Abstract
The naturally occurring iron storage protein, ferritin, has been recognized as an important template for preparing inorganic nanomaterials by fixation of metal ions and metal complexes into the cage. Such ferritin-based biomaterials find applications in various fields like bioimaging, drug delivery, catalysis, and biotechnology. The unique structural features with exceptional stability at high temperature up to ca. 100°C and a wide pH range of 2-11 enable to design the ferritin cage for such interesting applications. Infiltration of metals into ferritin is one of the key steps for preparing ferritin-based inorganic bionanomaterials. Metal-immobilized ferritin cage can be directly utilized for applications or act as a precursor for synthesizing monodisperse and water-soluble nanoparticles. Considering this, herein, we have described a general protocol on how to immobilize metal into a ferritin cage and crystallize the metal composite for structure determination.
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