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.
journal_name
Virologyjournal_title
Virologyauthors
Rojas MR,Zerbini FM,Allison RF,Gilbertson RL,Lucas WJdoi
10.1006/viro.1997.8777subject
Has Abstractpub_date
1997-10-27 00:00:00pages
283-95issue
2eissn
0042-6822issn
1096-0341pii
S0042-6822(97)98777-8journal_volume
237pub_type
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