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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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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...
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Passive diffusion is a critical process that allows small lipophilic drugs to cross the cell membrane along a concentration gradient. This mechanism's efficiency depends on four primary factors: the membrane's surface area, the drug's lipid-water partition coefficient, the concentration gradient, and the membrane's thickness.
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Proton Diffusion through Bilayer Pores.

Jesse G McDaniel1, Arun Yethiraj1

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This summary is machine-generated.

Proton transport is faster in hydrophobic nanoconfined pores than at surfaces. This is due to the chemical nature of the interface and hydrogen bond networks, impacting biological and material systems.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Biophysics

Background:

  • Proton transport in confined environments is crucial for biological processes and materials.
  • Lyotropic liquid crystals (LLCs) offer tunable nanoconfined aqueous environments.
  • Understanding proton diffusion mechanisms at interfaces is key to controlling these processes.

Purpose of the Study:

  • To investigate proton transport mechanisms within a nanoconfined bilayer pore.
  • To elucidate the role of interface chemistry and confinement on proton diffusion.
  • To compare proton transport dynamics inside and outside the pore.

Main Methods:

  • Multistate empirical valence bond (MS-EVB) simulations.
  • Modeling proton transport in a lamellar Lβ phase LLC.
  • Analysis of proton diffusion pathways and hydrogen bond networks.

Main Results:

  • Proton diffusion is significantly faster within the hydrophobic bilayer pore compared to the bilayer surface.
  • Surface transport along hydrophobic pockets and hydrogen bond continuity govern diffusion.
  • The fraction of Zundel intermediates, key to Grotthuss mechanism, is reduced at the bilayer surface but similar to bulk water within the pore.

Conclusions:

  • The chemical nature of the confining interface is a critical factor in local proton transport.
  • Confinement length scale and interface hydrophobicity significantly influence proton diffusion dynamics.
  • These findings have implications for understanding proton transfer in complex biological and synthetic systems.