title: Analysis of siRNA-suppressor of gene silencing interactions.
abstract: RNA silencing is an evolutionarily conserved system that functions as an antiviral mechanism in higher plants and animals. To counteract RNA silencing, viruses evolved silencing suppressors that interfere with siRNA guided RNA silencing pathway. We used the heterologous Drosophila in vitro embryo RNA to analyze the molecular mechanism of suppression of silencing suppressors. We found that different silencing suppressors inhibit the RNA silencing via binding to siRNAs. None of the suppressors affected the activity of preassembled RISC complexes. In contrast, suppressors uniformly inhibited the siRNA-initiated RISC assembly pathway by preventing RNA silencing initiator complex formation. Here, we provide the protocol for the detailed analysis of p19 silencing suppressors of tombusviruses in the heterologous Drosophila in vitro system.
authors: Plant Biology Institute, Agricultural Biotechnology Center, 411, H-2101, Gödöllö, Hungary.
authors: Lóránt
authors: L
authors: Lakatos
authors: József
authors: J
authors: Burgyán
mesh_terms: D000818:Animals; D004330:Drosophila / Q000196:embryology / Q000821:virology; D004591:Electrophoresis, Polyacrylamide Gel / Q000379:methods; D024202:Electrophoretic Mobility Shift Assay / Q000379:methods; D004625:Embryo, Nonmammalian; D020868:Gene Silencing; D012313:RNA / Q000235:genetics; D034741:RNA, Small Interfering / Q000235:genetics* / Q000378:metabolism; D013489:Suppression, Genetic; D014158:Transcription, Genetic
chemical_list: D034741:RNA, Small Interfering; D012313:RNA