The strange evolutionary history of plant mitochondrial tRNAs and their aminoacyl-tRNA synthetases

Article Abstract:

Mitochondria and plastids have eubacterial ancestors, and most mitochondrial and plastic proteins are now encoded by nuclear genes, derived from organellar nucleic acids incorporated into nuclear DNA. However some genes remain in both organelles, requiring a functional translation system. Plant mitochondria have lost most of their original tRNA genes, and the heterogeneous mix of tRNAs and aaRSs found in plant mitochondria is thought to be unique. It is uncertain whey tRNA replacements have occurred, but a reduction in the number of genes needed for organelle biogenesis may be a possible advantage.

Mitochondria

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RNA editing site recognition in higher plant mitochondria

Article Abstract:

RNA editing has been much described in biological systems. RNA editing in in plant mitochondria has been reported in bryophyte mitochondria and chloroplasts. mRNA editing in higher plant plastids involves C to U substitutions. Studies suggest that editing site specificity in mitochondrial transcripts is influenced and determined by RNA sequence recombination and changes.

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