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The Significance of Membrane Transport

The Significance of Membrane Transport

The transport of solutes across the cell membrane is essential for metabolic processes, like maintaining cell size and volume, generating the action potential, exchanging nutrients and gases, etc. Membrane transport can be either passive or active. It can be simple diffusion, facilitated, or mediated transport aided by transport proteins such as transporters and channels.
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Membrane Asymmetry Regulating Transporters

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Enzymes like flippase, floppase, and scramblase transfer phospholipids from one layer to another in the membrane, thereby affecting membrane asymmetry.
Flippase
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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...

Primary Active Transport

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Transcellular Transport of Solutes

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Pore Transport and Ion-Pair Transport

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Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...

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Ionic Transport in Electrostatic Janus Membranes. An Explicit Solvent Molecular Dynamic Simulation.

Joan M Montes de Oca^1,2, Johnson Dhanasekaran^1,2, Andrés Córdoba^1,2

¹Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States.

|March 1, 2022

Summary

This summary is machine-generated.

Janus pores act as ionic current rectifiers, with efficiency increasing as pores shrink. Molecular simulations reveal water reorientation and ion segregation, leading to a new model where electric leakage controls transport.

Keywords:

Janus membrane ionic transport nanofluidics nonequilibrium molecular dynamics power generation

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Published on: January 25, 2020

Area of Science:

Nanotechnology
Physical Chemistry
Materials Science

Background:

Janus membranes, featuring two-sided charges, show potential as ionic current rectifiers.
Ionic current rectification is achieved by creating a current from salinity gradients using pores with opposite charge regions.
The efficiency of nanoscale Janus pores is inversely related to their diameter.

Purpose of the Study:

To investigate the molecular mechanisms underlying rectification in Janus nanopores under an applied electric field.
To understand the structure and dynamics of water and ions within Janus nanopores.

Main Methods:

Utilizing molecular simulations with explicit water and ions.
Analyzing the behavior of molecular species in aqueous electrolyte solutions.
Comparing simulation results with experimental observations on asymmetric membranes.

Main Results:

Simulation results align with experimental observations for macroscopic properties.
Identified pronounced local reorientation of water molecules within the pores.
Observed segregation of ionic species, not predicted by continuum models.
Developed a new model for ionic current rectification.

Conclusions:

Electric leakage at the pore entrance is a critical factor controlling net ionic transport in Janus nanopores.
Molecular simulations provide unprecedented insight into the nanoscale phenomena governing ionic rectification.
The findings advance the understanding and design of advanced ionic devices.