Beta-apical domain of thermosome

Experimental Data Snapshot

  • Resolution: 2.80 Å
  • R-Value Free: 0.318 
  • R-Value Work: 0.261 
  • R-Value Observed: 0.261 

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This is version 1.4 of the entry. See complete history


Crystal Structure of the Beta-Apical Domain from Thermosome Reveals Structural Plasticity in Protrusion Region

Bosch, G.Baumeister, W.Essen, L.-O.

(2000) J Mol Biol 301: 19

  • DOI: https://doi.org/10.1006/jmbi.2000.3955
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The crystal structure of the beta-apical domain of the thermosome, an archaeal group II chaperonin from Thermoplasma acidophilum, has been determined at 2.8 A resolution. The structure shows an invariant globular core from which a 25 A long protrusion emanates, composed of an elongated alpha-helix (H10) and a long extended stretch consisting of residues GluB245-ThrB253. A comparison with previous apical domain structures reveals a large segmental displacement of the protruding part of helix H10 via the hinge GluB276-ValB278. The region comprising residues GluB245-ThrB253 adopts an extended beta-like conformation rather than the alpha-helix seen in the alpha-apical domain. Consequently, it appears that the protrusions of the apical domains from group II chaperonins might assume a variety of context-dependent conformations during an open, substrate-accepting state of the chaperonin. Sequence variations in the protrusion regions that are found in the eukaryotic TRiC/CCT subunits may provide different structural propensities and hence serve different roles in substrate recognition.

  • Organizational Affiliation

    Max-Planck-Institute for Biochemistry, Am Klopferspitz 18a, Martinsried bei München, D-82152, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
THERMOSOMEA [auth B]159Thermoplasma acidophilumMutation(s): 3 
Find proteins for P48425 (Thermoplasma acidophilum (strain ATCC 25905 / DSM 1728 / JCM 9062 / NBRC 15155 / AMRC-C165))
Explore P48425 
Go to UniProtKB:  P48425
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP48425
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.80 Å
  • R-Value Free: 0.318 
  • R-Value Work: 0.261 
  • R-Value Observed: 0.261 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.32α = 90
b = 57.32β = 90
c = 106.14γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-08-19
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2019-07-24
    Changes: Data collection
  • Version 1.4: 2023-12-06
    Changes: Data collection, Database references, Other, Refinement description