We demonstrated a protein-based memory device using recombinant Pseudomonas
aeruginosa azurin (azurin), a metalloprotein with a redox property. Azurin was recombined
with a cysteine residue to enhance the stability of the self-assembled protein on the gold
surface. The memory device characteristics, including the “read,”“write,” and “erase”
functions of the self-assembled azurin layer, were well demonstrated with three distinct
electrical states of azurin layers by cyclic voltammetry. The robustness of the protein-based …