Steiner, F.A. and Okihara, K.L. and Hoogstrate, S.W. and Sijen, T. and Ketting, R.F. (2009) RDE-1 slicer activity is required only for passenger-strand cleavage during RNAi in Caenorhabditis elegans. Nature Structural & Molecular Biology, 16, 207-11. ISSN 1545-9993.
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RNA interference (RNAi) is a process in which double-stranded RNA is cleaved into small interfering RNAs (siRNAs) that induce the destruction of homologous single-stranded mRNAs. Argonaute proteins are essential components of this silencing process; they bind siRNAs directly and can cleave RNA targets using a conserved RNase H motif. In Caenorhabditis elegans, the Argonaute protein RDE-1 has a central role in RNAi. In animals lacking RDE-1, the introduction of double-stranded RNA does not trigger any detectable level of RNAi. Here we show that RNase H activity of RDE-1 is required only for efficient removal of the passenger strand of the siRNA duplex and not for triggering the silencing response at the target-mRNA level. These results uncouple the role of the RDE-1 RNase H activity in small RNA maturation from its role in target-mRNA silencing in vivo.
|Deposited On:||21 Dec 2009 01:00|
|Last Modified:||13 Oct 2010 12:51|
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