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- PDB-7quq: BtubA(R284G,K286D,F287G):BtubB bacterial tubulin M-loop mutant fo... -
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Open data
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Basic information
Entry | Database: PDB / ID: 7quq | |||||||||
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Title | BtubA(R284G,K286D,F287G):BtubB bacterial tubulin M-loop mutant forming a single protofilament (Prosthecobacter dejongeii) | |||||||||
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![]() | CELL CYCLE / Cytyoskeleton / tubulin-like / cytomotive filaments | |||||||||
Function / homology | ![]() microtubule-based process / structural constituent of cytoskeleton / microtubule / GTP binding Similarity search - Function | |||||||||
Biological species | ![]() | |||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.6 Å | |||||||||
![]() | Wagstaff, J. / Planelles-Herrero, V.J. / Derivery, E. / Lowe, J. | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Diverse cytomotive actins and tubulins share a polymerization switch mechanism conferring robust dynamics. Authors: James Mark Wagstaff / Vicente José Planelles-Herrero / Grigory Sharov / Aisha Alnami / Frank Kozielski / Emmanuel Derivery / Jan Löwe / ![]() Abstract: Protein filaments are used in myriads of ways to organize other molecules within cells. Some filament-forming proteins couple the hydrolysis of nucleotides to their polymerization cycle, thus ...Protein filaments are used in myriads of ways to organize other molecules within cells. Some filament-forming proteins couple the hydrolysis of nucleotides to their polymerization cycle, thus powering the movement of other molecules. These filaments are termed cytomotive. Only members of the actin and tubulin protein superfamilies are known to form cytomotive filaments. We examined the basis of cytomotivity via structural studies of the polymerization cycles of actin and tubulin homologs from across the tree of life. We analyzed published data and performed structural experiments designed to disentangle functional components of these complex filament systems. Our analysis demonstrates the existence of shared subunit polymerization switches among both cytomotive actins and tubulins, i.e., the conformation of subunits switches upon assembly into filaments. These cytomotive switches can explain filament robustness, by enabling the coupling of kinetic and structural polarities required for cytomotive behaviors and by ensuring that single cytomotive filaments do not fall apart. | |||||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 422.1 KB | Display | ![]() |
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PDB format | ![]() | 345 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 1.3 MB | Display | ![]() |
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Full document | ![]() | 1.4 MB | Display | |
Data in XML | ![]() | 82 KB | Display | |
Data in CIF | ![]() | 120.2 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 14151MC ![]() 7qucC ![]() 7qudC ![]() 7qupC 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
#1: Protein | Mass: 51095.012 Da / Num. of mol.: 3 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() #2: Protein | Mass: 46497.570 Da / Num. of mol.: 3 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() #3: Chemical | ChemComp-G2P / Has ligand of interest | Y | |
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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: BtubAB heterodimer / Type: COMPLEX / Details: M-loop mutant BtubA(R284G,K286D,F287G) / Entity ID: #1-#2 / Source: RECOMBINANT |
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Source (natural) | Organism: ![]() ![]() |
Source (recombinant) | Organism: ![]() ![]() |
Buffer solution | pH: 7.7 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Specimen support | Grid material: GOLD / Grid type: UltrAuFoil R1.2/1.3 |
Vitrification | Cryogen name: NITROGEN |
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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: 3000 nm / Nominal defocus min: 1000 nm |
Image recording | Electron dose: 44 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) / Num. of real images: 6993 |
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Processing
EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||
3D reconstruction | Resolution: 2.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 290000 / Symmetry type: POINT | ||||||||||||||||||||
Atomic model building | Protocol: OTHER / Space: REAL | ||||||||||||||||||||
Atomic model building | PDB-ID: 2BTQ Accession code: 2BTQ / Source name: PDB / Type: experimental model |