8Q62

Early closed conformation of the g-tubulin ring complex


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.72 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

Transition of human gamma-tubulin ring complex into a closed conformation during microtubule nucleation.

Brito, C.Serna, M.Guerra, P.Llorca, O.Surrey, T.

(2024) Science 383: 870-876

  • DOI: https://doi.org/10.1126/science.adk6160
  • Primary Citation of Related Structures:  
    8Q62

  • PubMed Abstract: 

    Microtubules are essential for intracellular organization and chromosome segregation. They are nucleated by the γ-tubulin ring complex (γTuRC). However, isolated vertebrate γTuRC adopts an open conformation that deviates from the microtubule structure, raising the question of the nucleation mechanism. In this study, we determined cryo-electron microscopy structures of human γTuRC bound to a nascent microtubule. Structural changes of the complex into a closed conformation ensure that γTuRC templates the 13-protofilament microtubules that exist in human cells. Closure is mediated by a latch that interacts with incorporating tubulin, making it part of the closing mechanism. Further rearrangements involve all γTuRC subunits and the removal of the actin-containing luminal bridge. Our proposed mechanism of microtubule nucleation by human γTuRC relies on large-scale structural changes that are likely the target of regulation in cells.


  • Organizational Affiliation

    Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Barcelona, Spain.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Tubulin gamma-1 chain451Homo sapiensMutation(s): 0 
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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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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Gamma-tubulin complex component 5B [auth J]1,024Homo sapiensMutation(s): 0 
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PHAROS:  Q96RT8
GTEx:  ENSG00000275835 
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UniProt GroupQ96RT8
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Gamma-tubulin complex component 4C [auth K],
K [auth I]
667Homo sapiensMutation(s): 0 
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PHAROS:  Q9UGJ1
GTEx:  ENSG00000137822 
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UniProt GroupQ9UGJ1
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Gamma-tubulin complex component 3D [auth B],
F [auth D],
H [auth F],
J [auth H],
N
907Homo sapiensMutation(s): 0 
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GTEx:  ENSG00000126216 
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
Gamma-tubulin complex component 2E [auth C],
G [auth E],
I [auth G],
M,
O [auth A]
902Homo sapiensMutation(s): 0 
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GTEx:  ENSG00000130640 
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
Gamma-tubulin complex component 61,819Homo sapiensMutation(s): 0 
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GTEx:  ENSG00000128159 
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.72 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTREFMAC5.8.0267

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Agencia Estatal de Investigacion (AEI)SpainAEI/10.13039/501100011 003
European Regional Development FundEuropean UnionPID2020-114429RB-I00

Revision History  (Full details and data files)

  • Version 1.0: 2024-02-07
    Type: Initial release
  • Version 1.1: 2024-02-14
    Changes: Database references
  • Version 1.2: 2024-03-06
    Changes: Database references