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Structure and Assembly

Molecular Dissection of the Semliki Forest Virus Homotrimer Reveals Two Functionally Distinct Regions of the Fusion Protein

Don L. Gibbons, Margaret Kielian
Don L. Gibbons
Department of Cell Biology, Albert Einstein College of Medicine, Bronx, New York 10461
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Margaret Kielian
Department of Cell Biology, Albert Einstein College of Medicine, Bronx, New York 10461
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  • For correspondence: kielian@aecom.yu.edu
DOI: 10.1128/JVI.76.3.1194-1205.2002
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ABSTRACT

Semliki Forest virus (SFV) is an enveloped alphavirus that infects cells via a membrane fusion reaction triggered by the acidic pH of endosomes. In response to low pH, the E1 proteins on the virus membrane undergo a series of conformational changes, resulting in the formation of a stable E1 homotrimer. Little is known about the structural basis of either the E1 conformational changes or the resulting homotrimer or about the mechanism of action of the homotrimer in fusion. Here, the E1 homotrimer was formed in vitro from either virus or soluble E1 ectodomain and then probed by various perturbants, proteases, or glycosidase. The preformed homotrimer was extremely stable to moderately harsh conditions and proteases. By contrast, mild reducing conditions selectively disrupted the N-terminal region of trimeric E1, making it accessible to proteolytic cleavage and producing E1 fragments that retained trimer interactions. Trypsin digestion produced a fragment missing a portion of the N terminus just proximal to the putative fusion peptide. Digestion with elastase produced several fragments with cleavage sites between residues 78 and 102, resulting in the loss of the putative fusion peptide and the release of membrane-bound E1 ectodomain as a soluble trimer. Elastase also cleaved the homotrimer within an E1 loop located near the fusion peptide in the native E1 structure. Mass spectrometry was used to map the C termini of several differentially produced and fully functional E1 ectodomains. Together, our data identify two separate regions of the SFV E1 ectodomain, one responsible for target membrane association and one necessary for trimer interactions.

  • Copyright © 2002 American Society for Microbiology
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Molecular Dissection of the Semliki Forest Virus Homotrimer Reveals Two Functionally Distinct Regions of the Fusion Protein
Don L. Gibbons, Margaret Kielian
Journal of Virology Feb 2002, 76 (3) 1194-1205; DOI: 10.1128/JVI.76.3.1194-1205.2002

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Molecular Dissection of the Semliki Forest Virus Homotrimer Reveals Two Functionally Distinct Regions of the Fusion Protein
Don L. Gibbons, Margaret Kielian
Journal of Virology Feb 2002, 76 (3) 1194-1205; DOI: 10.1128/JVI.76.3.1194-1205.2002
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KEYWORDS

Membrane Glycoproteins
Semliki Forest virus
Viral Envelope Proteins
Viral Fusion Proteins

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