The pentatricopeptide repeat protein MTSF2 stabilizes a nad1 precursor transcript and defines the 3΄ end of its 5΄-half intron.

ABSTRACT: RNA expression in plant mitochondria implies a large number of post-transcriptional events in which transcript processing and stabilization are essential. In this study, we analyzed the function of the Arabidopsis mitochondrial stability factor 2 gene (MTSF2) and show that the encoded pentatricopeptide repeat protein is essential for the accumulation of stable nad1 mRNA. The production of mature nad1 requires the assembly of three independent RNA precursors via two trans-splicing reactions. Genetic analyses revealed that the lack of nad1 in mtsf2 mutants results from the specific destabilization of the nad1 exons 2-3 precursor transcript. We further demonstrated that MTSF2 binds to its 3΄ extremity with high affinity, suggesting a protective action by blocking exoribonuclease progression.

SUBMITTER: Wang C 

PROVIDER: S-EPMC5449624 | biostudies-literature | 2017 Jun

REPOSITORIES: biostudies-literature