Peptide Self-Assembled Nanostructures with Distinct Morphologies and Properties Fabricated by Molecular Design.

Six surfactant-like peptides with the same amino acid composition but different primary sequences are designed, including G3 A3 V3 I3 K3 , K3 I3 V3 A3 G3 , I3 V3 A3 G3 K3 , K3 G3 A3 V3 I3 , V3 G3 I3 A3 K3 , and K3 A3 I3 G3 V3 . These peptides form antiparallel β-sheets during self-assembly. Because the constituent residues have different side chain size and hydrophobicity, sequence changes adjust group distribution and hydrophobicity on the two sides of a given β-sheet. This consequently tunes the binding energy of the side-to-side pairing conformations and leads to different self-assembled structures. G3 A3 V3 I3 K3 and K3 I3 V3 A3 G3 form short nanorods with diameters of 8.5 ± 1.0 nm and lengths <150 nm. I3 V3 A3 G3 K3 and K3 G3 A3 V3 I3 form nanosheets with heights of 4.0 ± 0.5 nm and limited lengths and widths. V3 G3 I3 A3 K3 and K3 A3 I3 G3 V3 form long fibrils with diameters of 7.0 ± 1.0 nm and lengths of micrometer scale. These nanostructures exhibit different capacity in encapsulating insoluble hydrophobic drug molecules and delivering them into the cells. The nanosheets of I3 V3 A3 G3 K3 and K3 G3 A3 V3 I3 can encapsulate both nile red and doxorubicin molecules to an extent of up to 17-23% in mole ratio. Moreover, the shape and size of the nanostructures affect the drug delivery into cells greatly, with the nanosheets and short rods exhibiting higher efficiency than the long fibrils. The study provides new insights into programmed peptide self-assembly toward specific functionalities.