2YEY

Crystal structure of the allosteric-defective chaperonin GroEL E434K mutant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.5 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.167 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Crystal Structure of the Temperature-Sensitive and Allosteric-Defective Chaperonin Groele461K.

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

(2006) J.Struct.Biol. 155: 482

  • DOI: 10.1016/j.jsb.2006.06.008
  • Primary Citation of Related Structures:  2EU1

  • 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 ring ...

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
60 KDA CHAPERONIN
A, B, C, D, E, F, G, H, I, J, K, L, M, N
524Escherichia coli (strain K12)Gene Names: groL (groEL, mopA)
Find proteins for P0A6F5 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A6F5
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.5 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.167 
  • Space Group: P 32
Unit Cell:
Length (Å)Angle (°)
a = 171.908α = 90.00
b = 171.908β = 90.00
c = 454.592γ = 120.00
Software Package:
Software NamePurpose
PHASERphasing
MOSFLMdata reduction
SCALAdata scaling
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-05-18
    Type: Initial release
  • Version 1.1: 2014-02-05
    Type: Database references, Other, Structure summary, Version format compliance