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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.
In this process, substrates such as organic compounds and ions interact with a transporter on one side, triggering conformational changes in proteins that enable...
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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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Protein Diffusion in the Membrane01:24

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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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Rapid, Scalable Assembly and Loading of Bioactive Proteins and Immunostimulants into Diverse Synthetic Nanocarriers Via Flash Nanoprecipitation
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Carga limitada por difusión de un contenedor de proteínas de ingeniería

Reinhard Zschoche1, Donald Hilvert1

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

Journal of the American Chemical Society
|December 5, 2015
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Resumen

Los nanocompartimentos bacterianos diseñados (AaLS-13) encapsulan eficientemente a los huéspedes a través de interacciones electrostáticas. Este proceso es rápido, reversible y sintonizable por la fuerza iónica, ofreciendo ideas para diseñar nuevos complejos huésped-invitado.

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Área de la Ciencia:

  • Biotecnología
  • Biología estructural
  • La biofísica

Sus antecedentes:

  • Los nanocompartimentos bacterianos diseñados como AaLS-13 ofrecen potencial para la encapsulación artificial.
  • Las interacciones electrostáticas son clave para el mecanismo de carga de AaLS-13.
  • La comprensión de la dinámica de encapsulación es crucial para el desarrollo de sistemas huésped-invitado funcionales.

Objetivo del estudio:

  • Investigar la eficiencia de encapsulación y las capacidades de retención del sistema AaLS-13.
  • Desarrollar un método para cuantificar espectroscópicamente la encapsulación de invitados dentro de AaLS-13.
  • Explorar los factores que influyen en el proceso de carga de AaLS-13.

Principales métodos:

  • Desarrollo de un par de proteínas fluorescentes basadas en la transferencia de energía de resonancia de Förster (FRET) para el monitoreo de la encapsulación.
  • Análisis espectroscópico de la cinética y el equilibrio de encapsulación de AaLS-13.
  • Estudios in vitro que varían la fuerza iónica y las concentraciones de los componentes para evaluar la eficiencia de la carga.

Principales resultados:

  • La encapsulación por AaLS-13 es rápida (en un segundo) y reversible.
  • La resistencia iónica influye significativamente en el equilibrio de encapsulación y puede superar los problemas de agregación.
  • El caparazón de AaLS-13 no es del todo rígido, lo que permite una carga dinámica.

Conclusiones:

  • AaLS-13 es un sistema versátil y ajustable para la encapsulación de proteínas.
  • El método basado en FRET es aplicable a la caracterización de otros complejos cápside-carga.
  • Los hallazgos proporcionan una base para la ingeniería de sistemas avanzados de nanocompartimientos funcionales.