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Related Experiment Video

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Helical Organization of Blood Coagulation Factor VIII on Lipid Nanotubes

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Organic Nanotube with Subnanometer, pH-Responsive Lumen.

Shawn M Darnall¹, Changyi Li², Martha Dunbar³

¹Department of Materials Science & Engineering , University of California, Berkeley , Berkeley , California 94720 , United States.

Journal of the American Chemical Society

|July 3, 2019

Summary

Researchers synthesized Bzim-CP, a cyclic octapeptide, to mimic histidine in synthetic nanotubes. This peptide creates functionalized subnanometer channels with pH-responsive properties for advanced molecular transport studies.

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Area of Science:

Supramolecular chemistry
Nanotechnology
Biomimetic materials

Background:

Synthetic nanotubes often have hydrophobic interiors, limiting functionalization.
Biological channels, like aquaporins, utilize histidine residues for selectivity and pH-responsiveness.
Decorating synthetic channels with polar or responsive groups is a significant challenge.

Purpose of the Study:

To synthesize a novel cyclic octapeptide, Bzim-CP, as a functional mimic of histidine.
To create subnanometer nanotubes with ionizable functionalities in the lumen.
To explore new possibilities for functionalizing porous channels and understanding transport phenomena.

Main Methods:

Synthesis of Bzim-CP, a cyclic octapeptide incorporating a benzimidazole moiety.
Characterization of Bzim-CP's self-assembly into subnanometer nanotubes.
Investigation of the protonation states and lumenal functionalities of the nanotubes.

Main Results:

Successful synthesis of Bzim-CP, a structural and chemical mimic of histidine.
Formation of stable subnanometer nanotubes by Bzim-CP.
Projection of two distinct ionizable functionalities into the nanotube lumen, enabling pH-responsiveness.

Conclusions:

Bzim-CP provides a novel platform for creating functionalized subnanometer porous channels.
The benzimidazole functionality effectively mimics histidine's role in biological systems.
This work advances the design of synthetic channels for controlled molecular transport and sensing.