6V6S

Structure of the native human gamma-tubulin ring complex


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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

  • 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 a ...

    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. Electronic address: kapoor@rockefeller.edu.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Gamma-tubulin complex component 2 ACEGM930Homo sapiensMutation(s): 0 
Gene Names: TUBGCP2GCP2
Find proteins for Q9BSJ2 (Homo sapiens)
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PHAROS:  Q9BSJ2
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Gamma-tubulin complex component 3 BDFHT907Homo sapiensMutation(s): 0 
Gene Names: TUBGCP3GCP3
Find proteins for Q96CW5 (Homo sapiens)
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PHAROS:  Q96CW5
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Gamma-tubulin complex component 4 IK667Homo sapiensMutation(s): 0 
Gene Names: TUBGCP476PGCP4
Find proteins for Q9UGJ1 (Homo sapiens)
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PHAROS:  Q9UGJ1
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Gamma-tubulin complex component 5 J1024Homo sapiensMutation(s): 0 
Gene Names: TUBGCP5GCP5KIAA1899
Find proteins for Q96RT8 (Homo sapiens)
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PHAROS:  Q96RT8
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
Gamma-tubulin complex component 6 L1819Homo sapiensMutation(s): 0 
Gene Names: TUBGCP6GCP6KIAA1669
Find proteins for Q96RT7 (Homo sapiens)
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
Unassigned poly-alanine chain ("staple") NOQRS50Homo sapiensMutation(s): 0 
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Entity ID: 7
MoleculeChainsSequence LengthOrganismDetailsImage
beta actin U374Homo sapiensMutation(s): 0 
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Entity ID: 8
MoleculeChainsSequence LengthOrganismDetailsImage
Unassigned poly-alanine model ("CC") VY66Homo sapiensMutation(s): 0 
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Entity ID: 9
MoleculeChainsSequence LengthOrganismDetailsImage
Unassigned poly-alanine model ("HB") W165Homo sapiensMutation(s): 0 
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Entity ID: 10
MoleculeChainsSequence LengthOrganismDetailsImage
Unassigned poly-alanine model ("Lumenal bridge helical bundles") X263Homo sapiensMutation(s): 0 
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Entity ID: 11
MoleculeChainsSequence LengthOrganismDetailsImage
Tubulin gamma-1 chainabcdefghabcdefghijklmt
451Homo sapiensMutation(s): 0 
Gene Names: TUBG1TUBG
Find proteins for P23258 (Homo sapiens)
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PHAROS:  P23258
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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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 

  • Version 1.0: 2020-01-01
    Type: Initial release
  • Version 1.1: 2020-01-22
    Changes: Database references