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Synapsins as major neuronal Ca2+/S100A1-interacting proteins.

J Heierhorst1, K I Mitchelhill, R J Mann

  • 1St. Vincent's Institute of Medical Research, 41 Victoria Parade, Fitzroy, VIC 3065, Australia. heier@ariel.its.unimelb.edu.au

The Biochemical Journal
|November 24, 1999
PubMed
Summary
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Researchers identified novel mammalian protein kinases regulated by calcium and S100A1 protein. Synapsins were purified and shown to interact with S100A1, suggesting a new regulatory pathway in neurons.

Area of Science:

  • Neurobiology
  • Molecular Biology
  • Biochemistry

Background:

  • S100A1 protein activates invertebrate twitchin kinase, but no mammalian S100-dependent kinases are known.
  • Identifying novel Ca(2+)/S100A1-regulated kinases is crucial for understanding cellular signaling.

Purpose of the Study:

  • To identify novel mammalian protein kinases regulated by Ca(2+) and S100A1.
  • To investigate the interaction between S100A1 and purified protein kinases.

Main Methods:

  • Combined Ca(2+)-dependent affinity chromatography using S100A1 and an ATP analogue on brain extracts.
  • Purification of synapsin isoforms (Ia, Ib, IIa, IIb).
  • BIAcore analysis to study S100A1-synapsin interaction and immunofluorescence microscopy in PC12 cells.

Related Experiment Videos

Main Results:

  • Four major synapsin isoforms were purified to near-homogeneity.
  • Synapsins were specifically affinity-labeled with an ATP analogue.
  • S100A1 demonstrated Ca(2+)-dependent and Zn(2+)-enhanced binding to synapsin IIa with submicromolar affinity.
  • Synapsins and S100A1 co-localize in PC12 cell neurons.

Conclusions:

  • Synapsins are identified as potential novel Ca(2+)/S100A1-regulated protein kinases.
  • The interaction between S100A1 and synapsins suggests a novel regulatory mechanism in neuronal signaling.
  • This finding opens new avenues for research into calcium-mediated cellular processes in the nervous system.