7QJ8

Structure of recombinant human gamma-Tubulin Ring Complex 12-spoked assembly intermediate (spokes 3-14, substoichiometric spokes 1-2)


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 8.70 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Starting Models: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Modular assembly of the principal microtubule nucleator gamma-TuRC.

Wurtz, M.Zupa, E.Atorino, E.S.Neuner, A.Bohler, A.Rahadian, A.S.Vermeulen, B.J.A.Tonon, G.Eustermann, S.Schiebel, E.Pfeffer, S.

(2022) Nat Commun 13: 473-473

  • DOI: https://doi.org/10.1038/s41467-022-28079-0
  • Primary Citation of Related Structures:  
    7QJ0, 7QJ1, 7QJ2, 7QJ3, 7QJ4, 7QJ5, 7QJ6, 7QJ7, 7QJ8, 7QJ9, 7QJA, 7QJB, 7QJC, 7QJD, 7QJE

  • PubMed Abstract: 

    The gamma-tubulin ring complex (γ-TuRC) is the principal microtubule nucleation template in vertebrates. Recent cryo-EM reconstructions visualized the intricate quaternary structure of the γ-TuRC, containing more than thirty subunits, raising fundamental questions about γ-TuRC assembly and the role of actin as an integral part of the complex. Here, we reveal the structural mechanism underlying modular γ-TuRC assembly and identify a functional role of actin in microtubule nucleation. During γ-TuRC assembly, a GCP6-stabilized core comprising GCP2-3-4-5-4-6 is expanded by stepwise recruitment, selective stabilization and conformational locking of four pre-formed GCP2-GCP3 units. Formation of the lumenal bridge specifies incorporation of the terminal GCP2-GCP3 unit and thereby leads to closure of the γ-TuRC ring in a left-handed spiral configuration. Actin incorporation into the complex is not relevant for γ-TuRC assembly and structural integrity, but determines γ-TuRC geometry and is required for efficient microtubule nucleation and mitotic chromosome alignment in vivo.


  • Organizational Affiliation

    Zentrum für Molekulare Biologie der Universität Heidelberg, DKFZ-ZMBH Allianz, Im Neuenheimer Feld 282, 69120, Heidelberg, Germany.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Gamma-tubulin complex component 5A [auth l],
N [auth J]
1,024Homo sapiensMutation(s): 0 
Gene Names: TUBGCP5GCP5KIAA1899
UniProt & NIH Common Fund Data Resources
Find proteins for Q96RT8 (Homo sapiens)
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Go to UniProtKB:  Q96RT8
PHAROS:  Q96RT8
GTEx:  ENSG00000275835 
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UniProt GroupQ96RT8
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Tubulin gamma-1 chain451Homo sapiensMutation(s): 0 
Gene Names: TUBG1TUBG
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Find proteins for P23258 (Homo sapiens)
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PHAROS:  P23258
GTEx:  ENSG00000131462 
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UniProt GroupP23258
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
actin, cytoplasmic 1D [auth e]375Homo sapiensMutation(s): 0 
Gene Names: ACTB
UniProt
Find proteins for A0A6I9HGD1 (Geospiza fortis)
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UniProt GroupA0A6I9HGD1
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Mitotic-spindle organizing protein 1E [auth b],
EA [auth m],
GA [auth d],
S [auth i],
T [auth k]
82Homo sapiensMutation(s): 0 
Gene Names: MZT1C13orf37MOZART1
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GTEx:  ENSG00000204899 
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
Gamma-tubulin complex component 3907Homo sapiensMutation(s): 0 
Gene Names: TUBGCP3GCP3
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GTEx:  ENSG00000126216 
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
Gamma-tubulin complex component 2G [auth C],
I [auth E],
K [auth G],
Q [auth M]
902Homo sapiensMutation(s): 0 
Gene Names: TUBGCP2GCP2
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PHAROS:  Q9BSJ2
GTEx:  ENSG00000130640 
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UniProt GroupQ9BSJ2
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Entity ID: 7
MoleculeChains Sequence LengthOrganismDetailsImage
Gamma-tubulin complex component 4M [auth I],
O [auth K]
667Homo sapiensMutation(s): 0 
Gene Names: TUBGCP476PGCP4
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GTEx:  ENSG00000137822 
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Entity ID: 8
MoleculeChains Sequence LengthOrganismDetailsImage
Gamma-tubulin complex component 6HA [auth c],
P [auth L]
1,819Homo sapiensMutation(s): 0 
Gene Names: TUBGCP6GCP6KIAA1669
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GTEx:  ENSG00000128159 
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UniProt GroupQ96RT7
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 8.70 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTPHENIX
RECONSTRUCTIONRELION3.0

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
German Research Foundation (DFG)GermanyPF 963/1-4
German Research Foundation (DFG)GermanySchi 295/4-4

Revision History  (Full details and data files)

  • Version 1.0: 2022-01-26
    Type: Initial release
  • Version 1.1: 2022-02-09
    Changes: Database references
  • Version 1.2: 2024-07-17
    Changes: Data collection, Refinement description