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Extensive flavivirus E trimer breathing accompanies stem zippering of the post‐fusion hairpin

Flaviviruses enter cells by fusion with endosomal membranes through a rearrangement of the envelope protein E, a class II membrane fusion protein, into fusogenic trimers. The rod‐like E subunits bend into “hairpins” to bring the fusion loops next to the C‐terminal transmembrane (TM) anchors, with th...

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Autores principales: Medits, Iris, Vaney, Marie‐Christine, Rouvinski, Alexander, Rey, Martial, Chamot‐Rooke, Julia, Rey, Felix A, Heinz, Franz X, Stiasny, Karin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7403712/
https://www.ncbi.nlm.nih.gov/pubmed/32484292
http://dx.doi.org/10.15252/embr.202050069
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author Medits, Iris
Vaney, Marie‐Christine
Rouvinski, Alexander
Rey, Martial
Chamot‐Rooke, Julia
Rey, Felix A
Heinz, Franz X
Stiasny, Karin
author_facet Medits, Iris
Vaney, Marie‐Christine
Rouvinski, Alexander
Rey, Martial
Chamot‐Rooke, Julia
Rey, Felix A
Heinz, Franz X
Stiasny, Karin
author_sort Medits, Iris
collection PubMed
description Flaviviruses enter cells by fusion with endosomal membranes through a rearrangement of the envelope protein E, a class II membrane fusion protein, into fusogenic trimers. The rod‐like E subunits bend into “hairpins” to bring the fusion loops next to the C‐terminal transmembrane (TM) anchors, with the TM‐proximal “stem” element zippering the E trimer to force apposition of the membranes. The structure of the complete class II trimeric hairpin is known for phleboviruses but not for flaviviruses, for which the stem is only partially resolved. Here, we performed comparative analyses of E‐protein trimers from the tick‐borne encephalitis flavivirus with sequential stem truncations. Our thermostability and antibody‐binding data suggest that the stem “zipper” ends at a characteristic flavivirus conserved sequence (CS) that cloaks the fusion loops, with the downstream segment not contributing to trimer stability. We further identified a highly dynamic behavior of E trimers C‐terminally truncated upstream the CS, which, unlike fully stem‐zippered trimers, undergo rapid deuterium exchange at the trimer interface. These results thus identify important “breathing” intermediates in the E‐protein‐driven membrane fusion process.
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spelling pubmed-74037122020-08-06 Extensive flavivirus E trimer breathing accompanies stem zippering of the post‐fusion hairpin Medits, Iris Vaney, Marie‐Christine Rouvinski, Alexander Rey, Martial Chamot‐Rooke, Julia Rey, Felix A Heinz, Franz X Stiasny, Karin EMBO Rep Articles Flaviviruses enter cells by fusion with endosomal membranes through a rearrangement of the envelope protein E, a class II membrane fusion protein, into fusogenic trimers. The rod‐like E subunits bend into “hairpins” to bring the fusion loops next to the C‐terminal transmembrane (TM) anchors, with the TM‐proximal “stem” element zippering the E trimer to force apposition of the membranes. The structure of the complete class II trimeric hairpin is known for phleboviruses but not for flaviviruses, for which the stem is only partially resolved. Here, we performed comparative analyses of E‐protein trimers from the tick‐borne encephalitis flavivirus with sequential stem truncations. Our thermostability and antibody‐binding data suggest that the stem “zipper” ends at a characteristic flavivirus conserved sequence (CS) that cloaks the fusion loops, with the downstream segment not contributing to trimer stability. We further identified a highly dynamic behavior of E trimers C‐terminally truncated upstream the CS, which, unlike fully stem‐zippered trimers, undergo rapid deuterium exchange at the trimer interface. These results thus identify important “breathing” intermediates in the E‐protein‐driven membrane fusion process. John Wiley and Sons Inc. 2020-06-02 2020-08-05 /pmc/articles/PMC7403712/ /pubmed/32484292 http://dx.doi.org/10.15252/embr.202050069 Text en © 2020 The Authors. Published under the terms of the CC BY 4.0 license This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Articles
Medits, Iris
Vaney, Marie‐Christine
Rouvinski, Alexander
Rey, Martial
Chamot‐Rooke, Julia
Rey, Felix A
Heinz, Franz X
Stiasny, Karin
Extensive flavivirus E trimer breathing accompanies stem zippering of the post‐fusion hairpin
title Extensive flavivirus E trimer breathing accompanies stem zippering of the post‐fusion hairpin
title_full Extensive flavivirus E trimer breathing accompanies stem zippering of the post‐fusion hairpin
title_fullStr Extensive flavivirus E trimer breathing accompanies stem zippering of the post‐fusion hairpin
title_full_unstemmed Extensive flavivirus E trimer breathing accompanies stem zippering of the post‐fusion hairpin
title_short Extensive flavivirus E trimer breathing accompanies stem zippering of the post‐fusion hairpin
title_sort extensive flavivirus e trimer breathing accompanies stem zippering of the post‐fusion hairpin
topic Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7403712/
https://www.ncbi.nlm.nih.gov/pubmed/32484292
http://dx.doi.org/10.15252/embr.202050069
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