Abstract
The levels of macromolecules in Escherichia coli 15T− growing in broth, glucose, succinate, and acetate media were determined to compare relationships among deoxyribonucleic acid (DNA), ribosomal ribonucleic acid (rRNA), transfer RNA (tRNA), and protein in cells at different growth rates. DNA and protein increased in relative amounts with decreasing growth rate; relative amounts of rRNA and tRNA decreased, tRNA making up a slightly larger proportion of RNA. For several amino acid-specific tRNAs studied, acceptor capacities per unit of DNA increased with increasing growth rate. The syntheses of tRNA and rRNA are regulated by similar, yet different, mechanisms. Chromatographic examination on columns of benzoylated diethylaminoethyl-cellulose of isoaccepting tRNAs for arginine, leucine, lysine, methionine, phenylalanine, serine, and valine did not reveal differences in the isoaccepting profiles for rapidly (broth culture) and slowly growing (acetate culture) cells. Therefore, isoacceptors for individual amino acids appear to be regulated as a group. Lower efficiencies of ribosomal function in protein synthesis can be explained, in part, by a low ratio of tRNA to the number of ribosomes available and by a decreasing concentration of tRNA with decreasing growth rate. Data on the tRNAs specific for seven amino acids indicate that the decreasing concentration of tRNA is a general event rather than a severe limitation of any one tRNA or isoaccepting tRNA.
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Selected References
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