Abstract
FERRITIN is the principal iron storage molecule in a wide variety of organisms1. It consists of a hollow protein shell (apoferritin) which can contain up to its own weight of hydrous ferric oxide-phosphate as a microcrystalline micelle. Both the shell and its contents have been observed in electron micrographs2,3. Ferritin and apoferritin crystallise in a number of forms, including a cubic one in which the round molecules are “close-packed”4. The cubic crystals have space group F432 (No. 209), side a = 184A, and contain four molecules per unit cell4. We report here on the electron density map of cubic horse-spleen apoferritin at 6-A resolution which we have obtained using two isomorphous derivatives, formed with parachloro-mercury benzoic acid (PCMB) and uranyl nitrate.
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