Tomographic subvolume average of EFF-1 fusogen on extracellular vesicles

Experimental Data Snapshot

  • Resolution: 22.2 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: TOMOGRAPHY 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


The Full-Length Cell-Cell Fusogen Eff-1 is Monomeric and Upright on the Membrane.

Zeev-Ben-Mordehai, T.Vasishtan, D.Siebert, C.A.Grunewald, K.

(2014) Nat Commun 5: 3912

  • DOI: https://doi.org/10.1038/ncomms4912
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Fusogens are membrane proteins that remodel lipid bilayers to facilitate membrane merging. Although several fusogen ectodomain structures have been solved, structural information on full-length, natively membrane-anchored fusogens is scarce. Here we present the electron cryo microscopy three-dimensional reconstruction of the Caenorhabditis elegans epithelial fusion failure 1 (EFF-1) protein natively anchored in cell-derived membrane vesicles. This reveals a membrane protruding, asymmetric, elongated monomer. Flexible fitting of a protomer of the EFF-1 crystal structure, which is homologous to viral class-II fusion proteins, shows that EFF-1 has a hairpin monomeric conformation before fusion. These structural insights, when combined with our observations of membrane-merging intermediates between vesicles, enable us to propose a model for EFF-1 mediated fusion. This process, involving identical proteins on both membranes to be fused, follows a mechanism that shares features of SNARE-mediated fusion while using the structural building blocks of the unilaterally acting class-II viral fusion proteins.

  • Organizational Affiliation

    Oxford Particle Imaging Centre, Division of Structural Biology, Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford OX3 7BN, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
EFF-1A658Caenorhabditis elegansMutation(s): 0 
Find proteins for G5ECA1 (Caenorhabditis elegans)
Explore G5ECA1 
Go to UniProtKB:  G5ECA1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupG5ECA1
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 22.2 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: TOMOGRAPHY 
EM Software:
TaskSoftware PackageVersion

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-06-04
    Type: Initial release
  • Version 1.1: 2014-07-30
    Changes: Database references
  • Version 1.2: 2017-08-23
    Changes: Data collection