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Related Concept Videos

Facilitated Diffusion01:16

Facilitated Diffusion

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The plasma membrane, a critical structure in cellular biology, houses an array of transporters, or carrier proteins, interspersed within its lipid bilayer. These proteins play a crucial role in solute transport through facilitated diffusion, a form of passive diffusion that uses transporters to move the molecules across the membrane.
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Carrier-Mediated Transport01:06

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Carrier-mediated transport is a pivotal process in drug absorption, particularly for lipid-insoluble drugs, and encompasses facilitated diffusion and active transport. Facilitated diffusion allows drugs to move along their concentration gradient without energy expenditure, while active transport utilizes ATP to drive drug movement against this gradient.
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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Certain large, lipid-insoluble drug molecules that resemble amino acids, peptides, or glucose, require specialized carrier proteins to facilitate their diffusion across cell membranes. This transport can occur through either facilitated diffusion, which does not require energy input, or active transport, which does require energy input.
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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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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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Related Experiment Video

Updated: Mar 29, 2026

Rapid, Scalable Assembly and Loading of Bioactive Proteins and Immunostimulants into Diverse Synthetic Nanocarriers Via Flash Nanoprecipitation
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Diffusion-Limited Cargo Loading of an Engineered Protein Container.

Reinhard Zschoche1, Donald Hilvert1

  • 1Laboratory of Organic Chemistry, ETH Zürich , 8093 Zürich, Switzerland.

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Engineered bacterial nanocompartments (AaLS-13) efficiently encapsulate guests via electrostatic interactions. This process is rapid, reversible, and tunable by ionic strength, offering insights for designing new host-guest complexes.

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Area of Science:

  • Biotechnology
  • Structural Biology
  • Biophysics

Background:

  • Engineered bacterial nanocompartments like AaLS-13 offer potential for artificial encapsulation.
  • Electrostatic interactions are key to AaLS-13's cargo loading mechanism.
  • Understanding encapsulation dynamics is crucial for developing functional host-guest systems.

Purpose of the Study:

  • To investigate the encapsulation efficiency and retention capabilities of the AaLS-13 system.
  • To develop a method for spectroscopically quantifying guest encapsulation within AaLS-13.
  • To explore factors influencing the AaLS-13 cargo loading process.

Main Methods:

  • Development of a Förster resonance energy transfer (FRET)-based fluorescent protein pair for encapsulation monitoring.
  • Spectroscopic analysis of AaLS-13 encapsulation kinetics and equilibrium.
  • In vitro studies varying ionic strength and component concentrations to assess loading efficiency.

Main Results:

  • Encapsulation by AaLS-13 is rapid (within one second) and reversible.
  • Ionic strength significantly influences encapsulation equilibrium and can overcome aggregation issues.
  • AaLS-13's shell is not entirely rigid, allowing for dynamic cargo loading.

Conclusions:

  • AaLS-13 is a versatile and tunable system for protein encapsulation.
  • The FRET-based method is applicable to characterizing other capsid-cargo complexes.
  • Findings provide a foundation for engineering advanced functional nanocompartment systems.