Abstract

The number of proteins in yeast ribosomal subunits was determined by two-dimensional polyacrylamide gel electrophoresis. The 40S subunit obtained after dissociation of ribosomes at high ionic strength contains 30 different protein species (including six acidic proteins). The 60S subunit, obtained in the same way contains 39 different species (including 1 acidic protein). While the total number of protein species found in yeast ribosomes, thus, is in close agreement with those reported for other eukaryotic organisms, the distribution between acidic and basic proteins is quite different.

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