4OJC

Crystal structure of the wild-type full-length trimeric ectodomain of the C. elegans fusion protein EFF-1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.93 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.223 

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Ligand Structure Quality Assessment 


This is version 2.0 of the entry. See complete history


Literature

Structural basis of eukaryotic cell-cell fusion

Perez-Vargas, J.Krey, T.Valansi, C.Avinoam, O.Haouz, A.Jamin, M.Raveh-Barak, H.Podbilewicz, B.Rey, F.A.

(2014) Cell 157: 407-419

  • DOI: 10.1016/j.cell.2014.02.020
  • Primary Citation of Related Structures:  
    4OJC, 4OJD, 4OJE

  • PubMed Abstract: 
  • Cell-cell fusion proteins are essential in development. Here we show that the C. elegans cell-cell fusion protein EFF-1 is structurally homologous to viral class II fusion proteins. The 2.6 Å crystal structure of the EFF-1 trimer displays the same 3D fold and quaternary conformation of postfusion class II viral fusion proteins, although it lacks a nonpolar "fusion loop," indicating that it does not insert into the target membrane ...

    Cell-cell fusion proteins are essential in development. Here we show that the C. elegans cell-cell fusion protein EFF-1 is structurally homologous to viral class II fusion proteins. The 2.6 Å crystal structure of the EFF-1 trimer displays the same 3D fold and quaternary conformation of postfusion class II viral fusion proteins, although it lacks a nonpolar "fusion loop," indicating that it does not insert into the target membrane. EFF-1 was previously shown to be required in both cells for fusion, and we show that blocking EFF-1 trimerization blocks the fusion reaction. Together, these data suggest that whereas membrane fusion driven by viral proteins entails leveraging of a nonpolar loop, EFF-1-driven fusion of cells entails trans-trimerization such that transmembrane segments anchored in the two opposing membranes are brought into contact at the tip of the EFF-1 trimer to then, analogous to SNARE-mediated vesicle fusion, zip the two membranes into one.


    Organizational Affiliation

    Institut Pasteur, Unité de Virologie Structurale, 25-28 Rue du Docteur Roux, 75724 Paris Cedex 15, France; CNRS UMR 3569, 25-28 Rue du Docteur Roux, 75724 Paris Cedex 15, France. Electronic address: rey@pasteur.fr.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
EFF-1AA580Caenorhabditis elegansMutation(s): 0 
Gene Names: C26D10.5CELE_C26D10.5eff-1
UniProt
Find proteins for G5ECA1 (Caenorhabditis elegans)
Explore G5ECA1 
Go to UniProtKB:  G5ECA1
Protein Feature View
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseB2N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.93 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.223 
  • Space Group: I 21 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 173.698α = 90
b = 173.698β = 90
c = 173.698γ = 90
Software Package:
Software NamePurpose
XDSdata scaling
SHARPphasing
BUSTERrefinement
XDSdata reduction
SCALAdata scaling

Structure Validation

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Ligand Structure Quality Assessment  



Entry History 

Deposition Data

  • Deposited Date: 2014-01-21 
  • Released Date: 2014-05-14 
  • Deposition Author(s): Krey, T., Rey, F.A.

Revision History  (Full details and data files)

  • Version 1.0: 2014-05-14
    Type: Initial release
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Database references, Derived calculations, Structure summary