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

Nat Commun. 2015 Feb 26;6:6337. doi: 10.1038/ncomms7337.


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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Cnidarian Venoms / chemistry*
  • Cnidarian Venoms / genetics
  • Cnidarian Venoms / toxicity
  • Hemolytic Agents / chemistry*
  • Hemolytic Agents / toxicity
  • Lipids
  • Mutation
  • Protein Conformation


  • Cnidarian Venoms
  • Hemolytic Agents
  • Lipids
  • fragaceatoxin C

Associated data

  • PDB/3VWI
  • PDB/3W9P
  • PDB/4TSL
  • PDB/4TSN
  • PDB/4TSO
  • PDB/4TSP
  • PDB/4TSQ
  • PDB/4TSY