John UP, et al. (1986) Biogenesis of mitochondria: DNA sequence analysis of mit- mutations in the mitochondrial oli2 gene coding for mitochondrial ATPase subunit 6 in Saccharomyces cerevisiae. Nucleic Acids Res 14(18):7437-51
Abstract: A series of yeast mitochondrial mit- mutants with defects in the oli2 gene, coding for subunit 6 of the mitochondrial ATPase complex, has been analyzed at the DNA sequence level. Fifteen of sixteen primary mit- mutants were shown to contain frameshift or nonsense mutations predicting truncated subunit 6 polypeptides, in various strains ranging from about 20% to 95% of the wild-type length of 259 amino acids. In only one strain could the defect in subunit 6 function be assigned to amino acid substitution in an otherwise full-length subunit 6. Many mutants carried multiple base substitutions or insertions/deletions, presumably arising from the manganese chloride mutagenesis treatment. Revertants from three of the mit- mutants were analyzed: all contained full-length subunit 6 proteins with one or more amino acid substitutions. The preponderance of truncated proteins as opposed to substituted full-length proteins in oli2 mit- mutants is suggested to reflect the ability of subunit 6 to accommodate amino acid substitutions at many locations, with little or no change in its functional properties in the membrane FO-sector of the ATPase complex.
|Status: Published||Type: Journal Article | Research Support, Non-U.S. Gov't||PubMed ID: 2945163|
Topics addressed in this paper
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