Construction of a chemically and conformationally self-replicating system of amyloid-like fibrils

Abstract

The amyloid-like fibril is considered to be a macromolecular self-assemblage with a highly-ordered quaternary structure, in which numerous β-stranded polypeptide chains align regularly. Therefore, this kind of fibril has the potential to be engineered into proteinaceous materials, although conformational alteration of proteins from their native form to the amyloid form is a misfolding and undesirable process related to amyloid diseases. In this study, we have attempted to design an artificial system to explore applicability of using the amyloid-like fibril as a construct possessing self-recognition and self-catalytic abilities. A peptide self-replicating system based on the β-structure of the amyloid-like fibril was designed and constructed. The β-stranded peptide was self-replicated by the native chemical ligation reaction, and the newly generated peptide was self-assembled into amyloid-like fibrils. Thus, the constructed system was of both chemical and conformational self-replicating fibrils.