2EU1

Crystal structure of the chaperonin GroEL-E461K


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.29 Å
  • R-Value Free: 0.296 
  • R-Value Work: 0.276 
  • R-Value Observed: 0.276 

Starting Model: experimental
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This is version 1.5 of the entry. See complete history


Literature

Crystal structure of the temperature-sensitive and allosteric-defective chaperonin GroEL(E461K).

Cabo-Bilbao, A.Spinelli, S.Sot, B.Agirre, J.Mechaly, A.E.Muga, A.Guerin, D.M.A.

(2006) J Struct Biol 155: 482-492

  • DOI: https://doi.org/10.1016/j.jsb.2006.06.008
  • Primary Citation of Related Structures:  
    2EU1, 2YEY

  • PubMed Abstract: 

    The chaperonin GroEL adopts a double-ring structure with various modes of allosteric communication. The simultaneous positive intra-ring and negative inter-ring co-operativities alternate the functionality of the folding cavities in both protein rings. Negative inter-ring co-operativity is maintained through different inter-ring interactions, including a salt bridge involving Glu 461. Replacement of this residue by Lys modifies the temperature sensitivity of the substrate-folding activity of this protein, most likely as a result of the loss of inter-ring co-operativity. The crystal structure of the mutant chaperonin GroELE461K has been determined at 3.3A and compared with other structures: the wild-type GroEL, an allosteric defective GroEL double mutant and the GroEL-GroES-(ADP)7 complex. The inter-ring region of the mutant exhibits the following characteristics: (i) no salt-bridge stabilizes the inter-ring interface; (ii) the mutated residue plays a central role in defining the relative ring rotation (of about 22 degrees) around the 7-fold axis; (iii) an increase in the inter-ring distance and solvent accessibility of the inter-ring interface; and (iv) a 2-fold reduction in the stabilization energy of the inter-ring interface, due to the modification of inter-ring interactions. These characteristics explain how the thermal sensitivity of the protein's fundamental properties permits GroEL to distinguish physiological (37 degrees C) from stress (42 degrees C) temperatures.


  • Organizational Affiliation

    Unidad de Biofísica (CSIC-UPV/EHU), P.O. Box 644, E-48080 Bilbao, Spain.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
GROEL
A, B, C, D, E
A, B, C, D, E, F, G, H, I, J, K, L, M, N
548Escherichia coliMutation(s): 1 
EC: 5.6.1.7
UniProt
Find proteins for P0A6F5 (Escherichia coli (strain K12))
Explore P0A6F5 
Go to UniProtKB:  P0A6F5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A6F5
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.29 Å
  • R-Value Free: 0.296 
  • R-Value Work: 0.276 
  • R-Value Observed: 0.276 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 267.695α = 90
b = 290.641β = 90
c = 247.006γ = 90
Software Package:
Software NamePurpose
SCALAdata scaling
AMoREphasing
CNSrefinement
CCP4data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-08-29
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2018-01-31
    Changes: Database references
  • Version 1.4: 2021-10-20
    Changes: Database references
  • Version 1.5: 2023-08-23
    Changes: Data collection, Refinement description