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- PDB-6pek: Structure of Spastin Hexamer (Subunit A-E) in complex with substr... -
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Basic information
Entry | Database: PDB / ID: 6pek | ||||||
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Title | Structure of Spastin Hexamer (Subunit A-E) in complex with substrate peptide | ||||||
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![]() | MOTOR PROTEIN / AAA+ ATPase / Microtubule Severing | ||||||
Function / homology | ![]() cytokinetic process / microtubule-severing ATPase / microtubule severing ATPase activity / microtubule severing / endoplasmic reticulum tubular network / positive regulation of microtubule depolymerization / cytoskeleton-dependent cytokinesis / mitotic nuclear membrane reassembly / nuclear membrane reassembly / Sealing of the nuclear envelope (NE) by ESCRT-III ...cytokinetic process / microtubule-severing ATPase / microtubule severing ATPase activity / microtubule severing / endoplasmic reticulum tubular network / positive regulation of microtubule depolymerization / cytoskeleton-dependent cytokinesis / mitotic nuclear membrane reassembly / nuclear membrane reassembly / Sealing of the nuclear envelope (NE) by ESCRT-III / membrane fission / microtubule bundle formation / anterograde axonal transport / mitotic spindle disassembly / protein hexamerization / exit from mitosis / axonal transport of mitochondrion / beta-tubulin binding / positive regulation of cytokinesis / mitotic cytokinesis / alpha-tubulin binding / endoplasmic reticulum to Golgi vesicle-mediated transport / axon cytoplasm / lipid droplet / axonogenesis / isomerase activity / protein homooligomerization / spindle pole / midbody / cytoplasmic vesicle / microtubule binding / nuclear membrane / microtubule / endosome / axon / centrosome / endoplasmic reticulum membrane / protein-containing complex binding / perinuclear region of cytoplasm / ATP hydrolysis activity / extracellular exosome / nucleoplasm / ATP binding / nucleus / cytosol / cytoplasm Similarity search - Function | ||||||
Biological species | ![]() synthetic construct (others) | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.2 Å | ||||||
![]() | Han, H. / Schubert, H.L. / McCullough, J. / Monroe, N. / Sundquist, W.I. / Hill, C.P. | ||||||
Funding support | ![]()
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![]() | ![]() Title: Structure of spastin bound to a glutamate-rich peptide implies a hand-over-hand mechanism of substrate translocation. Authors: Han Han / Heidi L Schubert / John McCullough / Nicole Monroe / Michael D Purdy / Mark Yeager / Wesley I Sundquist / Christopher P Hill / ![]() Abstract: Many members of the AAA+ ATPase family function as hexamers that unfold their protein substrates. These AAA unfoldases include spastin, which plays a critical role in the architecture of eukaryotic ...Many members of the AAA+ ATPase family function as hexamers that unfold their protein substrates. These AAA unfoldases include spastin, which plays a critical role in the architecture of eukaryotic cells by driving the remodeling and severing of microtubules, which are cytoskeletal polymers of tubulin subunits. Here, we demonstrate that a human spastin binds weakly to unmodified peptides from the C-terminal segment of human tubulin α1A/B. A peptide comprising alternating glutamate and tyrosine residues binds more tightly, which is consistent with the known importance of glutamylation for spastin microtubule severing activity. A cryo-EM structure of the spastin-peptide complex at 4.2 Å resolution revealed an asymmetric hexamer in which five spastin subunits adopt a helical, spiral staircase configuration that binds the peptide within the central pore, whereas the sixth subunit of the hexamer is displaced from the peptide/substrate, as if transitioning from one end of the helix to the other. This configuration differs from a recently published structure of spastin from , which forms a six-subunit spiral without a transitioning subunit. Our structure resembles other recently reported AAA unfoldases, including the meiotic clade relative Vps4, and supports a model in which spastin utilizes a hand-over-hand mechanism of tubulin translocation and microtubule remodeling. | ||||||
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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PDBx/mmCIF format | ![]() | 263.7 KB | Display | ![]() |
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PDB format | ![]() | 206 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 20327MC ![]() 6penC M: map data used to model this data C: citing same article ( |
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Similar structure data | |
EM raw data | ![]() Data size: 1.8 TB Data #1: Unaligned multi-frame movies of ADPBeFx-bound Spastin [micrographs - multiframe]) |
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Links
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 54498.328 Da / Num. of mol.: 5 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() #2: Protein/peptide | | Mass: 1479.453 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) synthetic construct (others) #3: Chemical | ChemComp-ADP / #4: Chemical | ChemComp-BEF / #5: Chemical | ChemComp-MG / 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: single particle reconstruction |
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Sample preparation
Component | Name: Spastin Hexamer in complex with substrate peptide / Type: COMPLEX / Entity ID: #1-#2 / Source: MULTIPLE SOURCES |
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Molecular weight | Experimental value: NO |
Source (natural) | Organism: ![]() |
Buffer solution | pH: 8 |
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 |
Image recording | Electron dose: 57 e/Å2 / Film or detector model: FEI FALCON III (4k x 4k) |
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Processing
Software | Name: PHENIX / Version: 1.16_3549: / Classification: refinement | ||||||||||||||||||||||||
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
3D reconstruction | Resolution: 4.2 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 119984 / Symmetry type: POINT | ||||||||||||||||||||||||
Refine LS restraints |
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