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- EMDB-46992: Bovine Arp2/3 complex with N-WASP CA bound to Arp3 and Arp2-ArpC1 -
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Open data
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Basic information
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Title | Bovine Arp2/3 complex with N-WASP CA bound to Arp3 and Arp2-ArpC1 | |||||||||
![]() | Bovine Arp2/3 complex with N-WASP CA bound to Arp3 and Arp2-ArpC1 | |||||||||
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![]() | actin / arp 2-3 complex / N-WASP / nucleation promoting factor / STRUCTURAL PROTEIN | |||||||||
Function / homology | ![]() negative regulation of membrane tubulation / spindle localization / positive regulation of clathrin-dependent endocytosis / muscle cell projection membrane / 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 / spindle localization / positive regulation of clathrin-dependent endocytosis / muscle cell projection membrane / 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 / vesicle transport along actin filament / GTPase regulator activity / NOSTRIN mediated eNOS trafficking / actin cap / vesicle organization / regulation of actin filament polymerization / vesicle budding from membrane / Clathrin-mediated endocytosis / dendritic spine morphogenesis / actin polymerization or depolymerization / protein-containing complex localization / Nephrin family interactions / DCC mediated attractive signaling / regulation of postsynapse organization / positive regulation of filopodium assembly / Neutrophil degranulation / RHOV GTPase cycle / RHOJ GTPase cycle / positive regulation of actin filament polymerization / RHOQ GTPase cycle / CDC42 GTPase cycle / cilium assembly / RHO GTPases Activate WASPs and WAVEs / positive regulation of double-strand break repair via homologous recombination / positive regulation of lamellipodium assembly / actin filament polymerization / EPHB-mediated forward signaling / RAC1 GTPase cycle / positive regulation of substrate adhesion-dependent cell spreading / cell projection / FCGR3A-mediated phagocytosis / response to bacterium / Regulation of actin dynamics for phagocytic cup formation / structural constituent of cytoskeleton / endocytic vesicle membrane / actin filament binding / synaptic vesicle membrane / Clathrin-mediated endocytosis / cell migration / site of double-strand break / actin cytoskeleton / lamellipodium / regulation of protein localization / actin binding / actin cytoskeleton organization / protein-containing complex assembly / cytoplasmic vesicle / cell cortex / neuron projection / postsynapse / endosome / cell division / focal adhesion / endoplasmic reticulum membrane / glutamatergic synapse / positive regulation of transcription by RNA polymerase II / extracellular exosome / nucleoplasm / ATP binding / nucleus / plasma membrane / cytosol / cytoplasm Similarity search - Function | |||||||||
Biological species | ![]() ![]() ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 2.91 Å | |||||||||
![]() | Saks AJ / Barrie KR / Dominguez R | |||||||||
Funding support | ![]()
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![]() | ![]() Title: NPF binding to Arp2 is allosterically linked to the release of ArpC5's N-terminal tail and conformational changes in Arp2/3 complex. Authors: Andrew J Saks / Kyle R Barrie / Grzegorz Rebowski / Roberto Dominguez / ![]() Abstract: Arp2/3 complex generates branched actin networks essential for numerous motile functions of the cell. It comprises seven subunits: actin-related proteins (Arps) 2 and 3 and five scaffolding subunits ...Arp2/3 complex generates branched actin networks essential for numerous motile functions of the cell. It comprises seven subunits: actin-related proteins (Arps) 2 and 3 and five scaffolding subunits (ArpC1-5). The complex adopts two major conformations: inactive, with the Arps interacting end-to-end, and active, with the Arps aligned side-by-side like subunits in the actin filament. Activation involves several cofactors, including ATP, WASP-family nucleation-promoting factors (NPFs), actin monomers, and the mother actin filament. NPFs bind to two sites, one on Arp2-ArpC1 and one on Arp3, delivering actin subunits at the barbed end of the Arps to initiate branch elongation. However, the mechanisms by which each NPF drives the equilibrium toward activation remain unclear. We present two cryo-electron microscopy (cryo-EM) structures of Arp2/3 complex at 2.9-Å resolution: one with NPFs bound to Arp3 and ArpC1 but not Arp2 and another with NPFs bound to Arp3 and Arp2-ArpC1. The structures reveal that NPF binding to Arp2 is allosterically linked to the release of ArpC5's N-terminal tail from Arp2 and conformational changes in Arp2, including closure of its ATP-binding cleft and partial rotation and translation toward its position in the active complex at the branch. Previous work identified another allosteric switch linking NPF binding to Arp3 with the release of its inhibitory C-terminal tail, which we also observe. In summary, both NPF-binding sites induce allosteric changes in Arp2/3 complex, collectively shifting the equilibrium toward activation. | |||||||||
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Structure visualization
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Downloads & links
-EMDB archive
Map data | ![]() | 40.3 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 21.9 KB 21.9 KB | Display Display | ![]() |
Images | ![]() | 79.3 KB | ||
Filedesc metadata | ![]() | 7.3 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 443.3 KB | Display | ![]() |
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Full document | ![]() | 442.9 KB | Display | |
Data in XML | ![]() | 6.7 KB | Display | |
Data in CIF | ![]() | 7.8 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 9dlxMC ![]() 9dlzC C: citing same article ( M: atomic model generated by this map |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Annotation | Bovine Arp2/3 complex with N-WASP CA bound to Arp3 and Arp2-ArpC1 | ||||||||||||||||||||
Voxel size | X=Y=Z: 0.86 Å | ||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
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Sample components
+Entire : Arp 2/3 complex bound to NPFs
+Supramolecule #1: Arp 2/3 complex bound to NPFs
+Macromolecule #1: Actin-related protein 3
+Macromolecule #2: Actin-related protein 2
+Macromolecule #3: Actin-related protein 2/3 complex subunit 1A
+Macromolecule #4: Actin-related protein 2/3 complex subunit 2
+Macromolecule #5: Actin-related protein 2/3 complex subunit 3
+Macromolecule #6: Actin-related protein 2/3 complex subunit 4
+Macromolecule #7: Actin-related protein 2/3 complex subunit 5
+Macromolecule #8: Actin nucleation-promoting factor WASL
+Macromolecule #9: ADENOSINE-5'-TRIPHOSPHATE
+Macromolecule #10: MAGNESIUM ION
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Buffer | pH: 7.4 |
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Vitrification | Cryogen name: ETHANE |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: OTHER / Average electron dose: 47.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: OTHER / Imaging mode: OTHER / Nominal defocus max: 2.5 µm / Nominal defocus min: 0.5 µm |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |