Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 8-mer - A1B1C1D1E1F1G1H1 Pseudo Symmetry: Cyclic - C8  (3D View)
Pseudo Stoichiometry: Homo 8-mer - A8 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 451.95 kDa 
• Atom Count: 4134 
• Modelled Residue Count: 4134 
• Deposited Residue Count: 4134 
• Unique protein chains: 8

3IYG

Ca model of bovine TRiC/CCT derived from a 4.0 Angstrom cryo-EM map

• PDB DOI: 10.2210/pdb3IYG/pdb
• EM Map EMD-5148: EMDB EMDataResource

• Classification: CHAPERONE
• Organism(s): Bos taurus
• Mutation(s): No 


• Deposited: 2009-11-28 Released: 2010-03-16 
• Deposition Author(s): Cong, Y., Baker, M.L., Ludtke, S.J., Frydman, J., Chiu, W.

---

Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 4.00 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

4.0-A resolution cryo-EM structure of the mammalian chaperonin TRiC/CCT reveals its unique subunit arrangement.

Cong, Y., Baker, M.L., Jakana, J., Woolford, D., Miller, E.J., Reissmann, S., Kumar, R.N., Redding-Johanson, A.M., Batth, T.S., Mukhopadhyay, A., Ludtke, S.J., Frydman, J., Chiu, W.

(2010) Proc Natl Acad Sci U S A 107: 4967-4972

• PubMed: 20194787 
• DOI: 10.1073/pnas.0913774107
• Primary Citation of Related Structures:  
  3IYG, 3KTT


• PubMed Abstract: 
  

The essential double-ring eukaryotic chaperonin TRiC/CCT (TCP1-ring complex or chaperonin containing TCP1) assists the folding of approximately 5-10% of the cellular proteome. Many TRiC substrates cannot be folded by other chaperonins from prokaryotes or archaea. These unique folding properties are likely linked to TRiC's unique heterooligomeric subunit organization, whereby each ring consists of eight different paralogous subunits in an arrangement that remains uncertain. Using single particle cryo-EM without imposing symmetry, we determined the mammalian TRiC structure at 4.7-A resolution. This revealed the existence of a 2-fold axis between its two rings resulting in two homotypic subunit interactions across the rings. A subsequent 2-fold symmetrized map yielded a 4.0-A resolution structure that evinces the densities of a large fraction of side chains, loops, and insertions. These features permitted unambiguous identification of all eight individual subunits, despite their sequence similarity. Independent biochemical near-neighbor analysis supports our cryo-EM derived TRiC subunit arrangement. We obtained a Calpha backbone model for each subunit from an initial homology model refined against the cryo-EM density. A subsequently optimized atomic model for a subunit showed approximately 95% of the main chain dihedral angles in the allowable regions of the Ramachandran plot. The determination of the TRiC subunit arrangement opens the way to understand its unique function and mechanism. In particular, an unevenly distributed positively charged wall lining the closed folding chamber of TRiC differs strikingly from that of prokaryotic and archaeal chaperonins. These interior surface chemical properties likely play an important role in TRiC's cellular substrate specificity.

---

Organizational Affiliation: 

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

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
T-complex protein 1 subunit theta	A [auth Q]	512	Bos taurus	Mutation(s): 0  Gene Names: CCT8
UniProt
Find proteins for Q3ZCI9 (Bos taurus) Explore Q3ZCI9  Go to UniProtKB:  Q3ZCI9

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
T-complex protein 1 subunit gamma	B [auth G]	515	Bos taurus	Mutation(s): 0  Gene Names: CCT3
UniProt
Find proteins for Q3T0K2 (Bos taurus) Explore Q3T0K2  Go to UniProtKB:  Q3T0K2

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
T-complex protein 1 subunit zeta	C [auth Z]	517	Bos taurus	Mutation(s): 0  Gene Names: CCT6A
UniProt
Find proteins for Q3MHL7 (Bos taurus) Explore Q3MHL7  Go to UniProtKB:  Q3MHL7

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details	Image
T-complex protein 1 subunit delta	D	518	Bos taurus	Mutation(s): 0  Gene Names: CCT4
UniProt
Find proteins for Q2T9X2 (Bos taurus) Explore Q2T9X2  Go to UniProtKB:  Q2T9X2

Entity ID: 5
Molecule	Chains	Sequence Length	Organism	Details	Image
T-complex protein 1 subunit beta	E [auth B]	513	Bos taurus	Mutation(s): 0  Gene Names: CCT2
UniProt
Find proteins for Q3ZBH0 (Bos taurus) Explore Q3ZBH0  Go to UniProtKB:  Q3ZBH0

Entity ID: 6
Molecule	Chains	Sequence Length	Organism	Details	Image
T-complex protein 1 subunit	F [auth E]	515	Bos taurus	Mutation(s): 0

Entity ID: 7
Molecule	Chains	Sequence Length	Organism	Details	Image
T-complex protein 1 subunit alpha	G [auth A]	529	Bos taurus	Mutation(s): 0  Gene Names: TCP1, CCT1
UniProt
Find proteins for Q32L40 (Bos taurus) Explore Q32L40  Go to UniProtKB:  Q32L40

Entity ID: 8
Molecule	Chains	Sequence Length	Organism	Details	Image
T-complex protein 1 subunit eta	H	515	Bos taurus	Mutation(s): 0  Gene Names: CCT7
UniProt
Find proteins for Q2NKZ1 (Bos taurus) Explore Q2NKZ1  Go to UniProtKB:  Q2NKZ1

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 4.00 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2009-11-28 
• Released Date: 2010-03-16 
Deposition Author(s): Cong, Y., Baker, M.L., Ludtke, S.J., Frydman, J., Chiu, W.

Revision History  

• Version 1.0: 2010-03-16
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2018-07-18
  Changes: Data collection