4B2T

The crystal structures of the eukaryotic chaperonin CCT reveal its functional partitioning


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 5.50 Å
  • R-Value Free: 0.399 
  • R-Value Work: 0.340 
  • R-Value Observed: 0.340 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Re-refinement Note

This entry reflects an alternative modeling of the original data in:2XSM


Literature

The Crystal Structures of the Eukaryotic Chaperonin Cct Reveal its Functional Partitioning

Kalisman, N.Schroder, G.F.Levitt, M.

(2013) Structure 21: 540

  • DOI: 10.1016/j.str.2013.01.017
  • Primary Citation of Related Structures:  
    4V8R, 4B2T

  • PubMed Abstract: 
  • In eukaryotes, CCT is essential for the correct and efficient folding of many cytosolic proteins, most notably actin and tubulin. Structural studies of CCT have been hindered by the failure of standard crystallographic analysis to resolve its eight d ...

    In eukaryotes, CCT is essential for the correct and efficient folding of many cytosolic proteins, most notably actin and tubulin. Structural studies of CCT have been hindered by the failure of standard crystallographic analysis to resolve its eight different subunit types at low resolutions. Here, we exhaustively assess the R value fit of all possible CCT models to available crystallographic data of the closed and open forms with resolutions of 3.8 Å and 5.5 Å, respectively. This unbiased analysis finds the native subunit arrangements with overwhelming significance. The resulting structures provide independent crystallographic proof of the subunit arrangement of CCT and map major asymmetrical features of the particle onto specific subunits. The actin and tubulin substrates both bind around subunit CCT6, which shows other structural anomalies. CCT is thus clearly partitioned, both functionally and evolutionary, into a substrate-binding side that is opposite to the ATP-hydrolyzing side.


    Related Citations: 
    • Crystal Structure of the Open Conformation of the Mammalian Chaperonin Cct in Complex with Tubulin.
      Munoz, I.G., Yebenes, H., Zhou, M., Mesa, P., Serna, M., Park, A.Y., Bragado-Nilsson, E., Beloso, A., De Carcer, G., Malumbres, M., Robinson, C.V., Valpuesta, J.M., Montoya, G.
      (2011) Nat Struct Mol Biol 18: 14

    Organizational Affiliation

    Department of Structural Biology, Stanford University School of Medicine, Stanford, CA 94305, USA.



Macromolecules
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
T-COMPLEX PROTEIN 1 SUBUNIT ETAHh543Bos taurusMutation(s): 0 
Gene Names: CCT7
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  • Reference Sequence
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Entity ID: 7
MoleculeChainsSequence LengthOrganismDetailsImage
T-COMPLEX PROTEIN 1 SUBUNIT THETAQq548Bos taurusMutation(s): 0 
Gene Names: CCT8
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
T-COMPLEX PROTEIN 1 SUBUNIT ALPHAAa556Bos taurusMutation(s): 0 
Gene Names: TCP1CCT1
Find proteins for Q32L40 (Bos taurus)
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
T-COMPLEX PROTEIN 1 SUBUNIT BETABb535Bos taurusMutation(s): 0 
Gene Names: CCT2
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
T-COMPLEX PROTEIN 1 SUBUNIT DELTADd542Bos taurusMutation(s): 0 
Gene Names: CCT4
Find proteins for Q2T9X2 (Bos taurus)
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
T-COMPLEX PROTEIN 1 SUBUNIT EPSILONEe541Bos taurusMutation(s): 0 
Gene Names: CCT5
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
T-COMPLEX PROTEIN 1 SUBUNIT GAMMAGg545Bos taurusMutation(s): 0 
Gene Names: CCT3
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Entity ID: 8
MoleculeChainsSequence LengthOrganismDetailsImage
T-COMPLEX PROTEIN 1 SUBUNIT ZETAZz531Bos taurusMutation(s): 0 
Gene Names: CCT6A
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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 5.50 Å
  • R-Value Free: 0.399 
  • R-Value Work: 0.340 
  • R-Value Observed: 0.340 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 272.7α = 90
b = 313.5β = 90
c = 158.3γ = 90
Software Package:
Software NamePurpose
CNSrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-03-20
    Type: Initial release
  • Version 1.1: 2013-04-03
    Changes: Database references
  • Version 1.2: 2013-04-17
    Changes: Database references
  • Version 1.3: 2013-06-05
    Changes: Other, Structure summary
  • Version 1.4: 2019-11-06
    Changes: Data collection, Database references, Other