3N0R

Structure of the PhyR stress response regulator at 1.25 Angstrom resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.25 Å
  • R-Value Free: 0.173 
  • R-Value Work: 0.154 
  • R-Value Observed: 0.154 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

A structural model of anti-anti-sigma inhibition by a two-component receiver domain: the PhyR stress response regulator

Herrou, J.Foreman, R.Fiebig, A.Crosson, S.

(2010) Mol Microbiol 78: 290-304

  • DOI: 10.1111/j.1365-2958.2010.07323.x
  • Primary Citation of Related Structures:  
    3N0R

  • PubMed Abstract: 
  • PhyR is a hybrid stress regulator conserved in α-proteobacteria that contains an N-terminal σ-like (SL) domain and a C-terminal receiver domain. Phosphorylation of the receiver domain is known to promote binding of the SL domain to an anti-σ factor. PhyR thus functions as an anti-anti-σ factor in its phosphorylated state ...

    PhyR is a hybrid stress regulator conserved in α-proteobacteria that contains an N-terminal σ-like (SL) domain and a C-terminal receiver domain. Phosphorylation of the receiver domain is known to promote binding of the SL domain to an anti-σ factor. PhyR thus functions as an anti-anti-σ factor in its phosphorylated state. We present genetic evidence that Caulobacter crescentus PhyR is a phosphorylation-dependent stress regulator that functions in the same pathway as σ(T) and its anti-σ factor, NepR. Additionally, we report the X-ray crystal structure of PhyR at 1.25 Å resolution, which provides insight into the mechanism of anti-anti-σ regulation. Direct intramolecular contact between the PhyR receiver and SL domains spans regions σ₂ and σ₄, likely serving to stabilize the SL domain in a closed conformation. The molecular surface of the receiver domain contacting the SL domain is the structural equivalent of α4-β5-α5, which is known to undergo dynamic conformational change upon phosphorylation in a diverse range of receiver proteins. We propose a structural model of PhyR regulation in which receiver phosphorylation destabilizes the intramolecular interaction between SL and receiver domains, thereby permitting regions σ₂ and σ₄ in the SL domain to open about a flexible connector loop and bind anti-σ factor.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, The University of Chicago, Chicago, IL, USA. The Committee on Microbiology, The University of Chicago, Chicago, IL, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Response regulatorA286Caulobacter vibrioidesMutation(s): 1 
Gene Names: CC_3477PhyR
Find proteins for Q9A2S9 (Caulobacter vibrioides (strain ATCC 19089 / CB15))
Explore Q9A2S9 
Go to UniProtKB:  Q9A2S9
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL

Download Ideal Coordinates CCD File 
B [auth A]GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
AL-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.25 Å
  • R-Value Free: 0.173 
  • R-Value Work: 0.154 
  • R-Value Observed: 0.154 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 45.182α = 90
b = 61.198β = 108.73
c = 53.025γ = 90
Software Package:
Software NamePurpose
MAR345dtbdata collection
PHASERphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-08-11
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance