6XF9 image
Entry Detail
PDB ID:
6XF9
Keywords:
Title:
Crystal structure of KSHV ORF68
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2020-06-15
Release Date:
2021-02-24
Method Details:
Experimental Method:
Resolution:
2.22 Å
R-Value Free:
0.24
R-Value Work:
0.22
R-Value Observed:
0.22
Space Group:
C 2 2 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Packaging protein UL32
Chain IDs:A, B, C, D, E
Chain Length:467
Number of Molecules:5
Biological Source:Human herpesvirus 8 type M
Ligand Molecules
Primary Citation
A pentameric protein ring with novel architecture is required for herpesviral packaging.
Elife 10 ? ? (2021)
PMID: 33554858 DOI: 10.7554/eLife.62261

Abstact

Genome packaging in large double-stranded DNA viruses requires a powerful molecular motor to force the viral genome into nascent capsids, which involves essential accessory factors that are poorly understood. Here, we present structures of two such accessory factors from the oncogenic herpesviruses Kaposi's sarcoma-associated herpesvirus (KSHV; ORF68) and Epstein-Barr virus (EBV; BFLF1). These homologous proteins form highly similar homopentameric rings with a positively charged central channel that binds double-stranded DNA. Mutation of individual positively charged residues within but not outside the channel ablates DNA binding, and in the context of KSHV infection, these mutants fail to package the viral genome or produce progeny virions. Thus, we propose a model in which ORF68 facilitates the transfer of newly replicated viral genomes to the packaging motor.

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Primary Citation of related structures