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Coarse-Grained Model of SNARE-Mediated Docking.

Nicole Fortoul1, Pankaj Singh2, Chung-Yuen Hui2

  • 1Department of Chemical and Biomolecular Engineering, Lehigh University, Bethlehem, Pennsylvania.

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A new model reveals how SNARE proteins dock synaptic vesicles to the membrane. More than 4-6 SNAREs can actually increase the docking distance, impacting neurotransmission.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Neuroscience

Background:

  • Synaptic transmission relies on vesicles docking to the plasma membrane via the SNARE complex.
  • SNARE proteins mediate attractive forces that overcome vesicle-membrane repulsion.

Purpose of the Study:

  • To model the balance of forces governing vesicle-membrane docking.
  • To investigate the role of SNARE complex number in defining the equilibrium docked state.

Main Methods:

  • Developed a combined model of vesicle/membrane mechanics and a coarse-grained SNARE complex model.
  • Calibrated the SNARE model using all-atom molecular dynamics and laser tweezer experiments.
  • Incorporated membrane deformation, hydration, and electrostatic repulsion forces.

Main Results:

  • A single SNARE complex docks a synaptic vesicle to ~3 nm from the membrane.
  • Increasing SNARE complexes initially shortens the docking distance.
  • An overdocked state (>4-6 SNAREs) paradoxically increases the equilibrium distance.

Conclusions:

  • The number of SNARE complexes critically influences synaptic vesicle docking distance.
  • The balance between SNARE attraction and membrane repulsion dictates docking equilibrium.
  • Understanding this mechanism is key to synaptic transmission regulation.