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TitleBipartite genome and structural organization of the parvovirus Acheta domesticus segmented densovirus.
Journal, issue, pagesNat Commun, Vol. 14, Issue 1, Page 3515, Year 2023
Publish dateJun 14, 2023
AuthorsJudit J Pénzes / Hanh T Pham / Paul Chipman / Emmanuel W Smith / Robert McKenna / Peter Tijssen /
PubMed AbstractParvoviruses (family Parvoviridae) are currently defined by a linear monopartite ssDNA genome, T = 1 icosahedral capsids, and distinct structural (VP) and non-structural (NS) protein expression ...Parvoviruses (family Parvoviridae) are currently defined by a linear monopartite ssDNA genome, T = 1 icosahedral capsids, and distinct structural (VP) and non-structural (NS) protein expression cassettes within their genome. We report the discovery of a parvovirus with a bipartite genome, Acheta domesticus segmented densovirus (AdSDV), isolated from house crickets (Acheta domesticus), in which it is pathogenic. We found that the AdSDV harbors its NS and VP cassettes on two separate genome segments. Its vp segment acquired a phospholipase A2-encoding gene, vpORF3, via inter-subfamily recombination, coding for a non-structural protein. We showed that the AdSDV evolved a highly complex transcription profile in response to its multipartite replication strategy compared to its monopartite ancestors. Our structural and molecular examinations revealed that the AdSDV packages one genome segment per particle. The cryo-EM structures of two empty- and one full-capsid population (3.3, 3.1 and 2.3 Å resolution) reveal a genome packaging mechanism, which involves an elongated C-terminal tail of the VP, "pinning" the ssDNA genome to the capsid interior at the twofold symmetry axis. This mechanism fundamentally differs from the capsid-DNA interactions previously seen in parvoviruses. This study provides new insights on the mechanism behind ssDNA genome segmentation and on the plasticity of parvovirus biology.
External linksNat Commun / PubMed:37316488 / PubMed Central
MethodsEM (single particle)
Resolution2.3 - 3.3 Å
Structure data

28550

8er8

EMDB-28550, PDB-8er8:
Acheta domesticus segmented densovirus, mature virion capsid structure
Method: EM (single particle) / Resolution: 2.3 Å

28553

8erk

EMDB-28553, PDB-8erk:
Acheta domesticus segmented densovirus, high buoyancy (HB) capsid, a mixed population of empty and immature full particles
Method: EM (single particle) / Resolution: 2.5 Å

28605

8eu6

EMDB-28605, PDB-8eu6:
Acheta domesticus segmented densovirus high buoyancy fraction 1 (HB1) empty capsid structure
Method: EM (single particle) / Resolution: 3.0 Å

28607

8eu7

EMDB-28607, PDB-8eu7:
Acheta domesticus segmented densovirus VP-ORF1 virus-like particle
Method: EM (single particle) / Resolution: 3.3 Å

Source
  • unclassified densovirinae (virus)
  • solenopsis invicta-associated densovirus
KeywordsVIRUS/DNA / parvovirus / densovirus / virus capsid / virion / insect virus / capsid / invertebrate / VIRUS-DNA complex / VIRUS / VIRUS LIKE PARTICLE

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