Capsid protein and helper component-proteinase function as potyvirus cell-to-cell movement proteins.
Virology
; 237(2): 283-95, 1997 Oct 27.
Article
em En
| MEDLINE
| ID: mdl-9356340
ABSTRACT
The role of bean common mosaic necrosis potyvirus (BCMNV) and lettuce mosaic potyvirus (LMV) proteins was investigated in terms of their capacity to function as viral movement proteins (MPs). Using Escherichia coli-expressed proteins and microinjection techniques, direct evidence was obtained that both the potyviral capsid protein (CP) and helper component- proteinase (HC-Pro) function in this capacity, in that both proteins (a) trafficked from cell to cell, (b) induced an increase in plasmodesmal size exclusion limit, and (c) facilitated cell-to-cell movement of viral RNA. CP and HC-Pro mutants were also produced and used in microinjection experiments. Mutations in the core region of the CP either impaired (single and double amino acid substitution mutants) or abolished (triple amino acid substitution mutant) cell-to-cell movement, as did C-terminal deletion mutants in HC-Pro. The BCMNV P1, CI, NIa, and NIb proteins did not exhibit viral MP properties, but NIa and NIb proteins were found to accumulate within the nuclei of injected cells. These results further establish the multifunctional nature of the potyvirus CP and HC-Pro.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Proteínas Virais
/
Replicação Viral
/
Cisteína Endopeptidases
/
Capsídeo
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Potyvirus
Idioma:
En
Ano de publicação:
1997
Tipo de documento:
Article