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TitleStructures of the Foamy virus fusion protein reveal an unexpected link with the F protein of paramyxo- and pneumoviruses.
Journal, issue, pagesSci Adv, Vol. 10, Issue 41, Page eado7035, Year 2024
Publish dateOct 11, 2024
AuthorsIgnacio Fernández / François Bontems / Delphine Brun / Youna Coquin / Casper A Goverde / Bruno E Correia / Antoine Gessain / Florence Buseyne / Felix A Rey / Marija Backovic /
PubMed AbstractFoamy viruses (FVs) constitute a subfamily of retroviruses. Their envelope (Env) glycoprotein drives the merger of viral and cellular membranes during entry into cells. The only available structures ...Foamy viruses (FVs) constitute a subfamily of retroviruses. Their envelope (Env) glycoprotein drives the merger of viral and cellular membranes during entry into cells. The only available structures of retroviral Envs are those from human and simian immunodeficiency viruses from the subfamily of orthoretroviruses, which are only distantly related to the FVs. We report the cryo-electron microscopy structures of the FV Env ectodomain in the pre- and post-fusion states, which unexpectedly demonstrate structural similarity with the fusion protein (F) of paramyxo- and pneumoviruses, implying an evolutionary link between the viral fusogens. We describe the structural features that are unique to the FV Env and propose a mechanistic model for its conformational change, highlighting how the interplay of its structural elements could drive membrane fusion and viral entry. The structural knowledge on the FV Env now provides a framework for functional investigations, which can benefit the design of FV Env variants with improved features for use as gene therapy vectors.
External linksSci Adv / PubMed:39392890 / PubMed Central
MethodsEM (single particle)
Resolution3.1 - 4.2 Å
Structure data

19347

8rm0

EMDB-19347, PDB-8rm0:
Cryo-EM structure of a Foamy Virus fusion glycoprotein stabilized in the prefusion conformation
Method: EM (single particle) / Resolution: 3.8 Å

19348

8rm1

EMDB-19348, PDB-8rm1:
Cryo-EM structure of a Foamy Virus fusion glycoprotein in the postfusion conformation
Method: EM (single particle) / Resolution: 3.1 Å

EMDB-50529: Cryo-EM map of a Gorilla Foamy Virus fusion glycoprotein in the postfusion conformation (C1 symmetry)
Method: EM (single particle) / Resolution: 3.4 Å

EMDB-50530: Cryo-EM map of a Gorilla Foamy Virus fusion glycoprotein stabilized in the prefusion conformation (C1 symmetry)
Method: EM (single particle) / Resolution: 4.2 Å

Chemicals

ChemComp-NAG:
2-acetamido-2-deoxy-beta-D-glucopyranose

Source
  • Spumavirus
  • simian foamy virus
KeywordsVIRUS / Envelope / Fusion / Spumavirus

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