Abstract
Three kinds of amphiphilic polypeptides, X-poly(sarcosine)-b-(L-Leu-Aib)6 (X = adenine, thymine, glycolic acid), were synthesized and self-assembled in a tris buffer to take on nanotube morphology. The nanotubes were joined together to extend the nanotube length with the addition of trifluoroethanol and heat treatment at 50 °C for 24 h. The length extension rate decreased in the order of adenine > glycolic acid > thymine depending on the N-terminal chromophores. Adenine-adenine interactions between the nanotubes were found to be more prevalent upon joining the nanotubes than adenine-thymine interactions. Further, adenines on the nanotube surface could chelate with Cu(<small>ii</small>) to thermodynamically stabilize the nanotube membrane. AFM imaging in liquid environment revealed that the membrane elasticity of the adenine nanotube was as high as ca. 1 MPa, which is considered to be strengthened as a result of the adenine-adenine interactions.
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