Abstract
We developed a multi-functional biomemory device composed of cytochrome c and recombinant azurins which have different metal ions in the core. Azurin, one of the well-known metalloproteins, was modified by attaching cysteine residue containing thiol functional group for direct immobilization without chemical linkers. The immobilization of metalloproteins was confirmed by atomic force microscopy (AFM) and surface plasmon resonance (SPR) spectroscopy. The redox properties of immobilized recombinant azurin were validated with cyclic voltammetry (CV), and memory functions using various metalloprotein structures were confirmed by the technique of open circuit potential amperometry (OCPA). We achieved various practical functions based on basic memory functions including write, erase, and read using recombinant azurin and other metalloproteins, and this proposed multifunctional biodevice could be directly applied to the realization of bioelectronics device for next generation, such as single molecular functional device, bioprocessor and biocomputing system.
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