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Selective nanoscale positioning of ferritin and nanoparticles by means of target-specific peptides.

Many researchers and scientists have recently been intrigued by nanoparticles (NPs) because their immense surface-to-volume ratio bestows on them unprecedented, sophisticated, and useful properties that cannot be attained by bulk materials. Numerous methods of producing NPs have been studied, ranging from the physical to the chemical and the biological. NP synthesis in the cavity of cage-shaped proteins has recently received a great deal of attention because the size of the protein cavity is reproducibly identical and NPs synthesized and fully developed in these spatially confined chemical reaction chambers should also be of the same size. Of the many kinds of cage-shaped protein molecules, the most studied has been ferritin. Ferritin is a ubiquitous iron-storage protein and has a spherical hollow shell (apoferritin) composed of 24 subunits and a ferrihydrite core. [1,2] The outer and inner diameters of the ferritin protein shell are approximately 12 nm and 7 nm, respectively, and many kinds of inorganic NPs, including Co3O4, [3,4]