Abstract:
:Many classes of small RNA (sRNA) involved in RNA silencing are generated by double-stranded RNA (dsRNA) processing. Although principles of sRNA biogenesis have emerged, newly identified classes of sRNAs have features that suggest additional biogenesis mechanisms. Tetrahymena thermophila expresses one such class, comprising sRNAs of 23 and 24 nucleotides (nt) with an absolute strand bias in accumulation. Here we demonstrate sRNA production by the T. thermophila Dicer Dcr2 and the RNA-dependent RNA polymerase Rdr1, which purifies as a multisubunit RNA-dependent RNA polymerase complex (RDRC). Dcr2 and RDRC interact, stimulating Dcr2 activity. Moreover, Dcr2 specificity is influenced by RDRC beyond this physical interaction, as Dcr2 generates discrete 23- and 24-nt sRNAs only from dsRNA with a 5'-triphosphate. These findings suggest that sRNA strand bias arises from Dcr2 processing polarity, conferred by physical and functional coupling of RDRC and Dicer enzymes.
journal_name
Nat Struct Mol Bioljournal_title
Nature structural & molecular biologyauthors
Lee SR,Collins Kdoi
10.1038/nsmb1262subject
Has Abstractpub_date
2007-07-01 00:00:00pages
604-10issue
7eissn
1545-9993issn
1545-9985pii
nsmb1262journal_volume
14pub_type
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