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A hydrophilic cyclic tetra‐β‐peptide having guanine at the side chain (CPG) was synthesized to construct a four‐peptide‐nanotube bundle with the formation of guanine quadruplex (G‐quartet). CPG was so soluble in water that molecular association of CPG was very limited in water. However, in the presence of potassium ion, circular dichroism spectral change showed initial molecular association due to...
A cyclic tetra‐β‐peptide composed of three β‐alanine residues and a L‐β‐homolysine residue having 10,12‐pentacosadiynoic amide at the side chain was synthesized. The cyclic tetra‐β‐peptide formed peptide nanotubes in CDCl3. The diacetylene units along the peptide nanotubes were polymerized by UV irradiation to obtain peptide nanotubes with polydiacetylene along the nanotube. TEM and AFM observations...
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