1RER

Crystal structure of the homotrimer of fusion glycoprotein E1 from Semliki Forest Virus.

Summary for 1RER

• Entry DOI: 10.2210/pdb1rer/pdb
• Related: 1I9W
• Descriptor: Structural polyprotein, 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-beta-D-mannopyranose-(1-3)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[beta-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose, 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose, ... (8 entities in total)
• Functional Keywords: envelope glycoprotein, membrane fusion, virus., viral protein
• Biological source: Semliki forest virus
• Cellular location: Capsid protein: Virion . p62: Virion membrane ; Single- pass type I membrane protein . Envelope glycoprotein E2: Virion membrane ; Single-pass type I membrane protein . Envelope glycoprotein E1: Virion membrane ; Single-pass type I membrane protein . Protein 6K: Host cell membrane ; Multi-pass membrane protein : P03315
• Total number of polymer chains: 3
• Total formula weight: 131847.35

Authors

Gibbons, D.L.,Vaney, M.C.,Roussel, A.,Vigouroux, A.,Reilly, B.,Kielian, M.,Rey, F.A. (deposition date: 2003-11-07, release date: 2004-01-27, Last modification date: 2024-10-16)

Primary citation

Gibbons, D.L.,Vaney, M.C.,Roussel, A.,Vigouroux, A.,Reilly, B.,Lepault, J.,Kielian, M.,Rey, F.A.
Conformational change and protein-protein interactions of the fusion protein of Semliki Forest virus.
Nature, 427:320-325, 2004

PubMed Abstract: 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.

PubMed: 14737160
DOI: 10.1038/nature02239

Experimental method

X-RAY DIFFRACTION (3.2 Å)