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TitleThe structure of an infectious immature flavivirus redefines viral architecture and maturation.
Journal, issue, pagesSci Adv, Vol. 7, Issue 20, Year 2021
Publish dateMay 14, 2021
AuthorsNatalee D Newton / Joshua M Hardy / Naphak Modhiran / Leon E Hugo / Alberto A Amarilla / Summa Bibby / Hariprasad Venugopal / Jessica J Harrison / Renee J Traves / Roy A Hall / Jody Hobson-Peters / Fasséli Coulibaly / Daniel Watterson /
PubMed AbstractFlaviviruses are the cause of severe human diseases transmitted by mosquitoes and ticks. These viruses use a potent fusion machinery to enter target cells that needs to be restrained during viral ...Flaviviruses are the cause of severe human diseases transmitted by mosquitoes and ticks. These viruses use a potent fusion machinery to enter target cells that needs to be restrained during viral assembly and egress. A molecular chaperone, premembrane (prM) maintains the virus particles in an immature, fusion-incompetent state until they exit the cell. Taking advantage of an insect virus that produces particles that are both immature and infectious, we determined the structure of the first immature flavivirus with a complete spike by cryo-electron microscopy. Unexpectedly, the prM chaperone forms a supporting pillar that maintains the immature spike in an asymmetric and upright state, primed for large rearrangements upon acidification. The collapse of the spike along a path defined by the prM chaperone is required, and its inhibition by a multivalent immunoglobulin M blocks infection. The revised architecture and collapse model are likely to be conserved across flaviviruses.
External linksSci Adv / PubMed:33990320 / PubMed Central
MethodsEM (single particle)
Resolution4.4 - 9.6 Å
Structure data

23147

7l30

EMDB-23147, PDB-7l30:
Binjari virus (BinJV)
Method: EM (single particle) / Resolution: 4.4 Å

EMDB-23330:
Binjari virus (BinJV) complexed with pr-specific Fab 2A7
Method: EM (single particle) / Resolution: 9.6 Å

Source
  • binjari virus
  • Mus musculus (house mouse)
KeywordsVIRUS / Flavivirus / glycoprotein / fusion

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