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Interplay of HCPro and CP in the Regulation of Potato Virus A RNA Expression and Encapsidation

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 vira...

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Autores principales: Saha, Shreya, Lõhmus, Andres, Dutta, Pinky, Pollari, Maija, Mäkinen, Kristiina
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9227828/
https://www.ncbi.nlm.nih.gov/pubmed/35746704
http://dx.doi.org/10.3390/v14061233
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author Saha, Shreya
Lõhmus, Andres
Dutta, Pinky
Pollari, Maija
Mäkinen, Kristiina
author_facet Saha, Shreya
Lõhmus, Andres
Dutta, Pinky
Pollari, Maija
Mäkinen, Kristiina
author_sort Saha, Shreya
collection PubMed
description 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.
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spelling pubmed-92278282022-06-25 Interplay of HCPro and CP in the Regulation of Potato Virus A RNA Expression and Encapsidation Saha, Shreya Lõhmus, Andres Dutta, Pinky Pollari, Maija Mäkinen, Kristiina Viruses Article 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. MDPI 2022-06-07 /pmc/articles/PMC9227828/ /pubmed/35746704 http://dx.doi.org/10.3390/v14061233 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Saha, Shreya
Lõhmus, Andres
Dutta, Pinky
Pollari, Maija
Mäkinen, Kristiina
Interplay of HCPro and CP in the Regulation of Potato Virus A RNA Expression and Encapsidation
title Interplay of HCPro and CP in the Regulation of Potato Virus A RNA Expression and Encapsidation
title_full Interplay of HCPro and CP in the Regulation of Potato Virus A RNA Expression and Encapsidation
title_fullStr Interplay of HCPro and CP in the Regulation of Potato Virus A RNA Expression and Encapsidation
title_full_unstemmed Interplay of HCPro and CP in the Regulation of Potato Virus A RNA Expression and Encapsidation
title_short Interplay of HCPro and CP in the Regulation of Potato Virus A RNA Expression and Encapsidation
title_sort interplay of hcpro and cp in the regulation of potato virus a rna expression and encapsidation
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9227828/
https://www.ncbi.nlm.nih.gov/pubmed/35746704
http://dx.doi.org/10.3390/v14061233
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