Abstract:
:The NIa protein of potyviruses provides VPg and proteolytic functions during virus replication. It has also been shown to confer host genotype-specific movement functions in plants. Specifically, NIa from tobacco etch virus (TEV)-Oxnard, but not from most other strains, confers the ability to move long distances in Nicotiana tabacum cultivar "V-20." This led to the hypothesis that all or part of NIa may interact with one or more cellular factors. To identify cellular proteins that interact with NIa in a host- or strain-specific manner, a yeast two-hybrid search of a tomato cDNA library was done. Ten proteins that interacted with NIa were recovered, with translation initiation factor eIF4E being by far the most common protein identified. Interaction of eIF4E with NIa was shown to be TEV strain-specific. eIF4E from both tomato and tobacco interacted well with NIa from the HAT strain, but not from the Oxnard strain. However, using chimeric NIa proteins, the determinant for systemic infection of V20 plants was found to be genetically distinct from the determinant controlling eIF4E interaction. In TEV-eIF4E coexpression experiments, evidence suggesting that eIF4E provides a positive effect on genome amplification was obtained.
journal_name
Virologyjournal_title
Virologyauthors
Schaad MC,Anderberg RJ,Carrington JCdoi
10.1006/viro.2000.0416subject
Has Abstractpub_date
2000-08-01 00:00:00pages
300-6issue
2eissn
0042-6822issn
1096-0341pii
S0042-6822(00)90416-1journal_volume
273pub_type
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