Multivalent peptide constructs used in preparing HDL-like peptide-lipid nanoparticles. (a) Schematic illustrations of the multivalent peptide constructs, which contain 2–4 copies of amphiphilic helical peptide ligated at the peptide N-terminus to small scaffolds via native chemical ligation. This study involves two series of constructs that differ in the length of the peptide subunit. (b) Helical-wheel diagrams for the peptide subunits used in this study, illustrating their amphiphilic nature. Color-coding in the helical wheels: yellow, hydrophobic; blue, cationic; red, anionic; green, polar uncharged.