1SOT

Crystal Structure of the DegS stress sensor


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.198 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of the DegS stress sensor: How a PDZ domain recognizes misfolded protein and activates a protease

Wilken, C.Kitzing, K.Kurzbauer, R.Ehrmann, M.Clausen, T.

(2004) Cell 117: 483-494

  • Primary Citation of Related Structures:  1SOZ, 1VCW
  • Also Cited By: 4RQZ, 4RR0, 4RR1

  • PubMed Abstract: 
  • Gram-negative bacteria respond to misfolded proteins in the cell envelope with the sigmaE-driven expression of periplasmic proteases/chaperones. Activation of sigmaE is controlled by a proteolytic cascade that is initiated by the DegS protease. DegS ...

    Gram-negative bacteria respond to misfolded proteins in the cell envelope with the sigmaE-driven expression of periplasmic proteases/chaperones. Activation of sigmaE is controlled by a proteolytic cascade that is initiated by the DegS protease. DegS senses misfolded protein in the periplasm, undergoes autoactivation, and cleaves the antisigma factor RseA. Here, we present the crystal structures of three distinct states of DegS from E. coli. DegS alone exists in a catalytically inactive form. Binding of stress-signaling peptides to its PDZ domain induces a series of conformational changes that activates protease function. Backsoaking of crystals containing the DegS-activator complex revealed the presence of an active/inactive hybrid structure and demonstrated the reversibility of activation. Taken together, the structural data illustrate in molecular detail how DegS acts as a periplasmic stress sensor. Our results suggest a novel regulatory role for PDZ domains and unveil a novel mechanism of reversible protease activation.


    Related Citations: 
    • OMP peptide signals initiate the envelope stress response by activating DegS protease via relief of inhibition mediated by its PDZ domain
      Walsh, N.P.,Alba, B.M.,Bose, B.,Gross, C.A.,Sauer, R.T.
      (2003) Cell 113: 61


    Organizational Affiliation

    Institute for Molecular Pathology (IMP), Dr. Bohrgasse 7, A-1030 Vienna, Austria.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Protease degS
A, B, C
320Escherichia coli (strain K12)Gene Names: degS (hhoB, htrH)
EC: 3.4.21.107
Find proteins for P0AEE3 (Escherichia coli (strain K12))
Go to UniProtKB:  P0AEE3
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B, C
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.198 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 207.681α = 90.00
b = 143.062β = 90.07
c = 41.529γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
CNSrefinement
DENZOdata reduction
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-06-08
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance