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Molecular and Cellular Biology, November 2000, p. 8447-8457, Vol. 20, No. 22
Seattle Biomedical Research Institute,
Seattle, Washington 98109
Received 10 May 2000/Returned for modification 21 June
2000/Accepted 24 August 2000
RNA editing in Trypanosoma brucei inserts and deletes
uridylates (U's) in mitochondrial pre-mRNAs under the direction of
guide RNAs (gRNAs). We report here the development of a novel in vitro precleaved editing assay and its use to study the gRNA specificity of
the U addition and RNA ligation steps in insertion RNA editing. The 5'
fragment of substrate RNA accumulated with the number of added U's
specified by gRNA, and U addition products with more than the specified
number of U's were rare. U addition up to the number specified
occurred in the absence of ligation, but accumulation of U addition
products was slowed. The 5' fragments with the correct number of added
U's were preferentially ligated, apparently by adenylylated RNA ligase
since exogenously added ATP was not required and since ligation was
eliminated by treatment with pyrophosphate. gRNA-specified U addition
was apparent in the absence of ligation when the pre-mRNA immediately
upstream of the editing site was single stranded and more so when it
was base paired with gRNA. These results suggest that both the U
addition and RNA ligation steps contributed to the precision of RNA editing.
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Uridylate Addition and RNA Ligation Contribute to
the Specificity of Kinetoplastid Insertion RNA Editing
*
Corresponding author. Mailing address: Seattle
Biomedical Research Institute, 4 Nickerson St., Seattle, WA 98109. Phone: (206) 284-8846 x316. Fax: (206) 284-0313. E-mail:
kstuart{at}u.washington.edu.
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