8P94

Cryo-EM structure of cortactin stabilized Arp2/3-complex nucleated actin branches


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Starting Model: in silico
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This is version 1.3 of the entry. See complete history


Literature

Cortactin stabilizes actin branches by bridging activated Arp2/3 to its nucleated actin filament.

Liu, T.Cao, L.Mladenov, M.Jegou, A.Way, M.Moores, C.A.

(2024) Nat Struct Mol Biol 31: 801-809

  • DOI: https://doi.org/10.1038/s41594-023-01205-2
  • Primary Citation of Related Structures:  
    8P94

  • PubMed Abstract: 

    Regulation of the assembly and turnover of branched actin filament networks nucleated by the Arp2/3 complex is essential during many cellular processes, including cell migration and membrane trafficking. Cortactin is important for actin branch stabilization, but the mechanism by which this occurs is unclear. Given this, we determined the structure of vertebrate cortactin-stabilized Arp2/3 actin branches using cryogenic electron microscopy. We find that cortactin interacts with the new daughter filament nucleated by the Arp2/3 complex at the branch site, rather than the initial mother actin filament. Cortactin preferentially binds activated Arp3. It also stabilizes the F-actin-like interface of activated Arp3 with the first actin subunit of the new filament, and its central repeats extend along successive daughter-filament subunits. The preference of cortactin for activated Arp3 explains its retention at the actin branch and accounts for its synergy with other nucleation-promoting factors in regulating branched actin network dynamics.


  • Organizational Affiliation

    Institute of Structural and Molecular Biology, Birkbeck College, London, UK.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Actin-related protein 3418Homo sapiensMutation(s): 0 
Gene Names: ACTR3ARP3
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PHAROS:  P61158
GTEx:  ENSG00000115091 
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UniProt GroupP61158
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Actin-related protein 2394Homo sapiensMutation(s): 0 
Gene Names: ACTR2ARP2
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Find proteins for P61160 (Homo sapiens)
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PHAROS:  P61160
GTEx:  ENSG00000138071 
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UniProt GroupP61160
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Actin-related protein 2/3 complex subunit 1B372Homo sapiensMutation(s): 0 
Gene Names: ARPC1BARC41
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PHAROS:  O15143
GTEx:  ENSG00000130429 
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UniProt GroupO15143
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Actin-related protein 2/3 complex subunit 2300Homo sapiensMutation(s): 0 
Gene Names: ARPC2ARC34PRO2446
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PHAROS:  O15144
GTEx:  ENSG00000163466 
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UniProt GroupO15144
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
Actin-related protein 2/3 complex subunit 3178Homo sapiensMutation(s): 0 
Gene Names: ARPC3ARC21
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PHAROS:  O15145
GTEx:  ENSG00000111229 
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
Actin-related protein 2/3 complex subunit 4168Homo sapiensMutation(s): 0 
Gene Names: ARPC4ARC20
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PHAROS:  P59998
GTEx:  ENSG00000241553 
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Entity ID: 7
MoleculeChains Sequence LengthOrganismDetailsImage
Actin-related protein 2/3 complex subunit 5-like protein153Homo sapiensMutation(s): 0 
Gene Names: ARPC5L
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PHAROS:  Q9BPX5
GTEx:  ENSG00000136950 
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Entity ID: 8
MoleculeChains Sequence LengthOrganismDetailsImage
Actin, cytoplasmic 1375Sus scrofaMutation(s): 0 
EC: 3.6.4
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Entity ID: 9
MoleculeChains Sequence LengthOrganismDetailsImage
Src substrate cortactin546Mus musculusMutation(s): 0 
Gene Names: CttnEms1
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IMPC:  MGI:99695
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Entity ID: 10
MoleculeChains Sequence LengthOrganismDetailsImage
F-actin-capping protein subunit alpha-1R [auth U]286Mus musculusMutation(s): 0 
Gene Names: Capza1Cappa1
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IMPC:  MGI:106227
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Entity ID: 11
MoleculeChains Sequence LengthOrganismDetailsImage
Isoform 2 of F-actin-capping protein subunit betaS [auth V]272Mus musculusMutation(s): 0 
Gene Names: CapzbCappb1
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IMPC:  MGI:104652
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Entity ID: 12
MoleculeChains Sequence LengthOrganismDetailsImage
Phalloidin7Amanita phalloidesMutation(s): 0 
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
ADP (Subject of Investigation/LOI)
Query on ADP

Download Ideal Coordinates CCD File 
AB [auth W]
EA [auth A]
GA [auth B]
IA [auth H]
KA [auth J]
ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N
MG (Subject of Investigation/LOI)
Query on MG

Download Ideal Coordinates CCD File 
BB [auth W]
FA [auth A]
HA [auth B]
JA [auth H]
LA [auth J]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
HYP
Query on HYP
AA [auth j]
BA [auth k]
CA [auth l]
DA [auth m]
U [auth a]
AA [auth j],
BA [auth k],
CA [auth l],
DA [auth m],
U [auth a],
V [auth b],
W [auth c],
X [auth d],
Y [auth h],
Z [auth i]
L-PEPTIDE LINKINGC5 H9 N O3PRO
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTISOLDE
MODEL REFINEMENTISOLDE
MODEL REFINEMENTCoot
RECONSTRUCTIONcryoSPARC

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
European Research Council (ERC)European Union810207

Revision History  (Full details and data files)

  • Version 1.0: 2024-01-03
    Type: Initial release
  • Version 1.1: 2024-01-31
    Changes: Database references
  • Version 1.2: 2024-02-07
    Changes: Database references
  • Version 1.3: 2024-05-29
    Changes: Database references