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During RNA editing in kinetoplastid parasites, trans-acting guide RNAs (gRNAs) direct the insertion and deletion of U residues at precise sites in mitochondrial pre-mRNAs. We show here that some modifications to the 3' terminal ribose of gRNA inhibit its ability to direct in vitro U insertion. However, we found that gRNAs lacking this moiety in some circumstances support in vitro editing. Thus, the 3' OH is not required. Inhibition resulting from gRNA modification can be overcome by increasing the gRNA-pre-mRNA base-pairing potential upstream of the editing site, suggesting an importance for this interaction to productive processing.

Kinetoplastid RNA editing does not require the terminal 3′ hydroxyl of guide RNA, but modifications to the guide RNA terminus can inhibit in vitro U insertion