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Rapid Ca2+-dependent decrease of protein ubiquitination at synapses.

Hong Chen1, Simona Polo, Pier Paolo Di Fiore

  • 1Howard Hughes Medical Institute and Department of Cell Biology, Yale University School of Medicine, New Haven, CT 06510, USA.

Proceedings of the National Academy of Sciences of the United States of America
|December 6, 2003
PubMed
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Calcium influx rapidly decreases protein ubiquitination in neurons and other cells, impacting synaptic function and protein turnover. This calcium-dependent process is reversible and linked to protein dephosphorylation.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Protein ubiquitination regulates crucial cellular processes, including axonal growth and synaptic plasticity.
  • Dysregulation of protein ubiquitination is linked to neurodegenerative diseases.

Purpose of the Study:

  • To investigate the rapid effects of calcium influx on protein ubiquitination in neuronal and non-neuronal cells.
  • To explore the relationship between calcium signaling, protein ubiquitination, and dephosphorylation.

Main Methods:

  • Utilized synaptosomes to study depolarization-dependent calcium influx.
  • Employed ionomycin to induce calcium entry in non-neuronal cells.
  • Investigated the role of calcineurin antagonist FK506.

Related Experiment Videos

Main Results:

  • Depolarization-induced calcium influx caused a rapid, global, and reversible decrease in protein ubiquitination.
  • This decrease correlated with Ca2+-dependent dephosphorylation of synaptic proteins.
  • The effect was observed in both synaptosomes and non-neuronal cells and was blocked by FK506.

Conclusions:

  • Revealed a fast, regulated turnover of protein ubiquitination in response to calcium signaling.
  • Suggests protein ubiquitination plays a role in synaptic function, vesicle traffic, and protein turnover coordination in nerve terminals.