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Updated: May 25, 2025

Synthesis of Cationized Magnetoferritin for Ultra-fast Magnetization of Cells
Published on: December 13, 2016
Characterization of the Iron-Sulfur Cluster in the NCOA4 Fragment (383-522) and Its Interaction with Ferritin
Ayush Srivastava1, Maximilian Beyer1, Colby Hladun1
1Department of Chemistry, State University of New York, Potsdam, New York 13676, United States.
Abstract:
Ferritin degradation pathways, particularly NCOA4-mediated ferritinophagy, are crucial for maintaining iron homeostasis. Here, we demonstrate the coexistence of two NCOA4 isoforms, one iron-sulfur cluster-free and one iron-sulfur cluster-bound, in oxygenated cell cultures. Using a combination of spectroscopic and analytical techniques, in vitro characterization of the NCOA4 fragment (383-522), denoted NCOA4-D, revealed a predominance of monomeric species with a relatively stable [2Fe-2S] cluster under normoxic conditions. The results demonstrate distinct interactions between NCOA4-D isoforms and ferritin, underscoring the influence of cellular oxygen and iron concentrations on NCOA4's regulatory functions, pathways, and ferritin's fate. Our findings suggest that different NCOA4-initiated degradation pathways may concurrently occur in cells and highlight the necessity of further exploring the role of the Fe-S cluster in NCOA4 as an iron-sensing mechanism for maintaining cellular iron homeostasis.
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