6TF9

Structure of the vertebrate gamma-Tubulin Ring Complex


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.80 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

Insights into the assembly and activation of the microtubule nucleator gamma-TuRC.

Liu, P.Zupa, E.Neuner, A.Bohler, A.Loerke, J.Flemming, D.Ruppert, T.Rudack, T.Peter, C.Spahn, C.Gruss, O.J.Pfeffer, S.Schiebel, E.

(2020) Nature 578: 467-471

  • DOI: 10.1038/s41586-019-1896-6
  • Primary Citation of Related Structures:  
    6TF9

  • PubMed Abstract: 
  • Microtubules are dynamic polymers of α- and β-tubulin and have crucial roles in cell signalling, cell migration, intracellular transport and chromosome segregation 1 . They assemble de novo from αβ-tubulin dimers in an essential process te ...

    Microtubules are dynamic polymers of α- and β-tubulin and have crucial roles in cell signalling, cell migration, intracellular transport and chromosome segregation 1 . They assemble de novo from αβ-tubulin dimers in an essential process termed microtubule nucleation. Complexes that contain the protein γ-tubulin serve as structural templates for the microtubule nucleation reaction 2 . In vertebrates, microtubules are nucleated by the 2.2-megadalton γ-tubulin ring complex (γ-TuRC), which comprises γ-tubulin, five related γ-tubulin complex proteins (GCP2-GCP6) and additional factors 3 . GCP6 is unique among the GCP proteins because it carries an extended insertion domain of unknown function. Our understanding of microtubule formation in cells and tissues is limited by a lack of high-resolution structural information on the γ-TuRC. Here we present the cryo-electron microscopy structure of γ-TuRC from Xenopus laevis at 4.8 Å global resolution, and identify a 14-spoked arrangement of GCP proteins and γ-tubulins in a partially flexible open left-handed spiral with a uniform sequence of GCP variants. By forming specific interactions with other GCP proteins, the GCP6-specific insertion domain acts as a scaffold for the assembly of the γ-TuRC. Unexpectedly, we identify actin as a bona fide structural component of the γ-TuRC with functional relevance in microtubule nucleation. The spiral geometry of γ-TuRC is suboptimal for microtubule nucleation and a controlled conformational rearrangement of the γ-TuRC is required for its activation. Collectively, our cryo-electron microscopy reconstructions provide detailed insights into the molecular organization, assembly and activation mechanism of vertebrate γ-TuRC, and will serve as a framework for the mechanistic understanding of fundamental biological processes associated with microtubule nucleation, such as meiotic and mitotic spindle formation and centriole biogenesis 4 .


    Organizational Affiliation

    Zentrum für Molekulare Biologie, Universität Heidelberg, DKFZ-ZMBH Allianz, Heidelberg, Germany. e.schiebel@zmbh.uni-heidelberg.de.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Helix 1AP129Xenopus laevisMutation(s): 0 
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Entity ID: 10
MoleculeChainsSequence LengthOrganismDetailsImage
Gamma-tubulin complex component 3 homologQP1cP1dP1eP1fP1906Xenopus laevisMutation(s): 0 
Gene Names: tubgcp3
Find proteins for O73787 (Xenopus laevis)
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Entity ID: 11
MoleculeChainsSequence LengthOrganismDetailsImage
Gamma-tubulin complex component 2RP1YP1ZP1aP1bP1896Xenopus laevisMutation(s): 0 
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Entity ID: 12
MoleculeChainsSequence LengthOrganismDetailsImage
Gamma tubulin ring proteinSP11625Xenopus laevisMutation(s): 0 
Gene Names: tubgcp6.Lgrip210tubgcp6
Find proteins for Q9DDA7 (Xenopus laevis)
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Entity ID: 13
MoleculeChainsSequence LengthOrganismDetailsImage
Tubulin gamma-1 chainTP1hP1iP1kP1lP1mP1nP1oP1pP1qP1rP1sP1tP1wP1451Xenopus laevisMutation(s): 0 
Gene Names: tubg1
Find proteins for P23330 (Xenopus laevis)
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Entity ID: 14
MoleculeChainsSequence LengthOrganismDetailsImage
Gamma-tubulin complex componentUP11019Xenopus laevisMutation(s): 0 
Gene Names: XELAEV_18013027mg
Find proteins for A0A1L8HGZ5 (Xenopus laevis)
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Entity ID: 15
MoleculeChainsSequence LengthOrganismDetailsImage
Gamma-tubulin complex componentVP1WP1666Xenopus laevisMutation(s): 0 
Gene Names: tubgcp4.LMGC81229tubgcp4
Find proteins for Q642S3 (Xenopus laevis)
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Entity ID: 16
MoleculeChainsSequence LengthOrganismDetailsImage
Belt helix 17gP119Xenopus laevisMutation(s): 0 
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Entity ID: 17
MoleculeChainsSequence LengthOrganismDetailsImage
Actin, cytoplasmic 1jP1375Xenopus laevisMutation(s): 0 
Gene Names: actb
Find proteins for O93400 (Xenopus laevis)
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Belt helices 1,2,3,4CP1HP1IP1XP113Xenopus laevisMutation(s): 0 
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Belt helix 5DP131Xenopus laevisMutation(s): 0 
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Belt helix 6EP123Xenopus laevisMutation(s): 0 
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
Belt helix 7FP118Xenopus laevisMutation(s): 0 
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
Belt helices 8,9,10GP1LP1NP115Xenopus laevisMutation(s): 0 
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Entity ID: 7
MoleculeChainsSequence LengthOrganismDetailsImage
Belt helices 11,12JP1vP114Xenopus laevisMutation(s): 0 
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Entity ID: 8
MoleculeChainsSequence LengthOrganismDetailsImage
Belt helices 13,14,15 and Helix 2KP1OP1PP1uP116Xenopus laevisMutation(s): 0 
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Entity ID: 9
MoleculeChainsSequence LengthOrganismDetailsImage
Belt helix 16MP117Xenopus laevisMutation(s): 0 
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.80 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

  • Deposited Date: 2019-11-13 
  • Released Date: 2019-12-11 
  • Deposition Author(s): Zupa, E., Pfeffer, S.

Revision History 

  • Version 1.0: 2019-12-11
    Type: Initial release
  • Version 1.1: 2020-01-01
    Changes: Database references
  • Version 1.2: 2020-03-04
    Changes: Database references