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Filamentous virions of Beet yellows virus contain a long body formed by a major capsid protein and a short tail that is assembled by a minor capsid protein (CPm), an Hsp70-homolog (Hsp70h), a 64-kDa protein (p64), and a 20-kDa protein (p20). Using mutation analysis and newly developed in planta assays, here we investigate the genetic requirements for the tail assembly. We show that the inactivation...
Launching the Beet yellows virus (BYV) minireplicon by agrobacterial delivery resulted in an unexpectedly low number of infected cells per inoculated leaf. This effect was due to a strong RNA silencing response in the agroinfiltrated leaves. Strikingly, ectopic co-expression of p21, a BYV RNA silencing suppressor, increased minireplicon infectivity by three orders of magnitude. Mutational analysis...
Using an Agrobacterium-mediated transient assay, we screened the 15.5-kb genome of the Beet yellows virus for proteins with RNA silencing suppressor activity. Among eight proteins tested, only a 21-kDa protein (p21) was able to suppress double-stranded (ds) RNA-induced silencing of the green fluorescent protein (GFP) mRNA. Restoration of GFP expression by p21 under these conditions had no apparent...
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