Journal
MOLECULAR CELL
Volume 11, Issue 6, Pages 1525-1536Publisher
CELL PRESS
DOI: 10.1016/S1097-2765(03)00185-0
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Funding
- NIAID NIH HHS [AI 14102] Funding Source: Medline
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RNA editing produces mature trypanosome mitochondrial mRNAs by uridylate (U) insertion and deletion. In insertion editing, Us, are added to the pre-mRNA by a 3' terminal uridylyl transferase (TUTase) activity. We report the identification of a TUTase activity that co-purifies with in vitro editing and is catalyzed by the integral editosome protein TbMP57. TbMP57 catalyzes the addition of primarily a single U to single-stranded (ss) RNA and adds the number of Us specified by a guide RNA to insertion editing-like substrates. TbMP57 is distinct from a previously identified TUTase that adds many Us to ssRNA and which we find is neither a stable editosome component nor does it add Us to editing-like substrates. Recombinant TbMP57 specifically interacts with the editosome protein TbMP81, and this interaction enhances the TUTase activity. These results suggest that TbMP57 catalyzes U addition to pre-mRNA during editing.
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