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Mitochondrial presequences are more than just address labels.

Erik Marcel Heller1, Svenja Lenhard1, Doron Rapaport2

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Protein Science : a Publication of the Protein Society
|February 12, 2026
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Mitochondrial protein presequences are more than just targeting signals. They also regulate protein lifespan, prevent premature folding, and direct proteins to multiple cellular locations, crucial for mitochondrial biogenesis.

Keywords:
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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Protein Trafficking

Background:

  • Mitochondrial proteins are synthesized in the cytosol as precursors with N-terminal presequences.
  • These presequences typically act as targeting signals for mitochondrial import.

Purpose of the Study:

  • To explore the multifaceted roles of mitochondrial precursor protein presequences beyond simple targeting.
  • To investigate how presequences influence protein lifespan, folding, and localization.

Main Methods:

  • Analysis of existing literature on mitochondrial protein targeting and biogenesis.
  • Review of studies examining presequence function in protein degradation and chaperone interactions.
  • Examination of data on dually localized proteins and their presequence characteristics.

Main Results:

  • Presequences contain degradation signals, acting as timers for protein lifespan via the ubiquitin-proteasome system.
  • Presequences interact with cytosolic chaperones, preventing or delaying premature protein folding.
  • Some presequences provide targeting information for multiple cellular compartments, including the nucleus and chloroplasts.

Conclusions:

  • Mitochondrial presequences possess complex, multifunctional information critical for protein biogenesis.
  • These signals regulate protein stability, folding, and accurate subcellular localization, ensuring proper mitochondrial function.