Abstract
Chloroplast mRNAs can be subject to posttranscriptional pyrimidine-to-pyrimidine conversions at highly specific sites. This RNA modification mechanism shows a high degree of similarity to plant mitochondrial editing but differs markedly from, and is most likely evolutionarily unrelated to, all other RNA editing systems. The study of RNA editing processes in chloroplasts has been largely hampered by the lack ofin vitroediting systems; however, considerable insights into the recognition mechanisms of individual editing sites have come fromin vivoapproaches. Chloroplast transformation proved to be a particularly useful tool to study plastid RNA editing. In this article, specific methods for the analysis of chloroplast RNA editing are discussed. Detailed experimental procedures are provided for (i) the purification of chloroplasts and (ii) the stable genetic transformation of higher plant plastids.
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