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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
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Mitochondria are double-membrane organelles of the eukaryotes involved in cellular metabolism, signaling, ATP synthesis, and programmed cell death.  Each of these processes requires specific proteins and enzymes that must be correctly sorted to the right mitochondrial subcompartment for the proper functioning of the organelle.
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Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
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Mitochondrial matrix proteases: quality control and beyond.

Karolina Szczepanowska1,2, Aleksandra Trifunovic1,2

  • 1Institute for Mitochondrial Diseases and Aging, Medical Faculty, University of Cologne, Germany.

The FEBS Journal
|May 10, 2021
PubMed
Summary
This summary is machine-generated.

Mitochondrial proteases LON and ClpXP are crucial for protein quality control and mitochondrial function. Emerging roles in gene expression and respiration, plus their potential as anticancer targets, are highlighted.

Keywords:
ClpXPLONP1metabolismmitochondriamitochondrial matrix proteasesprotein quality controlregulated proteolysisrespiratory chain complexes

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Area of Science:

  • Mitochondrial biology
  • Molecular cell biology
  • Biochemistry

Background:

  • Mitochondria utilize protein quality control (QC) mechanisms involving chaperones and proteases.
  • Mitochondrial proteases are vital for protein homeostasis, preventing toxic aggregate formation.
  • Impaired protease function links to diseases like cancer, metabolic syndromes, and neurodegeneration.

Purpose of the Study:

  • To review the roles of mitochondrial matrix proteases LON and ClpXP.
  • To discuss their established QC functions and newly discovered regulatory roles.
  • To summarize their emerging significance in cancer therapy.

Main Methods:

  • Literature review of scientific articles.
  • Analysis of recent research on LON and ClpXP functions.
  • Synthesis of findings on protease roles in mitochondrial gene expression and respiration.

Main Results:

  • LON and ClpXP are key to mitochondrial protein QC.
  • These proteases regulate mitochondrial gene expression and respiratory chain function.
  • Emerging evidence highlights LON and ClpXP as therapeutic targets in cancer.

Conclusions:

  • Mitochondrial proteases LON and ClpXP have multifaceted roles beyond QC.
  • Their involvement in gene expression and respiration is critical for mitochondrial health.
  • Targeting LON and ClpXP offers promising avenues for anticancer strategies.