model refined against symmetry-free cryo-EM map of TRiC-ADP

Experimental Data Snapshot

  • Resolution: 11.3 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report

This is version 1.4 of the entry. See complete history


Symmetry-Free Cryo-Em Structures of the Chaperonin Tric Along its ATPase-Driven Conformational Cycle.

Cong, Y.Schroder, G.F.Meyer, A.S.Jakana, J.Ma, B.Dougherty, M.T.Schmid, M.F.Reissmann, S.Levitt, M.Ludtke, S.L.Frydman, J.Chiu, W.

(2012) EMBO J 31: 720

  • DOI: https://doi.org/10.1038/emboj.2011.366
  • Primary Citation of Related Structures:  
    4A0O, 4A0V, 4A0W, 4A13

  • PubMed Abstract: 

    The eukaryotic group II chaperonin TRiC/CCT is a 16-subunit complex with eight distinct but similar subunits arranged in two stacked rings. Substrate folding inside the central chamber is triggered by ATP hydrolysis. We present five cryo-EM structures of TRiC in apo and nucleotide-induced states without imposing symmetry during the 3D reconstruction. These structures reveal the intra- and inter-ring subunit interaction pattern changes during the ATPase cycle. In the apo state, the subunit arrangement in each ring is highly asymmetric, whereas all nucleotide-containing states tend to be more symmetrical. We identify and structurally characterize an one-ring closed intermediate induced by ATP hydrolysis wherein the closed TRiC ring exhibits an observable chamber expansion. This likely represents the physiological substrate folding state. Our structural results suggest mechanisms for inter-ring-negative cooperativity, intra-ring-positive cooperativity, and protein-folding chamber closure of TRiC. Intriguingly, these mechanisms are different from other group I and II chaperonins despite their similar architecture.

  • Organizational Affiliation

    Verna and Marrs McLean Department of Biochemistry and Molecular Biology, National Center for Macromolecular Imaging, Baylor College of Medicine, Houston, TX 77030, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D, E
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P
513Bos taurusMutation(s): 0 
Gene Names: CCT2
Find proteins for Q3ZBH0 (Bos taurus)
Explore Q3ZBH0 
Go to UniProtKB:  Q3ZBH0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ3ZBH0
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 11.3 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-02-15
    Type: Initial release
  • Version 1.1: 2013-03-20
    Changes: Other
  • Version 1.2: 2013-05-29
    Changes: Structure summary
  • Version 1.3: 2017-04-19
    Changes: Other
  • Version 1.4: 2018-10-03
    Changes: Data collection