Ferritin is best known as an iron-storage protein that buffers the labile iron pool, and most research focuses on its iron uptake, release, and cellular iron handling. A smaller but growing literature highlights ferritin’s unusual physical behaviors: formation of magnetically active organelle-like assemblies, chemical interactions beyond the labile iron pool, use as a nanoparticle template, drug loading for chemotherapy, MRI contrast enhancement, and distinctive bulk electrical and magnetic responses. These properties appear inconsistent with ferritin’s canonical storage role. Only recently have measurements resolved the electrical and magnetic properties of single ferritin particles, revealing behaviors that differ markedly from bulk samples. This presentation introduces a pioneering single-particle model of ferritin’s bioelectric and biomagnetic properties that reconciles these anomalies. It also provides an interdisciplinary synthesis linking the model to results across chemistry, solid-state physics, and biology, proposes mechanisms by which single-particle properties may influence cells and cellular systems, and outlines targeted experiments to further test and elucidate ferritin’s unusual physical phenomena.
Christopher Rourk (Sun,) studied this question.