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Synapsin I is a highly surface-active molecule.

M F Ho1, M Bähler, A J Czernik

  • 1Rockefeller University, New York, New York 10021-6399.

The Journal of Biological Chemistry
|March 25, 1991
PubMed
Summary
This summary is machine-generated.

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Synapsin I, a key synaptic vesicle protein, demonstrates amphiphilic properties, forming stable monolayers at air-water interfaces. This structural characteristic is present across its sequence, influencing its molecular organization.

Area of Science:

  • Neuroscience
  • Biochemistry
  • Structural Biology

Background:

  • Synapsin I is a neuron-specific phosphoprotein crucial for synaptic vesicle regulation.
  • It binds to synaptic vesicles with high affinity.
  • Previous observations suggested potential amphiphilic properties due to self-association.

Purpose of the Study:

  • To investigate the amphiphilic nature of Synapsin I.
  • To characterize its structural properties at an air-water interface.
  • To propose a molecular topology based on its amphiphilic characteristics.

Main Methods:

  • Surface pressure-area (force-area) isotherms at an air-water interface.
  • Circular dichroism spectroscopy in the presence of trifluoroethanol.
  • Analysis of Synapsin I fragments generated by cysteine-specific cleavage.

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Main Results:

  • Synapsin I forms a stable monolayer at an air-water interface, compressable up to 60 dynes/cm.
  • Circular dichroism spectra indicate secondary structure induction by trifluoroethanol.
  • Amphiphilic characteristics were observed throughout the Synapsin I sequence, with the C-terminal region showing reduced surfactant properties.
  • Fragment analysis revealed interactions between specific regions influencing surface area occupation.

Conclusions:

  • Synapsin I possesses significant amphiphilic properties, contributing to its localization and function at synaptic vesicles.
  • A molecular topology model for Synapsin I includes distinct amphiphilic and hydrophilic regions.
  • Phosphorylation state did not significantly alter the observed monolayer properties.