The biogenesis of mitochondrial intermembrane space proteins

  • 1 Institute of Molecular Cell and Systems Biology, College of Medical, Veterinary and Life Sciences, University of Glasgow, University Avenue, Glasgow, UK
  • 2 Department for Chemistry, Institute for Biochemistry, University of Cologne, 50674 Cologne, Germany
Ruairidh Edwards
  • Institute of Molecular Cell and Systems Biology, College of Medical, Veterinary and Life Sciences, University of Glasgow, University Avenue, Glasgow, G12 8QQ Scotland, UK
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, Sarah Gerlich
  • Institute of Molecular Cell and Systems Biology, College of Medical, Veterinary and Life Sciences, University of Glasgow, University Avenue, Glasgow, G12 8QQ Scotland, UK
  • Department for Chemistry, Institute for Biochemistry, University of Cologne, 50674 Cologne, Germany
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and Kostas TokatlidisORCID iD: https://orcid.org/0000-0001-6295-8183

Abstract

The mitochondrial intermembrane space (IMS) houses a large spectrum of proteins with distinct and critical functions. Protein import into this mitochondrial sub-compartment is underpinned by an intriguing variety of pathways, many of which are still poorly understood. The constricted volume of the IMS and the topological segregation by the inner membrane cristae into a bulk area surrounded by the boundary inner membrane and the lumen within the cristae is an important factor that adds to the complexity of the protein import, folding and assembly processes. We discuss the main import pathways into the IMS, but also how IMS proteins are degraded or even retro-translocated to the cytosol in an integrated network of interactions that is necessary to maintain a healthy balance of IMS proteins under physiological and cellular stress conditions. We conclude this review by highlighting new and exciting perspectives in this area with a view to develop a better understanding of yet unknown, likely unconventional import pathways, how presequence-less proteins can be targeted and the basis for dual localisation in the IMS and the cytosol. Such knowledge is critical to understanding the dynamic changes of the IMS proteome in response to stress, and particularly important for maintaining optimal mitochondrial fitness.

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