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Related Experiment Videos

Physiological modulation of rabphilin phosphorylation.

D L Foletti1, J T Blitzer, R H Scheller

  • 1Howard Hughes Medical Institute, Department of Molecular and Cellular Physiology, Stanford University School of Medicine, Stanford, California 94305-5428, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|July 24, 2001
PubMed
Summary

Phosphorylation dynamically regulates rabphilin, a protein crucial for synaptic plasticity. This study reveals how rabphilin

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Protein phosphorylation is key to synaptic plasticity.
  • Lack of specific reagents hinders study of phosphorylated proteins.
  • Rabphilin's role in synaptic transmission is under investigation.

Purpose of the Study:

  • To investigate the physiological modulation of rabphilin using phosphospecific antibodies.
  • To understand the role of rabphilin phosphorylation in synaptic vesicle exocytosis.

Main Methods:

  • Utilized phosphospecific antibodies to detect phosphorylated rabphilin.
  • Analyzed rabphilin phosphorylation under basal and stimulated conditions.
  • Investigated the dependence of phosphorylation on external Ca(2+) and Rab3a.

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Main Results:

  • Rabphilin phosphorylation on Ser-234 and Ser-274 is dynamically regulated by kinases and phosphatases.
  • Phosphorylation is maximal under depolarizing conditions triggering exocytosis.
  • Ca(2+) and Rab3a are critical for rabphilin phosphorylation.
  • Phosphorylated rabphilin shows reduced membrane affinity.

Conclusions:

  • Rabphilin is phosphorylated on synaptic vesicles by Ca(2+)-dependent kinases during exocytosis.
  • Modulation of membrane association by phosphorylation may regulate synaptic vesicle cycling.
  • This phosphorylation event could be crucial for vesicle mobilization in neurotransmission.