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Yorodumi- EMDB-47948: Tubulin cofactors D,E,G,C bound to tubulin dimer -- TBCC N termin... -
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Basic information
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| Title | Tubulin cofactors D,E,G,C bound to tubulin dimer -- TBCC N terminus unbound | |||||||||
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Keywords | Tubulin / Cofactors / Tubulin biogeneis / Tubulin degradation / microtubules / CYTOSOLIC PROTEIN | |||||||||
| Function / homology | Function and homology informationpost-chaperonin tubulin folding pathway / tubulin complex assembly / motile cilium / small molecule binding / alpha-tubulin binding / beta-tubulin binding / GTPase activator activity / structural constituent of cytoskeleton / microtubule cytoskeleton organization / neuron migration ...post-chaperonin tubulin folding pathway / tubulin complex assembly / motile cilium / small molecule binding / alpha-tubulin binding / beta-tubulin binding / GTPase activator activity / structural constituent of cytoskeleton / microtubule cytoskeleton organization / neuron migration / protein folding / mitotic cell cycle / microtubule cytoskeleton / Hydrolases; Acting on acid anhydrides; Acting on GTP to facilitate cellular and subcellular movement / molecular adaptor activity / microtubule / hydrolase activity / GTPase activity / GTP binding / metal ion binding / cytoplasm Similarity search - Function | |||||||||
| Biological species | ![]() ![]() ![]() | |||||||||
| Method | single particle reconstruction / cryo EM / Resolution: 3.8 Å | |||||||||
Authors | Taheri A / Al-bassam J | |||||||||
| Funding support | United States, 1 items
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Citation | Journal: Nat Commun / Year: 2025Title: Cryo-EM structures of the tubulin cofactors reveal the molecular basis of alpha/beta-tubulin biogenesis. Authors: Aryan Taheri / Zhoaqian Wang / Bharti Singal / Fei Guo / Jawdat Al-Bassam / ![]() Abstract: Microtubule polarity and dynamic polymerization arise from the self-association properties of the αβ-tubulin heterodimer. For decades, it has remained unclear how the tubulin cofactors TBCD, TBCE, ...Microtubule polarity and dynamic polymerization arise from the self-association properties of the αβ-tubulin heterodimer. For decades, it has remained unclear how the tubulin cofactors TBCD, TBCE, TBCC, and the Arl2 GTPase mediate the biogenesis of αβ-tubulin from individual α- and β-tubulins. Here, we use cryo-electron microscopy to determine structures of tubulin cofactors bound to αβ-tubulin. TBCD, TBCE, and Arl2 form a heterotrimeric cage-like assembly, we term TBC-DEG, around the αβ-tubulin heterodimer. The TBC-DEG-αβ-tubulin structures show that TBC-DEG wraps around β-tubulin while TBCE extends along α-tubulin. The TBC-DEG/TBCC-αβ-tubulin structures reveal that TBCC forms multi-domain interactions with Arl2 and TBCD to engage the αβ-tubulin intradimer-interface, promoting TBCE rotation while TBCD holds β-tubulin. TBCC engages the GTP-bound Arl2, multiple sites of TBCD, and the native αβ-tubulin intradimer interface near the α-tubulin N-site GTP. Together, these structures uncover transition states for αβ-tubulin biogenesis and degradation, suggesting a vise-like, GTP-hydrolysis-dependent mechanism in which TBCC binding to TBC-DEG modulates αβ-tubulin interfaces. Our studies provide structural evidence that tubulin cofactors act as enzymatic regulators that assemble the invariant αβ-tubulin architecture. By catalyzing α- and β-tubulin biogenesis and degradation, the TBC-DEG and TBCC assemblies regulate the polymerization competency of αβ-tubulin for microtubule formation. | |||||||||
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Structure visualization
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Downloads & links
-EMDB archive
| Map data | emd_47948.map.gz | 226.5 MB | EMDB map data format | |
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| Header (meta data) | emd-47948-v30.xml emd-47948.xml | 23.8 KB 23.8 KB | Display Display | EMDB header |
| Images | emd_47948.png | 148.1 KB | ||
| Filedesc metadata | emd-47948.cif.gz | 8.1 KB | ||
| Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-47948 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-47948 | HTTPS FTP |
-Related structure data
| Related structure data | ![]() 9edsMC ![]() 9edrC ![]() 9edtC ![]() 9eebC C: citing same article ( M: atomic model generated by this map |
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| Similar structure data | Similarity search - Function & homology F&H Search |
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Links
| EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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| Related items in Molecule of the Month |
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Map
| File | Download / File: emd_47948.map.gz / Format: CCP4 / Size: 244.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||
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| Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||
| Voxel size | X=Y=Z: 0.88 Å | ||||||||||||||||||||||||||||||||||||
| Density |
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| Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
| Details | EMDB XML:
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-Supplemental data
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Sample components
+Entire : Tubulin Cofactors D,E,G,C and Tubulin complex
+Supramolecule #1: Tubulin Cofactors D,E,G,C and Tubulin complex
+Macromolecule #1: Chromosome instability protein 1
+Macromolecule #2: Protein PAC2
+Macromolecule #3: GTP-binding protein CIN4
+Macromolecule #4: Tubulin alpha-1A chain
+Macromolecule #5: Tubulin beta chain
+Macromolecule #6: iih5 Alpha Repeating
+Macromolecule #7: Tubulin-specific chaperone C
+Macromolecule #8: GUANOSINE-5'-TRIPHOSPHATE
+Macromolecule #9: GUANOSINE-5'-DIPHOSPHATE
-Experimental details
-Structure determination
| Method | cryo EM |
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Processing | single particle reconstruction |
| Aggregation state | particle |
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Sample preparation
| Buffer | pH: 7 |
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| Vitrification | Cryogen name: ETHANE |
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Electron microscopy
| Microscope | TFS GLACIOS |
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| Image recording | Film or detector model: GATAN K3 (6k x 4k) / Average electron dose: 60.0 e/Å2 |
| Electron beam | Acceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN |
| Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 1.7 µm / Nominal defocus min: 0.7000000000000001 µm |
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Authors
United States, 1 items
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Processing
FIELD EMISSION GUN