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- PDB-8qv2: Structure of the native y-Tubulin Ring Complex (yTuRC) capping mi... -
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Open data
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Basic information
Entry | Database: PDB / ID: 8qv2 | ||||||||||||
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Title | Structure of the native y-Tubulin Ring Complex (yTuRC) capping microtubule minus ends at the spindle pole body | ||||||||||||
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![]() | CELL CYCLE / Microtubule nucleation / MTOC / y-tubulin / SPB | ||||||||||||
Function / homology | ![]() nuclear migration by microtubule mediated pushing forces / microtubule minus-end binding / nuclear division / equatorial microtubule organizing center / mitotic spindle pole body / nuclear migration along microtubule / homologous chromosome segregation / Platelet degranulation / gamma-tubulin complex / meiotic spindle organization ...nuclear migration by microtubule mediated pushing forces / microtubule minus-end binding / nuclear division / equatorial microtubule organizing center / mitotic spindle pole body / nuclear migration along microtubule / homologous chromosome segregation / Platelet degranulation / gamma-tubulin complex / meiotic spindle organization / microtubule nucleation / gamma-tubulin binding / spindle pole body / tubulin complex / mitotic sister chromatid segregation / spindle assembly / cytoplasmic microtubule organization / mitotic spindle organization / nuclear periphery / meiotic cell cycle / Hydrolases; Acting on acid anhydrides; Acting on GTP to facilitate cellular and subcellular movement / structural constituent of cytoskeleton / spindle pole / microtubule cytoskeleton organization / spindle / mitotic cell cycle / microtubule / hydrolase activity / GTPase activity / GTP binding / nucleus / metal ion binding / cytoplasm Similarity search - Function | ||||||||||||
Biological species | ![]() ![]() | ||||||||||||
Method | ELECTRON MICROSCOPY / subtomogram averaging / cryo EM / Resolution: 9.2 Å | ||||||||||||
![]() | Dendooven, T. / Yatskevich, S. / Burt, A. / Bellini, D. / Kilmartin, J. / Barford, D. | ||||||||||||
Funding support | ![]() ![]()
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![]() | ![]() Title: Structure of the native γ-tubulin ring complex capping spindle microtubules. Authors: Tom Dendooven / Stanislau Yatskevich / Alister Burt / Zhuo A Chen / Dom Bellini / Juri Rappsilber / John V Kilmartin / David Barford / ![]() ![]() ![]() Abstract: Microtubule (MT) filaments, composed of α/β-tubulin dimers, are fundamental to cellular architecture, function and organismal development. They are nucleated from MT organizing centers by the ...Microtubule (MT) filaments, composed of α/β-tubulin dimers, are fundamental to cellular architecture, function and organismal development. They are nucleated from MT organizing centers by the evolutionarily conserved γ-tubulin ring complex (γTuRC). However, the molecular mechanism of nucleation remains elusive. Here we used cryo-electron tomography to determine the structure of the native γTuRC capping the minus end of a MT in the context of enriched budding yeast spindles. In our structure, γTuRC presents a ring of γ-tubulin subunits to seed nucleation of exclusively 13-protofilament MTs, adopting an active closed conformation to function as a perfect geometric template for MT nucleation. Our cryo-electron tomography reconstruction revealed that a coiled-coil protein staples the first row of α/β-tubulin of the MT to alternating positions along the γ-tubulin ring of γTuRC. This positioning of α/β-tubulin onto γTuRC suggests a role for the coiled-coil protein in augmenting γTuRC-mediated MT nucleation. Based on our results, we describe a molecular model for budding yeast γTuRC activation and MT nucleation. | ||||||||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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PDBx/mmCIF format | ![]() | 5.5 MB | Display | ![]() |
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-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 18665MC ![]() 8qv0C ![]() 8qv3C M: map data used to model this data C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
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Assembly
Deposited unit | ![]()
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Components
-Protein , 4 types, 62 molecules bcdefghijklmnaAdAcAfAeAhAgAjAiAlAkAnAmAbApAoAr...
#1: Protein | Mass: 52671.188 Da / Num. of mol.: 14 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() #4: Protein | Mass: 49853.867 Da / Num. of mol.: 17 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() #5: Protein | Mass: 50967.457 Da / Num. of mol.: 17 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() #7: Protein | Mass: 5720.042 Da / Num. of mol.: 14 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
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-Spindle pole body ... , 3 types, 28 molecules CEGIKMODFHJLNPScSdSeSfSgShSiSjSkSlSaSbSmSn
#2: Protein | Mass: 96940.594 Da / Num. of mol.: 7 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() #3: Protein | Mass: 98336.211 Da / Num. of mol.: 7 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() #6: Protein | Mass: 111987.125 Da / Num. of mol.: 14 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
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-Non-polymers , 3 types, 21 molecules ![](data/chem/img/GTP.gif)
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#8: Chemical | ChemComp-GTP / #9: Chemical | ChemComp-GDP / | #10: Water | ChemComp-HOH / | |
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-Details
Has ligand of interest | N |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: subtomogram averaging |
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Sample preparation
Component | Name: y-Tubulin Ring Complex capping the microtubule minus end Type: ORGANELLE OR CELLULAR COMPONENT / Entity ID: #1-#7 / Source: NATURAL |
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Molecular weight | Experimental value: NO |
Source (natural) | Organism: ![]() ![]() |
Buffer solution | pH: 6.53 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal defocus max: 4500 nm / Nominal defocus min: 2000 nm / C2 aperture diameter: 50 µm |
Image recording | Electron dose: 3 e/Å2 / Avg electron dose per subtomogram: 123 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) |
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Processing
EM software | Name: PHENIX / Version: 1.17.1_3660: / Category: model refinement | ||||||||||||||||||||||||
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
Symmetry | Point symmetry: C1 (asymmetric) | ||||||||||||||||||||||||
3D reconstruction | Resolution: 9.2 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 7910 / Symmetry type: POINT | ||||||||||||||||||||||||
EM volume selection | Num. of tomograms: 364 / Num. of volumes extracted: 31720 | ||||||||||||||||||||||||
Refine LS restraints |
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