Mitochondrial ribosome

The mitochondrial ribosome, or mitoribosome, is a ribonucleoprotein complex that is active in mitochondria and functions as a riboprotein for translating mitochondrial mRNAs encoded in mtDNA. The mitoribosome is attached to the inner mitochondrial membrane. Mitoribosomes, like all ribosomes, consist of two subunits — large (mt-LSU) and small (mt-SSU). Mitoribosomes consist of several specific proteins and only 2 rRNAs. While mitochondrial rRNAs are encoded in the mitochondrial genome, the proteins that make up mitoribosomes are encoded in the nucleus and assembled by cytoplasmic ribosomes before being transported to the mitochondria.

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