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Mammalian iron-sulfur cluster biogenesis: Recent insights into the roles of frataxin, acyl carrier protein and ATPase-mediated transfer to recipient proteins.

The recently solved crystal structures of the human cysteine desulfurase NFS1, in complex with the LYR protein ISD11, the acyl carrier protein ACP, and the main scaffold ISCU, have shed light on the molecular interactions that govern initial cluster assembly on ISCU. In this review, the authors aim to highlight recent insights into iron-sulfur (Fe-S) cluster (ISC) biogenesis in mammalian cells that have arisen from the crystal structures of the core ISC assembly complex. The authors will also discuss how ISCs are delivered to recipient proteins and the challenges that remain in dissecting the pathways that deliver clusters to numerous Fe-S recipient proteins in both the mitochondrial matrix and cytosolic compartments of mammalian cells.

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