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Active fusion and fission processes on a fluid membrane
1Raman Research Institute, C.V. Raman Avenue, Sadashivanagar, Bangalore 560080, India.
Physical Review Letters
|October 3, 2001
Summary
Particles interacting with fluid membranes can either stabilize them or cause instabilities. Membrane fusion and fission events can suppress fluctuations or lead to tubular structures resembling cellular compartments.
Area of Science:
- Biophysics
- Cell Biology
- Soft Matter Physics
Background:
- Fluid membranes are fundamental to cellular structure and function.
- Membrane dynamics are influenced by interactions with internal and external components.
- Understanding these interactions is key to deciphering cellular processes like transport and division.
Purpose of the Study:
- To investigate the effects of particle deposition (fusion) and pinching off (fission) on fluid membrane stability.
- To characterize the steady states and dynamical instabilities arising from these membrane events.
- To explore the morphological consequences of membrane fusion and fission.
Main Methods:
- Theoretical modeling of membrane dynamics.
- Computer simulations of particle-membrane interactions.
- Analysis of membrane shape fluctuations and stability criteria.
Main Results:
- Fusion/fission events can lead to stable membrane states by suppressing long wavelength fluctuations.
- Under certain conditions, these events trigger instabilities, causing the membrane to form long tubular structures.
- The observed tubular structures share morphological similarities with cellular endosomal compartments and internal membrane folds.
Conclusions:
- Particle-mediated fusion and fission are critical mechanisms influencing fluid membrane behavior.
- These processes can dynamically alter membrane morphology, leading to structures relevant to cellular organization.
- The study provides insights into the physical basis of membrane shape changes observed in biological systems.