AEF1/MPR25 is implicated in RNA editing of plastid atpF and mitochondrial nad5, and also promotes atpF splicing in Arabidopsis and rice

Aaron Yap, Peter Kindgren, Catherine Colas Des Francs-Small, Tomohiko Kazama, Sandra K. Tanz, Kinya Toriyama, Ian Small

研究成果: Article査読

54 被引用数 (Scopus)

抄録

RNA editing is an essential mechanism that modifies target cytidines to uridine in both mitochondrial and plastid mRNA. Target sites are recognized by pentatricopeptide repeat (PPR) proteins. Using bioinformatics predictions based on the code describing sequence recognition by PPR proteins, we have identified an Arabidopsis editing factor required for editing of atpF in plastids. A loss-of-function mutation in ATPF EDITING FACTOR 1 (AEF1, AT3G22150) results in severe variegation, presumably due to decreased plastid ATP synthase levels. Loss of editing at the atpF site is coupled with a large decrease in splicing of the atpF transcript, even though the editing site is within an exon and 53 nucleotides distant from the splice site. The rice orthologue of AEF1, MPR25, has been reported to be required for editing of a site in mitochondrial nad5 transcripts, and we confirm that editing of the same site is affected in the Arabidopsis aef1 mutant. We also show that splicing of chloroplast atpF transcripts is affected in the rice mpr25 mutant. AEF1 is thus highly unusual for an RNA editing specificity factor in that it has functions in both organelles. Significance Statement The RNA editing factor AEF1/MPR25 is a sequence-specific RNA binding protein with an unusual multi-functional role in editing and splicing of the chloroplast atpF transcript. It is unique (so far) amongst editing specificity factors in also acting in mitochondria, where it recognizes a similar sequence to induce editing of the nad5 transcript.

本文言語English
ページ(範囲)661-669
ページ数9
ジャーナルPlant Journal
81
5
DOI
出版ステータスPublished - 2015 3 1

ASJC Scopus subject areas

  • 遺伝学
  • 植物科学
  • 細胞生物学

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