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Related Concept Videos

Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

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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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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...
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Introduction to Membrane Proteins01:16

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The cell membrane, or plasma membrane, is an ever-changing landscape. It is described as a fluid mosaic where various macromolecules are embedded in the phospholipid bilayer. Among the macromolecules are proteins. The protein content varies across cell types. For example, mitochondrial inner membranes contain ~76% protein content, while myelin contains ~18% protein content. Individual cells contain many types of membrane proteins—red blood cells contain over 50—and different cell...
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Plasma membranes have integral transmembrane proteins involved in facilitated transport. These proteins are collectively referred to as transport proteins, and they function as either channels for the material or as carriers themselves. Channel proteins have hydrophilic domains exposed to the intracellular and extracellular fluids and a hydrophilic channel through their core that provides a hydrated opening for solutes to pass through the membrane layers. Passage through the channel allows...
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Detergents are used to purify the integral proteins of the membrane. The hydrophobic portion of the detergent can replace membrane phospholipids while solubilizing the membrane proteins. When detergent monomers reach a specific concentration in a solution called critical micelle concentration (CMC), they form micelles. Above CMC, the concentration of the detergent monomers remains in equilibrium with the micelle. The number of detergent monomers present in the CMC varies for each detergent, and...
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Tuning Protein Diffusivity with Membrane Tethers.

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Researchers developed a new tool to control molecular diffusion in living embryos, enabling precise study of its role in biological processes like embryonic development and enzymatic reactions.

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Area of Science:

  • Biochemistry
  • Developmental Biology
  • Molecular Biology

Background:

  • Diffusion is crucial for biochemical processes, governing molecular movement at small scales and influencing enzymatic reactions.
  • Extracellular diffusion of signaling proteins is believed to limit tissue differentiation during embryonic development.
  • Directly interfering with diffusion processes in vivo for experimental testing remains a significant challenge.

Purpose of the Study:

  • To develop a novel method for experimentally controlling and measuring molecular diffusion in living organisms.
  • To create a tool that can modulate the effective diffusivity of extracellular molecules.
  • To enable functional interference with diffusion-dependent biological processes.

Main Methods:

  • Development of genetically encoded nanobodies to alter protein localization and mobility.
  • Introduction of a membrane-tethered, low-affinity diffusion regulator.
  • Application of the regulator in living embryos to tune extracellular molecule diffusivity.

Main Results:

  • Successfully extended the nanobody toolbox with a novel diffusion regulator.
  • Demonstrated the ability to tune effective diffusivity of extracellular molecules over an order of magnitude.
  • Enabled direct experimental manipulation of diffusion in a biological system.

Conclusions:

  • The developed diffusion regulator offers a new approach to study diffusion-dependent biological phenomena.
  • This tool opens new avenues for investigating the role of diffusion in embryonic development and other processes.
  • Provides a method to functionally interfere with diffusion in vivo, advancing biological research.