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The Arabidopsis thaliana genome harbors more than 450 nuclear genes encoding pentatricopeptide repeat (PPR) proteins that operate in the RNA metabolism of mitochondria and/or plastids. To date, the molecular function of many PPR proteins is still unknown. Here we analyzed the nucleus‐encoded gene At4g19440 coding for a P‐type PPR protein. Knockout of this gene interferes with normal embryo development...
In plant mitochondria, the 5′ ends of many transcripts are generated post-transcriptionally. We show that the pentatricopeptide repeat (PPR) protein RNA PROCESSING FACTOR 4 (RPF4) supports the generation of extra 5′ ends of ccmB transcripts in Landsberg erecta (Ler) and a number of other Arabidopsis thaliana ecotypes. RPF4 was identified in Ler applying a forward genetic approach supported by complementation...
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