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-Structure paper
Title | A succession of two viral lattices drives vaccinia virus assembly. |
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Journal, issue, pages | PLoS Biol, Vol. 21, Issue 3, Page e3002005, Year 2023 |
Publish date | Mar 2, 2023 |
Authors | Miguel Hernandez-Gonzalez / Thomas Calcraft / Andrea Nans / Peter B Rosenthal / Michael Way / |
PubMed Abstract | During its cytoplasmic replication, vaccinia virus assembles non-infectious spherical immature virions (IV) coated by a viral D13 lattice. Subsequently, IV mature into infectious brick-shaped ...During its cytoplasmic replication, vaccinia virus assembles non-infectious spherical immature virions (IV) coated by a viral D13 lattice. Subsequently, IV mature into infectious brick-shaped intracellular mature virions (IMV) that lack D13. Here, we performed cryo-electron tomography (cryo-ET) of frozen-hydrated vaccinia-infected cells to structurally characterise the maturation process in situ. During IMV formation, a new viral core forms inside IV with a wall consisting of trimeric pillars arranged in a new pseudohexagonal lattice. This lattice appears as a palisade in cross-section. As maturation occurs, which involves a 50% reduction in particle volume, the viral membrane becomes corrugated as it adapts to the newly formed viral core in a process that does not appear to require membrane removal. Our study suggests that the length of this core is determined by the D13 lattice and that the consecutive D13 and palisade lattices control virion shape and dimensions during vaccinia assembly and maturation. |
External links | PLoS Biol / PubMed:36862727 / PubMed Central |
Methods | EM (subtomogram averaging) / EM (tomography) |
Resolution | 19.2 - 30.6 Å |
Structure data | EMDB-15596: In situ subtomogram average of Vaccinia virus (WR) palisade, all virions EMDB-15597: In situ subtomogram average of Vaccinia virus (WR) palisade, from CEVs EMDB-15598: In situ subtomogram average of Vaccinia virus (WR) palisade, from IMVs EMDB-15599: In situ subtomogram average of Vaccinia virus (WR) palisade, from IEVs EMDB-15600: Cryotomogram of Vaccinia virus (WR) infected HeLa cell (immature virions) EMDB-15601: Cryotomogram of Vaccinia virus (WR) infected HeLa cell (mature virions) EMDB-15602, PDB-8arh: |
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Keywords | VIRUS / Palisade / Lattice / A4 |