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Open data
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Basic information
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Title | CryoEM structure of the gTuRC-CM1dim complex | |||||||||
![]() | 3D Refinement map of the gTuRC-CM1dim complex | |||||||||
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![]() | gTuRC / gTuSC / CM1 / CDK5RAP2 / gamma-tubulin / microtubule / alfa/beta-tubulin nucleation / cytoskeleton / STRUCTURAL PROTEIN | |||||||||
Function / homology | ![]() microtubule nucleation by interphase microtubule organizing center / gamma-tubulin complex localization / microtubule nucleator activity / polar microtubule / interphase microtubule organizing center / gamma-tubulin complex / gamma-tubulin ring complex / mitotic spindle microtubule / meiotic spindle organization / microtubule nucleation ...microtubule nucleation by interphase microtubule organizing center / gamma-tubulin complex localization / microtubule nucleator activity / polar microtubule / interphase microtubule organizing center / gamma-tubulin complex / gamma-tubulin ring complex / mitotic spindle microtubule / meiotic spindle organization / microtubule nucleation / gamma-tubulin binding / non-motile cilium / pericentriolar material / cell leading edge / microtubule organizing center / mitotic sister chromatid segregation / single fertilization / mitotic spindle assembly / cytoplasmic microtubule / spindle assembly / cytoplasmic microtubule organization / centriole / Loss of Nlp from mitotic centrosomes / Loss of proteins required for interphase microtubule organization from the centrosome / Recruitment of mitotic centrosome proteins and complexes / Recruitment of NuMA to mitotic centrosomes / Anchoring of the basal body to the plasma membrane / AURKA Activation by TPX2 / condensed nuclear chromosome / mitotic spindle organization / meiotic cell cycle / brain development / recycling endosome / structural constituent of cytoskeleton / microtubule cytoskeleton organization / spindle / neuron migration / spindle pole / apical part of cell / Regulation of PLK1 Activity at G2/M Transition / mitotic cell cycle / microtubule cytoskeleton / protein-containing complex assembly / microtubule binding / microtubule / neuron projection / ciliary basal body / cilium / centrosome / GTP binding / structural molecule activity / nucleoplasm / identical protein binding / nucleus / membrane / cytosol / cytoplasm Similarity search - Function | |||||||||
Biological species | ![]() ![]() ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.57 Å | |||||||||
![]() | Llorca O / Serna M / Gonzalez-Rodriguez N | |||||||||
Funding support | ![]()
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![]() | ![]() Title: CDK5RAP2 activates microtubule nucleator γTuRC by facilitating template formation and actin release. Authors: Marina Serna / Fabian Zimmermann / Chithran Vineethakumari / Nayim Gonzalez-Rodriguez / Oscar Llorca / Jens Lüders / ![]() Abstract: To organize microtubules, cells tightly control the activity of the microtubule nucleator γ-tubulin ring complex (γTuRC). The open ring-shaped γTuRC was proposed to nucleate microtubules by a ...To organize microtubules, cells tightly control the activity of the microtubule nucleator γ-tubulin ring complex (γTuRC). The open ring-shaped γTuRC was proposed to nucleate microtubules by a template mechanism. However, its splayed structure does not match microtubule symmetry, leaving it unclear how γTuRC becomes an efficient nucleator. Here, we identify the mechanism of γTuRC activation by CDK5RAP2 centrosomin motif 1 (CM1). Using cryoelectron microscopy (cryo-EM), we find that activation involves binding of multiple CM1 dimers to five distinct sites around the outside of the γTuRC cone, which crucially depends on regulatory modules formed by MZT2 and the N-terminal extensions of GCP2 subunits. CM1 binding promotes lateral interactions between GCP subunits to facilitate microtubule-like conformations and release of luminal actin that is integral to non-activated γTuRC. We propose a model where generation of γTuRC with an expanded conformational range, rather than perfect symmetry, is sufficient to boost nucleation activity. | |||||||||
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Structure visualization
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Downloads & links
-EMDB archive
Map data | ![]() | 140.3 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 41.7 KB 41.7 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 12.7 KB | Display | ![]() |
Images | ![]() | 52.7 KB | ||
Masks | ![]() | 178 MB | ![]() | |
Filedesc metadata | ![]() | 11.5 KB | ||
Others | ![]() ![]() ![]() ![]() ![]() ![]() | 8.9 MB 8.9 MB 141.1 MB 165.9 MB 140.6 MB 140.6 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 8rx1MC C: citing same article ( M: atomic model generated by this map |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Annotation | 3D Refinement map of the gTuRC-CM1dim complex | ||||||||||||||||||||||||||||||||||||
Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.67 Å | ||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Mask #1
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Projections & Slices |
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Density Histograms |
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Sample components
+Entire : gTuRC-CM1dim complex
+Supramolecule #1: gTuRC-CM1dim complex
+Macromolecule #1: Tubulin gamma-1 chain
+Macromolecule #2: Actin b
+Macromolecule #3: Gamma-tubulin complex component 2
+Macromolecule #4: Gamma-tubulin complex component 3
+Macromolecule #5: CM1
+Macromolecule #6: Gamma-tubulin complex component 4
+Macromolecule #7: Gamma-tubulin complex component 5
+Macromolecule #8: Gamma-tubulin complex component 6
+Macromolecule #9: Mitotic-spindle organizing protein 1
+Macromolecule #10: Mitotic-spindle organizing protein 2A
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Buffer | pH: 7.5 |
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Grid | Model: Quantifoil R0.6/1 / Material: COPPER / Mesh: 300 / Support film - Material: CARBON / Support film - topology: CONTINUOUS / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 45 sec. / Pretreatment - Atmosphere: AIR / Pretreatment - Pressure: 10.0 kPa |
Vitrification | Cryogen name: ETHANE-PROPANE / Chamber humidity: 90 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Specialist optics | Energy filter - Name: TFS Selectris X / Energy filter - Slit width: 10 eV |
Image recording | Film or detector model: GATAN K3 (6k x 4k) / Number grids imaged: 1 / Number real images: 94094 / Average exposure time: 2.0 sec. / Average electron dose: 55.4 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 1.8 µm / Nominal defocus min: 0.9 µm |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |