6V69

Structures of GCP4 and GCP5 in the native human gamma-tubulin ring complex


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Asymmetric Molecular Architecture of the Human gamma-Tubulin Ring Complex.

Wieczorek, M.Urnavicius, L.Ti, S.C.Molloy, K.R.Chait, B.T.Kapoor, T.M.

(2020) Cell 180: 165-175.e16

  • DOI: https://doi.org/10.1016/j.cell.2019.12.007
  • Primary Citation of Related Structures:  
    6V5V, 6V69, 6V6B, 6V6C, 6V6S

  • PubMed Abstract: 

    The γ-tubulin ring complex (γ-TuRC) is an essential regulator of centrosomal and acentrosomal microtubule formation, yet its structure is not known. Here, we present a cryo-EM reconstruction of the native human γ-TuRC at ∼3.8 Å resolution, revealing an asymmetric, cone-shaped structure. Pseudo-atomic models indicate that GCP4, GCP5, and GCP6 form distinct Y-shaped assemblies that structurally mimic GCP2/GCP3 subcomplexes distal to the γ-TuRC "seam." We also identify an unanticipated structural bridge that includes an actin-like protein and spans the γ-TuRC lumen. Despite its asymmetric architecture, the γ-TuRC arranges γ-tubulins into a helical geometry poised to nucleate microtubules. Diversity in the γ-TuRC subunits introduces large (>100,000 Å 2 ) surfaces in the complex that allow for interactions with different regulatory factors. The observed compositional complexity of the γ-TuRC could self-regulate its assembly into a cone-shaped structure to control microtubule formation across diverse contexts, e.g., within biological condensates or alongside existing filaments.


  • Organizational Affiliation

    Laboratory of Chemistry and Cell Biology, The Rockefeller University, 1230 York Avenue, New York, NY 10065, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Gamma-tubulin complex component 5A [auth J]1,024Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for Q96RT8 (Homo sapiens)
Explore Q96RT8 
Go to UniProtKB:  Q96RT8
PHAROS:  Q96RT8
GTEx:  ENSG00000275835 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ96RT8
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Gamma-tubulin complex component 4B [auth I]667Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for Q9UGJ1 (Homo sapiens)
Explore Q9UGJ1 
Go to UniProtKB:  Q9UGJ1
PHAROS:  Q9UGJ1
GTEx:  ENSG00000137822 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9UGJ1
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR35 GM130234
Human Frontier Science Program (HFSP)FranceLT000025/18-L1

Revision History  (Full details and data files)

  • Version 1.0: 2020-01-01
    Type: Initial release
  • Version 1.1: 2020-01-22
    Changes: Database references
  • Version 1.2: 2024-03-06
    Changes: Data collection, Database references