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Updated: Jul 11, 2026

A Proteoliposome-Based Efflux Assay to Determine Single-molecule Properties of Cl- Channels and Transporters
Published on: April 20, 2015
1Department of Membrane Research, Weizmann Institute of Science, Rehovot, Israel.
This study proposes a new way that hydrogen and hydroxide ions move through water. The researchers suggest that special water structures, called zwitterionic water chains, can span hydrophobic regions like lipid layers. These chains have H+ at one end and OH- at the other, allowing ions to move through otherwise impermeable barriers. The model explains why ion flux is high and why it doesn't strongly depend on pH. Computational simulations were used to test the stability of these chains. The findings support the idea that these structures are effective at ion transport. This approach could help explain how ions move in biological systems, such as cell membranes. The study provides a new perspective on the physics of ion conduction in water.
07:38Functional Characterization of Na+/H+ Exchangers of Intracellular Compartments Using Proton-killing Selection to Express Them at the Plasma Membrane
Published on: March 30, 2015
11:51Application of Electrophysiology Measurement to Study the Activity of Electro-Neutral Transporters
Published on: February 3, 2018
Area of Science:
Background:
The movement of hydrogen and hydroxide ions through water has long been a subject of scientific inquiry. It was already known that water facilitates ion transport, but the exact mechanisms remained unclear. Researchers have explored how ions move across hydrophobic barriers, such as lipid bilayers. This gap motivated further investigation into the role of water structures in ion conduction. No prior work had resolved the weak pH dependence of ion fluxes. Theoretical models have proposed various pathways for ion movement. However, experimental evidence for these models has been limited. This uncertainty drove the need for a new conceptual framework to explain ion transport.
Purpose Of The Study:
This study aimed to propose a novel mechanism for H+ and OH- transport through water. The researchers focused on structures that could span hydrophobic regions. They sought to explain the observed high ion fluxes and weak pH dependence. The motivation came from discrepancies between existing models and experimental data. The study aimed to reconcile these observations with a unified theory. The researchers considered the role of zwitterionic water chains in this process. Their goal was to provide a plausible explanation for the transport mechanism. This approach could help clarify the underlying physics of ion conduction.
Main Methods:
The researchers used theoretical modeling to investigate water structures. They considered the arrangement of water molecules in hydrophobic environments. The study focused on zwitterionic chains with H+ and OH- at opposite ends. Computational simulations were used to test the stability of these structures. The researchers examined how these chains interact with surrounding molecules. They analyzed the energy required to maintain the zwitterionic configuration. The study also considered the movement of ions through these chains. This approach allowed them to evaluate the feasibility of the proposed mechanism.
Main Results:
The study found that zwitterionic water chains can span hydrophobic layers. These chains have H+ at one end and OH- at the other. The researchers observed that these structures can facilitate ion transport. The model showed that these chains allow for high H+/OH- fluxes. The results indicated that the flux is weakly dependent on pH. The simulations supported the idea that these chains are stable in hydrophobic regions. The study also found that the chains can maintain their structure under various conditions. These findings suggest that zwitterionic water chains are effective ion conductors.
Conclusions:
The authors propose that zwitterionic water chains are H+ and OH- conductors. These structures can span hydrophobic regions and facilitate ion transport. The model explains the high fluxes observed in experiments. The weak pH dependence of the flux is attributed to these chains. The study supports the idea that these chains are stable and functional. The researchers suggest that this mechanism could be relevant in biological systems. The findings provide a new perspective on ion conduction in water. This approach could lead to a better understanding of transport processes in membranes.
The study proposes zwitterionic water chains as H+ and OH- conductors, with H+ at one end and OH- at the other.
The chains are structured to extend across the hydrocarbon layer, allowing ion transport through otherwise impermeable barriers.
The model suggests that the zwitterionic chains allow for consistent ion movement regardless of pH changes.
Simulations were used to test the stability and functionality of zwitterionic water chains in hydrophobic environments.
The high flux supports the idea that these chains are effective at facilitating ion transport through hydrophobic layers.
The authors suggest that this mechanism could explain ion transport in biological membranes, such as lipid bilayers.