Abstract
Transfer RNAs of Mycoplasma capricolum were separated by two-dimensional polyacrylamide gel electrophoresis, and the relative abundance of each of the 28 known tRNA species was measured. There existed a correlation between the relative amount of isoacceptor tRNAs and the frequency in choosing synonymous codons that could be translated by the isoacceptors. Furthermore, it was observed that the total amount of tRNAs for a particular amino acid was paralleled by the composition of the amino acid in ribosomal proteins. A similar relationship was obtained from reexamination of the previous data on Escherichia coli tRNAs, suggesting that the amount of tRNAs for an amino acid is affected by the usage of the amino acid in proteins.
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Selected References
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