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Related Concept Videos

Facilitated Diffusion01:16

Facilitated Diffusion

310
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.
In this process, substrates such as organic compounds and ions interact with a transporter on one side, triggering conformational changes in proteins that enable...
310
Passive Diffusion: Overview and Kinetics01:17

Passive Diffusion: Overview and Kinetics

407
Passive diffusion is a critical process that allows small lipophilic drugs to cross the cell membrane along a concentration gradient. This mechanism's efficiency depends on four primary factors: the membrane's surface area, the drug's lipid-water partition coefficient, the concentration gradient, and the membrane's thickness.
When administered orally, drugs establish a substantial concentration gradient between the gastrointestinal (GI) lumen and the bloodstream, expediting...
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Diffusion01:21

Diffusion

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Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
3.9K
Facilitated Transport01:19

Facilitated Transport

123.7K
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...
123.7K
Pore Transport and Ion-Pair Transport01:17

Pore Transport and Ion-Pair Transport

363
Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited  but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
363
Carrier-Mediated Transport01:06

Carrier-Mediated Transport

271
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.
Active transport involves two types of membrane-spanning transporters: uptake and efflux. Uptake transporters are expressed in the small...
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Mapping Molecular Diffusion in the Plasma Membrane by Multiple-Target Tracing MTT
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Mapping Molecular Diffusion in the Plasma Membrane by Multiple-Target Tracing MTT

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Enhanced diffusion through multivalency.

Ladislav Bartoš1,2, Mikael Lund3,4, Robert Vácha1,2,5

  • 1CEITEC - Central European Institute of Technology, Kamenice 753/5, 625 00 Brno, Czech Republic.

Soft Matter
|December 4, 2024
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Summary
This summary is machine-generated.

Multivalency significantly accelerates particle diffusion along surfaces by spreading binding affinity across multiple sites. This enhances mobility for nanoparticles and viruses, crucial for applications like drug delivery.

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Area of Science:

  • Biophysics
  • Nanotechnology
  • Surface Science

Background:

  • Diffusion of macromolecules, nanoparticles, viruses, and bacteria is critical for biological targeting.
  • The influence of multivalency (multiple binding sites) on surface diffusion remains poorly understood.

Purpose of the Study:

  • To investigate the effect of multivalency on particle diffusion along surfaces.
  • To explore how multivalency impacts particle mobility and binding dynamics.

Main Methods:

  • Numerical simulations were employed to model particle diffusion.
  • The study analyzed the relationship between valency, binding affinity, and diffusion rates.

Main Results:

  • Increasing valency leads to significant diffusion acceleration, even with constant overall affinity.
  • Multivalency enables near-unrestricted diffusion for particles that would be immobilized if monovalent.
  • Diffusion of multivalent particles can be controlled by patterned host receptors.

Conclusions:

  • Multivalency is a key factor in enhancing particle diffusion along surfaces.
  • Understanding multivalency effects can guide the design of nanoparticles for improved drug delivery and diagnostics.