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- PDB-6w17: Structure of Dip1-activated Arp2/3 complex with nucleated actin f... -
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Open data
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Basic information
Entry | Database: PDB / ID: 6w17 | ||||||
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Title | Structure of Dip1-activated Arp2/3 complex with nucleated actin filament | ||||||
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![]() | STRUCTURAL PROTEIN / Arp2/3 / actin / Dip1 / cytoskeletal protein / actin regulator | ||||||
Function / homology | ![]() protein localization to actin cortical patch / Regulation of actin dynamics for phagocytic cup formation / RHO GTPases Activate WASPs and WAVEs / Clathrin-mediated endocytosis / actin cortical patch organization / Neutrophil degranulation / medial cortex / actin cortical patch localization / cell cortex of cell tip / positive regulation of Arp2/3 complex-mediated actin nucleation ...protein localization to actin cortical patch / Regulation of actin dynamics for phagocytic cup formation / RHO GTPases Activate WASPs and WAVEs / Clathrin-mediated endocytosis / actin cortical patch organization / Neutrophil degranulation / medial cortex / actin cortical patch localization / cell cortex of cell tip / positive regulation of Arp2/3 complex-mediated actin nucleation / actin cortical patch assembly / Arp2/3 protein complex / Arp2/3 complex-mediated actin nucleation / Arp2/3 complex binding / cell tip / actin cortical patch / regulation of actin filament polymerization / cell septum / mating projection tip / cortical actin cytoskeleton organization / cytoskeletal motor activator activity / establishment or maintenance of cell polarity / tropomyosin binding / mesenchyme migration / cell division site / troponin I binding / myosin heavy chain binding / filamentous actin / actin filament bundle / skeletal muscle thin filament assembly / striated muscle thin filament / actin filament bundle assembly / mitotic cytokinesis / skeletal muscle myofibril / actin monomer binding / skeletal muscle fiber development / stress fiber / titin binding / actin filament polymerization / filopodium / actin filament / Hydrolases; Acting on acid anhydrides; Acting on acid anhydrides to facilitate cellular and subcellular movement / structural constituent of cytoskeleton / actin filament binding / endocytosis / calcium-dependent protein binding / lamellipodium / cell cortex / cell body / toxin activity / hydrolase activity / protein domain specific binding / calcium ion binding / positive regulation of gene expression / magnesium ion binding / ATP binding / identical protein binding / nucleus / cytoplasm / cytosol Similarity search - Function | ||||||
Biological species | ![]() ![]() ![]() ![]() ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.9 Å | ||||||
![]() | Shaaban, M. / Nolen, B.J. / Chowdhury, S. | ||||||
Funding support | ![]()
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![]() | ![]() Title: Cryo-EM reveals the transition of Arp2/3 complex from inactive to nucleation-competent state. Authors: Mohammed Shaaban / Saikat Chowdhury / Brad J Nolen / ![]() Abstract: Arp2/3 complex, a crucial actin filament nucleator, undergoes structural rearrangements during activation by nucleation-promoting factors (NPFs). However, the conformational pathway leading to the ...Arp2/3 complex, a crucial actin filament nucleator, undergoes structural rearrangements during activation by nucleation-promoting factors (NPFs). However, the conformational pathway leading to the nucleation-competent state is unclear due to lack of high-resolution structures of the activated state. Here we report a ~3.9 Å resolution cryo-EM structure of activated Schizosaccharomyces pombe Arp2/3 complex bound to the S. pombe NPF Dip1 and attached to the end of the nucleated actin filament. The structure reveals global and local conformational changes that allow the two actin-related proteins in Arp2/3 complex to mimic a filamentous actin dimer and template nucleation. Activation occurs through a clamp-twisting mechanism, in which Dip1 forces two core subunits in Arp2/3 complex to pivot around one another, shifting half of the complex into a new activated position. By showing how Dip1 stimulates activation, the structure reveals how NPFs can activate Arp2/3 complex in diverse cellular processes. | ||||||
History |
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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PDBx/mmCIF format | ![]() | 626.3 KB | Display | ![]() |
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PDB format | ![]() | 509.6 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 1.4 MB | Display | ![]() |
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Full document | ![]() | 1.4 MB | Display | |
Data in XML | ![]() | 99.7 KB | Display | |
Data in CIF | ![]() | 151.1 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 21502MC ![]() 6w18C M: map data used to model this data C: citing same article ( |
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Similar structure data |
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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: 47427.137 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) ![]() ![]() Plasmid details: Fission yeast / Strain: 972 / ATCC 24843 / References: UniProt: P32390 |
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#2: Protein | Mass: 44286.758 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) ![]() ![]() Plasmid details: Fission yeast / Strain: 972 / ATCC 24843 / References: UniProt: Q9UUJ1 |
#3: Protein | Mass: 41643.465 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) ![]() ![]() Plasmid details: Fission yeast / Strain: 972 / ATCC 24843 / References: UniProt: P78774 |
#4: Protein | Mass: 37025.230 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) ![]() ![]() Plasmid details: Fission yeast / Strain: 972 / ATCC 24843 / References: UniProt: O14241 |
#5: Protein | Mass: 19865.746 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) ![]() ![]() Plasmid details: Fission yeast / Strain: 972 / ATCC 24843 / References: UniProt: Q9Y7J4 |
#6: Protein | Mass: 19637.695 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) ![]() ![]() Plasmid details: Fission yeast / Strain: 972 / ATCC 24843 / References: UniProt: Q92352 |
#7: Protein | Mass: 16922.059 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) ![]() ![]() Plasmid details: Fission yeast / Strain: 972 / ATCC 24843 / References: UniProt: Q10316 |
-Protein , 2 types, 5 molecules HIJKL
#8: Protein | Mass: 43715.137 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Details: Fission yeast Source: (gene. exp.) ![]() ![]() Strain: 972 / ATCC 24843 / Gene: dip1, SPBC24C6.10c / Plasmid: pGV67-Dip1 / Production host: ![]() ![]() |
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#9: Protein | Mass: 42109.973 Da / Num. of mol.: 4 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
-Protein/peptide , 1 types, 5 molecules MNOPQ
#10: Protein/peptide | Mass: 808.899 Da / Num. of mol.: 5 / Source method: isolated from a natural source / Source: (natural) ![]() |
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-Non-polymers , 3 types, 12 molecules ![](data/chem/img/MG.gif)
![](data/chem/img/ATP.gif)
![](data/chem/img/ADP.gif)
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![](data/chem/img/ADP.gif)
#11: Chemical | ChemComp-MG / #12: Chemical | #13: Chemical | ChemComp-ADP / |
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-Details
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: Complex consisting of actin-filament nucleator, Arp2/3 complex associated with nucleation promoting factor Dip1 and first four actin subunits from the pointed end of the nucleated actin-filament Type: COMPLEX / Entity ID: #1-#10 / Source: NATURAL | ||||||||||||||||||||||||||||||||||||||||
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Molecular weight | Value: 0.446 MDa / Experimental value: NO | ||||||||||||||||||||||||||||||||||||||||
Source (natural) | Organism: ![]() ![]() Strain: 972 / ATCC 24843 | ||||||||||||||||||||||||||||||||||||||||
Buffer solution | pH: 7.5 | ||||||||||||||||||||||||||||||||||||||||
Buffer component |
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Specimen | Conc.: 3 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES | ||||||||||||||||||||||||||||||||||||||||
Specimen support | Details: 20mA current / Grid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil, UltrAuFoil, R1.2/1.3 | ||||||||||||||||||||||||||||||||||||||||
Vitrification | Instrument: HOMEMADE PLUNGER / Cryogen name: ETHANE / Humidity: 98 % / Chamber temperature: 277.15 K |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Talos Arctica / Image courtesy: FEI Company |
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Microscopy | Model: FEI TALOS ARCTICA Details: Data were collected by stage shifting to targeted exposure positions. |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal magnification: 92000 X / Nominal defocus max: -1750 nm / Nominal defocus min: -1000 nm / Cs: 2.7 mm / C2 aperture diameter: 70 µm / Alignment procedure: BASIC |
Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Image recording | Average exposure time: 60 sec. / Electron dose: 36.35 e/Å2 / Detector mode: COUNTING / Film or detector model: FEI FALCON III (4k x 4k) / Num. of grids imaged: 2 / Num. of real images: 5109 Details: Each micrograph was collected as dose-fractionated movies consisting of 45 fractions per movie. |
Image scans | Sampling size: 14 µm / Width: 4000 / Height: 4000 |
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Processing
EM software |
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CTF correction | Details: Particles were CTF corrected during projection matching and back projection. Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Particle selection | Num. of particles selected: 3500000 Details: Particles were picked using Laplacian Gaussian auto-picking. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Symmetry | Point symmetry: C1 (asymmetric) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 3.9 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 110433 / Algorithm: BACK PROJECTION / Num. of class averages: 1 / Symmetry type: POINT | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Atomic model building | Protocol: FLEXIBLE FIT / Space: REAL | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Atomic model building |
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Refinement | Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Displacement parameters | Biso mean: 102.46 Å2 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refine LS restraints |
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