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Protein Diffusion in the Membrane01:24

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The chemical and physical properties of plasma membranes cause them to be selectively permeable. Since plasma membranes have both hydrophobic and hydrophilic regions, substances need to be able to transverse both regions. The hydrophobic area of membranes repels substances such as charged ions. Therefore, such substances need special membrane proteins to cross a membrane successfully. In  facilitated transport, also known as facilitated diffusion, molecules and ions travel across a...
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ATP synthase or ATPase is among the most conserved proteins found in bacteria, mammals, and plants. This enzyme can catalyze a forward reaction in response to the electrochemical gradient, producing ATP from ADP and inorganic phosphate. ATP synthase can also work in a reverse direction by hydrolyzing ATP and generating an electrochemical gradient. Different forms of ATP synthases have evolved special features to meet the specific demands of the cell. Based on their specific feature, ATP...
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Secretory vesicles, also known as dense core vesicles (DCVs), are membrane-bound vesicles that transport secretory proteins, such as hormones or neurotransmitters. Regulated secretory vesicles transport proteins from the trans-Golgi network to the exterior of the cell. Proteins present in regulated secretory vesicles are required to be rapidly exocytosed in large amounts upon a specific stimulus.
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Force Generation by Enhanced Diffusion in Enzyme-Loaded Vesicles.

Eike Eberhard1, Ludwig Burger1, César L Pastrana1

  • 1Physics of Complex Biosystems, Department of Bioscience, School of Natural Sciences, Technical University of Munich, 85748 Garching, Germany.

Nano Letters
|March 26, 2025
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Summary
This summary is machine-generated.

Enhanced diffusion, where enzyme activity increases with substrate concentration, causes enzyme-loaded vesicles to move and deform in substrate gradients. This phenomenon offers potential for synthetic transporters.

Keywords:
chemotactic motionenhanced diffusionenzymesmicroswimmerself-propelled particlesvesicles

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Area of Science:

  • Biophysics
  • Chemical Engineering
  • Materials Science

Background:

  • Enzyme diffusion coefficients can increase with substrate concentration, a process termed enhanced diffusion.
  • Enhanced diffusion in substrate gradients leads to non-uniform enzyme distribution and enzymatic drift.
  • Understanding these effects is crucial for enzyme-based systems and biomimetic technologies.

Purpose of the Study:

  • To investigate the impact of enhanced diffusion on enzyme-loaded vesicles within external substrate gradients.
  • To analyze the resulting enzyme distribution and its consequences on vesicle dynamics.
  • To develop a model for predicting vesicle behavior and propulsion based on tunable parameters.

Main Methods:

  • Utilized computer simulations to model enzyme-loaded vesicles in substrate gradients.
  • Employed analytical modeling to characterize vesicle behavior and propulsion.
  • Focused on the phenomenon of enhanced diffusion and its effects on enzyme distribution.

Main Results:

  • Observed that enhanced diffusion generates spatially inhomogeneous enzyme profiles within vesicles.
  • Demonstrated that these inhomogeneous profiles create a pressure gradient across the vesicle.
  • Showcased macroscopically observable effects including vesicle deformation and self-propulsion.

Conclusions:

  • Enhanced diffusion in substrate gradients drives vesicle deformation and self-propulsion.
  • An analytical model was developed to quantify propulsion velocity dependence on experimental parameters.
  • Findings validate enhanced diffusion and suggest applications in synthetic cargo transporters and drug delivery.