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Protein Dynamics in Living Cells01:19

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Intracellular dynamics of ubiquitin-like 3 visualized using an inducible fluorescent timer expression system.

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Ubiquitin-like 3 (UBL3) protein dynamics were visualized, revealing its movement from cytosol to multivesicular bodies (MVBs). This protein associates with α-tubulin before MVB localization, impacting small extracellular vesicle (sEV) cargo.

Keywords:
Fluorescent timersMultivesicular bodies (MVBs)Post-translational modification (PTM)Ubiquitin-like 3 (UBL3)

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Extracellular Vesicles

Background:

  • Exosomes (small extracellular vesicles, sEVs) mediate cell-cell communication.
  • Ubiquitin-like 3 (UBL3) is a novel post-translational modification affecting sEV protein sorting.
  • UBL3 localizes to multivesicular bodies (MVBs) and the plasma membrane, and is released in sEVs.

Purpose of the Study:

  • To investigate the intracellular dynamics and spatiotemporal localization of UBL3.
  • To understand UBL3's movement and substrate association before MVB entry.

Main Methods:

  • Construction of a fluorescent timer-based visualization system for UBL3 under Tet-on regulation.
  • Live-cell imaging to track UBL3's intracellular movement.
  • Super-resolution microscopy to analyze UBL3's association with substrates like α-tubulin.

Main Results:

  • UBL3 initially distributes in the cytosol after synthesis.
  • UBL3 progressively localizes to the plasma membrane and then accumulates in MVBs.
  • UBL3 forms a complex with α-tubulin in the cytosol, which is then transported to MVBs.

Conclusions:

  • A novel spatiotemporal visualization system elucidates UBL3 intracellular dynamics.
  • UBL3 associates with α-tubulin in the cytosol prior to MVB localization.
  • This provides a foundation for studying UBL3 interactions before MVB sorting and sEV release.