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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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Mechanisms of Membrane Domain Formation00:59

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Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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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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Membrane Fluidity01:26

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Membrane fluidity is explained by the fluid mosaic model of the cell membrane, which describes the plasma membrane structure as a mosaic of components—including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character.
Mosaic nature of the membrane
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Membrane Fluidity01:23

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Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.
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How membrane surface affects protein structure.

V E Bychkova1, L V Basova, V A Balobanov

  • 1Institute of Protein Research, Russian Academy of Sciences, Pushchino, Moscow Region, 142290, Russia. bychkova@vega.protres.ru.

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The negatively charged membrane surface can alter protein structure, causing a transition to a more flexible, molten globule-like state. This conformational change enhances protein function and indicates the membrane acts as a cellular denaturing agent.

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Area of Science:

  • Biochemistry
  • Biophysics
  • Cell Biology

Background:

  • Cell membranes possess a negatively charged surface with altered dielectric properties and pH.
  • Understanding protein behavior near membranes is crucial for cellular function.

Purpose of the Study:

  • To investigate protein conformational changes induced by conditions mimicking the membrane surface environment.
  • To elucidate the forces governing protein structure and function at the membrane interface.

Main Methods:

  • Modeling membrane surface conditions using water-alcohol mixtures at low pH.
  • Studying globular protein conformational transitions using biophysical techniques.
  • Analyzing protein behavior in the presence of phospholipid membranes.

Main Results:

  • Proteins transitioned from a native state to a molten globule-like state under simulated membrane conditions.
  • Increased protein structural flexibility was observed, enhancing protein functioning.
  • Experimental data revealed forces influencing protein structure in the membrane field.

Conclusions:

  • The negatively charged membrane surface acts as a moderate denaturing agent.
  • Protein conformational changes near membranes are significant and must be considered.
  • Altered protein flexibility near membranes can facilitate cellular functions.