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Nucleus-encoded Factors Involved in 5' and 3' Processing of Chloroplast Transcripts in Chlamydomonas Reinhardtii
Chloroplast RNA maturation and degradation are regulated by nucleusencoded factors that interact with sequences and structures within the RNA. Although several transcript-specific factors have been identified, those involved globally in RNA metabolism, apart from ribonucleases, have mostly remained elusive. Three pleiotropic nuclear mutations, mcd3, mcd4, and mcd5, appear to affect this global RNA metabolism, since they impact 5' end and 3' end maturation of two or more chloroplast transcripts in Chlamydomonas reinhardtii. These mutants were initially isolated as photoautotrophic suppressors of the 5' UTR mutations LS2 and LS6, which destabilized petD transcripts, but analysis of transcripts...
