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Mechanically-gated Ion Channels01:12

Mechanically-gated Ion Channels

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Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
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The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
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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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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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Ligand-gated ion channels are transmembrane proteins with a channel for ions to pass through and a binding site for a ligand. The channel opens only when a ligand attaches to the binding site.
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Ion channels are specialized proteins on the plasma membrane that allow charged ions to pass down their electrochemical gradient. Their main function is to maintain the membrane potential which is critical for cell viability. These channels are either gated or non-gated and can transport more than a thousand ions within milliseconds for the cellular event to occur.
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Molecular Jamming in Tortuous Nanochannels.

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Freestanding carbon nanomembranes (CNMs) can dehydrate alcohols at room temperature. Stacking two CNM layers completely rejects organic molecules, creating a "molecular jam" that slows water diffusion.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Separation Science

Background:

  • Ultrathin nanostructured membranes are crucial for processes like air separation and desalination.
  • Carbon nanomembranes (CNMs) offer unique properties for molecular separation applications.

Purpose of the Study:

  • To investigate the use of freestanding CNMs for dehydrating vaporous alcohols at room temperature.
  • To analyze the structural properties and separation performance of CNMs using homologous n-alkanols and a heavy water/n-propanol azeotrope.

Main Methods:

  • Permeation rate measurements of n-alkanols to characterize CNM structure.
  • Separation experiments using a model heavy water/n-propanol azeotrope.
  • Analysis of transmembrane diffusion in single-layer and stacked CNM configurations.

Main Results:

  • Ordinary nanomembranes exhibited moderate selectivity (around 300).
  • Stacked two-layer CNMs achieved complete rejection of organic molecules.
  • A 10-fold slowdown in water transmembrane diffusion was observed in stacked CNMs compared to single-layer membranes.

Conclusions:

  • Stacked CNMs demonstrate exceptional performance in dehydrating alcohols.
  • The "molecular jam" effect in interlayer spacing hinders water diffusion, enhancing separation.
  • This study provides insights into molecular transport phenomena under nanoconfinement conditions.