Crystal structure of monomeric FraC (second crystal form)

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.162 
  • R-Value Observed: 0.165 

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This is version 1.4 of the entry. See complete history


Structural basis for self-assembly of a cytolytic pore lined by protein and lipid

Tanaka, K.Caaveiro, J.M.M.Morante, K.Gonzalez-Manas, J.M.Tsumoto, K.

(2015) Nat Commun 6: 6337-6337

  • DOI: https://doi.org/10.1038/ncomms7337
  • Primary Citation of Related Structures:  
    3VWI, 3W9P, 4TSL, 4TSN, 4TSO, 4TSP, 4TSQ, 4TSY

  • PubMed Abstract: 

    Pore-forming toxins (PFT) are water-soluble proteins that possess the remarkable ability to self-assemble on the membrane of target cells, where they form pores causing cell damage. Here, we elucidate the mechanism of action of the haemolytic protein fragaceatoxin C (FraC), a α-barrel PFT, by determining the crystal structures of FraC at four different stages of the lytic mechanism, namely the water-soluble state, the monomeric lipid-bound form, an assembly intermediate and the fully assembled transmembrane pore. The structure of the transmembrane pore exhibits a unique architecture composed of both protein and lipids, with some of the lipids lining the pore wall, acting as assembly cofactors. The pore also exhibits lateral fenestrations that expose the hydrophobic core of the membrane to the aqueous environment. The incorporation of lipids from the target membrane within the structure of the pore provides a membrane-specific trigger for the activation of a haemolytic toxin.

  • Organizational Affiliation

    Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Fragaceatoxin C
A, B
180Actinia fragaceaMutation(s): 0 
Gene Names: FraC
Membrane Entity: Yes 
Find proteins for B9W5G6 (Actinia fragacea)
Explore B9W5G6 
Go to UniProtKB:  B9W5G6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB9W5G6
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.162 
  • R-Value Observed: 0.165 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 58.98α = 90
b = 60.51β = 90
c = 80.84γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
XSCALEdata scaling
PDB_EXTRACTdata extraction
SERGUIdata collection
SCALAdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-04-09
    Type: Initial release
  • Version 1.1: 2015-03-04
    Changes: Database references
  • Version 1.2: 2016-08-03
    Changes: Database references
  • Version 1.3: 2017-11-22
    Changes: Refinement description
  • Version 1.4: 2023-11-08
    Changes: Data collection, Database references, Refinement description