7AQK

Model of the actin filament Arp2/3 complex branch junction in cells

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 9.00 Å
  • Aggregation State: CELL 
  • Reconstruction Method: SUBTOMOGRAM AVERAGING 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history. 


Literature

Cryo-electron tomography structure of Arp2/3 complex in cells reveals new insights into the branch junction.

Fassler, F., Dimchev, G., Hodirnau, V.V., Wan, W., Schur, F.K.M.

(2020) Nat Commun 11: 6437-6437

  • DOI: 10.1038/s41467-020-20286-x
  • Primary Citation of Related Structures:  
    7AQK

  • PubMed Abstract: 

    • The actin-related protein (Arp)2/3 complex nucleates branched actin filament networks pivotal for cell migration, endocytosis and pathogen infection. Its activation is tightly regulated and involves complex structural rearrangements and actin filament binding, which are yet to be understood ...

    The actin-related protein (Arp)2/3 complex nucleates branched actin filament networks pivotal for cell migration, endocytosis and pathogen infection. Its activation is tightly regulated and involves complex structural rearrangements and actin filament binding, which are yet to be understood. Here, we report a 9.0 Å resolution structure of the actin filament Arp2/3 complex branch junction in cells using cryo-electron tomography and subtomogram averaging. This allows us to generate an accurate model of the active Arp2/3 complex in the branch junction and its interaction with actin filaments. Notably, our model reveals a previously undescribed set of interactions of the Arp2/3 complex with the mother filament, significantly different to the previous branch junction model. Our structure also indicates a central role for the ArpC3 subunit in stabilizing the active conformation.

    Organizational Affiliation: 

    Institute of Science and Technology (IST) Austria, Klosterneuburg, Austria. florian.schur@ist.ac.at.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Actin-related protein 2, Arp2A [auth b]394Mus musculusMutation(s): 0 
Gene Names: Actr2, Arp2
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Find proteins for P61161 (Mus musculus)
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Actin-related protein 3, Arp3B [auth a]418Mus musculusMutation(s): 0 
Gene Names: Actr3, Arp3
UniProt
Find proteins for Q99JY9 (Mus musculus)
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Actin-related protein 2/3 complex subunit 1b, ArpC1bC [auth c]372Mus musculusMutation(s): 0 
Gene Names: Arpc1b
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IMPC:  MGI:1343142
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Actin-related protein 2/3 complex subunit 2, ArpC2D [auth d]300Mus musculusMutation(s): 0 
Gene Names: Arpc2
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IMPC:  MGI:1923959
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
Actin-related protein 2/3 complex subunit 3, ArpC3E [auth e]178Mus musculusMutation(s): 0 
Gene Names: Arpc3
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IMPC:  MGI:1928375
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Entity ID: 6
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Actin-related protein 2/3 complex subunit 4, ArpC4F [auth f]168Mus musculusMutation(s): 0 
Gene Names: Arpc4, Arc20
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IMPC:  MGI:1915339
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Entity ID: 7
MoleculeChainsSequence LengthOrganismDetailsImage
Actin-related protein 2/3 complex subunit 5, ArpC5G [auth g]151Mus musculusMutation(s): 0 
Gene Names: Arpc5
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Entity ID: 8
MoleculeChainsSequence LengthOrganismDetailsImage
Actin, alpha skeletal muscle, ACTA1377Mus musculusMutation(s): 0 
Gene Names: Acta1, Acta
UniProt
Find proteins for P68134 (Mus musculus)
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 9.00 Å
  • Aggregation State: CELL 
  • Reconstruction Method: SUBTOMOGRAM AVERAGING 

Structure Validation

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View more in-depth experimental data

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Austrian Science FundAustriaP33367

Revision History  (Full details and data files)

  • Version 1.0: 2020-12-02
    Type: Initial release
  • Version 1.1: 2020-12-30
    Changes: Database references
  • Version 1.2: 2021-01-06
    Changes: Database references