cyclic peptide nanotubes designed to interact with phospholipid bilayers - collagen-pro-peptide-protein designed to interact with phospholipid bilayers Cyclic Peptide Nanotubes: Self-Assembly, Properties, and Emerging Applications

collagen-powder-peptides Cyclic peptide nanotubes (cPNTs) represent a fascinating class of self-assembled supramolecular structures with significant potential across various scientific disciplines. These tubular nanomaterials are formed by the spontaneous stacking of cyclic peptide monomers, driven by specific intermolecular interactions, most notably backbone-to-backbone hydrogen bonding. The inherent ability of cyclic peptides to self-assemble into ordered, hollow structures makes them powerful building blocks for creating functional nanomaterials. Research into cPNTs is rapidly advancing, highlighting their versatility as drug delivery vectors, components in electronic devices, and synthetic channels作者：R Chapman·2012·被引用次数：336—β-Sheet formingself assembling cyclic peptidesoffer a versatile scaffold for the construction and control of hydrogen-bonded nanotube assemblies..

The Self-Assembly of Cyclic Peptide Nanotubes

The formation of cyclic peptide nanotubes is fundamentally a self-assembly process. Cyclic peptides, characterized by their ring-like structure, act as molecular building blocksSelf-assembling organic nanotubes based on a cyclic .... When placed in appropriate conditions, these monomers can aggregate and stack in a highly ordered manner to form extended tubular structures.Membrane-Targeted Self-Assembling Cyclic Peptide ... This self-assembly is often driven by the formation of intermolecular hydrogen bonds between the peptide backbones, leading to a stable, $\beta$-sheet-like arrangement作者：A Blanco-González·2021·被引用次数：6—Self-assembling cyclic peptide nanotubeshave been shown to function as synthetic, integral transmembrane channels..

Several factors can influence the self-assembly process and the resulting nanotube morphology. These include:

* Peptide Sequence and Structure: The specific amino acid sequence and the presence of unnatural amino acids (like $\beta$-amino acids or alternating d,l-$\alpha$-amino acids) play a crucial role in dictating the stability and assembly characteristics of the cyclic peptides. The inclusion of specific functional groups or modifications, such as photoresponsive elements, can introduce dynamic light-driven assembly capabilities.

* Environmental Conditions: Parameters like pH, solvent composition, and concentration can significantly affect the self-assembly pathway and the stability of the formed nanotubesCyclic Peptide Nanotubes. For instance, their behavior in deep eutectic solvents is an area of active investigation.

* Conjugation Strategies: Combining cyclic peptides with polymers can create sophisticated cyclic peptide-polymer conjugate nanotubes. These hybrid structures offer tunable properties and enhanced functionality, particularly for advanced applications like drug delivery.

Diverse Applications of Cyclic Peptide Nanotubes

The unique structural and chemical properties of cyclic peptide nanotubes have paved the way for a wide array of potential applications. Their hollow interior and controllable pore size make them ideal candidates for encapsulation and controlled release systems.

1. Drug and Gene Delivery:

One of the most extensively explored areas for cPNTs is their use as sophisticated drug and gene delivery vectors. Their biocompatibility, coupled with their ability to encapsulate therapeutic payloads, makes them attractive for targeted delivery.

* Antimicrobial and Antiviral Agents: Synthetic antimicrobial cyclic peptides conjugated to drugs have demonstrated efficacy against drug-resistant cancer cells, suggesting a dual therapeutic approachSelf-Assembling Cyclic Peptide Nanotubes for the Delivery of .... cPNTs can be designed to deliver these potent agents directly to target sites.Design and properties of functional nanotubes from the self ...

* Gene Delivery: Their inherent biocompatibility and the ability to control their radius size make cyclic peptide nanotubes promising carriers for gene delivery.Self-assembling organic nanotubes based on a cyclic ... They can protect genetic material from degradation and facilitate its entry into cells.

* Controlled Release: The dynamic nature of some self-assembling cyclic peptides allows for the creation of pH-responsive or light-responsive nanotubes, enabling precise control over the release of encapsulated drugs.

2. Biomimetic Channels and Electronic Devices:

The tubular structure and the ability to form transmembrane channels mimic natural biological pores, opening avenues for biomimetic applications.

* Synthetic Transmembrane Channels: cPNTs composed of $\alpha$-amino acids and cyclic $\delta$-amino acids have shown the ability to function as synthetic, integral transmembrane channels, mimicking the function of natural ion channels in cell membranes.

* Ionic and Molecular Transport: Their well-defined lumen allows for selective transport of ions and small molecules, making them valuable for developing advanced separation technologies and biosensors作者：WH Hsieh·2019·被引用次数：53—Application in antiviral/antibacterial drugs, drug/gene delivery vectors, electronic devices, and ionic/molecular channels..

* Electronic Components: The ordered stacking of cyclic peptides can lead to materials with interesting electronic properties, suggesting potential uses in organic electronic devices.

3. Materials Science:

Beyond delivery and biomimicry, cPNTs are finding roles in novel materials development作者：M Zhang·2016·被引用次数：12—Cyclic peptide nanotubes(CPNTs), constructed by stacking flat, ring-shaped cyclic peptide (CP) subunits through an antiparallel, β-sheet ....

* Scaffolds for Nanostructures: The self-assembling nature of cyclic peptides offers a versatile scaffold for constructing and controlling hydrogen-bonded nanotube assemblies, leading to new nanoscale materials.

* Interface Engineering: cPNTs can form crystalline structures at interfaces, such as the air-water interface, which can be leveraged for surface functionalization and the development of novel composite materials.作者：R Moral·2025·被引用次数：1—Cyclic peptide nanotubes (CPNTs) hold significant promise as nanostructures for drug delivery and materials science, yet their stability in ...

Future Directions and Challenges

While the potential of cyclic peptide nanotubes is immense, several challenges remain. Ensuring long-term stability in diverse biological environments and scaling up synthesis for practical applications are key areas of ongoing research. Further investigation into the precise mechanisms of self-assembly, structure-property relationships, and in vivo behavior will be crucial for translating these promising nanomaterials from the laboratory to real-world applicationsDifferent transport behaviors of NH4 + and NH3 in .... The development of increasingly sophisticated designs, such as Janus cyclic peptide-polymer nanotubes with dual functionality, points towards a future where cPNTs will play an even more significant role in medicine, materials science, and beyondInvestigating the dynamic nature of supramolecular cyclic ....