Evolution of the function maintenance system of plant organelle genome by C-to-U RNA editing

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Catalytic molecules of the plant organellar RNA editing has long been unidentified. We attempted to isolate and characterize those molecules, using the psbE gene of Arabidopsis thaliana as a model. As a result, we succeeded in concentrating the catalytic activity from the chloroplast lysates by biochemical means, and found that RNase-sensitive component(s) should be involved in the catalytic reaction. Based on this we propose a tentative model of the C-to-U editing machinery.