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Current Genetics

, Volume 8, Issue 2, pp 135–146 | Cite as

Biogenesis of Mitochondria: Genetic and molecular analysis of the oli2 region of mitochondrial DNA in Saccharomyces cerevisiae

  • Charles E. Novitski
  • Ian G. Macreadie
  • Ronald J. Maxwell
  • H. B. Lukins
  • Anthony W. Linnane
  • Phillip Nagley
Article

Summary

A genetic and molecular analysis of the oli2 region in mitochondrial DNA of Saccharomyces cerevisiae has been carried out. The oli2 gene codes for subunit 6 of the mitochondrial ATPase complex. We have isolated a series of 41 mit, temperature sensitive and oligomycin resistant mutants containing mutations located in the oli2 region. In addition the sequence in wild type mtDNA of 2820 nucleotides covering the oli2 gene and its flanking regions has been determined. A library of petite mutants which have various deletion end points in the oli2 region has been used to generate marker rescue data that allow the assignment of each mit, temperature sensitivity and oligomycin resistance mutation to one of seven uniquely ordered genetic groups. The following physical reference points allow the limits of the physical map positions of a number of the genetic groups to be established: DNA sequence data have been obtained for three of the petites so as to determine unambiguously their relevant deletion end points and the base substitution constituting the mtDNA sequence change in one oligomycin resistant mutant [oli2-23r] has been determined to lie at nucleotide +523 of the oli2 coding region. One group of mit mutations (group N) are known to map within the aap1 gene that is found some 700 bases upstream of the oli2 gene, and which codes for subunit 8 of the mitochondrial ATPase complex. Mutations in the remaining six groups (A-F) map within (or very close to) the coding region of the oli2 gene. Various features of the DNA sequence in and around the oli2 gene are considered, including protein coding regions, sequence divergence in the A,T-rich spacer regions, properties of G,C-rich clusters, and potential ribosome binding sites. Consideration of the transcriptional map of this region of mtDNA suggests that an abundant 4,500 nucleotide transcript may represent the first defined example of a dicistronic messenger RNA in yeast mitochondria carrying distinct coding regions (aap1 and oli2) for two different proteins.

Key words

Yeast mitochondria Mapping of mutations Mitochondrial DNA sequence Mitochondrial ATPase complex 

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Copyright information

© Springer-Verlag 1984

Authors and Affiliations

  • Charles E. Novitski
    • 1
  • Ian G. Macreadie
    • 1
  • Ronald J. Maxwell
    • 1
  • H. B. Lukins
    • 1
  • Anthony W. Linnane
    • 1
  • Phillip Nagley
    • 1
  1. 1.Department of BiochemistryMonash UniversityClaytonAustralia

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