A Discrete Four‐Stranded β‐Sheet through Catenation of M <sub>2</sub> L <sub>2</sub> Metal–Peptide Rings
Eisuke Tsunekawa, Makoto Fujita, Tomohisa Sawada
Abstract
Abstract Methods for precisely constructing a β‐sheet assembly with number‐defined strands in solution remains quite limited due to its intense aggregation property. Here, we report the precise construction of a four‐stranded anti‐parallel β‐sheet by utilizing a non‐covalent approach. This was achieved by folding and assembly of Ag + and a pentapeptide ( 1 ) with the Ala‐ D 3pa‐Gly‐3pa‐Val (3pa: β‐(3‐pyridyl)‐alanine) sequence, which was designed to form an interlocking Ag 2 ( 1 ) 2 ring through metal cross‐linking of the side chains. NMR analyses and X‐ray crystallographic studies characterized the structure of the discrete β‐sheet assembly as well as the remarkable structural selectivity in terms of strands’ number, orientation and the sheet type.