PROTEIN PHOTOELECTRIC CONVERSION ELEMENT, AND TIN-SUBSTITUTED CYTOCHROME C

There are provided a novel protein which has extremely high stability with respect to light irradiation, and is capable of maintaining a photoelectric conversion function for a long time, and a protein photoelectric transducer which uses the protein, and is capable of being stably used for a long time. A tin-substituted horse-heart cytochrome c is obtained by substituting tin for iron as a central metal of a heme of a horse-heart cytochrome c. A tin-substituted bovine-heart cytochrome c is obtained by substituting tin for iron as a central metal of a heme of a bovine-heart cytochrome c. A protein 22 made of the tin-substituted horse-heart cytochrome c or the tin-substituted bovine-heart cytochrome c is immobilized on an electrode 21 to form a protein-immobilized electrode. A protein photoelectric transducer is formed with use of the protein-immobilized electrode.