Two distinct trimeric conformations of natively membrane-anchored full-length herpes simplex virus 1 glycoprotein B
Many viruses are enveloped by a lipid bilayer acquired during assembly, which is typically studded with one or two types of glycoproteins. These viral surface proteins act as the primary interface between the virus and the host. Entry of enveloped viruses relies on specialized fusogen proteins to he...
| Main Authors: | , , , , , , , , |
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| Format: | Journal article |
| Published: |
National Academy of Sciences
2016
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| _version_ | 1797059749244567552 |
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| author | Zeev-Ben-Mordehai, T Vasishtan, D Durán, A Vollmer, B White, P Pandurangan, A Siebert, C Topf, M Grünewald, K |
| author_facet | Zeev-Ben-Mordehai, T Vasishtan, D Durán, A Vollmer, B White, P Pandurangan, A Siebert, C Topf, M Grünewald, K |
| author_sort | Zeev-Ben-Mordehai, T |
| collection | OXFORD |
| description | Many viruses are enveloped by a lipid bilayer acquired during assembly, which is typically studded with one or two types of glycoproteins. These viral surface proteins act as the primary interface between the virus and the host. Entry of enveloped viruses relies on specialized fusogen proteins to help merge the virus membrane with the host membrane. In the multicomponent herpesvirus fusion machinery, glycoprotein B (gB) acts as this fusogen. Although the structure of the gB ectodomain postfusion conformation has been determined, any other conformations (e.g., prefusion, intermediate conformations) have so far remained elusive, thus restricting efforts to develop antiviral treatments and prophylactic vaccines. Here, we have characterized the full-length herpes simplex virus 1 gB in a native membrane by displaying it on cell-derived vesicles and using electron cryotomography. Alongside the known postfusion conformation, a novel one was identified. Its structure, in the context of the membrane, was determined by subvolume averaging and found to be trimeric like the postfusion conformation, but appeared more condensed. Hierarchical constrained density-fitting of domains unexpectedly revealed the fusion loops in this conformation to be apart and pointing away from the anchoring membrane. This vital observation is a substantial step forward in understanding the complex herpesvirus fusion mechanism, and opens up new opportunities for more targeted intervention of herpesvirus entry. |
| first_indexed | 2024-03-06T20:08:39Z |
| format | Journal article |
| id | oxford-uuid:29cb47f4-c532-4f01-a880-02ffe2733efc |
| institution | University of Oxford |
| last_indexed | 2024-03-06T20:08:39Z |
| publishDate | 2016 |
| publisher | National Academy of Sciences |
| record_format | dspace |
| spelling | oxford-uuid:29cb47f4-c532-4f01-a880-02ffe2733efc2022-03-26T12:21:14ZTwo distinct trimeric conformations of natively membrane-anchored full-length herpes simplex virus 1 glycoprotein BJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:29cb47f4-c532-4f01-a880-02ffe2733efcSymplectic Elements at OxfordNational Academy of Sciences2016Zeev-Ben-Mordehai, TVasishtan, DDurán, AVollmer, BWhite, PPandurangan, ASiebert, CTopf, MGrünewald, KMany viruses are enveloped by a lipid bilayer acquired during assembly, which is typically studded with one or two types of glycoproteins. These viral surface proteins act as the primary interface between the virus and the host. Entry of enveloped viruses relies on specialized fusogen proteins to help merge the virus membrane with the host membrane. In the multicomponent herpesvirus fusion machinery, glycoprotein B (gB) acts as this fusogen. Although the structure of the gB ectodomain postfusion conformation has been determined, any other conformations (e.g., prefusion, intermediate conformations) have so far remained elusive, thus restricting efforts to develop antiviral treatments and prophylactic vaccines. Here, we have characterized the full-length herpes simplex virus 1 gB in a native membrane by displaying it on cell-derived vesicles and using electron cryotomography. Alongside the known postfusion conformation, a novel one was identified. Its structure, in the context of the membrane, was determined by subvolume averaging and found to be trimeric like the postfusion conformation, but appeared more condensed. Hierarchical constrained density-fitting of domains unexpectedly revealed the fusion loops in this conformation to be apart and pointing away from the anchoring membrane. This vital observation is a substantial step forward in understanding the complex herpesvirus fusion mechanism, and opens up new opportunities for more targeted intervention of herpesvirus entry. |
| spellingShingle | Zeev-Ben-Mordehai, T Vasishtan, D Durán, A Vollmer, B White, P Pandurangan, A Siebert, C Topf, M Grünewald, K Two distinct trimeric conformations of natively membrane-anchored full-length herpes simplex virus 1 glycoprotein B |
| title | Two distinct trimeric conformations of natively membrane-anchored full-length herpes simplex virus 1 glycoprotein B |
| title_full | Two distinct trimeric conformations of natively membrane-anchored full-length herpes simplex virus 1 glycoprotein B |
| title_fullStr | Two distinct trimeric conformations of natively membrane-anchored full-length herpes simplex virus 1 glycoprotein B |
| title_full_unstemmed | Two distinct trimeric conformations of natively membrane-anchored full-length herpes simplex virus 1 glycoprotein B |
| title_short | Two distinct trimeric conformations of natively membrane-anchored full-length herpes simplex virus 1 glycoprotein B |
| title_sort | two distinct trimeric conformations of natively membrane anchored full length herpes simplex virus 1 glycoprotein b |
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