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Related Concept Videos

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 Transport01:19

Facilitated Transport

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 membrane via...
Facilitated Transport01:19

Facilitated Transport

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 membrane via...
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...

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Protein diffusion in crowded electrolyte solutions.

Felix Roosen-Runge1, Marcus Hennig, Tilo Seydel

  • 1Institut für Angewandte Physik, Universität Tübingen, D-72076 Tübingen, Germany.

Biochimica Et Biophysica Acta
|July 21, 2009
PubMed
Summary
This summary is machine-generated.

Protein crowding significantly impacts molecular motion in solutions. This study reveals how bovine serum albumin (BSA) diffusion dynamics change with concentration, offering insights into protein behavior in crowded biological environments.

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Area of Science:

  • Biophysics
  • Protein Dynamics
  • Solution Chemistry

Background:

  • Proteins in biological systems exist in crowded environments, influencing their behavior.
  • Understanding protein diffusion is crucial for comprehending cellular functions.
  • Previous studies have explored protein interactions, but dynamics under crowding require further investigation.

Purpose of the Study:

  • To investigate the effects of crowding and salt concentration on the diffusion of bovine serum albumin (BSA).
  • To determine the concentration threshold at which protein crowding influences static and dynamic properties.
  • To explore potential charge effects in protein solutions.

Main Methods:

  • Combined cold neutron backscattering and spin-echo techniques for nanosecond diffusion studies.
  • Small-angle X-ray scattering (SAXS) for protein correlation analysis.
  • Systematic variation of protein and NaCl concentrations in aqueous solutions.

Main Results:

  • Nanosecond diffusion of BSA was characterized across various concentrations.
  • Crowding effects on protein dynamics were observed, indicating deviations from independent behavior.
  • SAXS data provided insights into protein correlations under different conditions.

Conclusions:

  • Protein crowding significantly alters the dynamic behavior of bovine serum albumin.
  • The study identifies critical concentrations for the onset of crowding effects.
  • Findings are relevant for understanding protein function in crowded physiological conditions.