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• W2938211092 abstract "Abstract Group II introns are particularly plentiful within plant mitochondrial genomes (mtDNAs), where they interrupt the coding-regions of many organellar genes, especialy within complex I (CI) subunits. Their splicing is essential for the biogenesis of the respiratory system and is facilitated by various protein-cofactors that belong to a diverse set of RNA-binding cofactors. These including maturases, which co-evolved with their host-introns, and various trans -acting factors, such as members of the pentatricopeptide-repeat (PPR) protein family. The genomes of angiosperms contain hundreds of PPR -related genes that are postulated to reside within the organelles and affect diverse posttranscriptional steps, such as editing, RNA-stability and processing or translation. Here, we report the characterization of MSP1 (Mitochondria Splicing PPR-factor 1; also denoted as EMB1025), which plays a key role in the processing of nad1 pre-RNAs in Arabidopsis mitochondria. Mutations in MSP1 gene-locus (At4g20090) result in early embryonic arrest. To analyze the putative roles of MSP1 in organellar RNA-metabolism we used a modified embryo-rescue method, which allowed us to obtain sufficient plant tissue for the analysis of the RNA and protein profiles associated with msp1 mutants. Our data indicate that MSP1 is essential for the trans -splicing of nad1 intron 1 in Arabidopsis mitochondria. Accordingly, msp1 mutants show CI biogenesis defects and reduced respiratory-mediated functions. These results provide with important insights into the roles of nuclear-encoded factors during early plant development, and contribute to our limited understanding of the importance of RNA-maturation and splicing in plant mitochondria during early embryogenesis." @default.
• W2938211092 created "2019-04-25" @default.
• W2938211092 creator A5035147227 @default.
• W2938211092 creator A5047377123 @default.
• W2938211092 creator A5068284735 @default.
• W2938211092 date "2019-04-22" @default.
• W2938211092 modified "2023-10-16" @default.
• W2938211092 title "The PPR-related splicing cofactor MSP1/EMB1025 protein, encoded by At4g20090, encode an essential protein that is required for the splicing of nad1 intron 1 and for the biogenesis of complex I in Arabidopsis mitochondria" @default.
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