2R3U

Crystal structure of the PDZ deletion mutant of DegS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.198 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Regulation of the sigmaE stress response by DegS: how the PDZ domain keeps the protease inactive in the resting state and allows integration of different OMP-derived stress signals upon folding stress.

Hasselblatt, H.Kurzbauer, R.Wilken, C.Krojer, T.Sawa, J.Kurt, J.Kirk, R.Hasenbein, S.Ehrmann, M.Clausen, T.

(2007) Genes Dev. 21: 2659-2670

  • DOI: 10.1101/gad.445307
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The unfolded protein response of Escherichia coli is triggered by the accumulation of unassembled outer membrane proteins (OMPs) in the cellular envelope. The PDZ-protease DegS recognizes these mislocalized OMPs and initiates a proteolytic cascade th ...

    The unfolded protein response of Escherichia coli is triggered by the accumulation of unassembled outer membrane proteins (OMPs) in the cellular envelope. The PDZ-protease DegS recognizes these mislocalized OMPs and initiates a proteolytic cascade that ultimately leads to the sigmaE-driven expression of a variety of factors dealing with folding stress in the periplasm and OMP assembly. The general features of how OMPs activate the protease function of DegS have not yet been systematically addressed. Furthermore, it is unknown how the PDZ domain keeps the protease inactive in the resting state, which is of crucial importance for the functioning of the entire sigmaE stress response. Here we show in atomic detail how DegS is able to integrate the information of distinct stress signals that originate from different OMPs containing a -x-Phe C-terminal motif. A dedicated loop of the protease domain, loop L3, serves as a versatile sensor for allosteric ligands. L3 is capable of interacting differently with ligands but reorients in a conserved manner to activate DegS. Our data also indicate that the PDZ domain directly inhibits protease function in the absence of stress signals by wedging loop L3 in a conformation that ultimately disrupts the proteolytic site. Thus, the PDZ domain and loop L3 of DegS define a novel molecular switch allowing strict regulation of the sigmaE stress response system.


    Organizational Affiliation

    Research Institute of Molecular Pathology-IMP, A-1030 Vienna, Austria.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Protease degS
A, B, C
211Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: degS (hhoB, htrH)
EC: 3.4.21.107
Find proteins for P0AEE3 (Escherichia coli (strain K12))
Go to UniProtKB:  P0AEE3
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.198 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 113.847α = 90.00
b = 66.223β = 95.68
c = 84.508γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
MAR345dtbdata collection
SCALEPACKdata scaling
CNSrefinement
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-11-27
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance