7USD

Cryo-EM structure of D-site Rac1-bound WAVE Regulatory Complex


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Starting Models: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structures reveal a key mechanism of WAVE regulatory complex activation by Rac1 GTPase.

Ding, B.Yang, S.Schaks, M.Liu, Y.Brown, A.J.Rottner, K.Chowdhury, S.Chen, B.

(2022) Nat Commun 13: 5444-5444

  • DOI: https://doi.org/10.1038/s41467-022-33174-3
  • Primary Citation of Related Structures:  
    7USC, 7USD, 7USE

  • PubMed Abstract: 

    The Rho-family GTPase Rac1 activates the WAVE regulatory complex (WRC) to drive Arp2/3 complex-mediated actin polymerization in many essential processes. Rac1 binds to WRC at two distinct sites-the A and D sites. Precisely how Rac1 binds and how the binding triggers WRC activation remain unknown. Here we report WRC structures by itself, and when bound to single or double Rac1 molecules, at ~3 Å resolutions by cryogenic-electron microscopy. The structures reveal that Rac1 binds to the two sites by distinct mechanisms, and binding to the A site, but not the D site, drives WRC activation. Activation involves a series of unique conformational changes leading to the release of sequestered WCA (WH2-central-acidic) polypeptide, which stimulates the Arp2/3 complex to polymerize actin. Together with biochemical and cellular analyses, the structures provide a novel mechanistic understanding of how the Rac1-WRC-Arp2/3-actin signaling axis is regulated in diverse biological processes and diseases.


  • Organizational Affiliation

    Department of Biochemistry and Cell Biology, Stony Brook University, 100 Nicolls Road, Stony Brook, NY, 11794, USA.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cytoplasmic FMR1-interacting protein 11,253Homo sapiensMutation(s): 0 
Gene Names: CYFIP1KIAA0068
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PHAROS:  Q7L576
GTEx:  ENSG00000273749 
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UniProt GroupQ7L576
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Nck-associated protein 11,128Homo sapiensMutation(s): 0 
Gene Names: NCKAP1HEM2KIAA0587NAP1
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PHAROS:  Q9Y2A7
GTEx:  ENSG00000061676 
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UniProt GroupQ9Y2A7
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Wiskott-Aldrich syndrome protein family member 1323Homo sapiensMutation(s): 0 
Gene Names: WASF1KIAA0269SCAR1WAVE1
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GTEx:  ENSG00000112290 
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UniProt GroupQ92558
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Protein BRICK175Homo sapiensMutation(s): 0 
Gene Names: BRK1C3orf10HSPC300MDS027
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GTEx:  ENSG00000254999 
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
Abl interactor 2158Homo sapiensMutation(s): 0 
Gene Names: ABI2
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GTEx:  ENSG00000138443 
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
Ras-related C3 botulinum toxin substrate 1188Homo sapiensMutation(s): 2 
Gene Names: RAC1TC25MIG5
EC: 3.6.5.2
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Find proteins for P63000 (Homo sapiens)
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GTEx:  ENSG00000136238 
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UniProt GroupP63000
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTPHENIX
RECONSTRUCTIONRELION3.1 beta

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2022-09-21
    Type: Initial release
  • Version 1.1: 2022-11-09
    Changes: Database references
  • Version 1.2: 2024-06-12
    Changes: Data collection, Refinement description