4A8C

Symmetrized cryo-EM reconstruction of E. coli DegQ 12-mer in complex with a binding peptide


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 7.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Newly Folded Substrates Inside the Molecular Cage of the Htra Chaperone Degq

Malet, H.Canellas, F.Sawa, J.Yan, J.Thalassinos, K.Ehrmann, M.Clausen, T.Saibil, H.R.

(2012) Nat Struct Mol Biol 19: 152

  • DOI: 10.1038/nsmb.2210
  • Primary Citation of Related Structures:  
    4A8C, 4A8D, 4A8A, 4A8B, 4A9G

  • PubMed Abstract: 
  • The HtrA protein family combines chaperone and protease activities and is essential for protein quality control in many organisms. Whereas the mechanisms underlying the proteolytic function of HtrA proteins are well characterized, their chaperone act ...

    The HtrA protein family combines chaperone and protease activities and is essential for protein quality control in many organisms. Whereas the mechanisms underlying the proteolytic function of HtrA proteins are well characterized, their chaperone activity remains poorly understood. Here we describe cryo-EM structures of Escherichia coli DegQ in its 12- and 24-mer states in complex with model substrates, providing a structural model of HtrA chaperone action. Up to six lysozyme substrates bind inside the DegQ 12-mer cage and are visualized in a close-to-native state. An asymmetric reconstruction reveals the binding of a well-ordered lysozyme to four DegQ protomers. DegQ PDZ domains are located adjacent to substrate density and their presence is required for chaperone activity. The substrate-interacting regions appear conserved in 12- and 24-mer cages, suggesting a common mechanism of chaperone function.


    Organizational Affiliation

    Institute of Structural and Molecular Biology, Crystallography, Birkbeck College, London, UK.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PERIPLASMIC PH-DEPENDENT SERINE ENDOPROTEASE DEGQABCDEFGHIJKL436Escherichia coli K-12Mutation(s): 1 
Gene Names: degQhhoAb3234JW3203
EC: 3.4.21.107
Find proteins for P39099 (Escherichia coli (strain K12))
Explore P39099 
Go to UniProtKB:  P39099
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 7.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-01-11
    Type: Initial release
  • Version 1.1: 2012-02-15
    Changes: Other
  • Version 1.2: 2017-08-30
    Changes: Data collection, Refinement description