1A6D

THERMOSOME FROM T. ACIDOPHILUM

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.298 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.215 

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This is version 1.2 of the entry. See complete history. 


Literature

Crystal structure of the thermosome, the archaeal chaperonin and homolog of CCT.

Ditzel, L., Lowe, J., Stock, D., Stetter, K.O., Huber, H., Huber, R., Steinbacher, S.

(1998) Cell 93: 125-138

  • DOI: 10.1016/s0092-8674(00)81152-6
  • Primary Citation of Related Structures:  
    1A6D, 1A6E

  • PubMed Abstract: 

    • We have determined to 2.6 A resolution the crystal structure of the thermosome, the archaeal group II chaperonin from T. acidophilum. The hexadecameric homolog of the eukaryotic chaperonin CCT/TRiC shows an (alphabeta)4(alphabeta)4 subunit assembly. Domain folds are homologous to GroEL but form a novel type of inter-ring contact ...

    We have determined to 2.6 A resolution the crystal structure of the thermosome, the archaeal group II chaperonin from T. acidophilum. The hexadecameric homolog of the eukaryotic chaperonin CCT/TRiC shows an (alphabeta)4(alphabeta)4 subunit assembly. Domain folds are homologous to GroEL but form a novel type of inter-ring contact. The domain arrangement resembles the GroEL-GroES cis-ring. Parts of the apical domains form a lid creating a closed conformation. The lid substitutes for a GroES-like cochaperonin that is absent in the CCT/TRiC system. The central cavity has a polar surface implicated in protein folding. Binding of the transition state analog Mg-ADP-AIF3 suggests that the closed conformation corresponds to the ATP form.

    Organizational Affiliation: 

    Max-Planck-Institut für Biochemie, Martinsried, Germany.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
THERMOSOME (ALPHA SUBUNIT)A545Thermoplasma acidophilumMutation(s): 0 
UniProt
Find proteins for P48424 (Thermoplasma acidophilum (strain ATCC 25905 / DSM 1728 / JCM 9062 / NBRC 15155 / AMRC-C165))
Explore P48424 
Go to UniProtKB:  P48424
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP48424
Protein Feature View
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  • Reference Sequence
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
THERMOSOME (BETA SUBUNIT)B543Thermoplasma acidophilumMutation(s): 0 
UniProt
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
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.298 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.215 
  • Space Group: I 4 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 168.3α = 90
b = 168.3β = 90
c = 203.4γ = 90
Software Package:
Software NamePurpose
SHELX-96model building
X-PLORrefinement
MOSFLMdata reduction
CCP4data scaling
SHELX-96phasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-03-23
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance