Summary
The interactions between the mitochondrial and nucleocytoplasmic systems required for mitochondriogenesis have been investigated at several different levels. Those involved in the formation of functional enzyme complexes have been studied using cytochrome oxidase: this multimeric (2 × 7 and 2 × 6 subunits for enzymes from yeast and beef heart respectively) has been resolved, and the mitochondrial contribution has been shown to be dispensible for catalytic function proper. Using novel mutants, with a mitochondrial mode of inheritance, a mitochondrial gene product localized in the oligomycin-sensitive ATPase has been implicated in the assembly not only of this complex, but of cytochrome oxidase as well. Interactions required for the genetic competence of the mitochondrial system have become apparent as a result of studies in the mechanism of action of the highly effective mitochondrial mutagen ethidium bromide. This agent first becomes covalently inserted into mitochondrial DNA and, after its excision, eventually results in extensive degradation of the macromolecule. The excision reaction has now been shown to be performed by a complex between the oligomycin-sensitive ATPase and a DNA-binding protein presumably involved in recognizing the damage. On the level of replication and expression of the mitochondrial genome studies using thermolabile mutants have demonstrated that these processes appear independent of the replication of nuclear DNA but not of its expression.
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Recipient of Research Career Award K06 5060 from the National Institute of General Medical Sciences, National Institutes of Health; research supported by Research Grant GM 12228 from this Institute.
Publication No. 2251.
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Mahler, H.R., Phan, S.H. & Bastos, R.d.N. Integration and regulation of mitochondrial assembly in yeast. Mol Cell Biochem 14, 67–79 (1977). https://doi.org/10.1007/BF01734167
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DOI: https://doi.org/10.1007/BF01734167