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Kinetoplastid RNA editing: complexes and catalysts
K Stuart1, T E Allen, M L Kable
1Seattle Biomedical Research Institute, 4 Nickerson Street, WA 98109-1651, USA. kstuart@u.washington.edu.
Current Opinion in Chemical Biology
|July 17, 1998
Summary
RNA editing in kinetoplastids inserts uridylates into mitochondrial mRNAs guided by small RNAs. This complex process involves mRNA cleavage, U addition/removal, and ligation, catalyzed by a macromolecular complex.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- Kinetoplastids utilize RNA editing for mitochondrial mRNA maturation.
- This process involves uridylate (U) insertion/deletion guided by small RNAs.
- The precise biochemical mechanism and enzymatic machinery are under investigation.
Purpose of the Study:
- To elucidate the mechanism of RNA editing in kinetoplastids.
- To characterize the macromolecular complex responsible for RNA editing.
- To understand the pathway of uridylate addition/removal and ligation.
Main Methods:
- In vitro studies of RNA editing.
- Biochemical assays to analyze reaction intermediates.
- Characterization of the macromolecular complex involved in editing.
Main Results:
- The reaction pathway involves endonucleolytic mRNA cleavage.
- Uridylate addition or removal occurs at the 3' end of the 5' cleavage product.
- Ligation of cleavage products completes the editing process.
- RNA editing is catalyzed by an associated macromolecular complex.
Conclusions:
- The general mechanism of RNA editing in kinetoplastids has been resolved.
- Editing occurs within a complex macromolecular machinery.
- Further characterization of this complex is needed to fully understand the process.