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Cotranslational Protein Translocation01:20

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Translocation of proteins across membranes is an ancient process that occurs even in bacteria and archaebacteria. In fact, the components of the translocation machinery are still conserved between prokaryotes and eukaryotes.
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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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Mitochondrial protein import is powered by two distinct energy sources: ATP hydrolysis and electrochemical potential across the inner membrane. Newly synthesized precursors are bound by cytosolic chaperones of the Hsp70 family, which guide them to the import receptors on the mitochondrial surface. Utilizing the energy of ATP hydrolysis, Hsp70 chaperones transfer these precursors to the TOM receptors on the mitochondrial outer membrane.
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The changing landscape in translocator protein (TSPO) function.

Vimal Selvaraj1, Douglas M Stocco2

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Translocator protein (TSPO) is a mitochondrial protein. Recent research re-evaluates its roles in cholesterol transport and mitochondrial function, impacting its potential as a therapeutic target.

Keywords:
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Area of Science:

  • Mitochondrial biology
  • Molecular cell biology
  • Biochemistry

Background:

  • Translocator protein (TSPO), formerly peripheral benzodiazepine receptor (PBR), is an outer mitochondrial membrane protein.
  • TSPO was thought to interact with steroidogenic acute regulatory protein (StAR) for cholesterol transport and be part of the mitochondrial permeability transition pore (MPTP).

Purpose of the Study:

  • To review the historical understanding of TSPO functions.
  • To discuss recent findings that challenge established TSPO roles.
  • To re-evaluate TSPO's significance as a therapeutic and diagnostic target.

Main Methods:

  • Literature review of historical and recent research on TSPO.
  • Analysis of functional experiments and debates surrounding TSPO.
  • Synthesis of current understanding and future implications.

Main Results:

  • Established functions of TSPO in cholesterol transport and MPTP are being re-evaluated.
  • New insights suggest a revised understanding of TSPO's molecular mechanisms.
  • These changes necessitate a reassessment of TSPO's utility.

Conclusions:

  • Recent advances necessitate a paradigm shift in understanding TSPO.
  • The evolving view of TSPO impacts its future development as a biomarker and therapeutic agent.
  • Further research is crucial to fully elucidate TSPO's complex roles.