Interactions of iron-bound frataxin with ISCU and ferredoxin on the cysteine desulfurase complex leading to Fe-S cluster assembly

Frataxin (FXN) binds one Fe2+; the Fe2+-FXN complex is stabilized by its interaction with the scaffold protein (ISCU) on cysteine desulfurase. Upon the addition of reduced ferredoxin (Red-FDX) and l-cysteine, ferredoxin is oxidized (Ox-FDX), l-cysteine is converted to l-alanine generating sulfur, Fe2+ is oxidized to Fe3+, Fe-S binds to ISCU.68