Import and insertion of proteins into the mitochondrial outer membrane

  • Gordon C. Shore
  • Heidi M. Mcbride
  • Douglas G. Millar
  • Nancy A. E. Steenaart
  • Mai Nguyen
Chapter
Part of the European Journal of Biochemistry book series (EJB REVIEWS, volume 1995)

Abstract

Nuclear-encoded proteins destined for insertion into the mitochondrial outer membrane, follow the same general pathway for import as proteins that are translocated to interior compartments within the organelle. This observation is true both for α-barrel-type proteins and for proteins that contain hydrophobic α-helical transmembrane segments. In this review, we describe what is known about the various steps leading to protein insertion into the outer membrane, and discuss the energetics that favor vectorial translocation into and across this membrane. The selection of the outer membrane during import may involve a lateral release of the translocating polypeptide from the import machinery so that the appropriate domains of the protein become embedded in the lipid bilayer. One type of topogenic domain that can guarantee such selection of the outer membrane is a signal-anchor sequence of the type characterized for the bitopic protein Mas70p. It is suggested that a signal-anchor sequence selective for the mitochondrial outer membrane causes abrogation of polypeptide translocation and triggers the release of the transmembrane segment into the surrounding lipid bilayer, prior to any possibility for the commitment of translocation to the interior of the organelle. Specific structural features of the signal-anchor sequence specify its orientation in the membrane, and can confer on this sequence the ability to form homo-oligomers and hetero-oligomers. Strategies other than a signal-anchor sequence may be employed by other classes of proteins for selection of the outer-membrane. Of note is the ability of the outer-membrane import machinery to catalyze integration of the correct set of proteins into the outer-membrane bilayer, while allowing proteins that are destined for integration into the bilayer of the inner membrane to pass through unimpeded. Again, however, different proteins may employ different strategies. One model proposes that this can be accomplished by a combination of a matrix-targeting signal and a distal stop-transfer sequence. In this model, the formation of contact sites, which is triggered when the matrix-targeting signal engages the import machinery of the inner membrane, may prevent the outer-membrane translocon from recognizing and responding to the downstream stop-transfer domain. This allows the transmembrane segment to pass across the outer-membrane, and subsequently integrate into the inner membrane.

Keywords

Mitochondria proteins outer membrane import signal sequence anchor topology 

Abbreviations

PBF

presequence-binding factor

MSF

mitochondrial import-stimulating factor

AAC

ADP/ATP carrier

UCP

uncoupling protein

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Copyright information

© FEBS 1995

Authors and Affiliations

  • Gordon C. Shore
    • 1
    • 2
  • Heidi M. Mcbride
    • 2
  • Douglas G. Millar
    • 2
  • Nancy A. E. Steenaart
    • 2
  • Mai Nguyen
    • 2
  1. 1.Department of BiochemistryMcGill UniversityMontrealCanada
  2. 2.Department of Biochemistry, McIntyre Medical Sciences BuildingMcGill UniversityMontrealCanada

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