Abstract
The amino-acid compositions of the mitochondrial ribosomal subunits of Saccharomyces cerevisiae have been determined and compared to those of cytoplasmic ribosomal subunits. For the large subunits, the mitochondrial and cytoplasmic ribosomes showed major differences in the proportions of arginine, alanine and methionine. For the small subunits, arginine, aspartic acid, alanine, valine and methionine showed marked differences. We have compared these amino-acid compositions with those already published of bacterial and eukaryotic ribosomes by a statistical method of data analysis. It appeared clearly that the yeast mitoribosomes are more distant from bacterial ribosomes than from eukaryotic cytoribosomes.
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