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• W1604742435 abstract "This work concerns a biochemical genetic study of subunit 9 of the mitochondrial ATPase complex of Saccharomyces cerevisiae. Subunit 9, encoded by the mitochondrial oli1 gene, contains a hydrophilic loop connecting two transmembrane stems. In one particular oli1 mit- mutant 2422, the substitution of a positively charged amino acid in this loop (Arg39----Met) renders the ATPase complex non-functional. A series of 20 revertants, selected for their ability to grow on nonfermentable substrates, has been isolated from mutant 2422. The results of DNA sequence analysis of the oli1 gene in each revertant have led to the recognition of three groups of revertants. Class I revertants have undergone a same-site reversion event: the mutant Met39 is replaced either by arginine (as in wild-type) or lysine. Class II revertants maintain the mutant Met39 residue, but have undergone a second-site reversion event (Asn35----Lys). Two revertants showing an oligomycin-resistant phenotype carry this same second-site reversion in the loop region together with a further amino acid substitution in either of the two membrane-spanning segments of subunit 9 (either Gly23----Ser or Leu53----Phe). Class III revertants contain subunit 9 with the original mutant 2422 sequence, and additionally carry a recessive nuclear suppressor, demonstrated to represent a single gene. The results on the revertants in classes I and II indicate that there is a strict requirement for a positively charged residue in the hydrophilic loop close to the boundary of the lipid bilayer. The precise location of this positive charge is less stringent; in functional ATPase complexes it can be found at either residue 39 or 35. This charged residue is possibly required to interact with some other component of the mitochondrial ATPase complex. These findings, together with hydropathy plots of subunit 9 polypeptides from normal, mutant and revertant strains, led to the conclusion that the hydrophilic loop in normal subunit 9 extends further than previously suggested, with the boundary of the N-terminal membrane-embedded stem lying at residue 34. The possibility is raised that the observed suppression of the 2422 mutant phenotype in class III revertants is manifested through an accommodating change in a nuclear-encoded subunit of the ATPase complex." @default.
• W1604742435 created "2016-06-24" @default.
• W1604742435 creator A5014418577 @default.
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• W1604742435 date "1987-09-01" @default.
• W1604742435 modified "2023-09-27" @default.
• W1604742435 title "Amino acid substitutions in subunit 9 of the mitochondrial ATPase complex of Saccharomyces cerevisiae. Sequence analysis of a series of revertants of an olil mit- mutant carrying an amino acid substitution in the hydrophilic loop of subunit 9" @default.
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• W1604742435 doi "https://doi.org/10.1111/j.1432-1033.1987.tb13335.x" @default.
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