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Review
. 2015 Apr:11:70-5.
doi: 10.1016/j.coviro.2015.03.002. Epub 2015 Mar 26.

Neutralizing epitopes on the respiratory syncytial virus fusion glycoprotein

Affiliations
Review

Neutralizing epitopes on the respiratory syncytial virus fusion glycoprotein

Jason S McLellan. Curr Opin Virol. 2015 Apr.

Abstract

Respiratory syncytial virus (RSV) is a leading cause of pneumonia and bronchiolitis, but despite decades of research a safe and effective vaccine has remained elusive. The viral fusion glycoprotein (RSV F) plays an obligatory role in the entry process and is the major target of neutralizing antibodies, making it an attractive target for vaccine development. This review will summarize the recently determined structures of RSV F in the prefusion and postfusion conformations and describe the location and properties of neutralizing epitopes on RSV F, including the newly identified prefusion-specific epitopes. The influence of these findings on vaccine development will also be discussed, with a focus on the rational design and optimization of vaccine antigens.

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Figures

Figure 1
Figure 1
Conformations of the RSV F ectodomain. (a) Structures of trimeric RSV F in the prefusion (left) and postfusion (right) conformations. A molecular surface is shown for two of the protomers, colored gray and white, whereas the third protomer is displayed as a ribbon with F2 colored blue and F1 colored green. The fusion peptide (FP) is colored red and is shown with a transparent molecular surface. (b) Structures of RSV F protomers in the prefusion (left) and postfusion (right) conformations. Secondary structure elements that exist in substantially different orientations, conformations, or both are uniquely colored. The first 10 amino acids of the fusion peptide are not present in the postfusion structure.
Figure 2
Figure 2
Neutralizing epitopes on RSV F. For the pre- and postfusion RSV F trimers, a molecular surface is shown for two of the protomers, colored gray and white, whereas the third protomer is displayed as a green ribbon with residues that are displaced by more than 5 Å between the structures colored blue. Antigen-binding fragments (Fabs) for antibodies D25, motavizumab and 101F are shown as ribbons, with the heavy chains colored darker than the light chains.

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