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Open data
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Basic information
Entry | Database: PDB / ID: 8tah | |||||||||
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Title | Cryo-EM structure of Cortactin-bound to Arp2/3 complex | |||||||||
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![]() | CONTRACTILE PROTEIN / Complex / migration / actin / cytoskeleton | |||||||||
Function / homology | ![]() lamellipodium organization / EPHB-mediated forward signaling / site of polarized growth / Regulation of actin dynamics for phagocytic cup formation / RHO GTPases Activate WASPs and WAVEs / Arp2/3 protein complex / Arp2/3 complex-mediated actin nucleation / Arp2/3 complex binding / modification of postsynaptic actin cytoskeleton / modification of postsynaptic structure ...lamellipodium organization / EPHB-mediated forward signaling / site of polarized growth / Regulation of actin dynamics for phagocytic cup formation / RHO GTPases Activate WASPs and WAVEs / Arp2/3 protein complex / Arp2/3 complex-mediated actin nucleation / Arp2/3 complex binding / modification of postsynaptic actin cytoskeleton / modification of postsynaptic structure / mitotic spindle midzone / regulation of cell projection assembly / regulation of mitophagy / postsynaptic actin cytoskeleton / profilin binding / positive regulation of smooth muscle contraction / regulation of actin filament polymerization / positive regulation of chemotaxis / Clathrin-mediated endocytosis / substrate-dependent cell migration, cell extension / focal adhesion assembly / podosome / proline-rich region binding / dendritic spine maintenance / Neutrophil degranulation / regulation of axon extension / cortical actin cytoskeleton / cortical cytoskeleton / positive regulation of actin filament polymerization / positive regulation of double-strand break repair via homologous recombination / cilium assembly / positive regulation of lamellipodium assembly / extrinsic apoptotic signaling pathway / clathrin-coated pit / voltage-gated potassium channel complex / ruffle / actin filament polymerization / neuron projection morphogenesis / receptor-mediated endocytosis / cell projection / cell motility / actin filament / negative regulation of extrinsic apoptotic signaling pathway / intracellular protein transport / structural constituent of cytoskeleton / actin filament binding / cell migration / lamellipodium / cell junction / site of double-strand break / cell cortex / actin cytoskeleton organization / postsynapse / dendritic spine / neuron projection / focal adhesion / glutamatergic synapse / synapse / Golgi apparatus / endoplasmic reticulum / positive regulation of transcription by RNA polymerase II / ATP binding / nucleus / plasma membrane / cytoplasm / cytosol Similarity search - Function | |||||||||
Biological species | ![]() ![]() ![]() ![]() | |||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.89 Å | |||||||||
![]() | Fregoso, F.E. / van Eeuwen, T. / Dominguez, R. | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Mechanism of synergistic activation of Arp2/3 complex by cortactin and WASP-family proteins. Authors: Fred E Fregoso / Malgorzata Boczkowska / Grzegorz Rebowski / Peter J Carman / Trevor van Eeuwen / Roberto Dominguez / ![]() Abstract: Cortactin coactivates Arp2/3 complex synergistically with WASP-family nucleation-promoting factors (NPFs) and stabilizes branched networks by linking Arp2/3 complex to F-actin. It is poorly ...Cortactin coactivates Arp2/3 complex synergistically with WASP-family nucleation-promoting factors (NPFs) and stabilizes branched networks by linking Arp2/3 complex to F-actin. It is poorly understood how cortactin performs these functions. We describe the 2.89 Å resolution cryo-EM structure of cortactin's N-terminal domain (Cort) bound to Arp2/3 complex. Cortactin binds Arp2/3 complex through an inverted Acidic domain (D20-V29), which targets the same site on Arp3 as the Acidic domain of NPFs but with opposite polarity. Sequences N- and C-terminal to cortactin's Acidic domain do not increase its affinity for Arp2/3 complex but contribute toward coactivation with NPFs. Coactivation further increases with NPF dimerization and for longer cortactin constructs with stronger binding to F-actin. The results suggest that cortactin contributes to Arp2/3 complex coactivation with NPFs in two ways, by helping recruit the complex to F-actin and by stabilizing the short-pitch (active) conformation, which are both byproducts of cortactin's core function in branch stabilization. | |||||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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PDBx/mmCIF format | ![]() | 387.8 KB | Display | ![]() |
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PDB format | ![]() | 304.8 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 1.3 MB | Display | ![]() |
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Full document | ![]() | 1.3 MB | Display | |
Data in XML | ![]() | 61.2 KB | Display | |
Data in CIF | ![]() | 92.6 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 41135MC 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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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: 16309.343 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
-Protein , 1 types, 1 molecules H
#8: Protein | Mass: 8684.353 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() |
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-Non-polymers , 2 types, 4 molecules ![](data/chem/img/MG.gif)
![](data/chem/img/ATP.gif)
![](data/chem/img/ATP.gif)
#9: Chemical | #10: Chemical | |
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-Details
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: Cortactin NTA bound to Arp2/3 complex / Type: COMPLEX / Entity ID: #1-#8 / Source: MULTIPLE SOURCES | |||||||||||||||||||||||||
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Molecular weight | Value: .223 MDa / Experimental value: NO | |||||||||||||||||||||||||
Source (natural) | Organism: ![]() ![]() | |||||||||||||||||||||||||
Buffer solution | pH: 7 Details: 10 mM imidazole pH 7.0, 50 mM KCl, 2 mM MgCl2, 1 mM EGTA | |||||||||||||||||||||||||
Buffer component |
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Specimen | Conc.: 2 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES / Details: monodisperse | |||||||||||||||||||||||||
Specimen support | Grid mesh size: 200 divisions/in. / Grid type: Quantifoil R1.2/1.3 | |||||||||||||||||||||||||
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: OTHER / Nominal defocus max: 3000 nm / Nominal defocus min: 1000 nm |
Image recording | Electron dose: 41.6 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) |
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Processing
EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||
Particle selection | Num. of particles selected: 1461919 | ||||||||||||||||||||||||||||
3D reconstruction | Resolution: 2.89 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 241506 / Symmetry type: POINT | ||||||||||||||||||||||||||||
Atomic model building | Protocol: RIGID BODY FIT | ||||||||||||||||||||||||||||
Atomic model building | PDB-ID: 1K8K Accession code: 1K8K / Source name: PDB / Type: experimental model | ||||||||||||||||||||||||||||
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