Summary
Mitochondrial DNA was isolated from an oligomycin-resistant petite mutant of yeast, Saccharomyces cerevisiae. It had repeated sequences of 3600 base pairs. This segment was about one twentieth of the whole mtDNA of wild type yeast, which had a size of 74 kilo base pairs.
This segment of mtDNA had one cleavage site for a restriction endonuclease, Hind II, which was more resistant to cleavage than the other Hind II sites in wild type mtDNA. It had two cleavage sites for Hha I and gave two Hha fragments, which were arranged alternatively. Digestion with Hae III gave four fragments and these fragments were mapped.
Mitochondrial DNA of this mutant showed a loss of heterogeneity in a melting profile. It melted within a narrow range of temperature, which was similar to that of poly dA·poly dT. Its differential melting curve was significantly different from that of wild type mtDNA.
Mapping of mtDNA of a wild type yeast was carried out with restriction endonucleases. Fragments of mtDNA, which were isolated from petites carrying oligomycin-erythromycin-chloramphenicol-resistance and erythromycin-chloramphenicol resistance were also mapped. Loci of oligomycin-resistance, erythromycin-resistance and chloramphenicol-resistance were investigated based on the maps of Eco R I fragments and Hind II fragments.
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Communicated by F. Kaudewitz
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Wakabayashi, K. Segments of mitochondrial DNA of yeast carrying antibiotic resistances. Molec. Gen. Genet. 159, 229–238 (1978). https://doi.org/10.1007/BF00268259
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DOI: https://doi.org/10.1007/BF00268259