Molecular assembly of the aerolysin pore reveals a swirling membrane-insertion mechanism.Degiacomi, M.T., Iacovache, I., Pernot, L., Chami, M., Kudryashev, M., Stahlberg, H., van der Goot, F.G., Dal Peraro, M.
(2013) Nat.Chem.Biol. 9: 623-629
- PubMed: 23912165
- DOI: 10.1038/nchembio.1312
- Primary Citation of Related Structures:
- PubMed Abstract:
- Crystallization of a proform of aerolysin, a hole-forming toxin from Aeromonas hydrophila.
Tucker, A.D.,Parker, M.W.,Tsernoglou, D.,Buckley, J.T.
(1990) J.Mol.Biol. 212: 561
- Structure of the Aeromonas toxin proaerolysin in its water-soluble and membrane-channel states.
Parker, M.W.,Buckley, J.T.,Postma, J.P.,Tucker, A.D.,Leonard, K.,Pattus, F.,Tsernoglou, D.
(1994) Nature 367: 292
Aerolysin is the founding member of a superfamily of β-pore-forming toxins whose pore structure is unknown. We have combined X-ray crystallography, cryo-EM, molecular dynamics and computational modeling to determine the structures of aerolysin mutant ...
Aerolysin is the founding member of a superfamily of β-pore-forming toxins whose pore structure is unknown. We have combined X-ray crystallography, cryo-EM, molecular dynamics and computational modeling to determine the structures of aerolysin mutants in their monomeric and heptameric forms, trapped at various stages of the pore formation process. A dynamic modeling approach based on swarm intelligence was applied, whereby the intrinsic flexibility of aerolysin extracted from new X-ray structures was used to fully exploit the cryo-EM spatial restraints. Using this integrated strategy, we obtained a radically new arrangement of the prepore conformation and a near-atomistic structure of the aerolysin pore, which is fully consistent with all of the biochemical data available so far. Upon transition from the prepore to pore, the aerolysin heptamer shows a unique concerted swirling movement, accompanied by a vertical collapse of the complex, ultimately leading to the insertion of a transmembrane β-barrel.
1] Institute of Bioengineering, School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland.  .