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Channel Rhodopsins

Channel Rhodopsins

Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some bacteria, phytochromes in plants, and rhodopsins in the photoreceptor cells of the vertebral retina. The light-sensitive property of these receptors is because of the bound chromophores, such as bilin in the phytochromes and retinal in the rhodopsins.
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...

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Light-responsive nanochannels based on the supramolecular host-guest system.

Jiaxin Quan¹, Ying Guo¹, Junkai Ma²

¹School of Chemical and Environmental Engineering, Hanjiang Normal University, Shi Yan, China.

Frontiers in Chemistry

|October 10, 2022

Summary

Researchers developed light-responsive nanochannels using host-guest systems. These biomimetic channels offer improved stability and tunable properties for controlled molecular transport and release.

Keywords:

functional nanochannels host–guest system light response mass transport supramolecule

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Area of Science:

Materials Science
Nanotechnology
Supramolecular Chemistry

Background:

Rhodopsin-based light-responsive nanochannels show promise but suffer from poor stability.
Artificial nanochannels offer a stable, tunable platform for studying light-induced functions.
Photo-switches like azobenzene and spiropyran enable light-induced wettability changes in nanochannels.

Purpose of the Study:

To review the design and application of photoresponsive host-guest assembled nanochannel systems.
To explore the potential of these systems for controlled molecular transport and release.
To identify research prospects and challenges in the field of photoresponsive nanochannel membranes.

Main Methods:

Incorporation of light-responsive molecules (azobenzene, spiropyran, retinal) as photo-switches.
Integration of host-guest systems, often involving macrocycles like cyclodextrins and metal-organic frameworks.
Utilizing non-covalent interactions for reversible assembly and functionalization of nanochannels.
Modifying surface charge and wettability to regulate transport properties.

Main Results:

Demonstrated the ability to fine-tune stimulus-responsive properties through host-guest interactions.
Showcased control over recognition and transmission behaviors within nanochannels.
Enabled controlled release of host or guest molecules via light-responsive reversible interactions.
Achieved regulation of ionic and molecular transport by altering nanochannel surface properties.

Conclusions:

Photoresponsive host-guest nanochannels represent a promising biomimetic system with tunable properties.
These systems offer versatile applications in controlled transport and release mechanisms.
Further research is needed to address stability, scalability, and specific application challenges.