The ribosomal subunit composition of mitochondria is similar to:
Endosymbiosis is supported by mitochondrial translation apparatus resembling bacteria. Mitochondrial ribosomes, mitoribosomes, in mammals sediment as fifty five S composed of twenty eight S small and thirty nine S large subunits, total mass two point seven megadaltons, containing two rRNAs and about eighty two proteins where only thirty percent homologous to bacterial proteins and rest mitochondria-specific adaptations for membrane protein synthesis. They retain bacterial features such as leaderless initiation, formylmethionine start, lack of five prime cap, and sensitivity to tetracycline, ch
Ref: Gray Annu Rev Genet; mitochondria endosymbiont mitoribosome 55S homologous to bacterial 70S.
