Summary
A set of mutants affected in translational fidelity was constructed by transduction within an otherwise isogenic Escherichia coli B argF40 argR11 background. Alterations in ribosomal proteins S4, S5, S12 and L6 either as single mutations or in various combinations were compared for their effects on aminoglycoside phenotypes, on in vivo and in vitro mis-reading and on the rate of peptide bond formation. Results may be summarized as follows: (i) Strains carrying two ambiguity mutations on the ribosome without any restrictive mutation are viable. When together, they only weakly increase the level of mistranslation as judged by several in vivo and in vitro test systems. (ii) The combination of two ram mutations causes a very strong cooperative increase of streptomycin sensitivity, irrespective of whether the strains have a wild-type S12 or mutationally altered S12 proteins (of the drug-resistant or-dependent types) on their ribosomes; (iii) The S4 and S5 ram mutations do not alter the response of the ribosome to aminoglycosides of the 2-desoxystreptamine group which are structurally unrelated to streptomycin. This is interpreted in terms of an effect of these ram mutations on the streptomycin binding site but not on the site(s) of binding of the other aminoglycosides. (iv) The rate of polypeptide bond formation which was determined from the kinetics of β-galactosidase induction is not significantly changed in strains bearing the ram and the strA (streptomycin-resistant) alleles. In contrast, the L6 and the strA (streptomycin-dependent) alleles strongly reduce the rate of polypeptide elongation which mechanistically might be connected with restriction of ambiguity (Ninio, 1974) in these cases.
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Piepersberg, W., Noseda, V. & Böck, A. Bacterial ribosomes with two ambiguity mutations: Effects on translational fidelity, on the response to aminoglycosides and on the rate of protein synthesis. Molec. Gen. Genet. 171, 23–34 (1979). https://doi.org/10.1007/BF00274011
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DOI: https://doi.org/10.1007/BF00274011