The roles of plant dsRNA-binding proteins in RNAi-like pathways.
Dicers are associated with double-stranded RNA-binding proteins (dsRBPs) in animals. In the plant, Arabidopsis, there are four dicer-like (DCL) proteins and five potential dsRBPs. These DCLs act redundantly and hierarchically. However, we show there is little or no redundancy or hierarchy amongst the DRBs in their DCL interactions. DCL1 operates exclusively with DRB1 to produce micro (mi)RNAs, DCL4 operates exclusively with DRB4 to produce trans-acting (ta) siRNAs and 21nt siRNAs from viral RNA. DCL2 and DCL3 produce viral siRNAs without requiring assistance from any dsRBP. DRB2, DRB3 and DRB5 appear unnecessary for mi-, tasi-, viral si-, or heterochromatinising siRNA production but act redundantly in a developmental pathway.
Curtin
Shaun J
SJ
CSIRO Plant Industry Canberra, P.O. Box 1600, ACT 2601, Australia.
Watson
John M
JM
Smith
Neil A
NA
Eamens
Andrew L
AL
Blanchard
Chris L
CL
Waterhouse
Peter M
PM
D017360:Arabidopsis / Q000201:enzymology / Q000235:genetics / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000145:classification / Q000235:genetics / Q000378:metabolism*; D004251:DNA Transposable Elements; D035683:MicroRNAs / Q000096:biosynthesis / Q000737:chemistry; D009154:Mutation; D009690:Nucleic Acid Conformation; D010641:Phenotype; D010802:Phylogeny; D034622:RNA Interference; D012330:RNA, Double-Stranded / Q000145:classification / Q000235:genetics / Q000378:metabolism*; D018749:RNA, Plant / Q000096:biosynthesis; D034741:RNA, Small Interfering / Q000096:biosynthesis / Q000737:chemistry; D012367:RNA, Viral / Q000096:biosynthesis / Q000737:chemistry; D016601:RNA-Binding Proteins / Q000145:classification / Q000235:genetics / Q000378:metabolism*; D043244:Ribonuclease III / Q000145:classification / Q000235:genetics / Q000378:metabolism*
D029681:Arabidopsis Proteins; D004251:DNA Transposable Elements; D035683:MicroRNAs; D012330:RNA, Double-Stranded; D018749:RNA, Plant; D034741:RNA, Small Interfering; D012367:RNA, Viral; D016601:RNA-Binding Proteins; D043244:Ribonuclease III