6VOC image
Entry Detail
PDB ID:
6VOC
EMDB ID:
Keywords:
Title:
icosahedral symmetry reconstruction of brome mosaic virus (RNA 3+4)
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2020-01-30
Release Date:
2020-05-20
Method Details:
Experimental Method:
Resolution:
3.10 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Capsid protein
Chain IDs:A (auth: B), B (auth: C), C (auth: A)
Chain Length:189
Number of Molecules:3
Biological Source:Brome mosaic virus
Ligand Molecules
Primary Citation
Genome organization and interaction with capsid protein in a multipartite RNA virus.
Proc.Natl.Acad.Sci.USA 117 10673 10680 (2020)
PMID: 32358197 DOI: 10.1073/pnas.1915078117

Abstact

We report the asymmetric reconstruction of the single-stranded RNA (ssRNA) content in one of the three otherwise identical virions of a multipartite RNA virus, brome mosaic virus (BMV). We exploit a sample consisting exclusively of particles with the same RNA content-specifically, RNAs 3 and 4-assembled in planta by agrobacterium-mediated transient expression. We find that the interior of the particle is nearly empty, with most of the RNA genome situated at the capsid shell. However, this density is disordered in the sense that the RNA is not associated with any particular structure but rather, with an ensemble of secondary/tertiary structures that interact with the capsid protein. Our results illustrate a fundamental difference between the ssRNA organization in the multipartite BMV viral capsid and the monopartite bacteriophages MS2 and Qβ for which a dominant RNA conformation is found inside the assembled viral capsids, with RNA density conserved even at the center of the particle. This can be understood in the context of the differing demands on their respective lifecycles: BMV must package separately each of several different RNA molecules and has been shown to replicate and package them in isolated, membrane-bound, cytoplasmic complexes, whereas the bacteriophages exploit sequence-specific "packaging signals" throughout the viral RNA to package their monopartite genomes.

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Primary Citation of related structures