7NXP image
Entry Detail
PDB ID:
7NXP
Keywords:
Title:
Structure of the C-terminal domain of the pUL77 capsid protein from human cytomegalovirus (HCMV)
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2021-03-19
Release Date:
2021-10-13
Method Details:
Experimental Method:
Resolution:
1.90 Å
R-Value Free:
0.20
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 41 2 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Capsid vertex component 2
Chain IDs:A
Chain Length:479
Number of Molecules:1
Biological Source:Human cytomegalovirus
Ligand Molecules
Primary Citation
Assembly of infectious Kaposi's sarcoma-associated herpesvirus progeny requires formation of a pORF19 pentamer.
Plos Biol. 19 e3001423 e3001423 (2021)
PMID: 34735435 DOI: 10.1371/journal.pbio.3001423

Abstact

Herpesviruses cause severe diseases particularly in immunocompromised patients. Both genome packaging and release from the capsid require a unique portal channel occupying one of the 12 capsid vertices. Here, we report the 2.6 Å crystal structure of the pentameric pORF19 of the γ-herpesvirus Kaposi's sarcoma-associated herpesvirus (KSHV) resembling the portal cap that seals this portal channel. We also present the structure of its β-herpesviral ortholog, revealing a striking structural similarity to its α- and γ-herpesviral counterparts despite apparent differences in capsid association. We demonstrate pORF19 pentamer formation in solution and provide insights into how pentamerization is triggered in infected cells. Mutagenesis in its lateral interfaces blocked pORF19 pentamerization and severely affected KSHV capsid assembly and production of infectious progeny. Our results pave the way to better understand the role of pORF19 in capsid assembly and identify a potential novel drug target for the treatment of herpesvirus-induced diseases.

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Primary Citation of related structures