3GDV

Crystal structure of DegS H198P/D320A mutant modified by DFP and in complex with YQF peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.49 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.193 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

OMP peptides activate the DegS stress-sensor protease by a relief of inhibition mechanism.

Sohn, J.Grant, R.A.Sauer, R.T.

(2009) Structure 17: 1411-1421

  • DOI: 10.1016/j.str.2009.07.017
  • Primary Citation of Related Structures:  
    3GCO, 3GDS, 3GDU, 3GDV

  • PubMed Abstract: 
  • In the E. coli periplasm, C-terminal peptides of misfolded outer-membrane porins (OMPs) bind to the PDZ domains of the trimeric DegS protease, triggering cleavage of a transmembrane regulator and transcriptional activation of stress genes. We show that an active-site DegS mutation partially bypasses the requirement for peptide activation and acts synergistically with mutations that disrupt contacts between the protease and PDZ domains ...

    In the E. coli periplasm, C-terminal peptides of misfolded outer-membrane porins (OMPs) bind to the PDZ domains of the trimeric DegS protease, triggering cleavage of a transmembrane regulator and transcriptional activation of stress genes. We show that an active-site DegS mutation partially bypasses the requirement for peptide activation and acts synergistically with mutations that disrupt contacts between the protease and PDZ domains. Biochemical results support an allosteric model, in which these mutations, active-site modification, and peptide/substrate binding act in concert to stabilize proteolytically active DegS. Cocrystal structures of DegS in complex with different OMP peptides reveal activation of the protease domain with varied conformations of the PDZ domain and without specific contacts from the bound OMP peptide. Taken together, these results indicate that the binding of OMP peptides activates proteolysis principally by relieving inhibitory contacts between the PDZ domain and the protease domain of DegS.


    Organizational Affiliation

    Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DegS proteaseA, B, C340Escherichia coli K-12Mutation(s): 2 
Gene Names: b3235degShhoBhtrHJW3204
EC: 3.4.21 (PDB Primary Data), 3.4.21.107 (UniProt)
Find proteins for P0AEE3 (Escherichia coli (strain K12))
Explore P0AEE3 
Go to UniProtKB:  P0AEE3
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
YQF peptideD, E, F3N/AMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MIS
Query on MIS
A, B, CL-PEPTIDE LINKINGC6 H14 N O6 PSER
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.49 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.193 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 118.88α = 90
b = 172.278β = 90
c = 114.768γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
HKL-2000data collection

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-03-31
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2012-12-12
    Changes: Other
  • Version 1.3: 2013-03-13
    Changes: Other
  • Version 1.4: 2017-11-01
    Changes: Refinement description