Abstract
A cell-free protein-synthesizing system containing free ribosomes and mRNA from rat forebrain is described. Characteristics of protein synthesis were studied in this system with enzyme factors extracted from rat forebrain ribosomes or rabbit reticulocyte ribosomes. Products of protein synthesis with each of these factor fractions were compared by polyacrylamide gel electrophoresis. There were significant differences in the distribution of polypeptide products in the gels, suggesting that the source of protein synthesis factors is important in determining the relative rates of translation of rat forebrain mRNA molecules.
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