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RNA polymerase II acts as an RNA‐dependent RNA polymerase to extend and destabilize a non‐coding RNA
Author(s) -
Wagner Stacey D,
Yakovchuk Petro,
Gilman Benjamin,
Ponicsan Steven L,
Drullinger Linda F,
Kugel Jennifer F,
Goodrich James A
Publication year - 2013
Publication title -
the embo journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.484
H-Index - 392
eISSN - 1460-2075
pISSN - 0261-4189
DOI - 10.1038/emboj.2013.18
Subject(s) - biology , rna dependent rna polymerase , rna polymerase i , polymerase , rna , small nuclear rna , rna editing , rna polymerase , rna polymerase ii , rna polymerase iii , non coding rna , microbiology and biotechnology , genetics , gene expression , gene , promoter
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.