Conformational change and protein-protein interactions of the fusion protein of Semliki Forest virus.Gibbons, D.L., Vaney, M.C., Roussel, A., Vigouroux, A., Reilly, B., Lepault, J., Kielian, M., Rey, F.A.
(2004) Nature 427: 320-325
- PubMed: 14737160
- DOI: 10.1038/nature02239
- Primary Citation of Related Structures:
- PubMed Abstract:
- THE FUSION GLYCOPROTEIN SHELL OF SEMLIKI FOREST
VIRUS: AN ICOSAHEDRAL ASSEMBLY PRIMED FOR
FUSOGENIC ACTIVATION AT ENDOSOMAL PH
LESCAR, J., ROUSSEL, A., WIEN, M.W., NAVAZA, J., FULLER, S.D., WENGLER, G., REY, F.A.
(2001) Cell 105: 137
- Visualization of the target-membrane-inserted fusion protein of Semliki Forest virus
by combined electron microscopy and crystallography.
Gibbons, D.L., Erk, I., Reilly, B., Navaza, J., Kielian, M., Rey, F.A., Lepault, J.
(2003) Cell 114: 573
- Molecular dissection of the Semliki Forest virus homotrimer reveals two functionally
distinct regions of the fusion protein.
Gibbons, D.L., Lepault, J.
(2002) J Virol 76: 1194
Fusion of biological membranes is mediated by specific lipid-interacting proteins that induce the formation and expansion of an initial fusion pore. Here we report the crystal structure of the ectodomain of the Semliki Forest virus fusion glycoprotein E1 in its low-pH-induced trimeric form ...
Fusion of biological membranes is mediated by specific lipid-interacting proteins that induce the formation and expansion of an initial fusion pore. Here we report the crystal structure of the ectodomain of the Semliki Forest virus fusion glycoprotein E1 in its low-pH-induced trimeric form. E1 adopts a folded-back conformation that, in the final post-fusion form of the full-length protein, would bring the fusion peptide loop and the transmembrane anchor to the same end of a stable protein rod. The observed conformation of the fusion peptide loop is compatible with interactions only with the outer leaflet of the lipid bilayer. Crystal contacts between fusion peptide loops of adjacent E1 trimers, together with electron microscopy observations, suggest that in an early step of membrane fusion, an intermediate assembly of five trimers creates two opposing nipple-like deformations in the viral and target membranes, leading to formation of the fusion pore.
Virologie Moléculaire & Structurale, UMR 2472/1157 CNRS-INRA, 1 Avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, France.