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

Archive ouverte

Small, Ian | Akashi, K. | Chapron, Audrey | Dietrich, Arthur | Duchêne, A.M. | Lancelin, Dominique | Maréchal-Drouard, B. | Menand, Benoît | Mireau, Hakim | Moudden, Y. | Ovesna, J. | Peeters, Nemo | Sakamoto, Wataru | Souciet, G. | Wintz, H.

Edité par CCSD ; Oxford University Press (OUP) -

International audience. The translation systems of plant mitochondria differ from those of other mitochon-dria in that they incorporate tRNAs of three different origins: native mitochondrial tRNAs, plastid tRNAs transcribed from plastid DNA insertions in mitochondrial DNA, and nuclearly encoded imported tRNAs. The complicated evolutionary history of the tRNA replacement events leading up to this situation is slowly being unrav-eled. Recent research on plant aminoacyl-tRNA synthetases is starting to reveal how the mitochondrial compartment can cope with this unusual mix of tRNAs and has uncovered an unprecedented degree of sharing of isoforms between compart-ments. Many plant aminoacyl-tRNA synthetases are dual targeted to two compart-ments, either cytosol/mitochondria or plastids/mitochondria. The molecular basis for some of these cases of dual targeting are described.

• Description
• Sujet/Public
• Outil
• Outil d'anticipation
• Mémoire et thèse
• Gestion