized in an emerging class of minimal-size transmembrane anti-σ factors, using CnrY from Cupriavidus metallidurans CH34 as a model. This study reports the 1.75-Å-resolution structure of CnrY cytosolic domain in complex with CnrH, its cognate σ(ECF), and identifies a small hydrophobic knob in CnrY as the major determinant of this interaction in vivo. Unsuspected structural similarity with the molecular switch regulating the general stress response in α-proteobacteria unravels a new class of anti-σ factors targeting σ(ECF). Members of this class carry out their function via a 30-residue stretch that displays helical propensity but no canonical structure on its own.

    Organizational Affiliation: 

    Université Grenoble Alpes, Commissariat à l'Energie Atomique et aux Energies Alternatives, Centre National de la Recherche Scientifique, and Institut de Biologie Structurale, F-38000 Grenoble, France.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
RNA POLYMERASE SIGMA FACTOR CNRH A191Cupriavidus metallidurans CH34Mutation(s): 0 
Gene Names: cnrH, Rmet_6207, RMe0086
Find proteins for P37978 (Cupriavidus metallidurans (strain ATCC 43123 / DSM 2839 / NBRC 102507 / CH34))
Explore P37978 
Go to UniProtKB:  P37978
Protein Feature View
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  • Reference Sequence
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
CNRY B95Cupriavidus metallidurans CH34Mutation(s): 0 
Gene Names: cnrY, ORF0b, Rmet_6205, RMe0088
Find proteins for P56621 (Cupriavidus metallidurans (strain ATCC 43123 / DSM 2839 / NBRC 102507 / CH34))
Explore P56621 
Go to UniProtKB:  P56621
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.201 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.175 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 61.01α = 90
b = 79.122β = 90
c = 80.537γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
SCALAdata scaling
SHARPphasing

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-04-30
    Type: Initial release
  • Version 1.1: 2014-06-04
    Changes: Database references