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Videos de Conceptos Relacionados

Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

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...
Diffusion01:12

Diffusion

Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
Diffusion01:21

Diffusion

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...
Facilitated Diffusion01:16

Facilitated Diffusion

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...
The Significance of Membrane Transport01:44

The Significance of Membrane Transport

The transport of solutes across the cell membrane is essential for metabolic processes, like maintaining cell size and volume, generating the action potential, exchanging nutrients and gases, etc. Membrane transport can be either passive or active. It can be simple diffusion, facilitated, or mediated transport aided by transport proteins such as transporters and channels.
Transporters facilitate either an active or passive movement of solutes. They can allow a single-molecule transport down its...
Overview of Protein Sorting and Transport01:45

Overview of Protein Sorting and Transport

Eukaryotic cells have different membrane-bound organelles with distinct protein requirements. The process by which proteins are targeted to a specific organelle is called protein sorting.
Protein sorting can be of two types: signal-based sorting and vesicle-based trafficking. In signal-based sorting, specific amino acid sequences called sorting signals target proteins to the proper location inside the cell either via gated transport or by protein translocation.  In gated transport, folded...

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Video Experimental Relacionado

Updated: Jun 21, 2026

Lateral Diffusion and Exocytosis of Membrane Proteins in Cultured Neurons Assessed using Fluorescence Recovery and Fluorescence-loss Photobleaching
11:58

Lateral Diffusion and Exocytosis of Membrane Proteins in Cultured Neurons Assessed using Fluorescence Recovery and Fluorescence-loss Photobleaching

Published on: February 29, 2012

Difusión lateral de las proteínas de la membrana.

Sivaramakrishnan Ramadurai1, Andrea Holt, Victor Krasnikov

  • 1Department of Biochemistry, Groningen Biomolecular science and Biotechnology Institute & Zernike Institute of Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.

Journal of the American Chemical Society
|August 14, 2009
PubMed
Resumen

Se midió la movilidad de las proteínas de la membrana integral en las vesículas unilamellares gigantes (VUG). La difusión de proteínas se ralentiza con el aumento de la concentración, siguiendo el modelo de Saffman-Delbruck en bajas densidades.

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Lateral Diffusion and Exocytosis of Membrane Proteins in Cultured Neurons Assessed using Fluorescence Recovery and Fluorescence-loss Photobleaching
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Área de la Ciencia:

  • La biofísica es la biofísica.
  • Biología de la Membrana Biología de la Membrana.
  • Dinámica de las proteínas Dinámica de las proteínas.

Sus antecedentes:

  • Las proteínas de la membrana integral son cruciales para las funciones celulares.
  • Comprender su movilidad lateral es clave para comprender la organización y función de la membrana.
  • Los modelos anteriores como el de Saffman-Delbruck proporcionan un marco para la difusión de proteínas en las bicapas lipídicas.

Objetivo del estudio:

  • Para cuantificar la movilidad lateral de varias proteínas de membrana integral dentro de las vesículas unilamellares gigantes (VUG).
  • Investigar la influencia de la concentración y el tamaño de las proteínas en los coeficientes de difusión.
  • Evaluar la aplicabilidad del modelo de Saffman-Delbruck en diferentes condiciones.

Principales métodos:

  • Se empleó la espectroscopia de correlación de fluorescencia (FCS, por sus siglas en inglés) para medir la difusión lateral.
  • Las proteínas de membrana integral (receptores, canales, transportadores) y un péptido alfa-helical fueron etiquetados con fluorescencia.
  • Las proteínas se reconstituyeron en GUV en diferentes proporciones de proteínas a lípidos.

Principales resultados:

  • En densidades bajas de proteínas (10-100 proteínas/μm2), los coeficientes de difusión mostraron una débil dependencia del radio de la proteína, alineándose con el modelo de Saffman-Delbruck.
  • A altas densidades de proteínas (hasta 3000 proteínas/μm2), la difusión lateral disminuyó linealmente con el aumento de la concentración de proteínas.
  • Los hallazgos sugieren un impacto significativo de la aglomeración de proteínas en la movilidad.

Conclusiones:

  • Las interacciones proteína-proteína y el hacinamiento de la membrana impactan significativamente la movilidad lateral.
  • Las mediciones de difusión se pueden utilizar para inferir la geometría de la proteína y el estado de oligomerización.
  • El estudio proporciona información sobre la dinámica de las proteínas relevantes para las membranas biológicas abarrotadas.