Structural insight into rabies virus neutralization revealed by an engineered antibody scaffold
Kedari, Ashwini; Iheozor-Ejiofor, Rommel; Salminen, Petja; Uğurlu, Hasan; Mäkelä, Anna R; Levanov, Lev; Vapalahti, Olli; Hytönen, Vesa P; Saksela, Kalle; Rissanen, Ilona (2024-10-28)
Elsevier
28.10.2024
Ashwini Kedari, Rommel Iheozor-Ejiofor, Petja Salminen, Hasan Uğurlu, Anna R. Mäkelä, Lev Levanov, Olli Vapalahti, Vesa P. Hytönen, Kalle Saksela, Ilona Rissanen, Structural insight into rabies virus neutralization revealed by an engineered antibody scaffold, Structure, Volume 32, Issue 12, 2024, Pages 2220-2230.e4, ISSN 0969-2126, https://doi.org/10.1016/j.str.2024.10.002
https://creativecommons.org/licenses/by/4.0/
© 2024 The Author(s). Published by Elsevier Inc. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
https://creativecommons.org/licenses/by/4.0/
© 2024 The Author(s). Published by Elsevier Inc. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
https://creativecommons.org/licenses/by/4.0/
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:oulu-202411016569
https://urn.fi/URN:NBN:fi:oulu-202411016569
Tiivistelmä
Summary
Host-cell entry of the highly pathogenic rabies virus (RABV) is mediated by glycoprotein (G) spikes, which also comprise the primary target for the humoral immune response. RABV glycoprotein (RABV-G) displays several antigenic sites that are targeted by neutralizing monoclonal antibodies (mAbs). In this study, we determined the epitope of a potently neutralizing human mAb, CR57, which we engineered into a diabody format to facilitate crystallization. We report the crystal structure of the CR57 diabody alone at 2.38 Å resolution, and in complex with RABV-G domain III at 2.70 Å resolution. The CR57−RABV-G structure reveals critical interactions at the antigen interface, which target the conserved “KLCGVL” peptide and residues proximal to it on RABV-G. Structural analysis combined with a cell-cell fusion assay demonstrates that CR57 effectively inhibits RABV-G-mediated fusion by obstructing the fusogenic transitions of the spike protein. Altogether, this investigation provides a structural perspective on RABV inhibition by a potently neutralizing human antibody.
Host-cell entry of the highly pathogenic rabies virus (RABV) is mediated by glycoprotein (G) spikes, which also comprise the primary target for the humoral immune response. RABV glycoprotein (RABV-G) displays several antigenic sites that are targeted by neutralizing monoclonal antibodies (mAbs). In this study, we determined the epitope of a potently neutralizing human mAb, CR57, which we engineered into a diabody format to facilitate crystallization. We report the crystal structure of the CR57 diabody alone at 2.38 Å resolution, and in complex with RABV-G domain III at 2.70 Å resolution. The CR57−RABV-G structure reveals critical interactions at the antigen interface, which target the conserved “KLCGVL” peptide and residues proximal to it on RABV-G. Structural analysis combined with a cell-cell fusion assay demonstrates that CR57 effectively inhibits RABV-G-mediated fusion by obstructing the fusogenic transitions of the spike protein. Altogether, this investigation provides a structural perspective on RABV inhibition by a potently neutralizing human antibody.
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