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Updated: May 25, 2026

Pulling Membrane Nanotubes from Giant Unilamellar Vesicles
Published on: December 7, 2017
Intermembrane docking reactions are regulated by membrane curvature.
Andreas H Kunding1, Michael W Mortensen, Sune M Christensen
1Bionanotechnology and Nanomedicine Laboratory, Department of Neuroscience and Pharmacology, University of Copenhagen, Copenhagen, Denmark. akunding@me.com
Membrane curvature significantly enhances vesicle docking, increasing efficiency by 30-60 fold. This finding suggests membrane curvature regulates tethering and fusion processes, impacting cellular functions and viral entry.
Area of Science:
- Cell Biology
- Biophysics
Background:
- Eukaryotic cellular membrane polymorphism is crucial for protein localization and membrane fusion.
- Membrane curvature's regulatory roles in spatio-temporal protein localization and membrane fusion are increasingly recognized.
Purpose of the Study:
- To quantify the impact of membrane curvature on the efficiency of intermembrane docking reactions.
- To investigate the relationship between vesicle diameter (curvature) and docking efficiency mediated by SNAREs and streptavidin-biotin.
Main Methods:
- Utilized fluorescence microscopy to monitor single vesicle-vesicle pair docking.
- Experimentally varied vesicle diameter from 30-200 nm to control membrane curvature.
- Employed neuronal soluble N-ethylmaleimide-sensitive factor attachment protein receptors (SNAREs) and streptavidin-biotin as docking mediators.
Main Results:
- Observed a substantial 30-60 fold enhancement in intermembrane docking efficiency with increasing membrane curvature.
- Compared this enhancement to the 2-10 fold acceleration of SNARE-mediated fusion by synaptotagmin and calcium in vitro.
- Developed a biophysical model to explain the observed curvature-dependent docking enhancement.
Conclusions:
- Membrane curvature acts as a potent regulator of intermembrane tethering reactions.
- This curvature-mediated regulation can influence downstream processes, including vesicle fusion.
- The findings suggest a potential role for membrane curvature in viral fusion with target membranes.
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