4UHJ

Crystal structure of the receiver domain of CpxR from E. coli (orthorhombic form)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.200 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural Coupling between Autokinase and Phosphotransferase Reactions in a Bacterial Histidine Kinase.

Mechaly, A.E.Soto Diaz, S.Sassoon, N.Buschiazzo, A.Betton, J.M.Alzari, P.M.

(2017) Structure 25: 939-944.e3

  • DOI: https://doi.org/10.1016/j.str.2017.04.011
  • Primary Citation of Related Structures:  
    4UHJ, 4UHK, 5LFK

  • PubMed Abstract: 

    Bacterial two-component systems consist of a sensor histidine kinase (HK) and a response regulator (RR). HKs are homodimers that catalyze the autophosphorylation of a histidine residue and the subsequent phosphoryl transfer to its RR partner, triggering an adaptive response. How the HK autokinase and phosphotransferase activities are coordinated remains unclear. Here, we report X-ray structures of the prototypical HK CpxA trapped as a hemi-phosphorylated dimer, and of the receiver domain from the RR partner, CpxR. Our results reveal that the two catalytic reactions can occur simultaneously, one in each protomer of the asymmetric CpxA dimer. Furthermore, the increase of autokinase activity in the presence of phosphotransfer-impaired CpxR put forward the idea of an allosteric switching mechanism, according to which CpxR binding to one CpxA protomer triggers autophosphorylation in the second protomer. The ensuing dynamical model provides a mechanistic explanation of how HKs can efficiently orchestrate two catalytic reactions involving large-scale protein motions.


  • Organizational Affiliation

    Institut Pasteur, Unité de Microbiologie Structurale, CNRS UMR 3528 & Université Paris Diderot, Sorbonne Paris Cité, 25 rue du Dr. Roux, 75724, Paris Cedex 15, France. Electronic address: aemechaly@pasteur.edu.uy.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
TRANSCRIPTIONAL REGULATORY PROTEIN CPXR
A, B, C
136Escherichia coli K-12Mutation(s): 0 
UniProt
Find proteins for P0AE88 (Escherichia coli (strain K12))
Explore P0AE88 
Go to UniProtKB:  P0AE88
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0AE88
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.200 
  • Space Group: P 21 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 66.466α = 90
b = 73.873β = 90
c = 88.362γ = 90
Software Package:
Software NamePurpose
BUSTERrefinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-04-13
    Type: Initial release
  • Version 1.1: 2017-06-21
    Changes: Database references
  • Version 1.2: 2024-05-08
    Changes: Data collection, Database references, Derived calculations, Other