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Open data
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Basic information
Entry | Database: PDB / ID: 6bjc | ||||||||||||||||||
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Title | TPX2_mini decorated GMPCPP-microtubule | ||||||||||||||||||
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![]() | CELL CYCLE / mitosis / GanGTP / nucleation | ||||||||||||||||||
Function / homology | ![]() importin-alpha family protein binding / activation of protein kinase activity / negative regulation of microtubule depolymerization / axon hillock / microtubule nucleation / Microtubule-dependent trafficking of connexons from Golgi to the plasma membrane / Resolution of Sister Chromatid Cohesion / Hedgehog 'off' state / Cilium Assembly / Intraflagellar transport ...importin-alpha family protein binding / activation of protein kinase activity / negative regulation of microtubule depolymerization / axon hillock / microtubule nucleation / Microtubule-dependent trafficking of connexons from Golgi to the plasma membrane / Resolution of Sister Chromatid Cohesion / Hedgehog 'off' state / Cilium Assembly / Intraflagellar transport / COPI-dependent Golgi-to-ER retrograde traffic / Mitotic Prometaphase / Carboxyterminal post-translational modifications of tubulin / RHOH GTPase cycle / EML4 and NUDC in mitotic spindle formation / Sealing of the nuclear envelope (NE) by ESCRT-III / Kinesins / PKR-mediated signaling / Separation of Sister Chromatids / The role of GTSE1 in G2/M progression after G2 checkpoint / Aggrephagy / RHO GTPases activate IQGAPs / RHO GTPases Activate Formins / HSP90 chaperone cycle for steroid hormone receptors (SHR) in the presence of ligand / MHC class II antigen presentation / Recruitment of NuMA to mitotic centrosomes / COPI-mediated anterograde transport / mitotic spindle assembly / intercellular bridge / regulation of mitotic spindle organization / AURKA Activation by TPX2 / structural constituent of cytoskeleton / spindle / microtubule cytoskeleton organization / neuron migration / spindle pole / mitotic spindle / mitotic cell cycle / microtubule cytoskeleton / Hydrolases; Acting on acid anhydrides; Acting on GTP to facilitate cellular and subcellular movement / molecular adaptor activity / Regulation of TP53 Activity through Phosphorylation / microtubule / cell division / GTPase activity / apoptotic process / protein kinase binding / GTP binding / nucleoplasm / metal ion binding / nucleus / cytosol / cytoplasm Similarity search - Function | ||||||||||||||||||
Biological species | ![]() ![]() ![]() | ||||||||||||||||||
Method | ELECTRON MICROSCOPY / helical reconstruction / cryo EM / Resolution: 3.3 Å | ||||||||||||||||||
![]() | Zhang, R. / Nogales, E. | ||||||||||||||||||
Funding support | ![]() ![]()
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![]() | ![]() Title: Structural insight into TPX2-stimulated microtubule assembly. Authors: Rui Zhang / Johanna Roostalu / Thomas Surrey / Eva Nogales / ![]() ![]() Abstract: During mitosis and meiosis, microtubule (MT) assembly is locally upregulated by the chromatin-dependent Ran-GTP pathway. One of its key targets is the MT-associated spindle assembly factor TPX2. The ...During mitosis and meiosis, microtubule (MT) assembly is locally upregulated by the chromatin-dependent Ran-GTP pathway. One of its key targets is the MT-associated spindle assembly factor TPX2. The molecular mechanism of how TPX2 stimulates MT assembly remains unknown because structural information about the interaction of TPX2 with MTs is lacking. Here, we determine the cryo-electron microscopy structure of a central region of TPX2 bound to the MT surface. TPX2 uses two flexibly linked elements ('ridge' and 'wedge') in a novel interaction mode to simultaneously bind across longitudinal and lateral tubulin interfaces. These MT-interacting elements overlap with the binding site of importins on TPX2. Fluorescence microscopy-based in vitro reconstitution assays reveal that this interaction mode is critical for MT binding and facilitates MT nucleation. Together, our results suggest a molecular mechanism of how the Ran-GTP gradient can regulate TPX2-dependent MT formation. | ||||||||||||||||||
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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PDB format | ![]() | 822.6 KB | Display | ![]() |
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-Validation report
Summary document | ![]() | 1.6 MB | Display | ![]() |
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Full document | ![]() | 1.6 MB | Display | |
Data in XML | ![]() | 130.6 KB | Display | |
Data in CIF | ![]() | 197.6 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 7101MC ![]() 7102C M: map data used to model this data C: citing same article ( |
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Assembly
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Noncrystallographic symmetry (NCS) | NCS domain:
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