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Fusion Pores Live on the Edge.

Edgar M Blokhuis1, Massimo D'Agostino2, Andreas Mayer3

  • 1Leiden Institute of Chemistry (LIC) , Leiden University , 2333 CD Leiden , The Netherlands.

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Summary
This summary is machine-generated.

Biological vesicle fusion pores preferentially form at the edge of contact zones. Increased contact angles between vesicles, facilitated by cellular machinery, significantly enlarge these vertex pores, driving membrane fusion.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Molecular Dynamics

Background:

  • Biological transmission of vesicular content relies on fusion pore opening.
  • Fusion pores in docked vesicles often form at the vertex of flat contact zones.

Purpose of the Study:

  • To model and understand the forces governing fusion pore formation at vesicle contact zone edges.
  • To investigate the role of contact angle in determining fusion pore size.

Main Methods:

  • Coarse-grained molecular simulations.
  • Application of elastic theory to model vesicle-vesicle interactions.
  • Analysis of fusion pore size dependence on contact angle.

Main Results:

  • Fusion pores exhibit a direct attraction towards the vertex of the contact zone.
  • The equilibrium size of the vertex pore is strongly dependent on the apparent contact angle.
  • Larger contact angles lead to substantially increased vertex pore size.

Conclusions:

  • Cellular membrane fusion machinery actively increases contact zone area and angle, thereby driving fusion pore expansion.
  • The fusion machinery can remotely control fusion pore size through geometric effects, not solely via fusion proteins.