Characterization of silencing suppressor p24 of Grapevine leafroll-associated virus 2.

ABSTRACT: Grapevine leafroll-associated virus 2 (GLRaV-2) p24 has been reported to be an RNA silencing suppressor (RSS). However, the mechanisms underlying p24's suppression of RNA silencing are unknown. Using Agrobacterium infiltration-mediated RNA silencing assays, we showed that GLRaV-2 p24 is a strong RSS triggered by positive-sense green fluorescent protein (GFP) RNA, and that silencing suppression by p24 effectively blocks the accumulation of small interfering RNAs. Deletion analyses showed that the region of amino acids 1-188, which contains all predicted α-helices and β-strands, is required for the RSS activity of p24. Hydrophobic residues I35/F38/V85/V89/W149 and V162/L169/L170, previously shown to be critical for p24 self-interaction, are also crucial for silencing suppression, and western

SUBMITTER: Li M 

PROVIDER: S-EPMC6638178 | biostudies-literature | 2018 Feb

REPOSITORIES: biostudies-literature