A novel C3 symmetric peptide:conjugate "Wheel-FKFE" consisting of three β-sheet-forming peptides with wheel-like arrangement is developed, and the morphology of self-assembled peptide conjugates in aqueous solutions is observed at various pH. The CD spectra of Wheel-FKFE show the formation of β-sheet structures in pH 6.9 phosphate buffer, whereas random structures are formed in aqueous HCI (pH 3.3) and NaOH (pH 11) solutions. In transmission electron microscopy, nanofibers with a uniform width of 3-4 nm and lengths of several micrometers are observed in pH 6.9 phosphate buffer, whereas nanorods with the width of several nanometers and the length of several tens of nanometers; are observed for that of aqueous HCI (pH 3.3) and NaOH (pH 11) solutions. The uniform width (3-4 nm) of the fibers observed in neutral solution indicates formation of columnar self-assembly of Wheel-FKFEs. The fluorescence spectrum of polarity sensitive dye, sodium 8-anilino-l-naphthalenesulfonate (ANS), in the presence of Wbeel-FKFE fibers revealed that the polarity inside the fibers corresponds to that of acetone, indicating that the internal space of the fibers possesses medium hydrophobic environment.
All Science Journal Classification (ASJC) codes
- Polymers and Plastics
- Materials Chemistry