Interplay of HCPro and CP in the Regulation of Potato Virus A RNA Expression and Encapsidation.
coat protein (CP)
encapsidation
helper-component proteinase (HCPro)
particle stability
potato virus A
potyvirus
viral gene expression
Journal
Viruses
ISSN: 1999-4915
Titre abrégé: Viruses
Pays: Switzerland
ID NLM: 101509722
Informations de publication
Date de publication:
07 06 2022
07 06 2022
Historique:
received:
21
04
2022
revised:
27
05
2022
accepted:
03
06
2022
entrez:
24
6
2022
pubmed:
25
6
2022
medline:
28
6
2022
Statut:
epublish
Résumé
Potyviral coat protein (CP) and helper component-proteinase (HCPro) play key roles in both the regulation of viral gene expression and the formation of viral particles. We investigated the interplay between CP and HCPro during these viral processes. While the endogenous HCPro and a heterologous viral suppressor of gene silencing both complemented HCPro-less potato virus A (PVA) expression, CP stabilization connected to particle formation could be complemented only by the cognate PVA HCPro. We found that HCPro relieves CP-mediated inhibition of PVA RNA expression likely by enabling HCPro-mediated sequestration of CPs to particles. We addressed the question about the role of replication in formation of PVA particles and gained evidence for encapsidation of non-replicating PVA RNA. The extreme instability of these particles substantiates the need for replication in the formation of stable particles. During replication, viral protein genome linked (VPg) becomes covalently attached to PVA RNA and can attract HCPro, cylindrical inclusion protein and host proteins. Based on the results of the current study and our previous findings we propose a model in which a large ribonucleoprotein complex formed around VPg at one end of PVA particles is essential for their integrity.
Identifiants
pubmed: 35746704
pii: v14061233
doi: 10.3390/v14061233
pmc: PMC9227828
pii:
doi:
Substances chimiques
RNA
63231-63-0
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
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