Summary
Ribosomes from nine E. coli mutants with high level resistance to the antibiotic erythromycin were isolated and their proteins were compared with those of the parental strains by two-dimensional polyacrylamide gel electrophoresis, by carboxymethylcellulose column chromatography and by immunological techniques. Two 50S proteins were found to be altered in the mutants: either L 4 or L 22.
Ribosomes with an altered L4 protein bound erythromycin rather poorly and the formation of N-acetylphenylalanyl puromycin was drastically decreased. On the other handribosomes with an altered L22 protein bound erythromycin as efficiently as wild type ribosomes and their puromycin reaction was at least as good as that of wild type ribosomes.
Transduction experiments showed that the mutations affecting both proteins, L4 and L22, are located very close to the str and spc genes, nearer to the spc than to str gene.
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Paper No. 61 on “Ribosomal Proteins”. Preceding paper is by Hasenbank et al., Molec. gen. Genet., 127, 1–18 (1973).
Communicated by E. Bautz
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Wittmann, H.G., Stöffler, G., Apirion, D. et al. Biochemical and genetic studies on two different types of erythromycin resistant mutants of Escherichia coli with altered ribosomal proteins. Molec. Gen. Genet. 127, 175–189 (1973). https://doi.org/10.1007/BF00333665
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DOI: https://doi.org/10.1007/BF00333665