Supramolecular protein polymers: When a heme moiety was introduced to the surface of an apo-cytochrome b562(H63C) mutant, supramolecular polymers formed through noncovalent heme–heme pocket interactions. The incorporation of a heme triad as a pivot molecule in the protein polymer further led to a two-dimensional protein network structure, which was visualized by tapping-mode atomic force microscopy (see picture).
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