Function and redox state of mitochondrial localized cysteine-rich proteins important in the assembly of cytochrome c oxidase

Oleh Khalimonchuk, Dennis R. Winge

Research output: Contribution to journalReview article

25 Scopus citations


The cytochrome c oxidase (CcO) complex of the mitochondrial respiratory chain exists within the mitochondrial inner membrane (IM). The biogenesis of the complex is a multi-faceted process requiring multiple assembly factors that function on both faces of the IM. Formation of the two copper centers of CcO occurs within the intermembrane space (IMS) and is dependent on assembly factors with critical cysteinyl thiolates. Two classes of assembly factors exist, one group being soluble IMS proteins and the second class being proteins tethered to the IM. A common motif in the soluble assembly factors is a duplicated Cx9C sequence motif. Since mitochondrial respiration is a major source of reactive oxygen species, control of the redox state of mitochondrial proteins is an important process. This review documents the role of these cysteinyl CcO assembly factors within the IMS and the necessity of redox control in their function.

Original languageEnglish (US)
Pages (from-to)618-628
Number of pages11
JournalBiochimica et Biophysica Acta - Molecular Cell Research
Issue number4
StatePublished - Apr 1 2008



  • Copper
  • Cytochrome oxidase
  • Intermembrane space
  • Mitochondria

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

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