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Structure/function analysis of yeast mitochondrial ATP synthase subunit 8.

R J Devenish1, T Papakonstantinou, M Galanis

  • 1Department of Biochemistry, Monash University, Clayton, Victoria, Australia.

Annals of the New York Academy of Sciences
|November 30, 1992
PubMed
Summary

Subunit 8 of yeast mitochondrial ATP synthase is crucial for F0 sector assembly. Its charged C-terminal residues, particularly Arg37 and Arg42, are vital for efficient function and assembly within the mitochondrial ATP synthase.

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Area of Science:

  • Mitochondrial biogenesis
  • Protein structure-function relationships
  • Enzyme assembly

Background:

  • Subunit 8 is a hydrophobic component of the F0 sector in yeast mitochondrial ATP synthase.
  • Its structure includes a conserved N-terminal region, a central hydrophobic region, and a C-terminal region with charged residues.

Purpose of the Study:

  • To investigate structure/function relationships of yeast mitochondrial ATP synthase subunit 8.
  • To elucidate the roles of its N-terminal, central hydrophobic, and C-terminal domains.

Main Methods:

  • Site-directed mutagenesis to alter subunit 8.
  • In vitro import and assembly assays.
  • An in vivo allotopic expression system in yeast.

Main Results:

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  • The N-terminal region is functionally important in the F0 sector.
  • The central hydrophobic region's role as a transmembrane stem is questioned due to tolerance of charged residues.
  • All three C-terminal charged residues are required for efficient subunit 8 assembly, with Arg37 and Arg42 being most critical.

Conclusions:

  • Yeast mitochondrial ATP synthase subunit 8 assembly and function are critically dependent on its C-terminal charged residues.
  • The N-terminal region plays a functional role in the F0 sector.
  • The proposed transmembrane role of the central hydrophobic region requires re-evaluation.