Mitochondrial ribosomes (mitoribosomes) consist of a small 28S subunit and a large 39S subunit. They have an estimated 75% protein to rRNA composition compared to prokaryotic ribosomes, where this ratio is reversed. Another difference between mammalian mitoribosomes and prokaryotic ribosomes is that the latter contain a 5S rRNA. Among different species, the proteins comprising the mitoribosome differ greatly in sequence, and sometimes in biochemical properties, which prevents easy recognition by sequence homology. MRPS10 (Mitochondrial Ribosomal Protein S10) encodes a 28S subunit protein that belongs to the ribosomal protein S10P family. Pseudogenes corresponding to MRPS10 are found on chromosomes 1q, 3p, and 9p.
