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Pathways of Unconventional Protein Secretion.

Catherine Rabouille1

  • 1Hubrecht Institute of the KNAW and UMC Utrecht, Utrecht, The Netherlands; Department of Cell Biology, UMC Utrecht, Utrecht, The Netherlands; Department of Cell Biology, UMC Groningen, Groningen, The Netherlands.

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Summary
This summary is machine-generated.

Unconventional protein secretion (UPS) bypasses traditional cell transport routes, enabling proteins without signal peptides to exit cells, often triggered by stress. This review explores emerging insights into these complex pathways.

Keywords:
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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Secretory proteins conventionally travel via ER and Golgi to the plasma membrane.
  • Numerous proteins utilize alternative, unconventional pathways for secretion.
  • Unconventional protein secretion (UPS) is crucial for specific cellular functions.

Purpose of the Study:

  • To review recent findings and concepts defining unconventional protein secretion pathways.
  • To elucidate the mechanisms of cargo transport bypassing conventional routes.
  • To highlight the role of stress in triggering UPS.

Main Methods:

  • Literature review of recent research on UPS.
  • Analysis of studies investigating protein translocation across the plasma membrane.
  • Examination of pathways that bypass the Golgi apparatus.

Main Results:

  • UPS involves proteins lacking signal peptides or transmembrane domains.
  • Some UPS cargos bypass the Golgi apparatus despite ER entry.
  • Stress is a primary trigger for most unconventional secretion events.

Conclusions:

  • Unconventional protein secretion represents a diverse set of pathways.
  • Further research is needed to fully characterize UPS mechanisms.
  • Understanding UPS is vital for comprehending cellular responses to stress.