7AQK image
Deposition Date 2020-10-22
Release Date 2020-12-02
Last Version Date 2024-05-01
Entry Detail
PDB ID:
7AQK
Keywords:
STRUCTURAL PROTEIN
Title:
Model of the actin filament Arp2/3 complex branch junction in cells
Biological Source:
Source Organism:
Mus musculus (Taxon ID: 10090)
Method Details:
Experimental Method:
ELECTRON MICROSCOPY
Resolution:
9.00 Å
Aggregation State:
CELL
Reconstruction Method:
SUBTOMOGRAM AVERAGING
7AQK validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Actin-related protein 3, Arp3
Mutations:From Bos taurus to Mus Musculus I259V
Chain IDs:B (auth: a)
Chain Length:418
Number of Molecules:1
Biological Source:Mus musculus
UniProt ID:Q99JY9 Pfam ID:PF00022
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Actin-related protein 2, Arp2
Chain IDs:A (auth: b)
Chain Length:394
Number of Molecules:1
Biological Source:Mus musculus
UniProt ID:P61161 Pfam ID:PF00022
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Actin-related protein 2/3 complex subunit 1b, ArpC1b
Mutations:From Bos taurus to Mus Musculus V43N, Q44K, V58I, D63E, K109N, S154N, N213S, A229V, S256N, S274N, G277V, K278T, L296M, S313G, A216T, R360K
Chain IDs:C (auth: c)
Chain Length:372
Number of Molecules:1
Biological Source:Mus musculus
UniProt ID:Q9WV32 Pfam ID:PF00400
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Actin-related protein 2/3 complex subunit 2, ArpC2
Mutations:From Bos taurus to Mus Musculus Y84F, S90P
Chain IDs:D (auth: d)
Chain Length:300
Number of Molecules:1
Biological Source:Mus musculus
UniProt ID:Q9CVB6 Pfam ID:PF04045
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Actin-related protein 2/3 complex subunit 3, ArpC3
Mutations:From Bos taurus to Mus Musculus I24L
Chain IDs:E (auth: e)
Chain Length:178
Number of Molecules:1
Biological Source:Mus musculus
UniProt ID:Q9JM76 Pfam ID:PF04062
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Actin-related protein 2/3 complex subunit 4, ArpC4
Chain IDs:F (auth: f)
Chain Length:168
Number of Molecules:1
Biological Source:Mus musculus
UniProt ID:P59999 Pfam ID:PF05856
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Actin-related protein 2/3 complex subunit 5, ArpC5
Mutations:From Bos taurus to Mus Musculus D28E
Chain IDs:G (auth: g)
Chain Length:151
Number of Molecules:1
Biological Source:Mus musculus
UniProt ID:Q9CPW4 Pfam ID:PF04699
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Actin, alpha skeletal muscle, ACTA1
Chain IDs:H (auth: h), I (auth: i), J (auth: j), K (auth: k), L (auth: l), M (auth: m), N (auth: n), O (auth: o), P (auth: p), Q (auth: q), R (auth: r)
Chain Length:377
Number of Molecules:11
Biological Source:Mus musculus
UniProt ID:P68134 Pfam ID:PF00022
Ligand Molecules
NA
Primary Citation
Cryo-electron tomography structure of Arp2/3 complex in cells reveals new insights into the branch junction.
Nat Commun 11 6437 6437 (2020)
PMID: 33353942 DOI: 10.1038/s41467-020-20286-x

Abstact

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.

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Primary Citation of related structures
7AQK