title: RNA polymerase II acts as an RNA-dependent RNA polymerase to extend and destabilize a non-coding RNA.
abstract: RNA polymerase II (Pol II) is a well-characterized DNA-dependent RNA polymerase, which has also been reported to have RNA-dependent RNA polymerase (RdRP) activity. Natural cellular RNA substrates of mammalian Pol II, however, have not been identified and the cellular function of the Pol II RdRP activity is unknown. We found that Pol II can use a non-coding RNA, B2 RNA, as both a substrate and a template for its RdRP activity. Pol II extends B2 RNA by 18 nt on its 3'-end in an internally templated reaction. The RNA product resulting from extension of B2 RNA by the Pol II RdRP can be removed from Pol II by a factor present in nuclear extracts. Treatment of cells with α-amanitin or actinomycin D revealed that extension of B2 RNA by Pol II destabilizes the RNA. Our studies provide compelling evidence that mammalian Pol II acts as an RdRP to control the stability of a cellular RNA by extending its 3'-end.
authors: Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO, USA.
authors: Stacey D
authors: SD
authors: Wagner
authors: Petro
authors: P
authors: Yakovchuk
authors: Benjamin
authors: B
authors: Gilman
authors: Steven L
authors: SL
authors: Ponicsan
authors: Linda F
authors: LF
authors: Drullinger
authors: Jennifer F
authors: JF
authors: Kugel
authors: James A
authors: JA
authors: Goodrich
mesh_terms: D000818:Animals; D001483:Base Sequence; D006367:HeLa Cells; D006801:Humans; D051379:Mice; D008954:Models, Biological; D008969:Molecular Sequence Data; D041681:NIH 3T3 Cells; D009690:Nucleic Acid Conformation; D012319:RNA Polymerase II / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D020871:RNA Stability / Q000235:genetics / Q000502:physiology; D022661:RNA, Untranslated / Q000235:genetics* / Q000378:metabolism*; D012324:RNA-Dependent RNA Polymerase / Q000235:genetics / Q000378:metabolism / Q000502:physiology; D061805:Transcription Elongation, Genetic; D014158:Transcription, Genetic / Q000235:genetics
chemical_list: D022661:RNA, Untranslated; D012319:RNA Polymerase II; D012324:RNA-Dependent RNA Polymerase
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