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- PDB-7t5q: Cryo-EM Structure of a Transition State of Arp2/3 Complex Activation -
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Open data
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Basic information
Entry | Database: PDB / ID: 7t5q | ||||||||||||
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Title | Cryo-EM Structure of a Transition State of Arp2/3 Complex Activation | ||||||||||||
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![]() | CONTRACTILE PROTEIN / actin / ATPase / actin related protein / arp / cytoskeleton / Arp2-3 complex / actin nucleation / actin branching / CapZ | ||||||||||||
Function / homology | ![]() negative regulation of membrane tubulation / muscle cell projection membrane / spindle localization / positive regulation of clathrin-dependent endocytosis / EPHB-mediated forward signaling / Regulation of actin dynamics for phagocytic cup formation / RHO GTPases Activate WASPs and WAVEs / Arp2/3 protein complex / Arp2/3 complex-mediated actin nucleation / negative regulation of lymphocyte migration ...negative regulation of membrane tubulation / muscle cell projection membrane / spindle localization / positive regulation of clathrin-dependent endocytosis / EPHB-mediated forward signaling / Regulation of actin dynamics for phagocytic cup formation / RHO GTPases Activate WASPs and WAVEs / Arp2/3 protein complex / Arp2/3 complex-mediated actin nucleation / negative regulation of lymphocyte migration / actin nucleation / F-actin capping protein complex / WASH complex / vesicle transport along actin filament / sperm head-tail coupling apparatus / actin cap / vesicle organization / regulation of actin filament polymerization / vesicle budding from membrane / Clathrin-mediated endocytosis / barbed-end actin filament capping / cell junction assembly / dendritic spine morphogenesis / actin polymerization or depolymerization / protein-containing complex localization / RHOD GTPase cycle / regulation of cell morphogenesis / RHOF GTPase cycle / COPI-independent Golgi-to-ER retrograde traffic / regulation of postsynapse organization / positive regulation of filopodium assembly / Sensory processing of sound by inner hair cells of the cochlea / lamellipodium assembly / Neutrophil degranulation / cytoskeletal motor activator activity / myosin heavy chain binding / tropomyosin binding / cortical cytoskeleton / troponin I binding / filamentous actin / mesenchyme migration / actin filament bundle / brush border / actin filament bundle assembly / Advanced glycosylation endproduct receptor signaling / skeletal muscle myofibril / striated muscle thin filament / skeletal muscle thin filament assembly / actin monomer binding / cilium assembly / positive regulation of double-strand break repair via homologous recombination / stress fiber / COPI-mediated anterograde transport / skeletal muscle fiber development / positive regulation of lamellipodium assembly / titin binding / actin filament polymerization / cytoskeleton organization / MHC class II antigen presentation / Gene and protein expression by JAK-STAT signaling after Interleukin-12 stimulation / HSP90 chaperone cycle for steroid hormone receptors (SHR) in the presence of ligand / hippocampal mossy fiber to CA3 synapse / sarcomere / cell projection / filopodium / actin filament / response to bacterium / Schaffer collateral - CA1 synapse / Hydrolases; Acting on acid anhydrides; Acting on acid anhydrides to facilitate cellular and subcellular movement / structural constituent of cytoskeleton / calcium-dependent protein binding / actin filament binding / cell migration / lamellipodium / actin cytoskeleton / regulation of protein localization / site of double-strand break / actin binding / Factors involved in megakaryocyte development and platelet production / cell body / actin cytoskeleton organization / cell cortex / protein-containing complex assembly / cytoplasmic vesicle / cytoskeleton / hydrolase activity / neuron projection / postsynaptic density / cadherin binding / protein domain specific binding / cell division / synapse / calcium ion binding / positive regulation of gene expression / glutamatergic synapse / magnesium ion binding / positive regulation of transcription by RNA polymerase II / extracellular exosome / extracellular region / ATP binding Similarity search - Function | ||||||||||||
Biological species | ![]() ![]() ![]() ![]() ![]() ![]() ![]() | ||||||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.4 Å | ||||||||||||
![]() | Rebowski, G. / van Eeuwen, T. / Boczkowska, M. / Dominguez, R. | ||||||||||||
Funding support | ![]()
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![]() | ![]() Title: Transition State of Arp2/3 Complex Activation by Actin-Bound Dimeric Nucleation-Promoting Factor. Authors: Trevor van Eeuwen / Malgorzata Boczkowska / Grzegorz Rebowski / Peter J Carman / Fred E Fregoso / Roberto Dominguez / ![]() Abstract: Arp2/3 complex generates branched actin networks that drive fundamental processes such as cell motility and cytokinesis. The complex comprises seven proteins, including actin-related proteins (Arps) ...Arp2/3 complex generates branched actin networks that drive fundamental processes such as cell motility and cytokinesis. The complex comprises seven proteins, including actin-related proteins (Arps) 2 and 3 and five scaffolding proteins (ArpC1-ArpC5) that mediate interactions with a pre-existing (mother) actin filament at the branch junction. Arp2/3 complex exists in two main conformations, inactive with the Arps interacting end-to-end and active with the Arps interacting side-by-side like subunits of the short-pitch helix of the actin filament. Several cofactors drive the transition toward the active state, including ATP binding to the Arps, WASP-family nucleation-promoting factors (NPFs), actin monomers, and binding of Arp2/3 complex to the mother filament. The precise contribution of each cofactor to activation is poorly understood. We report the 3.32-Å resolution cryo-electron microscopy structure of a transition state of Arp2/3 complex activation with bound constitutively dimeric NPF. Arp2/3 complex-binding region of the NPF N-WASP was fused C-terminally to the α and β subunits of the CapZ heterodimer. One arm of the NPF dimer binds Arp2 and the other binds actin and Arp3. The conformation of the complex is intermediate between those of inactive and active Arp2/3 complex. Arp2, Arp3, and actin also adopt intermediate conformations between monomeric (G-actin) and filamentous (F-actin) states, but only actin hydrolyzes ATP. In solution, the transition complex is kinetically shifted toward the short-pitch conformation and has higher affinity for F-actin than inactive Arp2/3 complex. The results reveal how all the activating cofactors contribute in a coordinated manner toward Arp2/3 complex activation. | ||||||||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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PDBx/mmCIF format | ![]() | 554.9 KB | Display | ![]() |
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PDB format | ![]() | 438.7 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 25707MC 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
-Actin-related protein ... , 7 types, 7 molecules ABCDEFG
#1: Protein | Mass: 47428.031 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
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#2: Protein | Mass: 44818.711 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#3: Protein | Mass: 41594.238 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#4: Protein | Mass: 34402.043 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#5: Protein | Mass: 20572.666 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#6: Protein | Mass: 19697.047 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#7: Protein | Mass: 16251.308 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
-Protein , 1 types, 1 molecules H
#8: Protein | Mass: 41875.633 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
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-F-actin-capping protein subunit ... , 2 types, 2 molecules IJ
#9: Protein | Mass: 39600.566 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() Gene: CAPZA1, Wasl / Production host: ![]() ![]() |
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#10: Protein | Mass: 37470.754 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() Gene: CAPZB, Wasl / Production host: ![]() ![]() |
-Non-polymers , 3 types, 6 molecules 




#11: Chemical | #12: Chemical | #13: Chemical | ChemComp-ADP / | |
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-Details
Has ligand of interest | N |
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Has protein modification | Y |
-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
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Molecular weight | Value: 0.2489 MDa / Experimental value: NO | |||||||||||||||||||||||||||||||||||
Source (natural) |
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Source (recombinant) |
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Buffer solution | pH: 7 | |||||||||||||||||||||||||||||||||||
Buffer component |
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Specimen | Conc.: 5 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES / Details: This sample was monodisperse. | |||||||||||||||||||||||||||||||||||
Vitrification | Instrument: LEICA EM CPC / Cryogen name: ETHANE Details: Grids were manually blotted for 3 seconds with Whatman 41 filter paper and manually plunged using a Leica EM CPC manual plunger. |
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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 Details: Data were collected in super-resolution mode with an illuminated area of 1.01 um, nominal dose of 40 e-/A^2, a dose rate of 4.87 e-/s/pixel, and 2 or 5 exposures per hole by image shift. |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal magnification: 165000 X / Nominal defocus max: 3500 nm / Nominal defocus min: 1500 nm / Cs: 2.7 mm / C2 aperture diameter: 100 µm / Alignment procedure: COMA FREE |
Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Image recording | Average exposure time: 2.6 sec. / Electron dose: 50 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K3 (6k x 4k) / Num. of grids imaged: 1 / Num. of real images: 9661 |
EM imaging optics | Energyfilter slit width: 20 eV |
Image scans | Width: 5760 / Height: 4092 / Movie frames/image: 40 / Used frames/image: 1-40 |
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Processing
Software | Name: PHENIX / Version: 1.20.1_4487: / Classification: refinement | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
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EM software |
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Image processing | Details: Super resolution mode; micrographs binned during motion correction | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
CTF correction | Details: CTF correction was done in cryoSPARC for intial 2D classification and then repeated in CTFFIND4 (Relion) for classification and final reconstruction. Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Particle selection | Num. of particles selected: 4485066 / Details: Particles autopicked in cryoSPARC | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Symmetry | Point symmetry: C1 (asymmetric) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 269760 / Algorithm: FOURIER SPACE / Details: Composite map after multibody refinement / Num. of class averages: 1 / Symmetry type: POINT | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Atomic model building | B value: 132 / Protocol: FLEXIBLE FIT / Space: REAL / Target criteria: correlation | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Atomic model building | PDB-ID: 4JD2 Accession code: 4JD2 / Source name: PDB / Type: experimental model | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refine LS restraints |
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