Differential copper-guided architectures of amyloid β peptidomimetics modulate oxidation states and catalysis

Abstract

Orchestration of differential architectures of designer peptidomimetics that modulate metal oxidation states to perform multiple chemical transformations remains a challenge. Cu-chelation and self-assembly properties of amyloid β (Aβ14-23) peptide were tuned by the incorporation of cyclic dipeptide (CDP) and pyrene (Py) as the assembly directing and reporting units, respectively. We explore the molecular architectonics of Aβ14-23 derived peptidomimetics (Akd^NMCPy) to form differential architectures that stabilize distinct Cu oxidation states. The fibrillar self-assembly of Akd^NMCPy is modulated to form nanosheets by the one-off addition of Cu^II. Notably, the serial addition of Cu^II resulted in the formation of micelle-like core–shell architectures. The micelle-like and nanosheet architectures were found to differentially stabilize Cu^II and Cu^I states and catalyze tandem oxidative-hydrolysis and alkyne–azide cycloaddition reactions, respectively.