Study on proteins from yeast cytoplasmic ribosomes by two-dimensional gel electrophoresis.

Proteins of yeast cytoplasmic ribosomes were analyzed by two different methods of two dimensional gel electrophoresis: run at pH 8.6 in 1-D1 and at pH 4.6 in 2-D (Method A); run at pH 5.0 in 1-D and in the presence of sodium dodecyl sulfate in 2-D (Method B). The numbers of proteins estimated were 28 (Method A) and 29 or 30 (Method B) in the 40S small subunit, and 40 (Method A) and 41 (Method B) in the 60S large subunit, respectively. Molecular weights of proteins in the small and the large subunits were found to be less than 40,000 and 60,000 respectively.