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(A) Structural elements and sequence of the natural T4Ff, and proposed structure of the (βAlaBpy)2-T4Ff helicate at the N-terminus of the T4Ff scaffold. The three chains of the T4Ff are shown with different colors (orange, blue, light gray) for clarity. The ΛΛ- chirality is induced by the natural twisting of the T4Ff N-terminal polyproline helices. (B) Synthetic procedure for obtaining the T4Ff helicates, and structure of the chelating Fmoc-βAlaBpy-OH amino acid.
