7ZCG

CHMP2A-CHMP3 heterodimer (430 Angstrom diameter)


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural basis of CHMP2A-CHMP3 ESCRT-III polymer assembly and membrane cleavage.

Azad, K.Guilligay, D.Boscheron, C.Maity, S.De Franceschi, N.Sulbaran, G.Effantin, G.Wang, H.Kleman, J.P.Bassereau, P.Schoehn, G.Roos, W.H.Desfosses, A.Weissenhorn, W.

(2023) Nat Struct Mol Biol 30: 81-90

  • DOI: https://doi.org/10.1038/s41594-022-00867-8
  • Primary Citation of Related Structures:  
    7ZCG, 7ZCH

  • PubMed Abstract: 

    The endosomal sorting complex required for transport (ESCRT) is a highly conserved protein machinery that drives a divers set of physiological and pathological membrane remodeling processes. However, the structural basis of ESCRT-III polymers stabilizing, constricting and cleaving negatively curved membranes is yet unknown. Here we present cryo-EM structures of membrane-coated CHMP2A-CHMP3 filaments from Homo sapiens of two different diameters at 3.3 and 3.6 Å resolution. The structures reveal helical filaments assembled by CHMP2A-CHMP3 heterodimers in the open ESCRT-III conformation, which generates a partially positive charged membrane interaction surface, positions short N-terminal motifs for membrane interaction and the C-terminal VPS4 target sequence toward the tube interior. Inter-filament interactions are electrostatic, which may facilitate filament sliding upon VPS4-mediated polymer remodeling. Fluorescence microscopy as well as high-speed atomic force microscopy imaging corroborate that VPS4 can constrict and cleave CHMP2A-CHMP3 membrane tubes. We therefore conclude that CHMP2A-CHMP3-VPS4 act as a minimal membrane fission machinery.


  • Organizational Affiliation

    Institute of Structural Biology (IBS), University Grenoble Alpes, CEA, CNRS, Grenoble, France.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Charged multivesicular body protein 2aA [auth B]147Homo sapiensMutation(s): 0 
Gene Names: CHMP2ABC2CHMP2
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for O43633 (Homo sapiens)
Explore O43633 
Go to UniProtKB:  O43633
PHAROS:  O43633
GTEx:  ENSG00000130724 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO43633
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Charged multivesicular body protein 3B [auth A]159Homo sapiensMutation(s): 0 
Gene Names: CHMP3CGI149NEDFVPS24CGI-149
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q9Y3E7 (Homo sapiens)
Explore Q9Y3E7 
Go to UniProtKB:  Q9Y3E7
PHAROS:  Q9Y3E7
GTEx:  ENSG00000115561 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9Y3E7
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONRELION3
MODEL REFINEMENTCoot
MODEL REFINEMENTPHENIX

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Agence Nationale de la Recherche (ANR)FranceANR-14-CE09-0003-01
Agence Nationale de la Recherche (ANR)FranceANR-19-CE11-0002-02
Agence Nationale de la Recherche (ANR)FranceANR-17-EURE-0003

Revision History  (Full details and data files)

  • Version 1.0: 2023-01-18
    Type: Initial release
  • Version 1.1: 2023-02-01
    Changes: Database references
  • Version 1.2: 2024-07-24
    Changes: Data collection, Refinement description