Summary
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1.
Mitochondrial ribosomes have been isolated from five strains of Saccharomyces cerevisiae each carrying a mitochondrial mutation conferring in vivo resistance to spiramycin.
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2.
The response of poly U directed poly-phenylalanine synthesis to the antibiotics spiramycin, carbomycin and lincomycin was tested using the ribosomes of each mutant. The results indicate that all mutants possess altered ribosomes. Genetic mapping studies suggest that the 21S rRNA may be modified in each mutant.
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3.
The expression of antibiotic resistance by the mitochondrial ribosomes of some strains is partially or totally dependent upon an association with the mitochondrial membrane. Interpretation of the protein synthesis data is made in terms of the existence of a functional interaction between the ribosomes and the membrane in vivo.
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4.
Phenotypic interactions have been observed between different ribosomal mutations including ery1, ery2, spi2, spi3 and spi4 and a mutation affecting the mitochondrial membrane, oli. The expression of the ribosomal mutation is often markedly affected by the presence of the oli1 membrane mutation.
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5.
Membrane effects very similar to those observed following the introduction of the oli1 mutation, such as the unmasking of antibiotic sensitive ribosomal sites, can be obtained by the treatment in vivo of certain antibiotic resistant strains with non-toxic levels of the detergent SDS (< 0.01%).
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6.
The SDS effect together with the observation of phenotypic interactions between mutations provide strong supportive evidence of a functional association between a membrane component (in this case of the mtATPase) and a component of the mitochondrial ribosomes.
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Communicated by W. Gajewski
Publication number 50 in the series Biogenesis of Mitochondria
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Spithill, T.W., Trembath, M.K., Lukins, H.B. et al. Mutations of the mitochondrial DNA of Saccharomyces cerevisiae which affect the interaction between mitochondrial ribosomes and the inner mitochondrial membrane. Molec. Gen. Genet. 164, 155–162 (1978). https://doi.org/10.1007/BF00267380
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DOI: https://doi.org/10.1007/BF00267380